Pixel Watch gets the features for free

Google announced today that Health Guardian is rolling out in the Google Health app. Pixel Watch 3, Pixel Watch 4 and Pixel Watch 5 owners can begin setting up Blood Pressure Trends, Insulin Resistance Trends and Sleep Breathing Quality this week.

The first proper trend reports will not appear immediately. Google says they should begin arriving in early October, once there is enough data to work with.

Blood Pressure Trends requires at least five consecutive days of data during a week, while Insulin Resistance Trends needs at least seven days of data. The reports are then delivered at the beginning of each month. So these are not daily or real-time measurements.

We already had a pretty good idea the rollout was close. Last week, our Google Health APK teardown found Blood Pressure Trends, Insulin Resistance Trends and Sleep Breathing Quality wired into the app, complete with onboarding screens and places for the resulting data.

Fitbit Air gets a different deal

The odd part is Fitbit Air.

Google says Fitbit Air users will get Blood Pressure Trends and Insulin Resistance Trends later this year, but only with a Google Health Premium subscription. There is no equivalent subscription requirement attached to those features on Pixel Watch 3, 4 or 5.

Google Health Premium costs $9.99 per month or $99 per year, although Fitbit Air buyers receive three months with the device. It is also included with Google AI Pro and Ultra subscriptions, something we covered when Google bundled Health Premium into its AI plans.

That softens the subscription issue for anyone already paying for Google’s AI services. But for everyone else, there is now a fairly clear distinction between what the $99 Fitbit Air gets for free and what Pixel Watch owners receive.

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The patent was published on September 17 and describes a miniaturized impedance plethysmography sensor (IPG sensor), built into a computing device. The drawings make the wearable angle pretty obvious too. One example is a smartwatch, while others show small finger-worn devices and even other types of electronics.

Your fingertip becomes part of the sensor

The basic idea is quite neat. Google places a set of miniature electrodes underneath the fingertip, with two used to send a tiny electrical excitation signal through the tissue and another two used to measure the resulting electrical response.

Blood flowing through the finger changes its electrical impedance. By tracking those changes, the system can produce a pulsatile waveform that reflects the blood pulse, and Google says that signal can then be used to determine blood pressure or a proxy for blood pressure. The patent’s process diagram boils the whole thing down to generating IPG data, deriving the pulsatile signal and then estimating blood pressure from it. 

And Google clearly has smartwatch use in mind. Figure 6A shows the system incorporated into a watch worn on the wrist, with the sensing area positioned on the watch body where a finger could be placed against it. Earbuds are another option. As well as smartphones.

That’s not the only idea

And this is not even the only recent Google patent dealing with the problem. A separate application published last month describes a small finger cuff containing an inflatable bladder, multiple pressure sensors and optical sensors. 

That system would inflate around the finger while an array of barometric sensors maps pressure around the digital artery. But as you can see from the image below, it’s not exactly a discreet smart ring.

Optical sensors simultaneously measure the pulse, and the device combines those signals to calculate blood pressure. The patent’s flow diagram specifically shows inflation, pressure mapping, optical measurements and the final blood pressure estimate as parts of the process. 

Where this fits with Google’s plans

It is worth noting that neither patent names a Pixel Watch or Fitbit product. Google has been busy around blood pressure lately, though. It ran a Fitbit Hypertension Lab study with Pixel Watch 3 owners last November, and Blood Pressure Trends is coming to the Pixel watches this fall as part of Health Guardian.

We also covered an earlier Fitbit patent that hinted at blood pressure checks from the wrist in April. Put the two finger filings next to that and Google is clearly working on blood pressure from several directions. Patents do not confirm a release though, so treat these as a look at what Google is exploring.

Source USPTO: September patent, August patent

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That matters more now because these scores are popping up everywhere. Garmin, Oura, Whoop and Fitbit already have their own versions, and Apple has now joined them with Readiness on the Apple Watch Series 12 and Ultra 4.

The basic idea sounds sensible enough. Your wearable looks at HRV, resting heart rate, sleep and recent activity, then boils everything down to a number telling you whether to push harder, take it easy or have a rest.

The final score is the weak link

Topol was not questioning whether wearables can measure heart rate, sleep or HRV. He wanted to know whether the final readiness score can actually tell someone what to do next.

If Apple says “Recover” or Garmin reports low Training Readiness, does ignoring that advice lead to a worse workout, slower recovery or a greater risk of injury? Topol could find almost no published research testing those recommendations against real outcomes.

A 2025 review of 14 wearable health scores reached a similar conclusion. Most scores used HRV, resting heart rate, sleep and activity, but few manufacturers had published evidence validating the final number produced from that data.

The strongest example Topol found was a Whoop study involving 389 professional golfers. Players performed around half a stroke better when their Recovery score was 10 points higher, but the study had no control group and could only show an association.

That is the missing piece. Wearables can detect changes in the body, but companies have not yet shown that their scores consistently turn those changes into the right advice.

Your wearable may not be measuring HRV in the clinical sense

The HRV figure used by most readiness scores does not come from an ECG. Watches and smart rings use an optical sensor to track the timing of pulse waves at the skin, producing a closely related measurement called pulse-rate variability.

That distinction does not make the reading useless. Optical measurements can match ECG-derived HRV reasonably well while someone rests or sleeps, but the agreement becomes less reliable when movement, sensor fit, circulation or certain health conditions affect the pulse signal.

The research connecting low HRV with poorer health outcomes mainly uses ECG measurements. We cannot automatically apply those findings to short-term changes recorded by a consumer wearable.

HRV is also affected by exercise, alcohol, illness, stress, sleep and many other factors. A lower reading may show that something has changed, but it cannot tell the wearable what caused that change.

Useful signal or daily instruction

None of this means you should ignore readiness scores. A falling score can draw attention to a combination of poor sleep, higher resting heart rate and lower HRV, particularly when the pattern continues for several days.

The problem is the precision implied by the final number. An Oura score of 80 does not have the same meaning as 80 from another platform, and neither score follows a recognised clinical standard.

Readiness scores therefore make the most sense as personal trend indicators. Several unusual days from the same device deserve more attention than one low score after a poor night, late meal or unusually hard workout.

The sensors may have detected a genuine change in your body. The part that remains uncertain is whether the wearable knows exactly what you should do about it.

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The device was first spotted in an FCC filing, where the paperwork pointed to a gadget with straps, a screen, GNSS and Bluetooth LE. The FCC never actually named Google, though. The new IMDA entry does, which makes the whole thing a lot less speculative.

IMDA actually names Google

The Singapore listing is pretty straightforward. G8BL6 appears under the Google brand, with “Wireless Device” as the equipment description and Bluetooth as the equipment type. Wideminds Pte. Ltd. is listed as the local supplier, while the marketing-name field is still blank.

That last bit means we still do not know what Google plans to call this thing. But having Google sitting there in the Brand/Trade Name column is a big step forward because the FCC filing itself only names Weifang Goertek Electronics as the applicant.

When we first looked through the FCC paperwork, there were already plenty of reasons to suspect Google. Goertek also handled the FCC filing for Fitbit Air, and G8BL6 follows the sort of model naming Google uses for its hardware.

The IMDA entry now removes that part of the detective work. Whatever G8BL6 eventually turns out to be, it is a Google device.

The FCC clues now make a lot more sense

That makes everything buried in the FCC reports a bit more important.

The paperwork mentions different straps being tested, while the RF exposure testing treats G8BL6 as an extremity device with zero separation. In other words, this looks very much like something intended to sit directly on the wrist.

There also appears to be a display. The device’s regulatory information can be opened from its Home screen by going through Settings > System > Regulatory Information, where the FCC ID appears electronically.

Then there is GNSS. The FCC testing lists both Bluetooth LE and GNSS, which points to onboard satellite positioning rather than a tracker that depends entirely on a connected phone for location.

The test setup also mentions a charging base. And Sporton used ADB, Google’s Android debugging toolkit, to put G8BL6 into engineering modes during testing. None of that proves it runs Wear OS, but it is another clue that fits much better now that IMDA has directly tied the hardware to Google.

So far, there is no Wi-Fi or cellular radio authorization attached to G8BL6. That makes another conventional Pixel Watch look less likely and pushes us back towards some kind of fitness tracker or lighter wrist wearable.

That mystery Google band is back in the conversation

There is an obvious device sitting in the background here.

Google has already shown an unidentified screen-equipped fitness tracker in its own Pixel advertising. We covered the mystery band in August because it does not match Fitbit Air, Fitbit Charge 6 or Pixel Watch 5.

A Fitbit Charge 7 was the obvious possibility, although there was nothing solid connecting that name to the device. Google could just as easily be preparing something new under the Fitbit or Google branding.

Source: IMDA via thetechoutlook

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There is more here than a few feature flags

For Blood Pressure Trends and Insulin Resistance Trends, Google Health already contains dedicated routes, onboarding components and chart handling. There are also separate states for when the app has no trend data to display, including specific messages for no blood pressure trends data and no insulin resistance trends data.

That does not tell us anything new about how the two features work, and Google has already explained that publicly. What it does tell us is that the app is prepared to take users through setup, receive the resulting data and display it once the features become available.

This is particularly relevant for Fitbit Air because so much of the experience happens on the phone rather than the wearable itself. As we noted in our Fitbit Air review, the screenless tracker depends on Google Health much more heavily than a conventional smartwatch.

Sleep Breathing Quality reveals a bit more

Sleep Breathing Quality is where the APK actually gives us some information Google did not spell out in its announcement. The app defines four Sleep Breathing Quality levels, HIGH, MEDIUM, LOW and VERY_LOW.

Google had already said users would get a daily view of how much of their sleep was spent in optimal breathing, followed by a longer-term monthly assessment. It had not explained that the app would also categorise breathing quality using these four levels.

There is also more detail on how Google Health Coach fits in. One piece of text says Coach insights can cover factors ranging from sleeping on your back to having a drink too close to sleep, while another says daily breathing insights can feed into deeper trend analysis and recommendations for better sleep.

That gives us a slightly clearer picture of the feature. Sleep Breathing Quality will not simply drop another number into the Health tab. Google is preparing explanatory and coaching elements around the result as well.

By the end of this month?

The company’s device comparison page lists Blood Pressure Trends, Insulin Resistance Trends and Sleep Breathing Quality for September 2026. The Fitbit Air product page, on the other hand, still says “coming soon”.

Whether Google still plans another app update before launch is impossible to tell from the APK alone. But the user-facing pieces we found do not appear to be waiting for a future build.

APK teardown note

This article is based on an APK teardown. Code found inside an app can reveal features or devices that are under development, but there is no guarantee they will appear in a future public release.

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The FCC filing showed up on September 10 under FCC ID SZGG8BL6. It does not actually say Google anywhere, and there is no product name, but once you start digging through the test documents, there are quite a few clues about what this thing might be.

The FCC paperwork gives away quite a lot

The applicant is Weifang Goertek Electronics, and G8BL6 is described only as a “Wireless Device”. Not very helpful. The test paperwork, though, gives away quite a bit more.

One report mentions that different straps were tested. Another checks the device under a zero-distance extremity condition. That makes a wrist-worn device the obvious conclusion.

There also seems to be a screen. The FCC e-label can be opened directly on the device through Settings > System > Regulatory Information. That is interesting because Pixel Watch uses the same menu path, while Charge 6 puts regulatory information somewhere else, under Settings > Device Info > Regulatory Info.

The radio setup gives us another clue. G8BL6 supports Bluetooth LE and GNSS, so it appears to have its own satellite positioning rather than relying completely on a phone for location. For now, the FCC authorization only shows Bluetooth LE in the 2.4 GHz band, with no Wi-Fi or cellular listed, which makes it look much simpler than a Pixel Watch.

There is also a charging base in the test setup. ADB version 1.0.39 was used to put the device into engineering modes during testing. This is part of the Android debugging toolkit, so that is another small Google-shaped clue, although it is nowhere near enough to say this runs Wear OS.

The Fitbit Air connection is hard to ignore

Goertek is the other reason this filing stands out. Google’s own regulatory documentation identifies Fitbit Air as model GW9C8 with FCC ID SZGGW9C8, which uses the same SZG grantee code as the new G8BL6 filing.

That does not automatically make G8BL6 another Fitbit. Goertek makes hardware for multiple companies, and nothing in this new filing explicitly identifies Google as the customer. Still, the combination of the Gxxxxx model format, wrist straps, Google-like Settings menu, GNSS and ADB makes this a likely candidate.

It also brings us straight back to the mystery tracker Google showed in its own Pixel advertising last month. That device did not match Fitbit Air, Pixel Watch 5 or any current Fitbit. It had a narrow rectangular display and looked much more like a conventional fitness band.

G8BL6 now gives that idea some actual hardware evidence. We still cannot say the FCC device and the tracker in Google’s ads are the same product, but a screen-equipped wrist wearable with GNSS appearing through the same FCC grantee used for Fitbit Air certainly gives us a much better candidate than we had before.

Charge 7 is the obvious name to throw at it, but that is still a guess. Google has not identified G8BL6, and nothing in the FCC documents contains the Fitbit or Charge names.

There is probably more hiding in the FCC paperwork. The manual and device photos are being kept private until March 9, 2027, so there is a good chance the device will launch before then.

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Pikachu is doing most of the hardware work here

The new version is essentially the regular Fitbit Air dressed for Pokémon’s 30th anniversary. Google has given it a blue micro-adjustable band with a silk-printed sleeping Pikachu and Pokémon Sleep logo, while the tiny tracker that slots inside remains the same Air that launched earlier this year.

That means the same screenless design, lightweight construction, sleep tracking and health sensors. If you want a deeper look at what the device is actually like to use, I’ve been wearing one for some time and covered that in my full Fitbit Air review.

The price does change. The Pokémon Sleep edition costs $129.99 in the US, around $30 more than the standard $99.99 Fitbit Air, and shipping starts September 15. Availability is also fairly limited, with Google confirming that the special-edition band is only being offered in the US and Japan.

You also get three months of Google Health Premium, although that is not exclusive to this particular design. Google included the same three-month trial when it launched the original Fitbit Air earlier this year.

The Pokémon Sleep integration is more interesting

The strap will probably get most of the attention, but the software side is arguably the more useful part of today’s news. Pokémon Sleep can now pull sleep information from Google Health through Health Connect on Android and Apple Health on iOS, with Google saying the experience works across its Pixel Watch and Fitbit wearable range.

That means the Pokémon version of Fitbit Air does not have some exclusive connection to the game. A regular Fitbit Air can do the same thing, as can compatible older Fitbit devices and Pixel Watches.

Once connected, the game uses sleep duration and sleep-stage information from the app. Your sleep contributes to the game’s Sleep Score and Drowsy Power, which in turn influences which Pokémon and sleep styles appear when you wake up.

It is actually quite a natural fit for Fitbit Air. Sleep is already one of the stronger parts of the device, partly because the tracker is so small and there is no display glowing on your wrist at night.

Existing Fitbit Air owners may be less impressed

There is one fairly obvious problem with Google’s approach. If you already own Fitbit Air and just want the Pikachu strap, Google is not currently selling it separately.

That has already become the main complaint among Fitbit owners discussing the launch on social media. Several existing Air users said they liked the new band but had little interest in buying another complete tracker simply to get it, while others questioned why Google was restricting the edition to the US and Japan.

Fitbit Air*

Order now

It is a particularly odd restriction because Fitbit Air was designed around interchangeable bands. The tracker itself pops out of the strap, so selling special-edition straps separately would seem like an easy way for Google to keep the device fresh without expecting existing owners to buy another Air.

Google did something similar with the Stephen Curry Special Edition, so this does appear to be deliberate rather than an oversight. Still, accessories feel like the obvious place for Fitbit Air to have a bit of fun with collaborations, colours and limited editions.

There is nothing technically new about this Fitbit Air. You are paying an extra $30 for the Pokémon design rather than better sensors, new sleep metrics or additional functionality, and anyone buying purely for the hardware would be better served by the regular version.

Source: Google blog

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A fitness tracker with a different purpose

It has only been six months since James Park and Eric Friedman announced their new company called Luffu. But they already have their first piece of hardware ready to go.

So what is it exactly? Well, it looks a bit like another screenless fitness tracker, and there is definitely some of that going on here, but that is only part of the story.

It tracks the usual stuff you would expect. Steps, activity, sleep, heart rate and HRV are all covered, and battery life is up to five days.

There is no screen at all. You basically wear it, let it collect data and get on with your day, rather than constantly checking another little display on your wrist.

It is also water resistant to 50 metres, and you get GPS, Bluetooth and 4G LTE-M built in. The LTE bit is probably where Link starts to become more interesting. It does not need your phone sitting nearby to stay connected, and Luffu is including the cellular service rather than making you sort out another mobile plan.

That also means it can share your location with selected family members. You can probably see where Luffu is going with this, especially if the person wearing it is an older parent or someone you want to be able to check in on occasionally.

There is a button on the band as well, and it does quite a lot. Press it and you can leave a quick voice note about something like taking medication, feeling unwell, eating a meal or just about anything else you want to log.

Those notes then end up in the Luffu app alongside the rest of your health information. The company is also using AI to organise all of that data and try to make some sense of it over time.

The button also doubles as a way of letting people know you are okay. A double press can send a quick check-in to family members, while the help function can send selected contacts your location along with a voice message.

It is worth pointing out that this is not an emergency services button. Pressing it will not call 911, so think of it more as a quick way of reaching family or someone you trust when you need them.

Who is it for?

This is really aimed at families, not people chasing better workout stats. The obvious example is an older parent who still lives independently, but where the rest of the family would like a bit more visibility without constantly checking in.

That is basically the whole idea behind Luffu. Park and Friedman launched the company earlier this year around the idea of pulling health information into one place, learning what is normal for someone and then flagging when something starts to look different.

Link is the wearable that plugs into that. If someone’s activity suddenly drops, their sleep changes or they send a voice note saying they are feeling unwell, family members can potentially see all of that in the same place rather than trying to piece things together from phone calls and messages.

The screenless design makes a lot more sense when you look at it that way. This is not trying to be another smartwatch, and it is not really asking you to interact with it very much at all.

There is a subscription attached

There is one fairly big catch with that $249.99 price. Link is not something you buy once and then forget about, because you also need a Luffu Family Plan.

That costs $19.99 a month or $199.99 a year and covers up to four people. You can have several Link bands running under the same plan, and LTE data is included, so at least you are not also paying a mobile carrier on top.

Still, the subscription changes the whole value equation. After the first year, you are already looking at roughly $450 between the band and the annual plan, which makes this a very different purchase from a normal fitness tracker.

And you cannot actually get one everywhere yet. Luffu is launching Link in the US first, with shipping expected in early 2027, so this is still very much an early-stage product rather than something you can pick up next week.

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A post that appeared on Reddit on Friday shows what looks like a new Google fitness tracker. The poster claims the device is called Pixel Watch AURA, will last for 12 days between charges and is due to launch later this year. The Reddit post has already attracted plenty of attention.

There is a grain of truth behind all of this. Google really has shown an unidentified fitness tracker in its own advertising. But the new AURA image and the specifications attached to it are a different story.

Google’s mystery tracker is real

Earlier this month, an unusual wearable appeared in a couple of Google Pixel 11 ads. It has a small colour display and a shape that sits somewhere between a Fitbit Charge and Pixel Watch.

This wasn’t just one dodgy screenshot circulating on social media. A few users reported seeing the advertisement.

No-one has established what the device actually is. A Fitbit Charge 7 would be the obvious guess, particularly given the long gap since Charge 6. Google could also be planning a new product category alongside the recently launched screenless Fitbit Air.

Now we have this Reddit post which takes the mystery device considerably further. Suddenly there’s a name, Pixel Watch AURA, a claimed 12-day battery life and a launch window later this year. None of those details comes with a source.

And the accompanying image raises even more questions.

We ran the image through three separate AI-image detection tools. They returned probabilities between 97% and 99% that the image was AI generated.

AI detectors aren’t infallible, so that isn’t proof on its own. Compression, image editing and unusual product renders can fool them. But three very high scores become more interesting when the supposed leak has no identified source.

We looked for Pixel Watch AURA in Google’s apps

There is another way to test the claim.

We pulled apart the latest Google Pixel Watch app, version 5.0.0.958206140, looking for references to AURA and unknown wearable hardware. There is no indication of a device called Pixel Watch AURA.

We then checked the latest Google Health app, version 5.06.1, which is the successor to the Fitbit app. Again, no Pixel Watch AURA.

There is actually a standalone AURA entry buried in Google Health. Initially that looked more interesting. Following it through the app shows that it sits alongside symptoms including blurred vision, sensitivity to light, numbness and vertigo. In other words, it refers to migraine aura.

That doesn’t completely rule out the name. Google could keep an unreleased device out of public app builds, use a different internal codename or deliver some configuration from its servers. APK searches are much better at finding evidence than proving something doesn’t exist.

But there is currently nothing in either app backing up the Reddit claim.

The 12-day figure has a similar problem. No source has surfaced for that number either. For comparison, Google officially rates the screenless Fitbit Air for up to a week of battery life. Getting to 12 days from a tracker with an active display certainly isn’t impossible, but right now it is just another unsupported specification attached to the post.

Now make no mistake, Google’s mystery screen-equipped tracker remains genuinely interesting. And there is good reason to think Google has at least experimented with such a device.

Pixel Watch AURA is another matter. Until something more convincing appears, the name, 12-day battery claim and new image look much more like someone building a fictional product around a real Google mystery.

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A Reddit user spotted the wearable. The tracker appears among Pixel phones, Pixel Watch 5 and Pixel Buds, with Google telling buyers to “Make it a matching set.”

There is just one slight problem. Google doesn’t currently sell the fitness tracker shown in the picture.

This doesn’t look like any current Fitbit

The mystery device has a rounded rectangular display sitting inside an equally rounded case. One of Google’s images shows it with a green band and another with a much lighter strap, but the tracker itself looks consistent between the two ads. Its screen also appears to show the time alongside several small circular complications.

That immediately rules out the Fitbit Air. Google’s newest Fitbit is deliberately screenless, with the small sensor pod sitting inside a band and all of the detailed interaction taking place through the Google Health app.

It doesn’t look much like the Fitbit Charge 6 either. The proportions, corner radius and overall shape are different. Inspire 3 is an even less convincing match because its display and body are considerably narrower.

We’ve created a concept image based on these product shots.

Charge 7 is the obvious candidate

We’ve been waiting an awfully long time for a successor to Charge 6. That tracker arrived in 2023, and earlier this year we looked at whether Fitbit Charge 7 could finally arrive. At the time there were no credible leaks, only the increasingly obvious fact that Google’s most capable conventional Fitbit tracker was getting old.

Google has since given Fitbit a fresh start with Air and the new Google Health ecosystem. The company had previously indicated that new Fitbit hardware would arrive in 2026, although Fitbit Air has already fulfilled that promise to some extent.

A redesigned Charge would still make plenty of sense alongside it. Air covers people who want passive, screenless tracking, while Charge 6 remains the better option if you actually want to see workout stats, notifications and other information on your wrist. There is plenty of room in Google’s lineup for both approaches.

The device in these ads also looks much closer to what a modernised Charge could become. The display appears larger and more rounded than Charge 6, but it remains clearly smaller and simpler than the full Pixel Watch 5. That middle ground has always been the Charge series’ natural territory.

There is another possibility. Google could be preparing a cheaper Pixel Watch A-series device rather than another Fitbit. The prominent “Google Pixel” branding around the campaign gives that theory something to work with, although there is currently no solid evidence of an A-series Pixel Watch.

Then there is the less exciting explanation that Google’s marketing team simply created a fictional wearable. AI-generated or heavily manipulated advertising imagery can produce strange hardware. But all the other devices in the images are genuine.

Also, seeing essentially the same unknown tracker in multiple campaign images makes that explanation a little less satisfying. It still doesn’t prove we’re looking at real hardware, since several ads could have been generated from the same source artwork, but this is now worth watching.

For the moment, calling it Fitbit Charge 7 would be premature. What we can say is that Google is advertising the Pixel 11 alongside a screen-equipped wearable that does not appear to match anything it currently sells, and if this was an accidental preview of Google’s next Fitbit, somebody in the advertising department may have pressed publish a little too early.

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