| Fitbit Alta | Fitbit Alta HR | |
 |  | |
| Tech specs | ||
| Size | Width 15mm (Sizes depend on type of band) | Device Dimensions: 15 mm x 10 mm x 35 mm (W x D x L) (Sizes depend on type of band) |
| Material | Stainless steel clasp, Classic band (elastomer), Metal band (stainless steel metal), Leather band (soft, genuine leather) | Wristband is made of a flexible, durable elastomer. The tracker is made with surgical-grade stainless steel, and the buckle is made with aluminum. |
| Charging | USB | USB |
| Battery | Lithium-polymer | Lithium-polymer |
| Battery life | up to 5 days | up to 7 days |
| Water-resistance | Sweat, rain and splash proof. | Sweat, rain and splash proof |
| Weight | 29 grams | 15 grams |
| Sensor | 3-axis accelerometer, Vibration motor | 3-axis accelerometer, Vibration motor, optical heart rate sensor |
| Display | OLED | B&W OLED touchscreen |
| Screen size | 1.4-inch, 128 x 36 pixel resolution | 1.4-inch, 128 x 36 pixel resolution |
| Colors | Classic (Black, Blue, Plum, Peal); Leather (Bluish Pink, Graphite); Metal (Stainless Steel) | Black, Blue/Gray, Coral, Fuchsia |
| Other | ||
| Activity tracking | ||
| Steps | Yes | Yes |
| Distance | Yes | Yes |
| Calories burned | Yes | Yes |
| Activity | Yes | Yes |
| Floors | ||
| Sleep | Yes | Yes |
| Heart rate | 24/7 | |
| Stress & recovery | ||
| Pulse Ox | ||
| Respiration rate | ||
| UV exposure | ||
| Skin temperature | ||
| Galvanic skin response | ||
| Hydration level | ||
| Calorie intake | ||
| GPS | ||
| Running features | ||
| Swimming features | ||
| Other | Clock, auto sleep detection, silent wake alarm, auto exercise recognition. | Clock, auto sleep detection, silent wake alarm, auto exercise recognition. |
| Non-fitness functions | ||
| Smartphone notifications | Yes | Yes |
| On-board music storage | ||
| Connected pay | ||
| LTE | ||
| Links | ||
| Affiliate link* | Amazon | Fitbit | Amazon | Fitbit |
| Read more | Review | Review |
**All tech specs and images on this page come from manufacturers. These may change over time as manufacturers sometimes update their devices. While we cannot guarantee absolute accuracy of information on this page, we promise to review this content regularly and do our best to bring you the most up-to-date information. To be absolutely sure of tech specs of a particular device, we recommend checking the manufacturer’s website.