Garmin Forerunner 255 vs Garmin Venu 3
The Verdict
Both Garmin smartwatches excel in fitness tracking, but they serve different priorities. Forerunner 255 features a lightweight design at 49g, MIP display with exceptional 14-day battery life in smartwatch mode, and solid health monitoring including SpO2 and heart rate tracking. Venu 3 upgrades significantly with a vibrant AMOLED display (454 x 454 resolution), ECG capability, skin temperature monitoring, and stainless steel construction, though battery drops to 14 days smartwatch mode and weighs slightly less at 47g. GPS endurance favors Forerunner 255 at 30 hours versus 26 hours. For runners prioritizing battery longevity and proven reliability, Forerunner 255 delivers excellent value. For fitness enthusiasts wanting premium health features and display quality, Venu 3's $100 premium justifies comprehensive ECG, skin temp, and AMOLED screen. Choose Forerunner 255 for endurance athletes; select Venu 3 for complete health insights.
Who Should Buy
Buy the Garmin Forerunner 255 if…
- →14-day battery life means weekly charging at most
- →Multi-band GPS for exceptional outdoor tracking accuracy
- →Morning Report with daily training readiness and HRV status
Buy the Garmin Venu 3 if…
- →Outstanding 14-day battery life with AMOLED display
- →Comprehensive health tracking including ECG and skin temperature
- →Built-in speaker and microphone for calls
Category Scores
Pros & Cons
Garmin Forerunner 255
Pros
- 14-day battery life means weekly charging at most
- Multi-band GPS for exceptional outdoor tracking accuracy
- Morning Report with daily training readiness and HRV status
- Race Predictor estimates finish times for 5K to marathon
- Lightweight at 49 g and comfortable for 24/7 wear
Cons
- MIP display lacks the vibrancy of AMOLED competitors
- No touchscreen on base model — button-only navigation
- No ECG or blood pressure monitoring
- Limited smart features compared to Apple Watch or Wear OS
- Third-party app ecosystem is small
Garmin Venu 3
Pros
- Outstanding 14-day battery life with AMOLED display
- Comprehensive health tracking including ECG and skin temperature
- Built-in speaker and microphone for calls
- Advanced sleep coaching and nap detection
- Multi-band GNSS for accurate GPS tracking
Cons
- No third-party app ecosystem like Wear OS
- Limited smartwatch features compared to Apple/Samsung
- No cellular connectivity option
- Garmin Pay supports limited banks
Full Specifications
| Spec | Garmin Forerunner 255 | Garmin Venu 3 |
|---|---|---|
| Software | Garmin proprietary OS | Garmin OS |
| Body | ||
| Weight | 49 g | 47 g |
| Case material | Fiber-reinforced polymer | Stainless steel bezel, fiber-reinforced polymer case |
| Water resistance | 5ATM | 5 ATM |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 14 days (smartwatch), 30 hrs GPS | Up to 14 days smartwatch mode, 26 hours GPS |
| Display | ||
| Size | 46mm | 1.4 inch |
| Type | MIP (Memory-in-Pixel) transflective | AMOLED |
| Always-on display | ||
| Resolution | 260 x 260 | 454 x 454 |
| Processor | ||
| Chipset | Garmin custom SoC | — |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.0 |
Related Comparisons
This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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