Best Smartwatch Under £100 UK
Budget smartwatches in the UK have reached a point where sub-£100 models genuinely track heart rate, sleep and workouts with reasonable accuracy. The main trade-off is app ecosystem depth rather than hardware quality, and for most people that's a perfectly acceptable compromise.
What to Look For
- 1Decide between a full smartwatch (apps, notifications, replies) and a fitness band (health tracking focus, longer battery) — both exist under £100.
- 2Battery life varies hugely — Amazfit and Xiaomi models last 1-2 weeks, while Samsung and Apple alternatives rarely exceed 2 days at this price.
- 3Check phone compatibility — some features only work fully with Android or iOS, not both.
- 4GPS accuracy matters if you run or cycle outdoors — built-in GPS is more reliable than connected GPS via your phone.
- 5Water resistance of 5 ATM (50m) is standard at this price and fine for swimming — check before buying if you plan pool sessions.
Our Top Picks
Amazfit GTS 4 Mini
Pros
- Built-in GPS with 5-satellite positioning
- Bright 1.65-inch AMOLED always-on display
- Up to 15 days battery life
- 120+ sport modes with auto-detection
Cons
- No microphone or speaker for calls
- Third-party app support is limited
Best overall under £100 — packed with features including GPS, SpO2 and a vibrant AMOLED display with 15-day battery.
Samsung Galaxy Fit3
Pros
- Large 1.6-inch AMOLED display with great visibility
- Samsung Health app is comprehensive and well-designed
- Up to 13 days battery life
- IP68 + 5 ATM water resistance
Cons
- No built-in GPS — uses connected GPS via phone
- Best features require a Samsung phone
Samsung's best budget fitness tracker with a large AMOLED screen and seamless Galaxy phone integration.
Xiaomi Band 8 Pro
Pros
- Built-in GPS for accurate outdoor tracking
- 1.74-inch AMOLED display is large for a band
- 14-day battery life in typical use
- Over 150 sport modes
Cons
- Plastic build feels less premium
- Xiaomi's Mi Fitness app is basic compared to Samsung Health
Incredible value with a large display, built-in GPS and 14-day battery at a fraction of flagship prices.
Garmin Venu Sq 2
Pros
- Garmin Connect is the gold standard for fitness analytics
- Built-in GPS with Garmin's proven accuracy
- Body Battery energy monitoring is genuinely useful
- AMOLED display with always-on option
Cons
- Battery drops to 3-4 days with always-on display
- No music storage on the base model
Garmin's cheapest AMOLED smartwatch brings serious fitness tracking credibility to the sub-£100 bracket.
Huawei Band 9
Pros
- Very slim and light — barely noticeable on the wrist
- Excellent sleep tracking with TruSleep 4.0
- Up to 14 days battery life
- Quick-release strap system for easy swaps
Cons
- No built-in GPS
- Huawei Health app requires sideloading on some Android phones
Slim, lightweight and comfortable enough to wear 24/7 with solid sleep tracking and a 2-week battery.
Editor's Note
The Amazfit GTS 4 Mini and Samsung Galaxy Fit3 dominate the under-£100 UK market for good reason — both deliver accurate tracking without needing daily charging. Argos, Currys and Amazon UK are the main stockists, and prices typically drop 15-20% around Black Friday. If you want the full smartwatch experience closest to an Apple Watch, the Samsung Galaxy Watch FE is worth stretching to if it drops under £100 on sale.