The Apple Watch Series 10 46mm (£424.99) is the best all-around fitness tracker if you own an iPhone, combining robust health monitoring, GPS accuracy, and seamless ecosystem integration. However, the Google Fitbit Charge 6 (£119.95) delivers exceptional value for Android users and iPhone owners seeking a dedicated fitness device without the smartwatch premium. For budget-conscious buyers, the Motorola Moto Watch 40 (£55.59) provides reliable activity tracking and heart rate monitoring at under £60.
Fitness trackers vary wildly in price, from basic activity monitors at £25–£50 to premium smartwatches exceeding £500. Your choice depends on three factors: whether you need GPS, which phone ecosystem you use, and what health metrics matter most (heart rate, blood oxygen, sleep tracking, ECG capability).
Our Top Picks
Apple Watch Series 10 46mm Midnight GPS — £424.99
Best for iPhone users who want a premium all-in-one smartwatch.
The Series 10 combines fitness tracking with full smartwatch functionality. It offers always-on Retina display, cellular connectivity options, ECG app, blood oxygen monitoring, and water resistance to 50 metres. The 46mm case suits larger wrists; 42mm is available for smaller frames. Battery lasts approximately 18 hours with typical use. GPS is accurate for running and cycling routes. The main drawback: works only with iPhone 12 or later.
Google Fitbit Charge 6 Coral/Champagne Gold — £119.95
Best value fitness tracker for serious health monitoring across any phone.
The Fitbit Charge 6 delivers enterprise-grade metrics in a slim band: heart rate zones, SpO2 tracking, EDA sensor (stress detection), menstrual cycle tracking, and sleep staging. 10-day battery life eliminates daily charging. The 1.4-inch AMOLED screen displays workouts and notifications clearly. GPS is built-in for outdoor route mapping. Google Play integration lets you pair with hundreds of third-party apps. No cellular, but wireless syncing is seamless.
Samsung Galaxy Smart Ring Size 7 Titanium Black — £369.49
Best for minimalist wearers who want discreet biometric tracking.
The Galaxy Ring bypasses the watch format entirely. Lightweight titanium band (around 2.6 grams) logs heart rate, SpO2, sleep, stress, and workout data throughout the day without drawing attention. Battery lasts 7 days. Pairs with Galaxy phones, tablets, and the Samsung Health app. No display or GPS on the ring itself — all readouts happen on your phone. Best suited to people who find watches uncomfortable or want invisible daily tracking.
Garmin Venu 4 Fitness Smartwatch — £562.99
Best for triathletes and serious endurance athletes.
The Venu 4 is built for multi-sport training. It includes multi-GNSS (GPS, GLONASS, Galileo) for precise outdoor tracking, running dynamics (cadence, stride length, vertical oscillation), built-in strength training workouts, and recovery metrics. AMOLED display is bright and responsive. Training load tracking tells you if you’re overtraining. Battery reaches 11 days in smartwatch mode. Works with both Android and iOS. Overkill for casual walkers, but essential for marathon runners and triathletes.
Google Fitbit Inspire 3 38mm Black — £84.99
Best entry-level tracker for basic activity and sleep monitoring.
The Inspire 3 is the Fitbit range’s budget anchor. It tracks steps, calories, distance, active minutes, heart rate, and sleep without frills. The 38mm AMOLED screen is bright. GPS requires your phone to be nearby (connected GPS). Battery lasts up to 10 days. No blood oxygen, stress detection, or advanced metrics — pure activity logging. Ideal for someone building a fitness habit on a tight budget.
Motorola Moto Watch 40 — £55.59
Best budget option for runners who need GPS and heart rate data.
At under £56, the Moto Watch 40 packs unexpected features: built-in GPS, heart rate monitor, sleep tracking, and 24-hour activity insights. The 1.4-inch display is readable in sunlight. Battery lasts 7 days on a charge. Works with Android and iOS. No ECG, SpO2, or stress detection, but for casual runners logging weekly 5K loops, it’s excellent value. The watch is slightly chunky compared to premium competitors, but durability is solid.
Noise Colorfit Pro 6 Max Smartwatch — £87.49
Best affordable smartwatch for notifications and workouts combined.
Colorfit Pro 6 Max offers a 1.43-inch AMOLED display, 100+ watch faces, and 150+ sports modes for a sub-£90 price. Heart rate and SpO2 monitoring included. Battery reaches 7 days. Connected GPS uses your phone for route mapping. No cellular or advanced biometrics, but the display quality and build feel premium for the price.
Quick Comparison
| Product | Price | Best For | Standout Feature |
|---|---|---|---|
| Apple Watch Series 10 46mm | £424.99 | iPhone ecosystem, all-in-one | Always-on Retina display, ECG app |
| Google Fitbit Charge 6 | £119.95 | Multi-platform value hunters | 10-day battery, EDA stress sensor |
| Samsung Galaxy Smart Ring | £369.49 | Minimalist, discreet wearers | Invisible biometric tracking, 7-day battery |
| Garmin Venu 4 | £562.99 | Endurance athletes, triathletes | Multi-GNSS, training load metrics |
| Fitbit Inspire 3 | £84.99 | Budget-conscious beginners | Affordable AMOLED entry point |
| Motorola Moto Watch 40 | £55.59 | Budget runners | Built-in GPS under £60 |
| Noise Colorfit Pro 6 Max | £87.49 | Notification seekers on a budget | AMOLED display, 150+ sports modes |
How We Chose
- GPS accuracy and connectivity: We prioritised devices with built-in multi-GNSS (Garmin), dedicated GPS (Apple, Fitbit Charge 6), or connected GPS (Fitbit Inspire 3, Moto Watch 40). GPS matters for runners mapping routes; it’s optional for casual steppers.
- Battery longevity: Devices lasting 7+ days (Samsung Ring, Motorola Moto Watch 40, Fitbit Charge 6) rank higher than daily chargers. Endurance athletes prefer fewer charging days mid-training cycles.
- Health metrics breadth: We assessed heart rate, SpO2, ECG, sleep tracking, and stress detection. Premium models (Apple Series 10, Garmin Venu 4) offer 5–6 metrics; budget options cover 2–3. Match the feature set to your health priorities.
- Price-to-feature ratio: Value leaders like Fitbit Charge 6 (£119.95 for enterprise metrics) and Motorola Moto Watch 40 (£55.59 with GPS) deliver disproportionate capability per pound. Premium models (Apple, Garmin) cost 3–5× more but justify it only for locked-in ecosystems or professional athletes.
The Bottom Line
Buy the Apple Watch Series 10 46mm (£424.99) if you have an iPhone and want a single device handling fitness, payments, and notifications. For everyone else—especially Android users or those wanting dedicated fitness tracking—the Google Fitbit Charge 6 (£119.95) is the best value, pairing 10-day battery life with EDA stress sensing and sleep staging at less than a quarter the Apple price. If your budget is under £60, the Motorola Moto Watch 40 (£55.59) includes built-in GPS and heart rate monitoring that rivals trackers costing twice as much.
Frequently Asked Questions
What are the best fitness trackers under £100?
The Google Fitbit Charge 6 (£119.95) just exceeds £100 but offers unbeatable value with blood oxygen, stress detection (EDA sensor), sleep staging, and 10-day battery. Under £100, the Fitbit Inspire 3 (£84.99) and Noise Colorfit Pro 6 Max (£87.49) both deliver AMOLED screens, heart rate tracking, and reliable sleep monitoring. For pure budget GPS tracking, the Motorola Moto Watch 40 (£55.59) is the standout pick.
Do fitness trackers work with both iPhone and Android?
Most do, with caveats. The Apple Watch only pairs with iPhone 12+. The Samsung Galaxy Smart Ring integrates deeply with Samsung Galaxy phones but works with other Android and iOS devices through Samsung Health app with reduced features. The Google Fitbit Charge 6, Inspire 3, and Motorola Moto Watch 40 work equally well with iPhone and Android phones via their respective apps—this multi-platform compatibility is a major advantage.
Which fitness tracker has the longest battery life?
The Samsung Galaxy Smart Ring (7 days) and Google Fitbit Charge 6 (10 days) lead. The Fitbit Charge 6’s 10-day battery is the longest among traditional wrist-worn trackers. For comparison, the Apple Watch Series 10 lasts ~18 hours, the Garmin Venu 4 reaches 11 days in smartwatch mode, and budget trackers like the Motorola Moto Watch 40 manage 7 days. If you dislike frequent charging, avoid premium smartwatches in favour of dedicated fitness bands or the Galaxy Ring.
What’s the difference between a fitness tracker and a smartwatch?
Fitness trackers (Fitbit Charge 6, Inspire 3, Galaxy Ring) prioritise health metrics—heart rate, SpO2, sleep, stress—with minimal notifications and limited apps. Smartwatches (Apple Series 10, Garmin Venu 4, Motorola Moto Watch 40) add notification alerts, app ecosystems, and sometimes cellular connectivity, at the cost of heavier weight and shorter battery life. Dedicated fitness trackers are lighter, last longer, and focus on what matters most to athletes; smartwatches suit people wanting a wrist computer that also tracks fitness.
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