Disclosure: As an Amazon Associate I earn from qualifying purchases. This guide contains Amazon affiliate links, and we may earn a commission — at no extra cost to you — but it never changes our rankings.
Under £100, the UK smartwatch market delivers more than ever before. You can now get built-in GPS, AMOLED displays, Bluetooth calling, comprehensive sleep and health monitoring, and even a renewed Samsung Galaxy Watch running full Wear OS — all for well under the £100 ceiling. The key choice is between budget fitness trackers with 7–20 day battery life, and Wear OS devices like the Samsung Galaxy Watch 5 that support Google Pay and Google Maps but need charging every 2–4 days. For most UK buyers who want a practical daily smartwatch without Apple Watch prices, the under-£100 bracket is genuinely competitive. All picks here are available on Amazon UK with standard consumer rights protection.
Buying guide
What to look for in Smartwatches Under £100
1Wear OS vs. proprietary OS: Wear OS (Samsung Galaxy Watch) gives you Google Pay, Google Maps, and app downloads. Proprietary OS watches have longer battery but no third-party apps.
2GPS accuracy: Dual-band GPS (L1+L5) is more accurate in UK urban environments with tall buildings. Single-band GPS drifts more in cities like London or Manchester.
3Battery priority: If you want to wear it 24/7 for sleep tracking without charging anxiety, choose a budget tracker with 7+ days. If smart features matter more, accept 2–4 day Samsung battery life.
4Waterproofing: 5ATM is swim-safe; 3ATM handles rain and splashes only; IP68 is similar to 3ATM for daily use.
5Health sensors: All watches here track heart rate, SpO2, and sleep. Budget blood pressure readings are not clinically validated — do not use for medical decisions.
Our process
How we choose our picks
We don’t lab-test products ourselves. Instead we synthesise the strongest independent evidence — current Amazon UK listings, verified-buyer feedback, published specs and UK pricing — into clear, honest recommendations. We earn a commission if you buy through our links, but that never changes which products we rank.
Current UK availability
We only shortlist products actively listed and in stock on Amazon UK, checked against live catalogue data — not last year’s models.
Publicly visible buyer feedback
We look at how each product is received by UK shoppers — its overall rating standing and the praise or complaints that recur in public reviews — rather than relying on a single reviewer’s opinion.
Published specs & value
We compare manufacturer specifications, typical UK price bands, warranty and running costs so each pick is right for a real budget and use-case.
UK-specific fit
We factor in UK voltage, plug/fitting standards, CE/UKCA marking and Consumer Rights Act cover — details that generic global lists miss.
The Samsung Galaxy Watch 5 renewed at £74.95 is the strongest under-£100 pick for Android users who want a proper smartwatch ecosystem. Google Pay on UK contactless terminals, sapphire crystal glass, and Samsung Health make it significantly more capable than any budget tracker at a similar price.
Size
44mm
Screen
Sapphire crystal (1.6x break-resistant)
Sensor
Samsung BioActive (body composition)
Connectivity
Bluetooth, Wear OS
Colour
Graphite
Condition
Renewed
What we like
+Full Wear OS with Google Pay — works at UK contactless terminals
+Sapphire crystal screen — significantly more scratch and break resistant than standard glass
+Samsung BioActive sensor measures body composition
+Established Samsung Health ecosystem with NHS app integration
Worth noting
–Renewed unit — possible light cosmetic marks
–2–4 day battery — needs regular charging unlike budget trackers
£74.95Amazon.co.uk price as of 01 Aug, 14:54 (London time). Details
The Jugeman GPS at £59.99 is the best pure fitness tracker under £100 for UK buyers who prioritise GPS accuracy and battery life over smart features. The dual-band GPS is genuinely impressive for the price — ideal for runners, cyclists and hikers on UK trails and urban routes.
Display
1.43" AMOLED 466x466
Gps
Dual-band L1+L5 (6 satellite systems)
Waterproof
5ATM
Battery
520 mAh, 5–7 days / 20 days standby
Sports Modes
160+
Connectivity
Bluetooth 5.3
Extras
LED flashlight, compass, barometer, altimeter
What we like
+Dual-band GPS — more accurate in London and other UK city centres
+5ATM waterproof — safe for pool swimming
+AMOLED display with 4-level brightness readable in UK summer sun
+20-day standby — goes a week+ between charges
Worth noting
–No Google Pay or Wear OS apps
–No-name brand with unproven long-term reliability
£99.99Amazon.co.uk price as of 01 Aug, 14:54 (London time). Details
The aeac's 5-year guarantee is the standout feature — if anything fails, you're covered well beyond the standard Consumer Rights Act protection. AMOLED display and Bluetooth calling at £54.41 is solid value; the lack of standalone GPS is the main limitation.
Display
1.32" AMOLED
Waterproof
3ATM
Battery
7 days
Sports Modes
110+
Gps
Phone GPS via app
Warranty
5-year seller guarantee
What we like
+5-year seller guarantee — exceptional for this price bracket
+AMOLED at £54.41 — vibrant display for under £55
+Bluetooth calling with AI voice assistant (Siri/Google)
+7-day battery
Worth noting
–No built-in GPS — route tracking requires phone
–3ATM is splash-resistant only, not swim-safe
£54.41Amazon.co.uk price as of 01 Aug, 14:54 (London time). Details
CASCHO Smart Watch for Women — 1.85" HD, 450 mAh, 120+ Sports, IP68
The CASCHO is the best smartwatch under £30 for women who want health tracking plus style. A 12-day battery, rose gold finish, menstrual tracking, and two included straps make it a thoughtful bundle. Siri and Google Assistant support from the wrist adds hands-free utility.
Display
1.85" TFT HD
Waterproof
IP68
Battery
450 mAh, 7–12 days
Sports Modes
120+
Extras
Menstrual tracking, two straps included, Siri/Google Assistant
What we like
+12-day regular-use battery — longest on this list
+Two straps for different wrist sizes included
+Menstrual cycle and stress tracking
+Rose gold colourway — stylish option not common at this price
Worth noting
–IP68 not swim-safe
–Cannot reply to messages from watch — read-only notifications
The IMSVEPR's 2.01-inch screen is the biggest on this list — great for older users or anyone who finds small watch faces hard to read. At £29.06 with built-in GPS, it is exceptional value for walkers and casual runners on UK footpaths who want route recording without carrying a phone.
Display
2.01" TFT HD
Gps
Built-in single-frequency GPS
Waterproof
1ATM
Battery
7 days GPS on / 30 days standby
Sports Modes
110+
What we like
+Largest 2.01" display for easy readability
+Built-in GPS for phone-free route tracking
+30-day standby battery
+Under £30 with GPS
Worth noting
–1ATM only — cannot be worn in rain or splashes
–Single-band GPS less accurate in urban UK areas
£29.06£34.19−15%Amazon.co.uk price as of 01 Aug, 14:54 (London time). Details
At £20.99 the Jugeman 1.96" is the cheapest complete smartwatch on this list with Bluetooth calling and a quality display. The 1.5-hour charge time means even a brief lunch break top-up can extend the day. Solid starter smartwatch for anyone making their first purchase.
Display
1.96" TFT HD 320x385
Waterproof
IP68
Battery
7 days / 30 days standby
Charging
1.5 hours
Sports Modes
113+
Watch Faces
220+
What we like
+1.5-hour fast charge — quickest recharge on this list
+220+ watch faces including custom photo
+IP68 for handwashing and light rain
+Under £21
Worth noting
–No GPS
–300 mAh battery is smallest here
£17.84£29.99−41%Amazon.co.uk price as of 01 Aug, 14:54 (London time). Details
Product prices and availability are accurate as of 01 Aug, 14:54 (London time) and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Editor's Note
UK buyers under £100 face a genuine fork in the road: Wear OS with Google Pay vs. long battery life with superior GPS. The Samsung Galaxy Watch 5 renewed is the only pick here that works with Google Pay at UK contactless terminals — a meaningful practical advantage for commuters using contactless travel on buses and trains. Budget trackers dominate on battery life and GPS accuracy per pound, but they run proprietary apps that are less polished and cannot be extended with third-party apps. For users who primarily want fitness data and long wear time without charging, the Jugeman GPS is a better daily companion than the Samsung at this price. Under the UK Consumer Rights Act 2015, renewed items from Amazon Renewed carry a minimum 1-year guarantee — shorter than the standard 6-month implied warranty on new goods, but still meaningful protection.
Our Take
The UK electronics market moves fast — what was the best buy six months ago may not be today. The Samsung Galaxy Watch 5 44mm — Renewed, UK Version, Sapphire Crystal is our top recommendation — it consistently outperforms alternatives in real-world UK use. If that's out of budget, the Samsung Galaxy Watch 5 44mm — Renewed, UK Version, Sapphire Crystal offers solid performance at a lower price point. The Jugeman GPS Smart Watch — 1.43" AMOLED, Dual-Band GPS, 5ATM, 160+ Sports is worth considering if you want a step up in build quality or features. Avoid the cheapest unbranded options on Amazon UK — they rarely survive past six months of regular use and UK consumer protection only helps if the seller is still trading.
Questions & answers
Frequently asked questions
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. UKPicks earns a small commission from qualifying purchases made via links on this page. This does not affect our editorial recommendations or the price you pay.
