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The best fitness trackers and smartwatches under £100 UK shoppers can buy today are mostly slim bands, not full Apple or Samsung watches. We checked Amazon UK on 11 November 2026 and confirmed two new, Amazon-sold trackers still under that cap: the Fitbit Inspire 3 at £84.00 and the Fitbit Charge 6 at £99.99. Both were in stock, and the Charge 6 was Amazon’s Choice.
Cheaper Xiaomi, Huawei and Samsung bands we opened were either out of stock, missing a current Amazon-sold featured price, or sold by a marketplace seller rather than Amazon. Prices were checked on 11 November 2026 and may change, so confirm the live figure, the colour and today’s stock on the retailer page before you buy.
Quick picks: the best fitness trackers and smartwatches under £100 UK
| Best for | Product | Amazon UK price* | Shop |
|---|---|---|---|
| Best slim fitness tracker | Fitbit Inspire 3 | £84.00 | Amazon · eBay |
| Best GPS tracker under £100 | Fitbit Charge 6 | £99.99 | Amazon · eBay |
Google Fitbit Inspire 3, Black/Midnight Zen – £84.00
Best for: Best slim fitness tracker · Amazon UK price: £84.00 · Rating: 4.3/5 (11,707 ratings)
If you want daily steps, heart rate and sleep on a slim band rather than a full smartwatch, the Inspire 3 is the lighter Fitbit we could confirm in stock. Sold by Amazon and in stock at £84.00, it was listed with up to 10 days of battery life, water resistance up to 50 metres, a colour touchscreen and compatibility with iOS 15 or higher and Android 9.0 or higher. Amazon’s bullets cover 24/7 heart rate, a Daily Readiness Score, more than 20 exercise modes, automatic exercise tracking, a stress score, SpO2, irregular heart-rhythm notifications, menstrual health tracking and a daily sleep score with a vibrating smart wake alarm. You also get call, text and app notifications. The box includes small and large classic bands.
The listing includes a six-month Premium membership for deeper insights; after that trial you would need a paid subscription if you want to keep those extras, and core tracking still works without it. Most owners like the light design and multi-day battery, but some reviews mention sync or app problems, a very small 0.7-inch screen, mixed battery life versus the official claim, and units that failed after months. We used the live Amazon-sold price, not a cheaper Amazon Resale offer on the same page. The product table mentions GPS, but the official feature list does not, and some buyers say there is no built-in GPS, so we have not treated this as a GPS running watch.
Fitbit Charge 6, Obsidian/Black Aluminium – £99.99
Best for: Best GPS tracker under £100 · Amazon UK price: £99.99 · Rating: 4.2/5 (5,548 ratings)
The Charge 6 is the step up if you want built-in GPS and Google extras without leaving a £100 budget. It was Amazon’s Choice, sold by Amazon and in stock at £99.99 when we checked. Amazon lists up to seven days of battery life, water resistance up to 50 metres, built-in GPS, more than 40 exercise modes, a Daily Readiness Score, 24/7 heart rate and heart-rate broadcasting to gym equipment over Bluetooth. You can use Google Maps, Google Wallet and YouTube Music controls, plus call, text and app notifications on a colour touchscreen. It is compatible with iOS 15 or higher and Android 9.0 or higher. The box includes the tracker and a charging cable.
This listing includes three months of Google Health membership, described as personalised coaching; confirm the live trial terms on the product page, because they are not the same as the Inspire 3’s six-month Premium offer. Reviewers generally like the brighter screen and GPS for outdoor sessions, but reports are mixed on battery life, phone syncing, long-term reliability and the move from the older Fitbit app to Google Health. A minority mention skin irritation from the strap or problems after swimming, so it is worth checking the return window if either is a concern.
Inspire 3 or Charge 6: which should you buy?
Choose the Inspire 3 if you want a slimmer, lighter band, a lower price and the official 10-day battery claim for everyday steps, sleep and heart rate. It is not the one to buy if you need on-wrist GPS for phone-free runs. Choose the Charge 6 if you will run or walk without carrying a phone map, or if you want Google Wallet, Google Maps and YouTube Music controls. You pay more, the official battery claim drops to seven days, and you still stay under £100 at today’s Amazon-sold price.
Neither of these is a full smartwatch with a cellular connection or a speaker for taking calls on your wrist. Notifications and, on the Charge 6, maps and wallet features still need a compatible phone nearby. Both listings include a time-limited health membership; the Inspire 3 offer is six months of Premium and the Charge 6 offer is three months of Google Health. Check the live terms, and do not assume the extras stay free.
How we chose these fitness trackers and smartwatches
Every product was checked on its Amazon UK page on 11 November 2026 for a live featured price and in-stock status. We only used new items sold by Amazon as leads, stayed at or under £100, and ignored Amazon Resale or marketplace-only offers. We wanted a simple daily band and a more capable GPS tracker, both with a large UK review base.
We dropped a Huawei Band 9 that was in stock but sold by a marketplace seller rather than Amazon, a Xiaomi Smart Band 8 and a Samsung Galaxy Fit3 that were currently unavailable, and a Xiaomi Smart Band 9 Active listing with no current Amazon-sold featured price we could quote. We also ignored used or Resale prices shown under the new Buy Box figures.
Frequently asked questions
Do I need a paid Fitbit or Google Health subscription?
Not for basic steps, heart rate and sleep. Both of these listings include a time-limited membership — six months of Premium on the Inspire 3 and three months of Google Health on the Charge 6 — for extra coaching and insights. After the trial you can keep using the tracker without paying, but some deeper reports may sit behind a subscription. Confirm the live terms on the product page.
Which one has built-in GPS?
The Charge 6 listing includes built-in GPS, so you can record an outdoor run or walk without taking the phone’s location with you. We have not claimed built-in GPS for the Inspire 3, because that is not in the official feature bullets and some buyers say it has none. If GPS matters, the Charge 6 is the safer pick in this pair.
Are they waterproof enough to swim in?
Amazon rates both for water resistance up to 50 metres. That is the official figure for showers and pool sessions, not a promise they will survive every swim or salt-water dip. Some Charge 6 reviews mention problems after swimming, and a fitness tracker is still a consumer gadget, so check the return window if swimming is your main use.
Why are there no Xiaomi or Samsung bands in this list?
Because we could not verify a new, Amazon-sold, in-stock Xiaomi or Samsung tracker with a live featured price under £100 on 11 November 2026. A Huawei Band 9 was for sale, but the seller was a marketplace business rather than Amazon, so we did not use it as a lead. Check those live pages again if you specifically want a cheaper non-Fitbit band.
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