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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.
In this guide
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 |
The table compares the two Fitbits that made our best fitness trackers and smartwatches under £100 UK list. Both were in stock and sold by Amazon UK when we checked on 11 November 2026.
Our reviews of the best fitness trackers and smartwatches under £100 UK
Below we look at each of our best fitness trackers and smartwatches under £100 UK picks in detail, with the price we saw on 11 November 2026 and the key features from the listing.
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 the best fitness trackers and smartwatches under £100 UK
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.
Which tracker suits you?
- Best slim fitness tracker: Fitbit Inspire 3, £84.00 when we checked.
- Best GPS tracker under £100: Fitbit Charge 6, £99.99 when we checked.
If you want a slim, simple band for steps, sleep and heart rate, the Inspire 3 is the better buy. If you run or cycle outdoors and want built-in GPS, the Charge 6 is worth the extra money. Both are among the best fitness trackers and smartwatches under £100 UK shoppers can buy from a well-known brand.
How to choose the best fitness trackers and smartwatches under £100 UK
The best fitness trackers and smartwatches under £100 UK shoppers buy are the ones they will actually wear every day. These are the points to check before you choose.
Tracker or smartwatch
A fitness tracker is a slim band that focuses on steps, heart rate and sleep, with simple notifications. A smartwatch has a bigger screen and more apps, but usually needs charging more often and costs more. Under £100, trackers usually give better value.
Built-in GPS
Built-in GPS lets the tracker map your runs, walks and rides without your phone. Without it, many trackers can use your phone’s GPS instead, so you need to carry your phone for accurate distance.
Battery life
Most fitness bands last several days on a charge, which means fewer interruptions to sleep tracking. Using GPS or an always-on display drains the battery faster.
Phone compatibility
Check that the tracker’s app works with your phone. Fitbit’s app works with both Android and iPhone, but some features can differ between the two.
Subscriptions
Some brands offer a paid subscription for extra insights and guided workouts. The basic tracking works without it, so check what is included before you pay.
Comfort and size
A tracker only helps if you wear it day and night. Check the band sizes in the box, and consider a softer or breathable strap if you have sensitive skin.
How much activity do you need?
The NHS physical activity guidelines for adults recommend at least 150 minutes of moderate activity a week, such as brisk walking or cycling, plus strength exercises on two or more days. A tracker can make it easier to see whether you are on track.
Fitness trackers are useful for motivation, but they are not medical devices. If your tracker shows readings that worry you, speak to your GP rather than relying on the device alone.
Like any rechargeable gadget, a tracker should be charged with its own cable and a reliable USB plug. Electrical Safety First has simple advice on fitness trackers and smartwatches, including not charging them overnight on a bed.
Used sensibly, the best fitness trackers and smartwatches under £100 UK shops sell are a simple, low-cost way to build healthier habits.
What the best fitness trackers and smartwatches under £100 UK can track
Most of the best fitness trackers and smartwatches under £100 UK shops sell track steps, active minutes, heart rate and sleep. Many also estimate calories burned and show how much time you spent in different heart rate zones during exercise.
Sleep tracking is one of the most popular features. It shows how long you slept and how restless you were, which can help you spot patterns. Treat the figures as a guide rather than an exact measurement.
Some trackers also show breathing rate, skin temperature changes or blood oxygen estimates. These extra readings vary by model and region, so check the listing or the maker’s website for the exact features.
Getting started with your tracker
Once you have charged your tracker, install the app, pair it with your phone and set up your profile. Entering your height, weight and age helps the tracker estimate calories and distance more accurately.
Wear the tracker a finger’s width above your wrist bone, snug but not tight. For exercise, wearing it a little higher up the arm can help the heart rate sensor read more accurately.
Set a daily step or active minutes goal that feels realistic, then increase it slowly. Small, steady changes are easier to keep than big jumps.
Give it a couple of weeks to learn your habits. The best fitness trackers and smartwatches under £100 UK buyers choose become more useful as they collect more data.
The best fitness trackers and smartwatches under £100 UK as gifts
A fitness tracker is a popular Christmas or New Year present for someone who wants to move more. If you are buying as a gift, check that the person has a compatible smartphone, as the app is needed for setup.
If you are not sure of their wrist size, look for a model that comes with both small and large bands in the box. Keep the gift receipt in case they would prefer a different colour.
Looking after your fitness tracker
Clean the band and the back of the tracker regularly with a little water, and dry it well, especially after exercise. This helps prevent skin irritation. Take the tracker off now and then to let your skin breathe.
Install updates in the app when they appear, as they can improve accuracy and add features. With a bit of care, the best fitness trackers and smartwatches under £100 UK buyers own can last for several years.
Pair your tracker with the right kit
A tracker works best as part of a wider routine. If you are getting into running, see our guide to the best running gear and accessories UK. For strength work at home, our list of the best home gym equipment UK covers dumbbells, mats and bands.
Best fitness trackers and smartwatches under £100 UK: 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.
Are the best fitness trackers and smartwatches under £100 UK shops sell accurate?
Step counts and heart rate are generally reliable enough for everyday use, but no wrist tracker is perfect. Readings can vary with fit, skin and movement. Use the data to spot trends over weeks rather than relying on a single number.
Do I need a phone to use a fitness tracker?
You need a smartphone to set up the tracker and view most of your data in the app. Once set up, the tracker records activity on its own and syncs when your phone is nearby.
Can I swim with a fitness tracker?
Many trackers are water resistant enough for swimming, including the Fitbits in our list according to their listings. Check the water resistance rating and the maker’s guidance before you swim with one.
Our verdict on the best fitness trackers and smartwatches under £100 UK
For most people, the Fitbit Inspire 3 is the best value of our best fitness trackers and smartwatches under £100 UK picks, with a slim design and long battery life. If you want built-in GPS for running or cycling, the Fitbit Charge 6 is worth the extra. Prices on the best fitness trackers and smartwatches under £100 UK retailers list change often, so check before you buy.
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