The answer — one pick, priced
Get the
Xiaomi Smart Band 10
$28 under your budget
The cheapest tracker here that is genuinely pool-rated — 5ATM plus a nine-axis sensor with stroke recognition, lap counting and underwater HR sampling the Band 9 never had.
Fit ledger — need → measured evidence
■ The catch — co-equal billing, always
No built-in GPS, and it is a grey import. Outdoor route tracking needs the phone in your pocket, so open-water swims and runs go unmapped. The US listing is a Global Version import: warranty and support run through the Amazon seller, not a US Xiaomi service channel. And wrist optical HR is unreliable submerged on every watch in this bracket — a chest strap is the only honest answer for in-water heart rate.
Dealbreaker? Runner-up №1 adds built-in GPS and keeps the 5ATM rating for $27 more ↓
■ Every product has a catch. Verdicts that hide it are how bad buys happen.
Don't buy this if…
- you need watchOS or Wear OS app ecosystem (Spotify, Google Maps, Uber)Smartwatch verdict →
- you need Apple Watch specifically (iPhone-only ecosystem features)Apple Watch verdict →
- you only want a basic fitness band, not a smartwatchFitness tracker under $200 verdict →
- you want advanced GPS sport watches for running or triathlonGPS running watch verdict →
Wrong product for you is still a bad buy. These are the cases where we'd send you somewhere else.
Runners-up — if your needs differ
Adjacent verdicts — other needs, same method
Different budget, different household, different job — each of these is already researched, priced and verified. Take the one that matches your need.
Traps — this verdict avoids
Why the Xiaomi Smart Band 10 is right for you
It avoids every trap below — and for if you swim, under $80, it is the pick because it delivers:
"IP68 waterproof 50m" is not a swim rating
Two different scales get printed as one number. 5ATM is pool-safe; IP68 is splash and rain only — and CMF explicitly tells you not to swim in its IP68 watches. The TOZO S3 listing says "IP68 waterproof (50m)", which conflates the two. If you swim, the only picks that qualify are the 5ATM ones: Active 2, Bip 6, Bip 5 Unity, Smart Band 10, Redmi Watch 5 Active and the Inspire 3.
"GPS" on the box is usually your phone's GPS
Connected GPS borrows the phone in your pocket; built-in GPS records a route on its own. Four of the nine watches here — Inspire 3, Smart Band 10, Redmi Watch 5 Active and Bip 5 Unity — are connected-GPS only, and leave your run untracked if you go out without the phone. Only the Active 2, Bip 6, CMF Watch 3 Pro and CMF Watch Pro 2 have a real receiver.
The colourway is the SKU
Same watch, different listing, different price. The CMF Watch 3 Pro is $74.92 in Light Grey and about $99 in Dark Grey or Orange — a 32% premium for paint. Case size does the same thing to the Amazfit models: the 44mm and 46mm variants are separate listings. Always check that the price you saw belongs to the colour and size in the cart.
Provenance — 11 sources, dated
Winners are picked from the full research dossier at knowledgelib.io. Prices, stock and listings are re-verified monthly.