Best Xiaomi Smartwatch 2026: Redmi, Watch & Band Compared

The useful Xiaomi decision is not a universal “best” badge. Watch 2 Pro is the Wear OS option for Android apps; Watch S3 is a round-watch alternative; Redmi Watch 4 emphasizes a large rectangular display; Smart Band 8 Pro narrows the body. This guide compares these four existing catalog-era models, not the whole current Xiaomi range.

Source review: 2026-10-23. This is a documentary comparison, not hands-on testing. We checked the manufacturer pages linked below and selected by phone compatibility, charging needs and practical trade-offs. Battery figures are manufacturer claims, not our measurements; different test modes are not a controlled comparison. These are older catalog models, not a complete ranking of every watch sold in 2026. The original publication date is retained above.

Watch, Redmi or Band: a mobile-friendly comparison

Read each row as phone support → body size → manufacturer battery mode → reason to choose or avoid. Specifications below refer to the global versions. A China-market listing, different regional firmware or LTE variant must not be treated as the same offer.

Xiaomi Watch S3

Phone: Android 8.0 or iOS 12.0 and later through Mi Fitness. Body: 47 × 47 × 12 mm, 44 g without strap. Xiaomi advertises up to 15 days typical use with Android or 14.5 with iOS, and 5 days with always-on display; none is measured by us.

Choose it for a round watch if that wide case fits. Do not choose it specifically for Wear OS apps: the S3 uses Xiaomi HyperOS. Availability of NFC payments and supported cards needs a separate country check.

Xiaomi — Watch S3 specifications

Xiaomi — Watch S3 battery conditions

Xiaomi Watch 2 Pro

Phone: Android 8.0 or later with Google Mobile Services 21.30.12 or later; Android Go and iOS are not supported. Body: 47.6 × 45.9 × 11.8 mm, 54.5 g without strap. Xiaomi rates up to 65 hours for Bluetooth and 55 hours for LTE under its test conditions.

Choose it for Wear OS and Google apps, not for the longest stated endurance. The heavier body and more frequent charging are the practical trade-offs. For LTE, verify the exact version and your carrier’s supported country and plan before paying.

Xiaomi — Watch 2 Pro specifications

Xiaomi Redmi Watch 4

Phone: Mi Fitness for Android or iOS; check the current app requirements. Body: 47.5 × 41.1 × 10.5 mm, 31.5 g without strap; built-in GNSS. Xiaomi claims up to 20 days typical use.

Choose it for readable notifications and a rectangular screen if the price fits. Avoid assuming that Bluetooth calls mean independent cellular calling or that the large screen implies Wear OS app support.

Xiaomi — Redmi Watch 4 specifications

Xiaomi — Redmi Watch 4 battery conditions

Xiaomi Smart Band 8 Pro

Phone: Android 8.0 or iOS 12.0 and later. Body: 46 × 33.35 × 9.99 mm, 22.5 g without strap; built-in GNSS. Xiaomi quotes 14 days typical use or 6 days with always-on display.

Choose the Band when a narrower body matters more than a round-watch appearance. It is not automatically the cheapest listing today, and a lighter body does not establish better sleep or SpO2 accuracy.

Xiaomi — Smart Band 8 Pro specifications

Xiaomi — Smart Band 8 Pro battery conditions and limitations

SpO2: what this comparison does not establish

Xiaomi’s product notes describe these wellness measurements as non-medical. SpO2 is not a diagnosis, and a feature checklist cannot establish accuracy. We have no controlled comparison against a reference instrument for these models and therefore give no clinical accuracy percentage, detection guarantee or “most accurate” ranking. Do not use a watch reading to rule out a health problem.

Xiaomi — Smart Band 8 Pro battery conditions and limitations

Regional availability and price checks

These official global pages establish specifications, not local stock, warranty coverage or a confirmed US offer. Check the model region, app availability, language support, seller and return terms. Payment support and LTE activation are separate checks; “global version” alone does not prove either will work in your country.

We have not verified current prices for this review. Amazon.com listings use USD when presented in US dollars; they are not euro offers. If the budget is $100, accept a model only when the actual delivered total is within that limit. No model here is labelled a guaranteed sub-$100 purchase.

For a US spending cap, use the under-$200 shortlist. The Xiaomi background article covers a different set of models; this page is the compatibility-and-battery comparison for the four named here.

Frequently asked questions

Which Xiaomi here works with an iPhone?

The global Watch S3 and Smart Band 8 Pro specifications list iOS 12.0 or later; Redmi Watch 4 also supports iOS through Mi Fitness. Watch 2 Pro does not support iOS. Also check whether the current companion app can be installed on your particular phone.

Is Watch 2 Pro better than Watch S3?

Only for a different priority: Watch 2 Pro offers Wear OS and Google apps on supported Android phones. Watch S3 has a longer stated typical-use battery figure. The figures use different manufacturer scenarios and do not establish a controlled endurance winner.

Which Xiaomi has the most accurate SpO2 sensor?

This guide cannot establish that. We have not performed a controlled reference-instrument test, and Xiaomi describes these wellness products as non-medical. We do not infer clinical accuracy from the presence of an SpO2 feature.

Which model should I buy under $100?

Check Redmi Watch 4 and Smart Band 8 Pro if their form factors suit you, but compare the real USD total, variant and seller first. This review does not verify a live offer below $100.