
OnePlus
The OnePlus comeback — Wear OS with 100-hour battery

Oppo
A week-long-battery budget smartwatch
OnePlus Watch 2
OnePlus Watch 2
OnePlus Watch 2
Stainless-steel 47mm case with a sapphire crystal display. Two physical buttons. Large and substantial — the heft is the main design critique. Premium build for the price.
Oppo Watch S
The Oppo Watch S's headline is how little there is of it — a round ~45mm watch just 8.9mm thick and around 35g without the strap, built around a stainless-steel mid-frame. Reviewers say it nearly disappears on the wrist.
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Oppo Watch S
Oppo Watch S
OnePlus Watch 2
1.43-inch AMOLED, 466×466 resolution, sapphire crystal. Bright, sharp, with always-on support — the RTOS efficiency chip keeps the AOD battery cost low.
Oppo Watch S
A 1.46-inch round AMOLED at 464 x 464 (317 ppi). It can hit a brilliant 3,000-nit peak — but only automatically, in Oppo's workout modes under strong sunlight. In everyday use it's capped at 600 nits, with a 1,500-nit high-brightness mode.
OnePlus Watch 2
Optical HR, SpO2, sleep tracking, stress monitoring. OnePlus Health app for analytics. Covers the everyday-wellness basics; less polished than Samsung Health or Fitbit.
Oppo Watch S
For a budget watch the Oppo Watch S carries a serious sensor array — an 8-channel optical heart-rate sensor, a 16-channel SpO2 sensor, ECG electrodes and a skin-temperature sensor — anchored by a 60-second check that reads around 14 health indicators at once. ECG availability depends on regional certification.
OnePlus Watch 2
100+ workout modes, dual-frequency GPS, auto-detection. The long battery means multi-day workout tracking without recharge. 5 ATM water resistance.
Oppo Watch S
The Oppo Watch S covers 100+ workout modes with built-in GPS and an AI sports coach that gauges readiness from HRV and recent training load. It's a capable everyday fitness tracker — though there's little independent accuracy testing to confirm how it stacks up.
OnePlus Watch 2
500mAh battery — up to 100 hours with the always-on display off, the headline feature. Dual-engine architecture is the breakthrough. 10-minute fast charge returns a full day.
Oppo Watch S
The Oppo Watch S's strongest card. Oppo rates the 330mAh battery at up to 10 days maximum, 7 days typical and about 4 days with the always-on display on — and fast charging adds a full day in 10 minutes, with a complete charge in roughly 75-90 minutes.
OnePlus Watch 2
Wear OS 4 + the dual-engine architecture. OnePlus Health app, Google Wallet, full Play Store. Works with any Android phone. The Watch 2 returned OnePlus to Wear OS.
Oppo Watch S
The Oppo Watch S runs ColorOS Watch 7.1 on a power-efficient BES2800BP chip with 4GB of storage — not Wear OS. That choice is the reason the battery lasts a week, but it also means no Google Play app store and a simpler, more limited software experience.
OnePlus Watch 2
Stainless-steel case + sapphire crystal + 5 ATM water resistance + IP68 + MIL-STD-810H. A genuinely rugged build for the price.
Oppo Watch S
The Oppo Watch S is rated 5 ATM plus IP68 (and IP69), with Splash Touch that keeps the screen usable when wet. It's fine for swimming and everyday water — but Oppo specifically warns against hot showers, saunas and diving.
OnePlus Watch 2
Dual-frequency GPS, NFC for Google Wallet, Bluetooth, Wi-Fi. No LTE — phone required for connectivity.
Oppo Watch S
Built-in GPS, Bluetooth, Wi-Fi and NFC cover the everyday essentials. There's no cellular model, so the Oppo Watch S relies on a paired phone for connectivity.
OnePlus Watch 2
$299.99 launch. The Wear OS battery champion at launch. Competes with the Galaxy Watch 6 and the Pixel Watch 2 — and decisively beats both on battery.
Oppo Watch S
The Oppo Watch S launched at around $399 NZD (roughly $230 USD) and is not officially sold in the US. For the price it's a strong value — week-long battery, ECG, a premium-feeling build — as long as you accept the simpler ColorOS platform.