Apple Watch SE 3 vs OnePlus Watch 2

Apple Watch SE 3

The big SE 3 story: an always-on display, a first for the SE line. The LTPO OLED panel peaks at 1,000 nits — bright enough for everyday use, but half the Series 11's 2,000 nits and a third of the Ultra 3's 3,000.

• Always-on display arrives on the SE for the first time — Origin Disc: 'that alone is a huge upgrade for the SE line.'
• LTPO OLED panel peaks at 1,000 nits — fine for everyday use but dimmer than rivals.
• 1,000 nits is half the Series 11's 2,000 and a third of the Ultra 3's 3,000 — the SE 3's display is its clearest hardware compromise.
• Always-on is a personal-preference feature — some owners prefer to leave it off for extra battery life.

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.

• 1.43-inch AMOLED, 466×466 resolution — bright, sharp, vibrant.
• Always-on display supported — the BES2700 RTOS chip handles AOD efficiently, keeping the battery cost low.
• Sapphire crystal protection — scratch-resistant, premium at the price.
• Readable in daylight — adequate brightness for outdoor workouts.
• The large 47mm case gives the AMOLED panel plenty of room — generous display real estate.

Apple Watch SE 3

Heart rate is the SE 3's standout — testers rate it among the best wrist sensors available. Apple adds nightly wrist-temperature tracking and sleep apnea notifications. But ECG, blood oxygen (SpO2), and the Series 11's new hypertension alerts are all absent, and sleep-stage data underreports deep sleep.

• Heart-rate accuracy is excellent — Mike O'Brien tested it against a Polar H10 ECG chest strap and found it had the second-highest correlation of the watches tested, behind only the Pixel Watch 3.
• The Quantified Scientist rates the Apple Watch's optical heart-rate sensor as the best wrist HR monitor he has tested — the SE 3 inherits it.
• No ECG sensor — confirmed missing; if heart-rhythm ECG matters to you, you need the Series 11 or Ultra 3.
• No blood-oxygen (SpO2) sensor and no hypertension notifications — the Series 11's headline health features are absent.
• Apple adds nightly wrist-temperature tracking — the watch samples skin temperature roughly every 5 seconds overnight.
• Sleep apnea notifications are now included — a useful screening feature given how many people have undiagnosed sleep apnea.
• Sleep-stage tracking underreports deep sleep — Mike O'Brien recorded 45-55 minutes of deep sleep per night while reference devices showed 1.5-2.5 hours.

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.

• Optical HR + SpO2 — standard Wear OS sensor suite; reliable for steady-state, less accurate than a chest strap for intervals.
• Sleep tracking + stress monitoring — the OnePlus Health app covers everyday wellness insights.
• OnePlus Health app is less polished than Samsung Health or Fitbit — adequate basics, fewer AI-powered insights.
• No ECG on most regions — the Watch 2 lacks the clinical heart-rhythm feature found on Samsung/Apple/Pixel watches.
• Health tracking is adequate but not the Watch 2's selling point — battery and Wear OS are the headline features.

Apple Watch SE 3

The full watchOS workout app, activity rings, automatic workout detection, and built-in GPS. Apple rates about 7 hours of GPS workout tracking. It is not a dedicated running watch — no dual-frequency GPS — but for everyday fitness it covers the essentials well.

• Full watchOS workout app, activity rings and automatic workout detection — everything expected of an Apple Watch.
• Built-in GPS rated for about 7 hours of workout tracking — DesFit found real-world endurance well beyond that claim.
• The Quantified Scientist rates the Apple Watch SE as a pretty good GPS tracker — accurate enough for everyday runs and rides.
• Not a dedicated running watch — no dual-frequency GPS and no deep training analytics; serious runners still look to Garmin or the Ultra 3.
• Crash detection, fall detection and Emergency SOS carry over — Mike O'Brien notes fall detection is 'among the best in the industry.'

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.

• 100+ workout modes — broad activity coverage through the OnePlus Health app.
• Dual-frequency GPS — accurate tracking for running and outdoor activity, uncommon at the $299 price.
• The long battery enables multi-day workout tracking without recharge — a win for hikers and weekend warriors.
• Automatic workout detection — catches walks, runs, and cycling without manual start.
• 5 ATM water resistance — pool + open-water swim tracking supported.

Apple Watch SE 3

Apple still rates the SE 3 at 18 hours of all-day battery, and that conservative number holds — but independent endurance tests stretched it to 37-41 hours of continuous wear depending on size. The genuine upgrade is fast charging: roughly 0-80% in 45 minutes, with a 15-minute top-up buying about 8 hours. A low-power mode reaches ~32 hours.

• Fast charging is new to the SE line — about 0-80% in 45 minutes, matching Apple's claim in testing.
• A 15-minute top-up buys roughly 8 hours of use — enough to rescue a sleep-tracking night.
• Endurance test: the 44mm SE 3 ran ~41 hours of continuous wear and the 40mm ~37-38 hours — far beyond Apple's conservative 18-hour rating.
• Still rated 18 hours — fast charging helps, but daily charging is the reality, and you may need a pre-bed top-up for sleep tracking.
• A low-power mode extends life to roughly 32 hours on a single charge.

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.

• Up to 100 hours of battery with AOD off — The Verge: the dual-engine architecture 'will purportedly enable up to 100 hours of battery life.'
• Wired: 'The OnePlus Watch 2 offers Android users the best battery life from a smartwatch' — the standout achievement.
• Dual-engine architecture — a Snapdragon W5 performance chip + a BES2700 RTOS efficiency chip; the breakthrough behind the battery.
• 500mAh battery — paired with the dual-engine architecture, this is what nets the 100-hour figure.
• 10-minute fast charge returns a full day of use — class-leading charging speed.

Apple Watch SE 3

watchOS 26 on Apple's S10 chip — identical core performance to the Series 11 and Ultra 3, including double-tap and wrist-flick gestures. 64GB of storage. Apple Pay, the App Store and the full ecosystem are all here. The one hard limit: it works only with an iPhone.

• Same S10 chip as the Series 11 and Ultra 3 — TheJuan&Only confirms identical core performance across the lineup.
• Supports the S10-enabled gestures — double-tap and wrist-flick to dismiss notifications.
• 64GB of storage and the full App Store, Apple Pay, Find My and Siri — nothing core is cut from the experience.
• iPhone-only — like every Apple Watch, the SE 3 does not work with Android phones.
• TechRadar: it has 'the same fantastic chipset as the Ultra 3 and Series 11' — the SE 3 doesn't feel slow or cut-down in daily use.

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.

• Wear OS 4 — The Verge: the Watch 2 'will run on Google's Wear OS 4,' returning OnePlus to the platform after the original's RTOS-only OS.
• Dual-engine architecture — Wear OS runs on the Snapdragon W5; the BES2700 RTOS handles low-power tasks. OnePlus pioneered this approach.
• Full Google Play Store + Google Wallet — the complete Wear OS app ecosystem.
• OnePlus Health app — less polished than Samsung Health or Fitbit; adequate but not a strength.
• Works with any Android phone — not OnePlus-locked; cross-brand compatible.
• Android-only — no iOS compatibility.

Apple Watch SE 3

Crack-resistant Ion-X glass, now rated about 4x tougher than the SE 2, over an aluminum case. Water resistance is 50m (5 ATM) — fine for pool and open-water swimming.

• 50m (5 ATM) water resistance — rated for pool and open-water swimming.
• Crack-resistant Ion-X glass, now about 4x more crack- and scratch-resistant than the SE 2.
• DesFit notes Apple Watch aluminum models hold up well in practice — he has scratched only one across many Apple Watches going back to the Series 3.
• Not as scratch-hardened as the Series 11's ceramic-coated glass or the Ultra 3's sapphire — fine for everyday wear, not adventure abuse.

OnePlus Watch 2

Stainless-steel case + sapphire crystal + 5 ATM water resistance + IP68 + MIL-STD-810H. A genuinely rugged build for the price.

• Stainless-steel case — durable and premium at the $299.99 price.
• 5 ATM water resistance + IP68 — pool + open-water swim rated, dust-protected.
• MIL-STD-810H certified — drop, shock, and temperature resistance.
• Sapphire crystal display protection — highly scratch-resistant.

Apple Watch SE 3

Built-in GPS, Apple Pay via NFC, Bluetooth and Wi-Fi. An optional cellular model adds standalone connectivity for about $50 more. The SE 3 lacks the Series 11's second-generation ultra-wideband chip, so it can only ping a lost iPhone rather than guide you to it.

• Built-in GPS, Apple Pay (NFC), Bluetooth and Wi-Fi — the standard Apple Watch connectivity set.
• An optional cellular model adds standalone connectivity for roughly $50 more — useful for leaving the phone behind.
• No second-generation ultra-wideband chip — the SE 3 can only beep a lost iPhone, not precision-guide you to it like the Series 11.

OnePlus Watch 2

Dual-frequency GPS, NFC for Google Wallet, Bluetooth, Wi-Fi. No LTE — phone required for connectivity.

• Dual-frequency GPS — accurate tracking in urban canyons and dense tree cover, uncommon at the price.
• NFC for Google Wallet — contactless payments.
• Bluetooth + Wi-Fi — standard Wear OS connectivity stack.
• No LTE — phone required for connectivity; no standalone calls or texts.
• No satellite messaging — a feature reserved for higher tiers and later watches.

Apple Watch SE 3

At a held-steady $249, the SE 3 is the cheapest way into a current Apple Watch and the obvious pick for most iPhone owners. The $399 Series 11 adds ECG, blood oxygen, hypertension alerts, a brighter screen and 24-hour battery; the $799 Ultra 3 adds far more. For the majority, the SE 3's gaps will not be felt.

• TechRadar's verdict: the SE 3 'might be the best-value Apple Watch ever made.'
• Mike O'Brien calls it 'the best Apple Watch for most people' — major improvements with very few noticeable differences from the $400 Series 11.
• Gizmodo: 'The Apple Watch SE 3 is a stupidly good value for $250.'
• Step up to the $399 Series 11 for ECG, blood oxygen, hypertension alerts, a 2,000-nit screen and 24-hour battery — worth it only if you actually need those.
• Best for: first-time Apple Watch buyers and anyone who wants the core experience for the lowest price — Tom's Guide names the SE 3 'the best value, great for first-time users.'

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.

• $299.99 launch price — strong value for stainless steel, sapphire crystal, dual-frequency GPS, and 100-hour battery.
• Android Authority: the Watch 2 is 'setting a new benchmark regarding battery life, innovative dual-OS tech, and, arguably, design.'
• vs Galaxy Watch 6: OnePlus wins decisively on battery (100 hours vs ~30); Samsung wins on ecosystem, app polish, and size options.
• Now superseded by the OnePlus Watch 3 — bigger 631mAh battery, titanium bezel, rotating crown (but a higher US price).
• Best for: Android users who want full Wear OS with multi-day battery no other Wear OS watch matched at launch — and don't mind a large 47mm watch.