Device hub · Fitness watches · Desk research
Apple Watch SE 3
SE 3 is Apple’s $249 Always-On Watch: S10, sleep score, sleep-apnea notifications, Fall/Crash Detection, and Siri AI — without Series 12’s Health Sensing System, ECG, Blood Oxygen, or 2,000-nit panel.
In short
SE 3 is Apple’s $249 Always-On Watch: S10, sleep score, sleep-apnea notifications, Fall/Crash Detection, and Siri AI — without Series 12’s Health Sensing System, ECG, Blood Oxygen, or 2,000-nit panel. Buy it for an iPhone daily driver that charges every night. Skip it if you need ECG or Ultra hardware.
Product images
Placeholder — OEM press not licensedApple Watch SE 3
Credit: GadgetShowdown labeled placeholder (not an Apple asset). View official product image
Apple product images are copyrighted. Apple’s third-party IP guidelines and typical Newsroom “editorial use only” language do not grant a commercial comparison site a redistribution license.
Studio still only. Manufacturer press JPEGs are not hosted here. See the Apple product page for the real product photo.
Placeholder — OEM press not licensedApple Watch SE 3
Credit: GadgetShowdown labeled placeholder (not an Apple asset). View official product image
Studio still only. Manufacturer press JPEGs are not hosted here. See the Apple product page for the real product photo.
Who it is for
- iPhone owners who want Always-On, sleep score, sleep-apnea notifications, and Fall/Crash Detection without paying $399 for Series 12.
- Parents using Apple Watch For Your Kids on a cellular SE 3 (features limited — see Apple’s footnotes).
- SE 2 owners who want the S10, 64GB, Always-On up to 1,000 nits, fast charge, and watchOS 27 (SE 2 is off that OS list).
- Buyers who will accept no ECG and no Blood Oxygen in exchange for the $249 start.
Who should skip it
- Anyone who needs ECG, Blood Oxygen, hypertension notifications, or readiness. Apple’s own compare module marks those as Series 12 (and Ultra) rows, not SE 3.
- Buyers without a compatible iPhone. Support 125094 requires iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 26 or later; watchOS 27 needs iOS 27.
- People who want Ultra adventure hardware: no Action Button, no satellite, no 100m / 40m dive path, no 3,000-nit panel.
- Shoppers who want Health Sensing System or Audio Intelligence. Those are S11 / Series 12 / Ultra 4 stories.
Key differentiators
- Lowest current Apple Watch start: $249 (US), with Always-On (SE 2 did not have Always-On at this brightness class).
- S10 + 64GB + watchOS 27 — SE 3 is on Apple’s 2026 OS list; older SE 2 is not.
- Sleep score and sleep-apnea notifications on a value SKU (region-limited).
- Apple’s compare module is unusually honest about what is missing: ECG, Blood Oxygen, readiness, hypertension, Audio Intelligence.
Caveats
- Every numeric battery and brightness line is an Apple claim. GadgetShowdown has not lab-tested SE 3.
- No ECG and no Blood Oxygen are Apple omissions, not independent medical advice. Do not write “unsafe.”
- Education pricing on apple.com has shown $229 — that is a program price, not a new MSRP.
- Ion-X “4× more crack resistant than SE 2” is an Apple materials claim.
Watch-category specs
Same manufacturer rows on every watch page.
| Attribute | Value | Source / note |
|---|---|---|
| Display size | 40mm: 759 sq mm; 44mm: 977 sq mm | Apple Support 125094 |
| Display type | Always-On Retina OLED with LTPO; tough Ion-X front glass | Apple Support 125094 |
| Display resolution | 40mm: 324 × 394 px; 44mm: 368 × 448 px; 326 ppi | Apple Support 125094 |
| Peak brightness (OEM) | Up to 1,000 nits peak; 2 nits minimum | Apple Support 125094; SE 3 product compareManufacturer peak-nits claim. Series 12 compare module lists 2,000 nits; Ultra 4 lists 3,000. |
| Always-On display | Yes | Apple Support 125094 |
| Case size(s) | 40mm and 44mm | Apple Support 125094 |
| Case material | Aluminum; Apple states 100% recycled aluminum in the case | Apple Support 125094 |
| Case dimensions | 40mm: 40 × 34 × 10.7mm; 44mm: 44 × 38 × 10.7mm | Apple Support 125094 |
| Weight | 40mm GPS 26.3 g / cellular 26.4 g; 44mm GPS 32.9 g / cellular 33.0 g | Apple Support 125094Case-only figures from Apple; band not included. |
| Finishes | Starlight aluminum; midnight aluminum | Apple Support 125094 |
| Chip / processor | S10 SiP, 64-bit dual-core processor, 4-core Neural Engine | Apple Support 125094 |
| On-device storage | 64GB | Apple Support 125094 |
| Battery — normal use (OEM) | Up to 18 hours of normal use | Apple Support 125094 |
| Battery — low-power / saver (OEM) | Up to 32 hours in Low Power Mode | Apple Support 125094 |
| Battery — GPS / outdoor workout (OEM) | Not published | Apple Support 125094 footnote 6 |
| Charging (OEM) | Magnetic Fast Charger to USB-C in the box. Up to 80% in about 45 minutes; 15 minutes ≈ 8 hours normal use; 8 minutes ≈ 8 hours of sleep tracking | Apple Support 125094 |
| Water resistance | 50m (ISO 22810:2010) — shallow-water swim; not scuba, waterski, or high-velocity water | Apple Support 125094 footnote 11 |
| GNSS / GPS | L1 GPS (GLONASS, Galileo, QZSS, BeiDou) | Apple Support 125094Single-frequency L1. Not Ultra’s L1+L5 precision dual-frequency. |
| Cellular | GPS and GPS + Cellular SKUs. Models A3326 and A3328: 5G RedCap and LTE (band list on the spec sheet) | Apple Support 125094 |
| Heart rate | Second-generation optical heart sensor; Heart Rate app; high/low HR and irregular-rhythm notifications | Apple Support 125094; SE 3 compare moduleNo electrical heart sensor for ECG. Not Health Sensing System. |
| Blood oxygen (SpO2) | No Blood Oxygen app (Apple compare module: not applicable) | Apple SE 3 product compare; Support 125094 sensor list omits a blood-oxygen sensor |
| Temperature sensing | Wrist temperature sensor (footnote: not medical use; available on SE 3) | Apple Support 125094 |
| ECG | No ECG app (Apple Newsroom / compare: Series 4 and later excluding SE) | Apple Series 12 Newsroom footnote 3; SE 3 compare module |
| Sleep tracking | Sleep app including sleep stages; Sleep score; sleep-apnea notifications (region / age limits) | Apple Support 125094 |
| Sport / workout profiles (OEM) | Running, hiking, cycling, swimming, plus skiing, snowboarding, outdoor rowing, paddling, golf, walk, elliptical, HIIT, yoga, and the rest of Support 125094’s list | Apple Support 125094 |
| Other sensors | Compass; always-on altimeter; high-g accelerometer; high-dynamic-range gyroscope; ambient light sensor | Apple Support 125094 |
| Durability / ingress | 50m water resistance; Ion-X “4× more crack resistant than SE 2” (Apple claim). No IP6X / MIL-STD row on Support 125094 | Apple Support 125094 |
| Safety / incident alerts | Emergency SOS; international emergency calling; Crash Detection; Fall Detection; noise monitoring; Backtrack | Apple Support 125094 |
| Operating system | watchOS at launch (watchOS 26 family); watchOS 27 supported (SE 3 is on Apple’s 2026 list) | Apple Support 125094; Series 12 Newsroom |
| Phone compatibility | iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 26 or later on the spec sheet; watchOS 27 requires iOS 27 | Apple Support 125094; Series 12 Newsroom |
| Wireless (Wi-Fi / Bluetooth) | Wi-Fi 4 (802.11n), 2.4GHz; Bluetooth 5.3. 5GHz Wi-Fi is not listed (Series/Ultra sheets list 2.4 + 5GHz) | Apple Support 125094 |
| NFC / contactless payments | Apple Pay; GymKit | Apple Support 125094 |
| Band / strap system | Apple Watch band interface (not 22mm quick-release). Box includes one band. | Apple Support 125094 |
| US MSRP (launch) | Starts at $249 (US) | Apple Newsroom, 2025-09-09; apple.com/apple-watch-se-3/Apple Newsroom, 9 September 2025. Education pricing may show $229 — cite the program, do not replace MSRP. |
| Price band | Value Apple Watch ($200–$300 US) | Derived from Apple $249 start |
| Announced | 9 September 2025 | Apple Newsroom |
| Availability | Pre-order from 9 September 2025; stores from Friday, 19 September 2025; still in the 2026 lineup next to Series 12 and Ultra 4 | Apple Newsroom; 2026 compare module |
Apple Watch SE 3 extras
Unique to this line or SKU.
| Attribute | Value | Source / note |
|---|---|---|
| ECG (absent) | No ECG app — Apple’s compare module and Newsroom footnote exclude all SE models | Apple SE 3 compare; Series 12 Newsroom footnote 3 |
| Blood Oxygen app (absent) | No Blood Oxygen app on Apple’s Series 12 compare module | Apple SE 3 product compare |
| Readiness (absent) | Readiness app not applicable on Apple’s compare module | Apple SE 3 product compare |
| Hypertension notifications (absent) | Not applicable on Apple’s compare module | Apple SE 3 product compare |
| Audio Intelligence (absent) | Not applicable — S11 feature on Series 12 / Ultra 4 | Apple SE 3 product compare; Series 12 Newsroom footnote 2 |
| Siri AI | Listed on the SE 3 compare module (watchOS 27 / Apple Intelligence rules still apply) | Apple SE 3 product compare |
| Sleep-apnea notifications | Yes — Series 9 or later, Ultra 2 or later, and SE 3 (Apple footnote). Ages 18+; moderate-to-severe signs; not a diagnosis | Apple Support 125094; Series 12 Newsroom footnote 4 |
| Wrist fit | 40mm fits 130–200mm wrists; 44mm fits 140–245mm wrists | Apple Support 125094 |
| Model number | A3326 and A3328 (cellular / 5G RedCap + LTE SKUs on the spec sheet) | Apple Support 125094 |
| Ion-X glass claim | Apple: 4× more crack resistant than Apple Watch SE 2 | Apple Support 125094 footnote 5 |
| Gestures | Double tap and wrist flick; Siri with on-device processing | Apple Support 125094 |
| In the box | Apple Watch SE 3; band; Magnetic Fast Charger to USB-C (1m) | Apple Support 125094 |
| Recycled content (OEM) | Apple: 40% recycled content, including 100% recycled aluminum in the case | Apple Support 125094 |
| Apple Watch For Your Kids | Supported on cellular models (not all features; see Support 109036) | Apple Support 125094 |
| Running metrics | Custom workouts; training load; HR zones; Race Route; Pacer; stride length, ground contact time, vertical oscillation; automatic track detection; multisport. Running power is not listed on the SE 3 running block (Ultra sheets list power) | Apple Support 125094 |
| Hiking / offline maps | Compass; waypoints; Backtrack; offline maps; U.S. topographic maps; curated hikes across 63 U.S. national parks | Apple Support 125094 |
| Cycling metrics | Speed, elevation, distance; Bluetooth cycling accessories; FTP; power zones; cadence; Live Activity on iPhone | Apple Support 125094 |
| Swim metrics | Pool and open water; custom pool workouts; splits / auto sets; SWOLF; automatic stroke and kickboard detection. Water-temperature sensor is not on the SE 3 swim block | Apple Support 125094 |
| Operating envelope | Operating 0°C to 35°C; altitude 0–3,000m (no Ultra-style −20°C on-wrist / 9,000m envelope on this sheet) | Apple Support 125094 |
| Accessibility features | VoiceOver, Zoom, AssistiveTouch, Type to Siri, RTT, and the rest of the Support 125094 list | Apple Support 125094 |
Overview
Apple Watch SE 3 is the September 2025 value Watch — and it is still the $249 rung next to Series 12 and Ultra 4 in Apple’s 2026 compare module. The physical product is a 40mm or 44mm aluminum watch with Ion-X glass, Digital Crown, side button, and a second-generation optical heart sensor. There is no Action Button and no electrical ECG path.
This hub exists so the SE vs Series fork can cite Support 125094 instead of guessing from retailer bullets. The first table is watches-v1.
We do not claim we wore this watch.
Display
Always-On Retina OLED + LTPO, 326 ppi, up to 1,000 nits / 2 nits minimum, Ion-X glass. 40mm is 324 × 394 (759 sq mm); 44mm is 368 × 448 (977 sq mm). Series 12’s compare peak is 2,000 nits; Ultra 4’s is 3,000. Do not write “as bright as Series 12.”
Health and sensors
Optical HR (second generation), wrist temperature, high/low HR notifications, irregular-rhythm notifications, Cycle Tracking with retrospective ovulation estimates, Medications, Mindfulness, Noise. No electrical heart sensor, no ECG app, no Blood Oxygen app, no Health Sensing System, no readiness.
Sleep tracking
Sleep app with stages, Sleep score, sleep-apnea notifications (18+, moderate-to-severe signs, not a diagnosis). 8 minutes of charge ≈ 8 hours of sleep tracking per Apple’s footnote.
Battery and charging (OEM table only)
| Mode (Apple’s words) | SE 3 claim |
|---|---|
| Normal use | Up to 18 hours |
| Low Power Mode | Up to 32 hours |
| Outdoor-workout hour | Not published as its own row |
| Fast charge | ~80% in about 45 minutes; 15 min → up to 8h normal use; 8 min → up to 8h sleep tracking |
Workouts
Support 125094 still gives dedicated running, hiking, cycling, and swimming blocks — including Race Route, Pacer, form metrics (not running power), U.S. park maps, FTP, and SWOLF. That is more sport depth than the “value” nickname implies. Keep sport_profiles short and put metric depth in extras.
Safety, payments, bands
Fall Detection, Crash Detection, Emergency SOS, international emergency calling, Backtrack, noise monitoring. Apple Pay and GymKit. One band in the box — Apple does not name the colorway per SKU. Cellular models list Family Setup / For Your Kids.
Software
watchOS 26-era launch; watchOS 27 supported. Siri AI appears on the 2026 compare module. Audio Intelligence does not.
How this page compares on a desk
| Desk fact (OEM) | SE 3 | Series 12 (compare module) |
|---|---|---|
| Start price | $249 | $399 |
| Case | 40/44mm aluminum | 42/46mm aluminum, titanium, or ceramic |
| Peak nits | 1,000 | 2,000 |
| Chip | S10 | S11 |
| ECG / Blood Oxygen / readiness | No | Yes |
| Sleep score / sleep-apnea | Yes | Yes |
| Normal / Low Power | 18 h / 32 h | 24 h / 38 h |
| watchOS 27 | Yes | Yes |
Price and what not to invent
US start is $249. Do not invent Amazon averages or “we wore SE 3 for a week.” A future SE 3 vs Series 12 page should reuse these rows, not a new schema.
Compare this watch (3)
Named-pair pages only.
Sources
- Apple Support — Apple Watch SE 3 Tech Specs (125094) — accessed 2026-09-19
- Apple Newsroom — Apple introduces Apple Watch SE 3 — accessed 2026-09-19
- Apple — Apple Watch SE 3 product page (compare module vs Series 12) — accessed 2026-09-19
- Apple — Guidelines for Using Apple Trademarks and Copyrights — accessed 2026-09-19
Frequently asked questions
Does SE 3 have ECG or Blood Oxygen?
No. Apple’s compare module marks ECG, Blood Oxygen, readiness, and hypertension notifications as not applicable. Newsroom’s ECG footnote excludes all SE models. Do not write that a watchOS 27 update adds those sensors.
Does SE 3 get watchOS 27 and Siri AI?
Yes. Apple’s Series 12 Newsroom lists SE 3 on watchOS 27. The SE 3 compare module lists Siri AI. Audio Intelligence stays a Series 12 / Ultra 4 (S11) row.
Is $249 a street price?
$249 is Apple’s published US starting price. Education pages have shown $229. Cellular, bands, and AppleCare are separate. Re-check apple.com on the day you quote a number.
Can kids use SE 3 without their own iPhone?
Cellular models support Apple Watch For Your Kids. Apple’s footnote says not all features are available in that setup. A parent iPhone still manages the watch.
Is SE 3 swimproof?
Apple rates it 50m under ISO 22810:2010 for shallow-water swimming. The footnote says not for scuba, waterskiing, or high-velocity water. There is no 6m snorkel depth gauge on the SE 3 compare module (Series 12 lists that extra).
Does SE 3 track sleep?
Yes. Support 125094 lists a Sleep app with stages, a Sleep score, and sleep-apnea notifications (region-limited). We have not measured overnight accuracy.
Official product page: Apple Watch SE 3. Tech specs: Apple Watch SE 3 specs.