Oppo Watch S vs Watch X3
Size, specs & wrist fit compared
As an Amazon Associate, WatchFitTool earns from qualifying purchases.
Which one fits you
On wrists narrower than about 50mm, the Watch S is the safer pick — it stays proportionate down to roughly 47mm, where the Watch X3 starts to hang over the edge. Above 50mm both sit cleanly, and the Watch X3 gives you more presence.
The Watch X3 wears larger than the Watch S (47.4mm vs 45mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Watch S is the slimmer of the two (8.9mm vs 11mm), so it slides under a cuff more easily.
On the wrist the Watch S feels lighter (35g vs 43g, case only).
The Watch S is thinner than 100% of the 45mm watches we track and the Watch X3 than 98% of the 47mm ones — so both wear flatter than their widths suggest.
The Watch X3 is 2.4mm wider, 2.4mm longer, 2.1mm thicker and 8g heavier than the Watch S. Both are circular.
Watch S
Watch X3
Switch or add watches
Oppo
Watch S
Oppo
Watch X3
Watch Fit Tool
For sports watches, lug-to-lug (L2L) is what matters most — it decides whether a watch overhangs your wrist. Bulky is fine; overhang is not.
Measure at the point where you wear your watch — typically just below the wrist bone.
Flat width — lay your arm on a table, palm facing up, and measure straight across the top of your wrist with a ruler. Bone to bone; do not follow the curve down the sides.
Around — wrap a tape measure snugly round the wrist. No tape? Wrap a strip of paper, mark the overlap and hold the strip against a ruler.
Width ≠ circumference. They are different numbers — around 170mm is about 64mm across — so set the toggle to whichever one you actually measured before you type it in.
Oppo Watch S
Case 45.0mm · Lug-to-lug 45.0mm · Thickness 8.9mm · 35g
Balanced Fit
45mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 45mm, so you could go bigger.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist5.0mm spare each side
Comfortable, with visible skin either side.
- Off the wrist8.9mm off the skin
Sits low enough to disappear under a cuff. (8.9mm case, back against the skin)
- How it seats~5.2mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist35g
Light enough to forget you have it on. (0.6g per mm of wrist)
Oppo Watch X3
Case 47.4mm · Lug-to-lug 47.4mm · Thickness 11.0mm · 43g
Sweet Spot
47.4mm on a 55mm wrist
Across the wrist it works — 3.8mm spare each side — but wide enough that the edge of the case back lifts clear of the skin.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 47.4mm.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist3.8mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist11.0mm off the skin
Normal sports-watch height for a wrist this size. (11.0mm case, back against the skin)
- How it seats~6.3mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist43g
Light enough to forget you have it on. (0.8g per mm of wrist)
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
- Oppo Watch S45mm · 8.9mm thick
- Oppo Watch X347.4mm · 11mm thick
3D preview
Watch S vs Watch X3 on a wrist
Sized to your own wrist, turned any way you like.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Battery life compared
Furthest apart in Smartwatch mode, where the S lasts 1.4× as long as the X3 (7 days against 5 days).
SX3
Battery Saver
—384 hoursSmartwatch
7 days5 days
Specifications
The short version
10 key specs| Spec | OppoWatch S | OppoWatch X3 |
|---|---|---|
| Case Width | 45mm | 47.4mm |
| Thickness | 8.9mm | 11mm |
| Weight | 35g | 43g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.46 inches | 1.5 inches |
| Battery life | 7 days | 5 days |
| Released | 2025 | 2026 |
Every specification
111 specs| Spec | Oppo Watch S | Oppo Watch X3 |
|---|---|---|
| Design | ||
| width | 45 | 47.4 |
| height | 45 | 47.4 |
| volume | 18.02 cm³ | 24.71 cm³ |
| weight | 35 g | 43 g |
| thickness | 8.9 | 11 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 464 x 464 px | 466 x 466 px |
| screen size | 1.46 inches | 1.5 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 317 ppi | 310 ppi |
| width of band | 22 mm | — |
| water resistance | Waterproof | Waterproof |
| Always-On Display | No | Yes |
| has a touch screen | Yes | Yes |
| is designed for kids | No | No |
| waterproof depth rating | 1.5 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | Yes |
| Ingress Protection (IP) rating | IP68 | IP69 |
| has branded damage-resistant glass | No | No |
| maximum operating temperature | — | 70 °C |
| lowest potential operating temperature | — | -40 °C |
| Battery | ||
| battery life | 7 days | 5 days |
| battery power | 339 mAh | 646 mAh |
| has wireless charging | No | No |
| has a removable battery | No | No |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| charge time | — | 1.3 hours |
| battery life in power save mode | — | 384 hours |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | Yes | Yes |
| has a gyroscope | Yes | Yes |
| Has a cadence sensor | No | No |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | Yes | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| release date | 2025-10-16 | 2026-03-17 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | 1 years |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| has HRV tracking | Yes | No |
| internal storage | 4GB | 32GB |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | Yes | Yes |
| Locates your phone | No | Yes |
| has a front camera | No | No |
| has fall detection | No | No |
| has voice commands | Yes | Yes |
| Acquires GPS faster | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 0 | — |
| shows readiness level | Yes | No |
| Can be used to answer calls | Yes | Yes |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | Yes | No |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | — |
| RAM | — | 2GB |
| Connectivity | ||
| has NFC | No | Yes |
| supports ANT+ | No | No |
| supports Wi-Fi | No | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.2 | 5.2 |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Wi-Fi version | — | Wi-Fi 4 (802.11n) |
| Miscellaneous | ||
| Has passcode | Yes | Yes |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| has a battery level indicator | Yes | Yes |
| has a socket for a 3.5 mm audio jack | Yes | No |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Has coaching | No | No |
| Supports routes | No | No |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Tracks water intake | Yes | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | — |
| Has temperature tracking | Yes | Yes |
| Doesn’t require account | No | No |
| Provides activity reports | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | Yes | Yes |
| Designed for golf | No | No |
| Tracks your sleep | Yes | Yes |
| Tracks steps taken | Yes | Yes |
| Designed for diving | No | No |
| Has a route tracker | Yes | Yes |
| Has exercise tagging | Yes | Yes |
| Tracks calorie intake | Yes | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | Yes | — |
| Has multi-sport mode | — | No |
Wrist Fit
Oppo Watch S
Sits best on wrists ~47–64mm wide (≈ 12.6–17.1cm circumference).
Oppo Watch X3
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
Frequently Asked Questions
Is the Oppo Watch S bigger than the Oppo Watch X3?
The Oppo Watch X3 is bigger — 47.4mm vs 45mm case width.
Which fits a smaller wrist better, the Oppo Watch S or the Oppo Watch X3?
The Oppo Watch S suits wrists around 47–64mm wide, and the Oppo Watch X3 around 50–68mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Oppo Watch S and Oppo Watch X3 side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.