Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | DJI - Osmo Action 3 | DJI - Osmo Action 4 |
|---|---|---|
| Waterproof depth | 16 m | 18 m |
| Stabilization | advanced | gimbal-class |
Between the Osmo Action 3 and Osmo Action 4, the Osmo Action 3 comes out ahead in several specs, while the Osmo Action 4 wins on waterproof depth / stabilization. Overall, the Osmo Action 3 scores 76.5 and the Osmo Action 4 scores 80.8 on our Mars Score.
Which should you buy?
The Osmo Action 4 edges ahead on the Mars Score (76.5 vs 80.8), but the 4.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The Osmo Action 3 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Osmo Action 4 if you care most about waterproof depth / stabilization. Its strongest claims are waterproof depth, stabilization. The single most decisive one: Waterproof depth — 12.50% more. 18 m vs 16 m.
Both ship with comparable max video, max 4k fps, horizon lock, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: DJI - Osmo Action 3 or DJI - Osmo Action 4?
DJI - Osmo Action 4 leads the current Mars Score by 4.3 points.The more useful decision is the trade-off behind that result: compare waterproof depth against the way you will actually use the product.
Choose DJI - Osmo Action 3 if…
DJI - Osmo Action 3 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose DJI - Osmo Action 4 if…
DJI - Osmo Action 4 has the measurable edge on water depth m, stabilization quality.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why DJI - Osmo Action 3 wins
- No decisive advantages.
Why DJI - Osmo Action 4 wins
- ▲Waterproof depth — 12.50% more. 18 m vs 16 m.
- ▲Stabilization: gimbal-class (vs advanced).
Spec comparison
Video
| Spec | DJI - Osmo Action 3 | DJI - Osmo Action 4 |
|---|---|---|
| Max video | 4K120 | 4K120 |
| Max 4K fps | 120 | 120 |
| HDRⓘ | true | true |
| Log profileⓘ | false | truelead |
Stabilization
| Spec | DJI - Osmo Action 3 | DJI - Osmo Action 4 |
|---|---|---|
| Horizon lock | true | true |
| Stabilization | advanced | gimbal-classlead |
Durability
| Spec | DJI - Osmo Action 3 | DJI - Osmo Action 4 |
|---|---|---|
| Waterproof depth | 16 m | 18 mlead |
| Weight | 145 g | 145 g |
| Removable lens | false | false |