DJI
Osmo Action 4
1/1.3-inch sensor action camera with 10-bit D-Log M and strong stabilization.
$299
Released Aug 2023
Insta360
Ace Pro 2
8K Leica-lens action camera with 1/1.3-inch sensor, 4K60 Active HDR, PureVideo low-light mode, and 12m waterproofing.
$449
Released Oct 2024
Ace Pro 2 is 1.3 years newer.
Wins
Osmo Action 4
Wins
Ace Pro 2
5 categories tied
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TL;DR — Key differences
- BAce Pro 2 has higher Resolution (50 MP vs 10 MP)
- AOsmo Action 4 has higher ISO max (native) (12,800 vs 6,400)
- BAce Pro 2 has higher RAW buffer depth (120 frames vs 60 frames)
- AOsmo Action 4 has higher 4K max frame rate (120 fps vs 60 fps)
- BAce Pro 2 has higher Burst (mechanical) (8 fps vs 6 fps)
Key specs at a glance
Size and weight, to scale
Osmo Action 4
71 × 44 × 33 mm
145 g (0.32 lb / 5.11 oz)
Ace Pro 2
72 × 52 × 38 mm
177.2 g (0.39 lb / 6.25 oz)
Osmo Action 4 is 1mm narrower, 8mm shorter, and 5mm thinner than Ace Pro 2.
Osmo Action 4 is 32 g lighter than Ace Pro 2.
Depth (front-to-back): 33mm Osmo Action 4 · 38mm Ace Pro 2
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose
Osmo Action 4
Dimensions (W×H×D mm)
Adds 70.5, 44.2, 32.8
ISO max (native)
12,800 vs 6,400 — higher is better
4K max frame rate
120 fps vs 60 fps — higher is better
Codecs
Adds HEVC
Weight
145 g vs 177.2 g — lower is better
Reasons to choose
Ace Pro 2
Dimensions (W×H×D mm)
Adds 71.9, 52.2, 38
Resolution
50 MP vs 10 MP — higher is better
RAW buffer depth
120 frames vs 60 frames — higher is better
Internal RAW video
Only Ace Pro 2 supports it
Codecs
Adds H.265
Burst (mechanical)
8 fps vs 6 fps — higher is better
Burst (electronic)
20 fps vs 15 fps — higher is better
IBIS effectiveness
7 stops vs 6 stops — higher is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓Max video bit rate — Both 200 Mbps
- ✓Weather sealing — Both support weather sealing
- ✓Battery life (CIPA) — Both 640 shots
- ✓Card slots — Both 1
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Osmo Action 4
Pros
- ✓10-bit D-Log M
- ✓Good low light for action cam
- ✓Affordable
Cons
- –Superseded by Action 5 Pro
- –Fixed lens
Ace Pro 2
Pros
- ✓8K30 video
- ✓1/1.3-inch Leica lens
- ✓PureVideo night mode
- ✓12m waterproof
Cons
- –8K drains battery faster
- –Premium vs DJI Action
- –Fixed lens
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for landscape, Osmo Action 4 or Ace Pro 2?
Ace Pro 2 scores 5.0/10 versus 1.5/10 for Osmo Action 4 — 50MP — massive detail for large prints.
What's the resolution difference between the Osmo Action 4 and Ace Pro 2?
Osmo Action 4 is 10 MP and Ace Pro 2 is 50 MP, so the Ace Pro 2 captures more detail for cropping and large prints.
Do the Osmo Action 4 and Ace Pro 2 have in-body image stabilization?
Osmo Action 4 does not have IBIS, while ace Pro 2 does not have IBIS.
Which shoots faster bursts — the Osmo Action 4 or the Ace Pro 2?
Osmo Action 4 reaches 15 fps electronic. Ace Pro 2 reaches 20 fps electronic.
What's the weight difference between the Osmo Action 4 and Ace Pro 2?
Osmo Action 4 weighs 145 g and Ace Pro 2 weighs 177.2 g, so the Osmo Action 4 is 32 g lighter.
Do the Osmo Action 4 and Ace Pro 2 record 4K video?
Osmo Action 4: 4K up to 120p. Ace Pro 2: 8K (max), 4K up to 60p.
Are the Osmo Action 4 and Ace Pro 2 weather sealed?
Osmo Action 4: Yes. Ace Pro 2: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the Osmo Action 4 and 640 shots for the Ace Pro 2, giving the Ace Pro 2 the edge.
How much does each cost?
Osmo Action 4 launched at $299 and Ace Pro 2 at $449. The Osmo Action 4 is $150 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.