The maths,
done honestly.
Bühlmann ZHL-16C with gradient factors and full trimix, validated against Subsurface. It will never quietly bend an impossible plan — it surfaces it as an error, where you can see it.
Bühlmann ZHL-16C, with gradient factors.
The same algorithm the serious tools use — sixteen tissue compartments, nitrogen and helium throughout, with gradient factors you set yourself. Plan a single dive or a staged technical descent with multiple gases and deco mixes.
- Full N₂ + He trimix, not nitrox-only
- Gradient factors (e.g. 40/85) under your control
- Multiple bottom and deco gases, switched at depth
EAN32 reaches a PO₂ of 2.1 bar at 60 m — above the 1.6 limit. Choose a hypoxic mix or reduce the depth.
It tells you when a plan won't work.
A planner that silently produces a number for an impossible dive is dangerous. ScubaOS refuses to — an unbreathable mix, a missing gas, an ascent the model can't honour are surfaced as a clear, labelled error, with the limit that broke it. Never colour alone; always an icon, a label and the offending value.
- PO₂ and MOD limits checked for every gas
- Impossible schedules raised, never quietly bent
- Validated against Subsurface, with CI that fails on divergence
Simple by default. Technical when you need it.
The planner adapts to the diver, not the other way round. In recreational mode it's a clean no-stop slate; switch to technical and gradient factors, multiple gases, and the full deco schedule appear — the same app, revealing depth, never a different one.
No-stop slate
Depth, time and gas in, no-decompression limit and turn pressure out. Everything a rec dive needs, nothing it doesn't.
Full deco plan
Gradient factors, gas switches, runtime, stop-by-stop schedule and gas consumption per cylinder.
Honest by design
The hard limits are always on. The model never hides a problem to give you a tidier number.
Under the hood.
No software can guarantee a safe dive. ScubaOS is a planning aid — always dive within your training and trust your certified dive computer in the water.
Plan your next dive.
The full decompression planner is part of Plus — a one-time purchase. Quick-slate planning is free.