ScubaOS
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A dive team descending onto a large shipwreck, its superstructure rising out of the blue

Launching 2026 · iPhone to Linux

Log every dive. Plan the next one properly.

ScubaOS is a dive log and decompression planner in one, from easy recreational days to trimix. Local-first, and honest about the maths.

Get the app See the planner

iPhone · iPad · Android · Mac · Windows · Linux. Free to log and plan, no account needed.

Photo: Mo Tawil
ScubaOS
ScubaOS on the desktop: a sidebar and your customisable dive dashboard, with your last dive, this year's diving and your most-dived sites
The same dive on iPhone: a recorded dive, with its recorded depth profile

One app, the whole dive · 6 m

Most divers end up running a logbook app, a separate planner, a kit spreadsheet and a vendor cloud they don’t entirely trust. ScubaOS is one place for the whole dive. It starts as a clean, simple logbook, then reveals gradient factors, staged deco and trimix when you ask for them.

The log · 12 m

Every dive, kept properly.

The depth profile drawn as a clean trace, with temperature and tank pressure alongside. Your gas, your kit, your buddies, up to eight photos. The whole dive, readable at a glance.

  • Download over Bluetooth from hundreds of dive computers, from Shearwater and Suunto to Scubapro, Mares, Oceanic, Aqualung and Cressi, on iPhone, iPad and Android
  • Bring your history: UDDF, Subsurface, CSV and Garmin FIT import
  • Everything exports again in open formats. Your log is yours.

More about the log

A dive in full: the recorded depth profile with temperature, gas and ppO₂ tracks
The logbook: every dive with its own profile trace

Everywhere you’ve dived · 18 m

The log knows where you’ve been.

Every dive pinned on a map that works offline, sites ranked by your time underwater, and the year in numbers, without a spreadsheet in sight.

The dive map: your dives clustered on an offline world map
Your diving hub: your last dive, this year's diving, and quick links to your kit, sites and buddies, on a dashboard you arrange

The planner · 27 m Plus

The maths, done honestly.

Bühlmann ZHL-16C and VPM-B, with gradient factors and full trimix: the models the serious tools run, validated against Subsurface on every build.

If a plan can’t be dived, ScubaOS says so. It never quietly bends the schedule to give you a tidier number.

MOD · ppO₂ · ascent limits, always on
  • Two algorithms, multi-level and altitude, with CNS and OTU tracked throughout
  • A no-stop slate for recreational days, free forever
  • Warnings carry an icon, a label and the number, never colour alone

More about the planner

A 35-metre dive with a little decompression: gas, MOD, method, and the dive-conduct table with stop-by-stop schedule
The planner at the no-stop limit, offering to plan decompression rather than bend the schedule

Your data · 33 m

Your log lives on your device.

No account to log or plan, and nothing leaves your phone unless you choose. When you want a safety net, sync in layers: your own iCloud or Google Drive, or the ScubaOS server keeping every device in step.

  • Works completely offline. The boat has no signal, and that’s fine.
  • No ads and no selling your data. The maths is never the paywall
  • Shared dives fuzz the exact site and strip photo location automatically

How your data is handled

Storage & sync: on this device, your own iCloud or Google Drive, or your account and own server

And the rest · 36 m

Worth showing off.

Any dive becomes a crafted share card, and a calm feed keeps up with the divers you actually know. No reels, no DMs, no follower counts. Built safe by design.

Share & community

An exported share card for a recorded dive: profile trace, max depth, duration, average depth

Know what’s due.

Rigs instead of spreadsheets: regulators, cylinders and computers grouped the way you dive them, with servicing tracked by dives and by date.

Kit & servicing

Kit items, each with a category icon: a regulator flagged service due and a twin cylinder set flagged hydro overdue

Every device · 38 m

Native on everything you dive with.

One app on iPhone, iPad and Android, and a real desktop app on Mac, Windows and Linux. Not a website in a frame. Each screen gets its own layout; your dives follow you across all of them.

ScubaOS on iPad: a navigation rail beside your customisable dive dashboard, with your last dive and this year's diving
ScubaOS on a phone: the community feed
  • iPhone
  • iPad
  • Android
  • macOS
  • Windows
  • Linux

The deep end

What Plus and Pro unlock.

The logbook and quick planning are free forever. When you want more, these are the tools worth paying for, and why divers do.

A decompression plan: gas, MOD, cylinder and SAC, with a dive-conduct table of stops for plan, longer, deeper and worst case

Full decompression planner Plus

Bühlmann ZHL-16C and VPM-B with gradient factors and full trimix, validated against Subsurface. Multi-level and altitude dives, CNS and OTU, gas switches, and honest contingencies for going longer or deeper.

The trip planner reading tides for a dive site: looks diveable near slack, with tide times, slack windows and the current at the dive time

Tides & tidal streams Plus Pro

Tide heights, currents and slack windows for your site, on your day, with multi-day trips ordered around them. High-resolution streams around the UK and NW Europe, where slack water is the plan.

The photo studio editing a dive still: a graded underwater preview with hold-to-compare, a filmstrip of keepers, Auto and look presets, and colour, exposure and contrast sliders

Photo studio Plus

Point it at your dive footage and it picks the sharp frames and brings back the colour the water took. You pick the keepers and fine-tune the look, all on your device, straight onto the dive.

Your diving hub, kept in step across every device

Cross-device sync Pro

Every dive, photo and plan kept in step across your phone, tablet and desktop. Log it on one, it is already on the others.

Get the app See the plans

Pricing · 40 m

Free to dive. Pay only for the deep end.

The logbook, quick planning and computer download are free forever; the paid tiers cover what costs us to run. Plus is bought once; Pro is the only subscription.

Free
£0forever
no account needed

The full logbook, quick-slate planning, computer download and import, on your device, for good.

Plus One-time
£24.99once
pay once, yours for good

The full ZHL-16C + VPM-B + trimix planner, tides, share-card export and backup to your own cloud.

Pro Sync
£4.99/ month
or £44.99/yr · 7-day free trial

Everything in Plus, kept in step across every device, with more room in the community.

Compare every feature

See you in the water.

ScubaOS launches in 2026 on iPhone, iPad, Android, Mac, Windows and Linux. Leave your email and we’ll tell you the moment it’s ready. Nothing else, ever.

Launch news and your early-supporter discount. One confirmation email; you're subscribed only once you click it. Unsubscribe any time. Privacy.

Platforms & downloads

A planning aid, not a substitute for training or a certified dive computer.