Diving Buddy
The dive log that learns your air. Plan, log, and watch your SAC sharpen with every dive — offline on your iPhone, backed by the deco math divers have trusted for decades.
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The dive log that learns your air. Plan, log, and watch your SAC sharpen with every dive — offline on your iPhone, backed by the deco math divers have trusted for decades.
Plan the dive. Dive the plan. Log the dive — and every log makes the next plan smarter.
Group dives into trips with notes, dates, and tappable emergency numbers. Pin each dive to a site from your personal library — coordinates, photos, and a MapKit pin when you're online.
Pre-dive plans capture gas mix, target depth, planned bottom time, buddy, role, and gear profile. Post-dive logs record what actually happened — pressures, deco stops, temperature, visibility, and comments.
Save a log with cylinder pressures and the app computes your Surface Air Consumption rate, rolls it into a 10-dive average, and seeds the next plan's SAC field automatically. The more you dive, the better your plans get.
Drop a UDDF or XML export from Shearwater Cloud, Subsurface, Suunto DM5, Garmin Dive — anything. Attach an imported dive to a log and it fills the blanks without overwriting what you typed. Re-imports are deduplicated.
Everything lives as JSON and image files in your device's Documents directory. No server, no account, no network required. Your data goes nowhere unless you export it yourself.
Bühlmann ZH-L16C repetitive-dive planning, nitrox blending, MOD, ascent gas, SAC, oxygen toxicity, weight required, and more. Attach a result to a plan and it lives in that plan's record forever.
Bundled guides for Beaufort scale, deco notes, hand signals, and nitrox tables. Default pre-dive and packing checklists shipped on first launch — make them your own, items stay checked between sessions.
Save multiple gear profiles (drysuit vs wetsuit) with one marked as default. Track certifications by agency, level, and expiry. See total dives, depth and time aggregates, and your SAC trend across the last 10 dives.
If your subscription ends, your dive logs, sites, profile, gear, and photos remain visible forever. Reference material and data export stay free, always. The app respects what you've already put in.
Plan a dive with a target depth, gas mix, and bottom time. Log it after with the pressures you actually came back on. Diving Buddy computes your SAC, rolls it into a 10-dive average, and seeds the next plan automatically.
Your numbers get sharper the more you dive. The app doesn't guess for you — it just stops making you re-enter what it already knows.
Save every site you've dived — coordinates, photos, the local hazards you only learn about the second time. Sites stay on your phone, ready offline, with MapKit pins when you have signal and clean fallbacks when you don't.
Pin a dive to a site and the next plan at that site can crib from what worked last time.
The same data model from the trip header down to a single dive's cylinder pressures.
Standalone tools, or attach a saved result to any dive plan.
The deco model is Bühlmann ZH-L16C — the same algorithm Shearwater and most modern dive computers run. NDL tables are BSAC '88. Coordinate conversion follows the conventions every chartplotter uses.
These aren't homegrown approximations or marketing reskins of a lookup table. They're the calculations the diving community has refined, audited, and trusted for decades. Diving Buddy implements them faithfully, in your pocket, offline.
Both tiers shown side by side on the paywall. No "preferred" plan, no bait-and-switch.
7-day free trial. Cancel any time from the App Store.
Pay once, dive forever. No subscription, no renewals.
Prices shown in your local currency.
Reference material (Beaufort scale, deco tables, hand signals, coordinate converter, default checklists) is always free. Data export is always free. If your subscription lapses the app stays read-only — your logs, sites, photos, and stats remain visible forever.
If yours isn't here, drop a note via the support link on the App Store listing.
Yes. Diving Buddy reads UDDF and XML exports from Shearwater Cloud, Subsurface, Suunto DM5, Garmin Dive, and anything else that produces standards-compliant UDDF. Re-imports are deduplicated, and imported data fills in your log without overwriting fields you typed by hand.
Yes. Diving Buddy is universal — one purchase covers iPhone and iPad.
By default, yes. There's no account and no server. Your trips, logs, sites, and photos live as JSON and image files in your device's Documents directory. The only thing that needs the network is MapKit pins and your original App Store purchase.
On your device. Nothing leaves your iPhone unless you explicitly export it. There's no analytics SDK reporting your dives, no cloud sync uploading your logs, no third parties involved.
Always — and it's free. Export every trip, dive, site, and photo as a JSON archive, plus a printable PDF logbook. Available with or without a subscription.
The repetitive-dive planner is Bühlmann ZH-L16C, the same model used by Shearwater and most modern dive computers. NDL tables are BSAC '88. Both have been audited and trusted by the diving community for decades.
Not yet. Diving Buddy is built for recreational and nitrox divers — open-circuit, air or EAN. Trimix and rebreather support aren't on the current roadmap.
No, iOS only. Building a native app that respects the platform takes the full attention of a small team.
Annual is a subscription with a 7-day free trial — best if you want to try the full app before committing. Lifetime is a one-time purchase — best if you know you'll use it long term, and it pays for itself in just over two years compared to the annual price.
Everything you've already logged stays visible, forever. Trips, sites, dives, photos, gear, and stats remain readable on your device. Data export and reference material stay free. You won't be able to create new entries until you renew — but nothing you wrote is held hostage.
Subsurface is excellent on the desktop but feels desktop-first on phone. Shearwater Cloud assumes you own a Shearwater computer and is built around their ecosystem. Diving Buddy is iPhone-first, accepts logs from any UDDF source, and adds a tight planning loop on top — your SAC from real dives feeds the next plan automatically. Different product, overlapping audiences.
Coming soon to the App Store for iPhone and iPad.
Available soon on the App Store