Submersion Dive Log vs ToolsX

Submersion is a comprehensive, open-source dive log for recreational and technical divers. Track dives, manage gear, analyze trends, and export to open formats. No subscriptions, no proprietary lock-in, no cost. COMPLETE DIVE LOGGING • Log unlimited dives with depth, duration, temperature, and conditions • Track entry/exit times with automatic surface interval calculation • Rate dives, add notes, and organize with custom tags • Record visibility, current, waves, weather, and water type • Support for 20+ dive types including night, wreck, cave, and technical DIVE COMPUTER INTEGRATION • Connect via Bluetooth or USB to well known dive computer models • Import dive profiles with one tap—no cables to your computer needed • Smart duplicate detection prevents importing the same dive twice • Supported brands: Shearwater, Suunto, Mares, Aqualung, Garmin, Oceanic, and many more ADVANCED PROFILE ANALYSIS • Interactive depth/temperature charts with zoom and pan • Bühlmann ZH-L16C decompression algorithm with gradient factors • Real-time NDL, ceiling, and tissue loading visualization • Ascent rate monitoring with color-coded warnings • O₂ toxicity tracking (CNS%, OTU, ppO₂) for nitrox and trimix divers • SAC/RMV calculation and trend analysis TECHNICAL DIVING READY • Multi-tank support with unlimited cylinders per dive • Full gas mix tracking: Air, Nitrox, Trimix, and pure O₂ • Gas switch markers on dive profiles • MOD, END, and EAD calculations built-in • Tank presets for quick logging (AL80, HP100, Steel 12L, and more) GEAR & EQUIPMENT MANAGEMENT • Track all your gear: regulators, BCDs, computers, suits, and more • Service history with reminders when maintenance is due • Create equipment sets for different diving configurations • Weight calculator based on exposure suit and conditions DIVE SITES & MAPS • Build your personal dive site database with GPS coordinates • Interactive map with clustered markers showing all your sites • Capture location from your phone or pick from the map • Automatic reverse geocoding fills in country and region • Track site details: depth range, difficulty, hazards, and access notes MARINE LIFE TRACKING • Log species sightings with counts on each dive • Pre-loaded database with common species • Build your personal life list over time BUDDIES & CERTIFICATIONS • Manage your dive buddy list with certification levels • Track your own certifications with expiry reminders • Associate buddies and instructors with each dive • Log dive centers and boat names STATISTICS & INSIGHTS • Total dives, bottom time, and depth records • SAC trends over months and years • Temperature preferences by season • Dive frequency charts and gas mix distribution • Deepest, longest, coldest, and warmest dive records CLOUD SYNC & BACKUP • Sync across all your devices via iCloud or Google Drive • Local-first design works completely offline • Export to UDDF, CSV, or PDF • Import from other dive log apps PRIVACY FOCUSED • No account required—start logging immediately • Your data stays on your device (unless you enable cloud sync) • No ads, no tracking, no subscriptions • Open source: inspect the code yourself on GitHub Whether you're a new diver logging your first open water dives or a technical diver tracking complex trimix profiles, Submersion adapts to your needs. Join the growing group of divers who trust Submersion to preserve their dive information. Questions or feedback? Visit our GitHub repository.

ToolsX is the gas calculator for technical and recreational diving: plan the right mix, check safety limits and get the exact blending recipe, all in one beautifully designed app. GAS PLANNER • Automatic nitrox or trimix recommendation from depth and max ppO2 • Live MOD, END, ppO2 at depth and gas density • Density warnings (5.2 and 6 g/L thresholds) and mix depth ceiling • Manual trimix analysis with free O2/He input and "oxygen is narcotic" option MIX RECIPE • Enter your starting and target mix: the app computes the exact helium, oxygen and air additions • Fill sequence picked automatically from all 6 permutations to minimize the transient ppO2 peak • Step-by-step breakdown with tank pressure and ppO2 after every addition BLEND STUDIO • Direct partial-pressure trimix blender • Step blending mode (add He, O2, air) with final mix and ppO2 peaks • Manual sequence override when you need it PRESETS • Save and recall complete gas, tank and blending setups • Metric (m, bar, L) or imperial (ft, psi, ft³) units with automatic conversion Italian and English interface, instant calculations as you type, Liquid Glass design built for iOS 26. Note: ToolsX is a planning aid. It does not replace technical training, gas analysis procedures or your dive computer. Always dive within the limits of your certification.