Active Log vs Submersion Dive Log

Active Log is an all-in-one app for scuba diving, technical diving, freediving, swimming and conditioning. Log and analyse your dives, import dives from supported dive computers, plan recreational and technical dives, train for freediving, create swimming workouts and improve your strength, endurance and conditioning. Whether you're a recreational diver, technical diver, freediver or swimmer, Active Log brings your activities, training and progress together in one place. DIVE LOGBOOK • Log recreational and technical scuba dives • Add dive details, locations, buddies, equipment, notes and photos • View your dive history and statistics • Track your progress and personal records • Store certifications, insurance, medical documents and assessments • Keep your diving information organised in one place DIVE COMPUTER & IMPORT Download dives directly from supported dive computers, including Shearwater, Suunto, Scubapro, Apeks and more. Import existing dive data from supported formats such as Subsurface/SSRF and FIT, or export and import dives in JSON format. Spend less time entering dive information manually and more time exploring your dives. DIVE PLANNER Plan your next dive before entering the water. Create recreational dive plans and review your dive profile, depth, time, gas requirements, decompression and expected run time. Keep your dive plans together with your dive logbook so you can plan, dive and review in one app. TECHDIVE Advanced planning and calculation tools for trained technical divers: • Decompression and multi-gas dive planning • Gas requirements and reserves • Gas Analyzer • Nitrox and Trimix blending • Recommended Gas Mix and Top-up Tank • MOD, EAD, END and PPO₂ calculations Active Log gives technical divers practical tools for preparing and analysing more complex dives. FREEDIVING Freediving is more than holding your breath. Train your breath, body and mind with: • CO₂ and O₂ tables • Custom apnea training • Dry training • Stretching and mobility • Mindset and mental preparation • Training history and progress tracking Build your freediving training around breathing, relaxation, physical preparation and mental performance. SWIMMING Train smarter in the pool or open water. • Create structured swimming workouts • Send swimming workouts to your Apple Watch or Garmin, follow your training, and sync completed results back to ActiveLog. • Organise workouts into warm-up, main sets, drills, recovery and cooldown • Train freestyle, backstroke, breaststroke, butterfly and more • Track distance, sets, intensity and rest • Record your swims • Follow your swimming progress over time Whether you're swimming for fitness, technique or performance, Active Log helps you structure your training and keep improving. CONDITIONING Improve the fitness that supports your diving, freediving and swimming. Create conditioning workouts focused on: • Strength • Endurance • Mobility • General fitness Combine water training with physical conditioning to become stronger, fitter and better prepared for your activities. TRACK YOUR PROGRESS Active Log brings your diving, freediving, swimming and training history together so you can follow your performance, statistics, goals and personal progress over time. YOUR ACTIVITIES, ANYWHERE Active Log works offline, so important information remains available at the dive site, on the boat, at the pool or while travelling. Your data can also be securely stored in the cloud and accessed across multiple devices. DIVE. FREEDIVE. SWIM. TRAIN. Log your adventures. Plan what comes next. Train with purpose. Track your progress. Active Log — your water sports, one app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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.