Submersion Dive Log vs LetsDive

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.

LetsDive – Your Personal Logbook & Social Hub Log your dives, discover new sites, and connect with the global diving community. LetsDive is a comprehensive logbook and social platform designed for every diver, whether you are a newbie finishing your first course or an experienced explorer with hundreds of dives under your belt. Your Logbook, Your Way Say goodbye to tedious, manual entry. Log your dives through an intuitive interface and keep your history organized with custom trip folders and image galleries that make it easy to view and search your past adventures. • Precise Location Logging: Record exact GPS coordinates and automatically link your dives to specific sites. • Cross-Platform Access: Use LetsDive on your mobile device or access it as a desktop web app to make data entry and photo uploads from your computer a breeze. • Streamlined Data Import: Bring your existing dive logs into the app to keep your dive history in one place. • Full Data Ownership: Export your logbook in universal formats whenever you want for backups or to use with other software. • One-Touch Quick Entry: Speed up your logging with saved gear and gas defaults, complemented by smart, site-specific suggestions for your frequent dive buddies and local marine life. • Organized Trips: Create custom folders for your trips, complete with dive lists, photo galleries, and quick-search functionality to find your favorite moments in seconds. • Smart Merge: LetsDive identifies potential split dives for you to review and merge, keeping your history clean and organized. • Logbook Preview Mode: Explore the intuitive interface and features immediately by clicking "Sign Up" and selecting "Try the demo logbook" before creating an account. Be Part of Building the Ultimate Dive Resource Your dive site submissions, shared photos, and environmental data from your logs—such as visibility, temperature, and marine life sightings—help build a comprehensive dive resource for everyone. While your personal logbook remains completely private, anonymous parameters from site logs are aggregated to help other divers to: • Track Local Visibility: Check recent visibility and temperature trends at local dive sites before heading out. • Plan Holiday Gear: See what thickness of wetsuit divers are currently using at your next holiday destination. • Find Species: Pinpoint where to find your bucket list species, from exotic nudibranchs to playful sea lions. Social Connectivity & Coordination Stay connected with your local dive scene and beyond. • Organize & Meet Up: Create or join groups to plan shore dives, boat trips, or social events. Whether you need a buddy or a group, planning is simple and convenient. • Dedicated Site Boards: Every dive site has its own message board. Post updates on current conditions, ask gear questions, or swap tips with others who have been there. • Share the Fun: Upload your best photos, comment on your friends' latest dives, and stay in touch through our direct messaging.