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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="color-scheme" content="dark light" />
<title>Submersion Dive Log</title>
<meta
name="description"
content="Submersion is a comprehensive, open-source dive logging application for recreational and technical divers. Cross-platform. No subscriptions. No vendor lock-in."
/>
<meta property="og:title" content="Submersion" />
<meta
property="og:description"
content="Dive logging software with complete data ownership. Open-source, cross-platform, and built for serious divers."
/>
<meta property="og:type" content="website" />
<link rel="icon" type="image/png" href="assets/favicon.png" />
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<a class="skip" href="#content">Skip to content</a>
<header class="top">
<nav class="nav" aria-label="Primary">
<a class="brand" href="#top">
<img
class="brand__mark"
src="assets/icon.png"
alt="Submersion"
width="72"
height="72"
decoding="async"
/>
<span class="brand__name">Submersion</span>
</a>
<div class="nav__links">
<a href="#why">Why</a>
<a href="#features">Features</a>
<a href="#screens">Screens</a>
<a href="#support">Support</a>
<a href="#download">Download</a>
<a class="btn btn--small" href="https://github.com/submersion-app/submersion" target="_blank" rel="noreferrer">
<svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
<path d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0024 12c0-6.63-5.37-12-12-12z"/>
</svg>
GitHub
</a>
</div>
</nav>
<section class="hero" id="top">
<div class="hero__grid">
<div class="hero__copy">
<p class="eyebrow">Open-Source • Cross-Platform • Free Forever</p>
<h1>Dive deeper.</h1>
<p class="lead">
Submersion is a comprehensive dive log that works on all your devices. No mandatory accounts. No subscription fees. No vendor lock-in. Your data stays yours.
</p>
<ul class="hero__stats" aria-label="Highlights">
<li>
<strong>Comprehensive Logging</strong>
<span>Capture every detail with deep analytics</span>
</li>
<li>
<strong>Open Standards</strong>
<span>UDDF 3.2 import and export</span>
</li>
<li>
<strong>300+ Dive Computers</strong>
<span>USB and Bluetooth connectivity</span>
</li>
</ul>
</div>
<div class="hero__visual" aria-hidden="true">
<div class="frame">
<img
class="frame__img"
src="screenshots/dive_details_1.png"
alt=""
loading="eager"
decoding="async"
/>
<div class="frame__glow"></div>
</div>
</div>
</div>
</section>
</header>
<main id="content">
<section class="section" id="why">
<div class="container">
<div class="section__head">
<h2>Full control over your dive data.</h2>
<p>
Traditional dive logging solutions either rely on outdated desktop software or mobile applications that restrict data access behind mandatory accounts and proprietary cloud infrastructure. Submersion offers a different approach.
</p>
</div>
<div class="cards" role="list">
<article class="card" role="listitem">
<h3>Complete Data Ownership</h3>
<p>
Your dives stay on your device. Sync to the cloud only if you want to. Export your logbook whenever you want.
</p>
</article>
<article class="card" role="listitem">
<h3>Vendor Independence</h3>
<p>
Full UDDF 3.2 import and export capability, plus CSV support. Your dive history remains portable, both now and for years to come.
</p>
</article>
<article class="card" role="listitem">
<h3>Unified Cross-Platform Experience</h3>
<p>Available for iOS, Android, macOS, Windows, and Linux. Consistent logbook functionality and analytics across all devices.</p>
</article>
<article class="card" role="listitem">
<h3>Free, forever</h3>
<p>Open-source software licensed under GPL‑3.0. No advertisements. No premium feature restrictions.</p>
</article>
</div>
</div>
</section>
<section class="section section--tight" id="features">
<div class="container">
<div class="section__head">
<h2>For recreational and technical divers.</h2>
<p>Simple by default. Advanced when needed.</p>
</div>
<div class="featureGrid">
<div class="feature">
<h3>Dive Documentation</h3>
<ul>
<li>Complete dive records including conditions, timestamps, and temperatures</li>
<li>Trip organization with tags, favorites, and detailed notes</li>
<li>Multi-cylinder configurations with gas mix tracking (air, nitrox, trimix)</li>
</ul>
</div>
<div class="feature">
<h3>Site Management</h3>
<ul>
<li>GPS coordinate recording with interactive map visualization</li>
<li>Comprehensive site data: depth ranges, difficulty ratings, hazard documentation</li>
<li>Automatic location capture with reverse geocoding</li>
</ul>
</div>
<div class="feature">
<h3>Dive Computer Integration</h3>
<ul>
<li>Direct USB and Bluetooth connectivity</li>
<li>Incremental download with intelligent duplicate detection</li>
<li>Support for 300+ models via libdivecomputer</li>
</ul>
</div>
<div class="feature">
<h3>Technical Diving Support</h3>
<ul>
<li>Bühlmann ZH‑L16C decompression algorithm with gradient factor configuration</li>
<li>Real-time NDL, ceiling, TTS, CNS, and OTU calculations</li>
<li>Complete multi-gas dive planning and tracking</li>
</ul>
</div>
</div>
</div>
</section>
<section class="section" id="screens">
<div class="container">
<div class="section__head">
<h2>A closer look.</h2>
<p>A clean interface for comprehensive dive logging.</p>
</div>
<div class="gallery">
<article class="tile">
<img src="screenshots/home_screen.png" alt="Dashboard Overview" loading="lazy" decoding="async" />
<h3>Dashboard Overview</h3>
<p>Recent dives, statistics, and navigation. Local data storage with complete offline functionality.</p>
</article>
<article class="tile">
<img src="screenshots/dive_log.png" alt="Efficient Dive Entry" loading="lazy" decoding="async" />
<h3>Efficient Dive Entry</h3>
<p>Depth, duration, temperature, conditions, and annotations. Automated numbering and surface intervals.</p>
</article>
<article class="tile">
<img src="screenshots/dive_details_1.png" alt="Comprehensive Dive Records" loading="lazy" decoding="async" />
<h3>Comprehensive Records</h3>
<p>Location, environmental conditions, and multi-cylinder gas configurations in one view.</p>
</article>
<article class="tile">
<img src="screenshots/dive_sites.png" alt="Site Database" loading="lazy" decoding="async" />
<h3>Site Database</h3>
<p>GPS coordinates, regional data, and automatic reverse geocoding for every dive site.</p>
</article>
<article class="tile">
<img src="screenshots/sites_map.png" alt="Interactive Map View" loading="lazy" decoding="async" />
<h3>Interactive Map</h3>
<p>All dive sites on an interactive map with intelligent marker clustering.</p>
</article>
<article class="tile">
<img src="screenshots/equipment.png" alt="Equipment Management" loading="lazy" decoding="async" />
<h3>Equipment Management</h3>
<p>Service intervals, gear configurations, and per-dive assignments with reminders.</p>
</article>
<article class="tile">
<img src="screenshots/statistics.png" alt="Dive Statistics" loading="lazy" decoding="async" />
<h3>Dive Statistics</h3>
<p>Total dives, bottom time, depth records, and lifetime trends at a glance.</p>
</article>
</div>
</div>
</section>
<section class="section" id="support">
<div class="container">
<div class="section__head">
<h2>Support</h2>
<p>
Found a bug or have a feature idea? <a href="https://github.com/submersion-app/submersion/issues" target="_blank" rel="noreferrer">Open an issue on GitHub</a>.<br />
For other inquiries, email <a href="mailto:support@submersion.app">support@submersion.app</a>.
</p>
</div>
</div>
</section>
<section class="section section--cta" id="download">
<div class="container">
<div class="download">
<div class="section__head">
<h2>Download Submersion</h2>
<p>
Comprehensive and open-source. You own your data. No accounts required.
</p>
</div>
<a
id="download-primary"
class="download__primary btn"
href="https://github.com/submersion-app/submersion/releases"
target="_blank"
rel="noreferrer"
>
<span id="download-primary-icon"></span>
<span>
<span id="download-primary-label">Download</span>
<small id="download-primary-meta" class="download__version"></small>
</span>
</a>
<div class="download__stores" id="download-stores">
<a
class="download__store"
href="https://apps.apple.com/us/app/submersion-dive-log/id6757456915"
target="_blank"
rel="noreferrer"
>
<img
src="assets/app-store-badge.svg"
alt="Download on the App Store"
width="120"
height="40"
/>
</a>
</div>
<div class="download__secondary" id="download-secondary">
<p class="download__secondary-label">All platforms:</p>
<div class="download__platforms" id="download-platforms"></div>
</div>
<div class="download__fallback">
<a href="https://github.com/submersion-app/submersion" target="_blank" rel="noreferrer">
<svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
<path d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0024 12c0-6.63-5.37-12-12-12z"/>
</svg>
View on GitHub
</a>
<a href="https://github.com/submersion-app/submersion#quick-start" target="_blank" rel="noreferrer">
Build Instructions
</a>
</div>
</div>
<footer class="footer">
<p>
© <span data-year></span> Submersion. Open-source software licensed under GPL‑3.0.
</p>
</footer>
</div>
</section>
</main>
<script src="script.js" defer></script>
</body>
</html>