Deep Tools vs Dalton

The complete dive planner, dive log and dive calculator app for recreational, technical and rebreather divers. Plan decompression dives with Bühlmann ZH-L16 and gradient factors, import your dives from a Shearwater dive computer, blend nitrox and trimix, and get quick answers to the questions you ask before every dive. All in one app, for open circuit (OC) and CCR. Whether you are in dive training, planning complex deco dives, or logging your underwater adventures, Deep Tools gives you reliable results you can trust. DIVE CALCULATORS - Maximum Operating Depth (MOD) - Oxygen partial pressure (ppO₂) - Equivalent Air Depth (EAD) - Equivalent Narcotic Depth (END) - Equivalent Air Density Depth (EADD) - No Decompression Limit (NDL) - Best nitrox mix for depth - Best trimix mix for depth - Gas consumption (SAC / RMV) and gas density - Lift bag calculator DECO PLANNER * Plan complex dives with confidence on open circuit (OC) or rebreather (CCR): - Bühlmann ZH-L16B and ZH-L16C with gradient factors (GF) - Multi-level and repetitive dive planning - Lost gas plans and CCR bailout planning, with custom bailout points - Gas consumption, CNS and OTU for every dive - Dive profile, run time table, tissue pressure graph and slate view - Share dive plans as a file, text, slate or image DIVE LOG * - Import dives from Shearwater dive computers (Petrel, Perdix, NERD, Teric and more) - Full dive profile with ppO₂, CNS, TTS, SAC and gas density - Dive sites with name, coordinates, map and custom tags - Automatically merge dives with short surface intervals - Share dives with your buddies - Local backup and easy transfer to a new device GAS BLENDER * Mix accurate nitrox and trimix: - Partial pressure blending to the desired gas - Blending with a top-off gas - Continuous flow blending - Gas cost estimate MORE - Metric and imperial units - Altitude diving and water type (salt, fresh, EN13319) - Custom tank / cylinder database - Available in 11 languages * The deco planner, dive log and gas blender are included in Deep Tools Premium. Try them free during the free trial. Deep Tools is a planning aid. It does not replace proper dive training or certification. Special thanks to V. Paul Gordon, Serge Nelissen and Michael Heus for extensive testing and valuable contributions. Terms of Use: https://www.deepblue.si/privacy/terms-of-service.php Privacy Policy: https://www.deepblue.si/privacy/

Know your gas. Trust your numbers. Dalton is the gas calculator that shows its work. Every result is verified against PADI Nitrox Tables, TDI Trimix Tables, and Shearwater manuals. Every formula is published with step-by-step derivations and source citations. No black boxes. GAS CALCULATIONS - MOD (Maximum Operating Depth): Find the safe depth limit for any gas mix based on your ppO2 tolerance - Equivalent Air Depth: Calculate nitrogen loading equivalents for nitrox decompression planning - Equivalent Narcotic Depth: Determine narcotic effects at depth for trimix planning - Best Mix: Find the optimal oxygen percentage for your target depth - Gas Properties: Calculate density, partial pressures, and breathing resistance at depth DIVE PLANNING - Return Number (Dalton Pro): Gas volume required for safe ascent — rule of thirds, fourths, or custom reserve fractions. The overhead environment gas management tool most divers do on paper or skip entirely - Dive Profile Advisor (Dalton Pro): Plan multi-level dives with gas switches and depth segments - Bottom Time Calculator (Dalton Pro): Determine available bottom time based on gas supply and consumption Dalton Pro tools require a one-time in-app purchase. All gas calculation tools are free. FORMULA REFERENCE Tap any result to see the full formula derivation with source citations. Dalton is the only mobile gas calculator that publishes every formula it uses. Teach the math. Show the math. SHARE YOUR CALCULATIONS Share any result as a URL with a QR code. Recipients with Dalton installed open the calculation directly in the app. Everyone else sees a web preview with the full results. Dalton Pro tool links show a result summary before the in-app purchase prompt -- useful for team briefings where not everyone has the app. Export formula cards as branded images. Send your gas plan to a buddy, post it in the group chat, or print it for the dive briefing whiteboard. One calculation, shared with the entire team in seconds. HOME SCREEN AND LOCK SCREEN WIDGETS - Quick Launch: A 2x2 grid that opens MOD, Best Mix, EAD/END, or Gas Properties with a single tap. No navigating through menus at the fill station - Quick MOD Reference: Pre-computed MOD for your selected gas mix, available on home screen and lock screen in circular, rectangular, and inline formats. Glance at your lock screen and see your MOD without opening the app - Both widgets are free - All values are pre-computed inside Dalton. No calculation logic runs in the widget extension SAFETY-FIRST DESIGN - Three-tier safety warnings tied to recognized physiological thresholds - Gas-density guidance from Anthony and Mitchell research: preferred below 5.2 g/L, caution from 5.2 to below 6.2 g/L, danger at 6.2 g/L and above - Configurable safety limits with ppO2 range from 1.2 to 1.6 bar - Standard gas mix presets: Air, EAN32, EAN36, and common trimix blends - Full gas range: air, nitrox, and trimix including hypoxic blends to 300m - All calculations work offline; anonymous crash and release-health diagnostics may be sent when online - No subscriptions, no ads, no account creation Every calculation is verified. Every result is reliable. A Tools for Divers, LLC product