The Dive Kit app

Bühlmann ZH-L16C with gradient factors, for open-circuit and CCR dives. Build a dive from levels and gases, and Dive Kit returns the schedule, the gas for each cylinder, oxygen exposure and gas density, with the lost-gas, deeper and longer contingencies worked out at the same time. It is the one paid feature: the first month is free.

Send a plan as a link or show it as a QR code. The plan travels inside the link, so a buddy opens it in a browser or in the app with no account. For the water, export a slate as a PDF, a PNG or plain text.

Pick Single Tank or Twin Set, set your cylinder volume and start pressure (or load from a saved profile), then add depth + time + RMV steps to your dive profile. Dive Kit shows consumed and remaining gas after each step, with a final Summary card showing total used, remaining bar, and percent reserve.

Pick Single Tank or Twin Set, set your cylinder volume, then save measurements as you collect them, depth, time, start pressure, end pressure. Dive Kit normalizes each one to surface pressure and shows your SAC (bar/min) and RMV (L/min) summary, for use in your gas planning.

Pick Nitrox or Trimix mode and set the target depth and PPO₂ limit. Dive Kit returns the richest mix within that limit, with its MOD, equivalent air depth, equivalent narcotic depth and gas density. Color-coded warnings flag oxygen toxicity, narcosis and high gas density before you choose the mix.

Enter a gas mix and a depth: Dive Kit shows PPO₂, EAD, END and gas density as you type, and flags values past the oxygen toxicity limit, the narcotic depth limit and the gas density limit.

Set your altitude, ambient and fill temperatures, configure your banks (O₂, He, Air, with optional volume/pressure tracking), then save a named cylinder for every customer or buddy. Dive Kit returns a numbered fill plan: bleed, add He, add O₂, top with air, with the resulting mix and total gas drawn from each bank. For a mixing panel, Continuous mode computes the flow ratios for your rotameters and the readings to expect on the in-line analyzers.

Set your starting cylinder (volume, current pressure, residual mix), then add gases one step at a time, O₂, He, Air, or any custom mix. Dive Kit shows the resulting O₂/He/N₂ at each step and the final mix at target pressure.

A reference tool, not a substitute for a real-world weight check. Pick your water type (Fresh, Salt, EN13319, or Red Sea), cylinder configuration (Single, Twinset, or Sidemount), exposure protection, and gear, Dive Kit returns Start of Dive and End of Dive buoyancy, a breakdown by component, and an If Wing Fails what-if. Use it to compare the impact of changing one variable (a heavier cylinder, a different suit, an added stage) against your known-good setup.

Browse aluminum and steel cylinders by name (AL80, LP104, S80…). Each entry shows water volume, working pressure, material, typical weight, and the buoyancy at full / 50 bar / empty, for choosing a cylinder for the dive.

Six conversion modes: pressure, depth, volume, temperature, weight and RMV/SAC rate. Enter a value on either side and the other side updates. Tap to swap the units. Works offline.

Run the buddy check, a rebreather build or the team check from your phone. Write your own checklists or start from 13 presets, among them BWRAF, JJ-CCR, FX CCR, GUE CHAOS and EDGE and TDI START. Steps can carry a countdown, a stopwatch or a notes field, and progress is saved as you go.

93 dive signals with drawings and meanings: essential and technical hand signals, light signals, touch signals for zero visibility and marine life signals. Searchable and offline. The drawings are open data that anyone can use with credit.

A card for each diving certification you hold: agency, course, certification number, dates, instructor, dive centre and photos of the card's front and back. Dive Kit knows 27 agencies and suggests their courses as you type. Show Card puts a card full screen for a dive centre. Cards stay on your phone and open offline, and a card that is about to expire is marked.

Dive Kit keeps everything on your phone and has no account. A backup is one file with your settings, profile, certifications, gear, saved deco plans and checklists. Save it anywhere through the share sheet, or switch on automatic backup and the app keeps it current in your own iCloud Drive (iPhone and iPad) or Google Drive (iPhone, iPad and Android).

A backup is a copy, not sync: restore it on a new phone to move your data. What Dive Kit can see in your Google Drive is set out in the privacy policy.

Your name, photo, date of birth and dive insurance in one place. Tap the insurance number to copy it onto a dive centre's form. The profile reminds you when the policy expires within 30 days, and again once it has expired.

Set each unit on its own: bar or psi, metres or feet, litres or cubic feet, Celsius or Fahrenheit, kilograms or pounds. Every tool reads them, and so do your gas reserve rule and water density. Save your usual gas and cylinder pairs as presets and pull them into any tool with a tap.

Deco Planner defaults set the gradient factors and planner settings every new plan starts from. Appearance holds the style and theme (below), the language, the decimal separator, haptic feedback and animations.

Five styles change the look of the whole app without moving anything: Slate, the default, with square corners and ink outlines; Soft, with no outlines and soft shadows; Tactile, like a calculator, with keys and answers on a green LCD panel; Pop, loud and graphic; and Legacy, the look of the previous version. Each has a light and a dark version, and Auto follows your phone.

The app icon is a choice too: the new mark or the icon from the previous version.

Every calculator and the Deco Planner run on the phone, and your data is stored there, so the app works the same on a boat with no signal as at home. Only buying a subscription, opening a shared plan in a browser, app updates and the automatic cloud backup need a connection.

Dive Kit runs on iPhone and iPad and on Android. In English, German, Polish, Russian, Swedish, Turkish, Simplified Chinese and Korean, following your phone's language or the one you pick, with the decimal separator to match.