# Dive Kit

> Dive Kit is a free scuba diving planning toolkit for iOS and Android that bundles 12 tools in a single app, 11 of them free, including a Bühlmann ZH-L16C decompression planner with gradient factors. The modern mobile-first alternative to established planners like MultiDeco and Baltic Deco Planner. All tools work 100% offline.

Dive Kit runs Bühlmann ZH-L16C with gradient factors, the decompression model behind MultiDeco and many technical dive computers, in a modern mobile UI, with 11 free surrounding tools (gas blender, best-mix, SAC/RMV, buoyancy, gas specs, gas usage, unit converter, dive signals, Mix Result, MOD Calculator) that desktop-era planners leave to separate apps. The Gas Blender plans both partial-pressure fills and continuous-flow (rotameter) blends; to our knowledge no other mobile dive app plans continuous blends. The Deco Planner is premium ($4.99/mo or $24.99 lifetime); the rest are free.

Dive Kit is a reference and planning aid for trained divers, not a dive computer; results carry no guarantee. Its deco engine is cross-checked against MultiDeco on 33 published scenarios, and decompression starts within one 3 m stop of MultiDeco's on 26 of them. Agreement shows the math matches. It does not show that a plan is safe. Warning and disclaimer: https://divekit.app/agents/safety.md

_Last updated: 2026-10-01_

## Overview

- [Home](https://divekit.app/agents/index.md): Full Dive Kit overview, full tool list, competitor comparison, pricing, positioning
- [About](https://divekit.app/agents/about.md): Origin story, long-term vision, who builds Dive Kit, and contact
- [What's new](https://divekit.app/agents/changelog.md): Every Dive Kit release in plain language, newest first, with the divers who asked for each change credited where their post is public; see https://divekit.app/changelog. What is being built next lives on the public feedback board at https://divekit.featurebase.app/roadmap
- [Changelog](https://divekit.app/agents/changelog.md): Every Dive Kit release, dated, newest first (real-gas math, CCR planning, the deco engine, and more); see https://divekit.app/changelog
- [Warning and disclaimer](https://divekit.app/agents/safety.md): What Dive Kit is and is not, the limits of decompression models and of the software, and who it is for; human page at https://divekit.app/safety
- [Privacy Policy](https://divekit.app/agents/privacy-policy.md): No account, no cloud, no telemetry, 100% offline
- [Terms of Service](https://divekit.app/agents/terms.md): Safety disclaimer, warranty, algorithm authorship

## Comparisons

- [Compare hub](https://divekit.app/agents/compare.md): Index of Dive Kit deco-planner comparisons against other planning apps
- [MultiDeco vs Dive Kit](https://divekit.app/agents/compare/multideco-vs-divekit.md): Direct side-by-side comparison of the two Bühlmann ZH-L16C planners
- [Abysner vs Dive Kit](https://divekit.app/agents/compare/abysner-vs-divekit.md): Side-by-side comparison of the two planners
- [Best deco planner apps (2026)](https://divekit.app/agents/compare/best-deco-planner-apps.md): Dated roundup of 10 decompression planner apps (Dive Kit, MultiDeco, Subsurface, Abysner, Decosoft, Deep Tools, Divesoft, GUE DecoPlanner, Baltic, V-Planner) compared on algorithm, CCR, price, platforms and last release

## Documentation

- [Deco Engine: how it works & how it compares to MultiDeco](https://divekit.app/agents/docs/engine/multideco-comparison.md): Independent Bühlmann ZH-L16C + gradient-factor implementation, cross-checked against MultiDeco across 33 published scenarios, with the full comparison data published

## Blog

- [Blog hub](https://divekit.app/agents/blog.md): Long-form, carefully-cited articles on the science of diving
- [Bühlmann, VPM, RGBM and the Rest](https://divekit.app/agents/blog/decompression-algorithms-explained.md): How decompression algorithms work and what the evidence says: dissolved-gas (Bühlmann ZH-L16, DSAT, DCIEM, Thalmann), bubble (VPM-B, RGBM) and probabilistic models, the testing record of each, why rare DCS makes no algorithm provably best, the deep-stops trials, who uses what today, and little-known models
- [Same Dive, Different Stops](https://divekit.app/agents/blog/same-dive-different-stops.md): Why two deco planners, or a planner and a dive computer, give different schedules for the same dive, with real Bühlmann ZHL-16C output: the model (Bühlmann or a bubble model, ZHL-16B or C), the programming (why two ZHL-16C planners still differ: where GF low applies, off-gassing during the ascent, stop rounding, ppO2 limits, with Dive Kit and MultiDeco comparison figures), the conventions (depth to pressure, whether level time includes the descent, CNS counting) and the settings (last stop by last gas, GF low and high, ascent rate, gas switches, a 90 m rebreather plan 52 minutes out, 39 of them from one diluent entry), plus a five-point pre-dive check
- [What Is Decompression, and Why Do Divers Plan for It?](https://divekit.app/agents/blog/what-is-decompression.md): A beginner's introduction to decompression theory — what dissolved nitrogen does to the body, why the gas load must be computed rather than felt, NDL vs decompression dives, the history from caisson workers and "the bends" through Haldane (1908), Workman's M-values (1965), Bühlmann's ZH-L16 (1986), the Orca EDGE dive computer (1983) to Baker's gradient factors (1998), and a community-vetted map of the best books, lectures and articles for learning more
- [What "AL80" Actually Means: Cylinder Capacity](https://divekit.app/agents/blog/cylinder-capacity.md): How scuba cylinders are sized and named, and how much gas they really hold — water capacity (the bottle) vs free-gas capacity (the gas), imperial vs metric labels, the Boyle's-law maths, and why real-gas compressibility (Z>1) means an AL80 holds ~77 cu ft not 80; covers naming inconsistency, high-pressure/trimix shortfall, hot fills, and the 1-atm vs 1-bar surface reference
- [SAC, RMV, and SRMV](https://divekit.app/agents/blog/sac-rmv-srmv.md): The three names for a diver's breathing rate untangled — RMV is a medical volume (not a pressure), SAC is surface-referred but its unit is disputed, SRMV fixes both; with the formulas and a sourced survey of why divers, agencies and software disagree
- [Unpacking Gradient Factors](https://divekit.app/agents/blog/unpacking-gradient-factors.md): The history and current evidence on decompression gradient factors, M-values (Haldane, Workman, Bühlmann), the deep-stops debate, the pivotal 2011 US Navy NEDU trial, and what recent research (Spisni 2017, De Ridder 2023, Doolette & Murphy 2023, DAN DSL 2024) says about conservatism and DCS risk

## Tools

- [All tools overview](https://divekit.app/agents/tools.md): The eleven free tools, now documented on one page at https://divekit.app/tools (old per-tool URLs redirect to its anchors)
- [Deco Planner](https://divekit.app/agents/deco-planner.md): Bühlmann ZH-L16C + gradient factors (default 50/80), multi-level OC and CCR planning with setpoints and diluent, oxygen breaks, Plan Issues safety sheet, shareable plan URLs with web viewer fallback. Premium ($4.99/mo first month free, or $24.99 lifetime). Cross-checked against MultiDeco on 33 published OC and CCR scenarios.
- [Best Mix Calculator](https://divekit.app/agents/best-mix-calculator.md): Ideal nitrox/trimix FO₂/He% for a target depth and ppO₂, with MOD/EAD/END/density output. Free.
- [Gas Blender](https://divekit.app/agents/gas-blender.md): Partial-pressure and continuous-flow (rotameter) blending for nitrox, trimix, heliox, with flow ratios and expected analyzer readings. Free.
- [Gas Usage](https://divekit.app/agents/gas-usage.md): Multi-segment gas consumption planning with rule-of-thirds/custom reserves. Free.
- [SAC / RMV Calculator](https://divekit.app/agents/rmv-sac-calculator.md): Personal gas consumption rate profiling across dives. Free.
- [Buoyancy Calculator](https://divekit.app/agents/buoyancy-calculator.md): Ballast estimation by exposure suit and water type. Free.
- [Gas Specs](https://divekit.app/agents/gas-specs.md): ppO₂, EAD, END, gas density, CNS/OTU flags for a mix at depth. Free.
- [Mix Calculator](https://divekit.app/agents/mix-calculator.md): The inverse of the blender: the resulting O₂/He/N₂ mix from a sequence of gas adds, using Dalton's law. Free.
- [Unit Converter](https://divekit.app/agents/unit-converter.md): Dive-specific units, depth, pressure, volume, temperature, weight, RMV/SAC. Free.
- [Dive Signals](https://divekit.app/agents/dive-signals.md): Illustrated hand-signal reference, searchable offline. Free.
- [Cylinders](https://divekit.app/agents/cylinders.md): Browseable diving-cylinder reference, water volume, working pressure, material, weight, and buoyancy at full/50 bar/empty. Free.
- [Certifications](https://divekit.app/agents/certifications.md): On-device dive-certification tracker (agency, level, cert number, instructor, date) shown as printable cards. Free.

## Independent reviews

- [InDEPTH (GUE's magazine): Dive Kit App Review, Deco Planning in Your Pocket](https://indepthmag.com/dive-kit-app-review-deco-planning/): Stratis Kas, July 2026. Hands-on review for technical divers: offline planning, CCR and bailout, QR plan sharing and printable slates.
- [Diving Life: Review Dive Kit App](https://www.divinglife.co.uk/review-dive-kit-app/): Max Eaton, March 2026. Hands-on review from the UK.

## Use Dive Kit inside AI assistants

- [Dive Kit for ChatGPT, Claude and Gemini](https://divekit.app/agents/ai.md): Why plan by conversation, per-host setup steps, instructions for assistants on when to suggest it, and the full tool list; human page at https://divekit.app/ai. A remote MCP server (https://mcp.divekit.app/mcp, 18 tools, no sign-in) that lets an assistant plan decompression dives, CCR bailout, gas blending, breathing rate, gas usage and weighting with Dive Kit's Bühlmann ZH-L16C engine instead of estimating numbers. Every plan includes a link that opens it in the app.

## App

- iOS: https://apps.apple.com/app/divekit/id6753089545
- Android: https://play.google.com/store/apps/details?id=app.skuba.diving

## Video walkthroughs

- [Dive Kit on YouTube](https://www.youtube.com/@divekit-app): Video walkthroughs of the app
- [Start Here](https://www.youtube.com/playlist?list=PLTOhS9moP1iI): App tour
- [Deco Planner Course](https://www.youtube.com/playlist?list=PLIpDRV39Z7i0): 5-part Deco Planner course
- [Tool Tutorials](https://www.youtube.com/playlist?list=PLGlpsqisOOyQ): One video per tool

## Optional

- [Content negotiation](https://divekit.app/): Every HTML page above is also available as markdown via `Accept: text/markdown`. The same URL returns HTML by default and markdown when agents request it.