# Dive Toolbox — Dive Planner & Gas Blending

> Dive Planner & Gas Blending (iPhone/iPad app by Onosia.)

- Source: https://appshunter.io/ios/app/dive-toolbox/id6759796903 (this page in markdown: same URL + `.md`)
- Developer: [Onosia](https://appshunter.io/developer/1880704645)
- Category: Sports, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 33 MB
- Languages: German (Germany), American English, French (France), Italian, Polish, Russian, European Spanish
- Released: 2026-04-16
- Data updated: 2026-09-06
- User reviews in markdown: https://appshunter.io/ios/app/dive-toolbox/id6759796903/reviews.md

## What is Dive Toolbox?

DiveToolbox — Professional dive planning and gas calculation tools for recreational and technical divers.                                                                                                                                                 
                             
  DECOMPRESSION DIVE PLANNER                            
  Plan single-level and multi-level dives using the Bühlmann ZH-L16C algorithm with configurable gradient factors. Get detailed ascent profiles, gas switch schedules, and comprehensive safety analysis including CNS, OTU, gas density, and END
  monitoring.

  GAS BLENDING CALCULATOR
  Step-by-step fill instructions for Nitrox and Trimix blending. Supports partial pressure and continuous flow methods with real-time MOD calculations.

  MOD / EAD / END CALCULATOR
  Instantly calculate Maximum Operating Depth, Equivalent Air Depth, and Equivalent Narcotic Depth for any gas mix.

  GRADIENT FACTORS EXPLORER
  Visualize how GF Low and GF High affect no-decompression limits and decompression schedules.

  SAC RATE CALCULATOR
  Calculate your Surface Air Consumption rate from dive data to improve gas planning accuracy.

  ROCK BOTTOM CALCULATOR
  Determine minimum gas reserves for safe ascent, including emergency scenarios with configurable safety margins.

  SUCCESSIVE DIVE PLANNER
  Plan repetitive dives accounting for residual nitrogen and helium tissue loading from previous dives.

  UNIT CONVERSIONS
  Convert between metric and imperial units for depth, pressure, volume, and temperature.

  KEY FEATURES
  • Multi-gas support with automatic deco gas switching
  • Save and organize dive plans in folders
  • Save tank presets for quick planning
  • Share plans via link or QR code
  • Export plans as PDF
  • Customizable diver profile (GF, SAC, PPO2, speeds)
  • Dark and light themes
  • Available in 7 languages: English, French, German, Spanish, Italian, Polish, Russian

Terms of Use: https://divetoolbox.com/en/terms
Privacy Policy: https://divetoolbox.com/en/privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly | $5.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Lifetime | $24.99 | one-time |



## Version history (last 5 releases)

### 5.3.0 — 2026-09-06

App stability improvement

### 5.2.0 — 2026-08-22

- New: Gas Blending — automatic bleed step for lean target mixes (e.g. NX32 → NX28) or when the starting pressure is above target.
- Fix: on mobile, toasts no longer hide behind the camera notch or status bar.
- Fix: on mobile, the dive sites list no longer shows up empty.

### 5.1.0 — 2026-08-19

New: Sign in with Apple — one-tap login
Favorite dive sites in a new dashboard card
Dive sites list syncs with the map — pan or zoom to filter
New "Beginner" difficulty level
Cleaner layout on tablets
Updated Terms of Service (lifetime purchase pricing)

### 5.0.1 — 2026-08-15

Bug fixes:
- CCR plans now save circuit type, CCR config and bailout tanks correctly
- Successive dive settings (previous dive, surface interval, tissues) are preserved
- Offline plans sync fully to the server when connection returns
- "Unsaved changes" prompt no longer appears right after saving

### 5.0.0 — 2026-08-12

Fish Identifier — recognise marine species from a photo
Dive Sites — community-driven database of dive spots worldwide
Travel gas support in the dive planner
Interactive Bailout Simulator (OC + CCR)
Offline mode — your saved plans are always available on the boat
One-click Sign in with Google
New Learn guide: Decompression Explained
Push notifications
Plus: tank model picker (AL80, HP100, 12 L…), sharper metric ↔ imperial handling, and lots of polish.

## Apps similar to Dive Toolbox

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Dive Kit: Deco Planner & Tools](https://appshunter.io/ios/app/dive-kit-deco-planner-and-tools/id6753089545) | 5.0 (1) | Free | Sports |
| [nDeco](https://appshunter.io/ios/app/ndeco/id6741527911) | 2.0 (1) | Free | Sports |
| [DiveHub - Multi Dive Tool](https://appshunter.io/ios/app/divehub-multi-dive-tool/id6756101582) | — | Free | Sports |
| [krakentools – TEC/REC Tools](https://appshunter.io/ios/app/krakentools-tecrec-tools/id6761906896) | — | Free | Sports |
| [Gas Blend Pro](https://appshunter.io/ios/app/gas-blend-pro/id6755033081) | — | Free | Sports |
| [mvPlan](https://appshunter.io/ios/app/mvplan/id6760315291) | — | Free | Sports |

## Related topics

[gradient sports](https://appshunter.io/ios/topics/gradient-sports)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-06.*