Gas Blender Toolkit vs CCRtools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gas Blender Toolkit
This comprehensive toolkit assists scuba divers in calculating and blending various gas mixtures like trimix, nitrox, and heliox. It offers features for both partial pressure and continuous blending, cost calculation, and utilizes ideal and real gas models for accuracy. Optimized for larger screens, it serves as a successor to a previous diving application.
- Partial pressure blending
- Continuous blending
- Trimix, nitrox, heliox calculations
- Ideal and real gas models
- Cost calculation
- Top off from storage
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Gas Blender Toolkit is a comprehensive, purpose-built calculator for technical and recreational scuba divers who blend their own breathing gases. FUNCTIONS • Partial-pressure gas blending with freely configurable fill order • Continuous / delta-gas blending method • Decanting from a storage bank, with calculation of the number of possible fills • MOD / END tables for standard scuba gases • pSCR loop oxygen-reduction calculation at constant volume ratio • CCR rebreather diluent END calculator for any depth and chosen PPO2 setpoint FEATURES • Real gas (Van der Waals) or ideal gas calculations • Cost calculation for each gas fill • Fully customizable standard gas list • Accounts for gas heating during filling • Clean, fast and easy to use • Available in English, German, Russian and Spanish Gas Blender Toolkit is the completely rewritten successor to the DIR-Wetnotes app, redesigned from the ground
CCRtools
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CCRtools is application for closed-circuit rebreather (CCR) divers. CCRtools helps you prepare for dives safely with checklists, gas blending calculations, O₂ sensor tracking, and standard diving calculators. Checklists can be downloaded, created or modified and can contain checks, values to enter and timers. The sensor log supports up to five O₂ sensors displaying the trend of linearity.
Screenshots
Verdict
The clearest difference is price: CCRtools at Free against Gas Blender Toolkit's $2.99. Gas Blender Toolkit's advantage is iOS requirement (15.0 vs 18.2). On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
CCRtools is free to download; Gas Blender Toolkit costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Gas Blender Toolkit ships an update every 9 days, CCRtools fortnightly. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.
| Parameter | Gas Blender Toolkit | CCRtools |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 9 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.2 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Oleg Gurevich | Kai-Uwe Sattler |
In-app purchases
Gas Blender Toolkit
No in-app purchases
CCRtools
No in-app purchases
Questions
Is Gas Blender Toolkit free?
Is CCRtools free?
Do Gas Blender Toolkit or CCRtools have ads?
Which is updated more often, Gas Blender Toolkit or CCRtools?
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