iDeco Pro vs The O2ptimaCM Checklist
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iDeco Pro
This app is a comprehensive dive planner for technical divers, supporting both open circuit and closed-circuit rebreather (CCR) diving. It calculates decompression stops, gas usage, CNS and OTU exposure, and surface intervals. The app also includes a gas mixer for planning custom gas blends.
- Open Circuit and CCR dive planning
- Decompression stop calculation
- Gas usage and CNS/OTU tracking
- Surface interval tracking
- Gas fill/mixer functionality
- Bailout planning for overhead environments
- Configurable settings within the app
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A complete multiple dive / multi-level dive planner for the technical diver. Includes support for Open Circuit Diving as well as Closed Circuit Rebreathers (CCR). Includes decompression stops, gas usage, CNS tracking, OTU tracking, Surface Interval tracking and many other features. Currently implements the Buhlmann ZHL16/C with Erik Baker's GF algorithm. Open Circuit - Scuba : Supports Air to TriMix (any combination of O2/He/N2), with an unlimited number of decompression gases. Includes Thirds support for planning dives. Closed Circuit (CCR): Supports any O2/He/N2 combination for diluent. Automatically generates bailout plans based on entry of bailout gases. Features a Cave/Wreck bailout option for overhead environment bailouts and gas planning. Gas Fill/Mixer: Allows for filling of Air, Nitrox and Trimix via a simple, easy to use interface. All settings are configurable via the iPhone Settings. Supports US Imperial and Metric iDeco Pro vs. iDeco Pro has many features and improvements to make dive planning even easier. 1) Fully revamped user experience 2) Settings can now be changed in the app. 3) My Gases - Allows you to have a list of the 50 most used gases. Works for the dive phase, deco phase and bailout. 4) New runtime display. 5) Added much higher pressure support for mixing. 6) Superior email support - You can now view, edit and cc others on your plans. 7) Many, many more small features added. 8) Future support for many more decompression algorithms.
The O2ptimaCM Checklist
This app provides digital checklists for rebreather assembly, helping divers manage their build process. It includes countdown timers for critical breathing stages and a summary view with caution alerts for missed steps. Transition from paper to a digital format for efficient and environmentally friendly diving preparation.
- Digital rebreather assembly checklists
- Countdown timers for breathing stages
- Summary view of build progress
- Caution blocks for missed steps
- Paperless dive preparation
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The O2ptima CM Checklist app simplifies rebreather assembly with dedicated checklists mirroring the manual lists. Set precise countdown timers for Positive, Negative, and Pre-breathes. Summary view of your build with caution blocks if steps are missed. Manage your build from a simple digital checklist! Help save the planet by moving away from throw away paper every time you dive to a digital checklist in your phone or Ipad!
Screenshots
Verdict
The clearest difference is rating: The O2ptimaCM Checklist at 5.0 against iDeco Pro's 3.9. The O2ptimaCM Checklist also leads on update cadence (every 4 months vs every 18 months). iDeco Pro's advantage is in-app purchases (none vs 4) and ratings volume (10 vs 1). On ads, monetization model 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
iDeco Pro costs $8.99 and The O2ptimaCM Checklist $9.99 up front. The O2ptimaCM Checklist sells 4 one-off in-app purchases. iDeco Pro asks for nothing beyond the download.
The O2ptimaCM Checklist holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: iDeco Pro has 10 ratings behind it against 1, so its average is the more settled of the two.
iDeco Pro ships an update every 18 months, The O2ptimaCM Checklist every 4 months. The most recent releases landed on November 10, 2026 and November 7, 2026 respectively.
| Parameter | iDeco Pro | The O2ptimaCM Checklist |
|---|---|---|
| Price | $8.99 — better | $9.99 |
| Rating | 3.9 (10 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 52.0% of reviews | — |
| Number of ratings | 10 — better | 1 |
| Update frequency | Every 18 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 7.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | B2 Prototech LLC | Andrew Austin |
Customer experience
iDeco Pro
The O2ptimaCM Checklist
In-app purchases
iDeco Pro
No in-app purchases
The O2ptimaCM Checklist
- Tiny Tip$0.99
- Small Tip$1.99
- Medium Tip$4.99
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- Large Tip$9.99
Questions
Is iDeco Pro free?
Is The O2ptimaCM Checklist free?
Which has better reviews, iDeco Pro or The O2ptimaCM Checklist?
Do iDeco Pro or The O2ptimaCM Checklist have ads?
Which is updated more often, iDeco Pro or The O2ptimaCM Checklist?
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