Comparison

iDeco Pro vs The O2ptimaCM Checklist

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • Digital rebreather assembly checklists
  • Countdown timers for breathing stages
  • Summary view of build progress
  • Caution blocks for missed steps
  • Paperless dive preparation
Features
Read full description

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

iDeco Pro4 screens
The O2ptimaCM Checklist4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
iDeco Pro versus The O2ptimaCM Checklist: the parameters behind the verdict, then further details
ParameteriDeco ProThe O2ptimaCM Checklist
Price$8.99 — better$9.99
Rating3.9 (10 ratings)5.0 (1 ratings) — better
Positive reviews52.0% of reviews—
Number of ratings10 — better1
Update frequencyEvery 18 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS7.0 — better17.0
Further details — not scored
Size3 MB2 MB
Age rating4+4+
DeveloperB2 Prototech LLCAndrew Austin

Customer experience

iDeco Pro

All ratings10 ratings
Positive70.0%
Neutral10.0%
Negative20.0%
Written reviews100 reviews
Positive52.0%
Neutral17.0%
Negative31.0%

The O2ptimaCM Checklist

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

iDeco Pro

No in-app purchases

4 purchases

The O2ptimaCM Checklist

One-time4
  • Tiny Tip$0.99
  • Small Tip$1.99
  • Medium Tip$4.99
Show 1 more
  • Large Tip$9.99

Questions

Is iDeco Pro free?
iDeco Pro costs $8.99, with no in-app purchases.
Is The O2ptimaCM Checklist free?
The O2ptimaCM Checklist costs $9.99, and also offers in-app purchases.
Which has better reviews, iDeco Pro or The O2ptimaCM Checklist?
The O2ptimaCM Checklist is rated higher. iDeco Pro averages 3.9 out of 5 from 10 ratings, while The O2ptimaCM Checklist averages 5.0 from 1 ratings.
Do iDeco Pro or The O2ptimaCM Checklist have ads?
Neither iDeco Pro nor The O2ptimaCM Checklist shows ads.
Which is updated more often, iDeco Pro or The O2ptimaCM Checklist?
iDeco Pro ships an update every 18 months, and The O2ptimaCM Checklist every 4 months. Most recently, iDeco Pro was updated on November 10, 2026 and The O2ptimaCM Checklist on November 7, 2026.

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