# DeepBreath: Apnea & CO2 Tables — user reviews

> 4 indexed App Store user reviews of DeepBreath by James Montgomery Design Inc., rated 5.00/5 from 2 ratings.

- Source: https://appshunter.io/ios/app/deepbreath-apnea-and-co2-tables/id6759741699/reviews
- App overview in markdown: https://appshunter.io/ios/app/deepbreath-apnea-and-co2-tables/id6759741699.md
- Rating breakdown: 5★ 2 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 0

## Most critical reviews (4 lowest-rated)

### 5/5 — Cut my air consumption on every dive

*2026-05-06*

The Air Save mode is a 1:2 inhale-to-exhale trainer and it genuinely improved my SAC rate. Practiced 10 minutes a day for two weeks before a liveaboard and my air lasted noticably longer on every dive. The breathing circle and phase beep keep you on cadence perfectly. Runs continuously with no round limit. Simple concept,gets results.

### 5/5 — Not a diver but I love this

*2026-04-18*

I don't dive at all but my freediver friend wouldn't shut up about this app so I tried it. The Box Breathing mode is amazing for anxiety. I use it before meetings and before bed. The circle animation is calming, the haptic taps keep me in rythm, and there's a little sea creature that swims around while you train which is a fun thing to unlock and keep me consistent. Simple, beautiful, works.

### 5/5 — Invaluable

*2026-04-10*

I’ve just gotten into freediving and found the whole breathing part really intimidating (because I was rubbish at it!). I’ve since improved so much and I have this app to thank for it. Daily practice is a must and DeepBreath makes that easy and fun that I actually want to practice! Thank you!!

### 5/5 — Helpful to get back into diving after some time off

*2026-03-26*

I’ve found this app really helpful to prepare for getting back into diving after years away from proactively diving for recreation and work

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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 2026-08-07.*