iPhone Screenshots


STAmina is created by and for freedivers with the ultimate purpose to improve your freediving skills by increasing the breath-holding time. STAmina is all about O2 deprivation and CO2 tolerance tables. It allows you to configure the tables to correspond to your skill level. It leads you through a workout with visual and voice notifications and tracks the history of your workouts.

CO2 tolerance tables
O2 deprivation tables
Mix tables
Wonka tables
Custom tables
Tables Generator
Male/Female voice notifications
Training notifications
Unlimited workout log
Personal best tracking and history
Workout statistics

What’s New

Version 2.0.9

You do incredible things and you should be proud. Let the world know about it! In this update, we are introducing the sharing feature.

Ratings and Reviews

4.9 out of 5
630 Ratings

630 Ratings

dootph ,

Great app!

UPDATE: The developer contacted me in a very timely manner and helped me resolve the issue. Which was that the ringer on the left side of the phone was in the silent position. Now I have the voice and will update the rating to 5 stars as I find the app very useful. I would love to see an upgrade at some point that will allow to hear the app’s voice even with the ringer in silent position though, as I don’t want to be interrupted by any phone calls during my training! Thanks for taking this request into account.

Original review: 3 stars - the app appears to be completely silent, although I set a voice and beeping in Settings. It is difficult to watch the time during all the training and I want to make sure I have the voice activated. I already rebooted my phone and did everything I could to ensure it’s working, but no success. And I can’t find how to contact developer with this questions. Thanks for looking into it.

Developer Response ,

Thanks for the review! In the latest version (1.9.8) the app's voice should work even with the ringer in silent position.

Woodsra ,

Help!! Update broke my app

Awesome app, and awesome response from the developer after a patch had unexpected bugs. Following this post, the developer corrected the issue within 48 hours. Highly recommended app for anyone working on breath hold training.

I am running iOS 10.3.1, upgraded to the new Apnea app today and now my app won't work. I go to start a table training and the familiar circle appears, but there is no data in the boxes and the timer doesn't work. I have restarted my phone, closed the app multiple time and still nothing.

Developer Response ,

Thanks for your patience, I'm glad you enjoy the app!

captain AppleBoy ,

Works fine once learned. Needs some improvement.

It took me a while to figure out some of the arcane intricacies, but once I figured it out it wasn’t that big a deal— an introductory howto walk-through, or even just a video, would be nice for those who are newcomers to the whole scene here. Now that I know how things work, I find one feature sorely missing: iCloud synchronization. I have multiple devices, and sometimes I want to use one instead of the other, but all of my data seems stuck on each isolated device completely oblivious to the others. Also, it would be nice to have some volume control over each individual alert: e.g. I would like to have a LOUD final alert, that I can hear while floating head down under water, but I would like the “every 15 seconds beeps“ to be relatively soft, yet not completely turned off.


Squarecrowd Apps SIA
124.8 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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