Aer vs the Othership app: a CO2-calibrated alternative This compares Aer with the Othership Guided Breathwork app, not Othership’s physical sauna and ice-bath spaces. If you want a breathwork app that adapts to you, the practical difference is personalization: Aer calibrates every exercise to your measured CO2 tolerance. Here is an honest, sourced comparison.
Aer is an alternative to the Othership breathwork app that calibrates each exercise to your measured CO2 tolerance and adds on-device Apple Watch heart-rate tracking.
Aer calibrates pacing to your measured CO2 tolerance; the Othership app offers categorized preset sessions without CO2 calibration. Aer reads heart rate on Apple Watch and keeps it on the device; the Othership app only writes Mindful Minutes to Apple Health, with no heart-rate feature. Both apps use responsibly hedged, non-clinical language. This comparison is with the Othership app, not Othership’s physical sauna and ice-bath locations. Last reviewed 9 Jun 2026
Feature Aer Othership (app) CO2-tolerance personalization [othership.us/app] Calibrates exercises to your measured CO2 tolerance Categorized preset sessions; no CO2-tolerance calibration Heart-rate tracking [App Store] Live heart rate on Apple Watch, kept on the device Writes Mindful Minutes to Apple Health; no heart-rate feature Claim style [othership.us/app] Hedged, non-clinical Also hedged, non-clinical Pricing [othership.us/app] See our current plans Billed annually or monthly; see current pricing (checked 9 Jun 2026)
This page is for informational purposes only and is not medical advice. Breathwork that involves fast breathing or breath holds can make you feel lightheaded or faint, so stop if you feel dizzy. If you are pregnant or have a cardiovascular, respiratory, or seizure condition, talk to a clinician before trying these techniques. See our full disclaimer .