Aer vs Breathwrk: a CO2-calibrated alternative If you are looking for a Breathwrk alternative, the practical difference is personalization. Aer calibrates every exercise to your measured CO2 tolerance, then keeps a hedged, non-clinical tone. Here is an honest, sourced comparison.
Aer is a Breathwrk alternative that calibrates each breathing exercise to your measured CO2 tolerance and adds on-device Apple Watch heart-rate tracking, with hedged, non-clinical guidance.
Aer calibrates pacing to your measured CO2 tolerance from a baseline test; Breathwrk personalizes by lungs, goals, and time of day, without a CO2 measurement. Aer reads heart rate live on Apple Watch and keeps it on the device; Breathwrk integrates with Apple Health but has no dedicated Apple Watch app. Aer keeps a hedged, non-clinical tone; Breathwrk makes stronger clinical claims on its science page. Last reviewed 9 Jun 2026
Feature Aer Breathwrk CO2-tolerance personalization [breathwrk.com] Calibrates exercises to your measured CO2 tolerance from a baseline test Personalizes by lungs, goals, and time of day; no CO2-tolerance measurement Heart-rate tracking [App Store] Live heart rate on Apple Watch, kept on the device Apple Health and HRV integration, but no dedicated Apple Watch app Claim style [breathwrk.com/science] Hedged, non-clinical guidance Stronger clinical claims on its science page Pricing [breathwrk.com] 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 .