US National Center for Telehealth & TechnologyFree DoD-built diaphragmatic-breathing app for stress and PTSDEvidence-based assessment
Breathe2Relax review
Updated 2026-06-29
5.5
/ 10
Best evidence-backed free breathwork app — built by US military telehealth for PTSD and stress; clinical credibility no other free app matches.
Best for users wanting evidence-backed diaphragmatic breathing at zero cost — especially in clinical / PTSD / stress-management contexts.
Breathe2Relax is the US Department of Defense / National Center for Telehealth & Technology free diaphragmatic-breathing app, originally developed for veteran PTSD and combat-stress management. Clinical-credibility framing no other free app matches — published validation studies on PTSD and stress outcomes. Library is narrow (diaphragmatic / paced breathing focused), UX is dated, but the evidence base is unmatched at zero cost.
How we tested: Evidence-based assessment — scored from Breathe2Relax App Store / Play Store listings, US National Center for Telehealth & Technology documentation, and published validation studies. Not hands-on tested by ONDA.
Narrow library — focused on diaphragmatic and paced breathing for stress / PTSD context. Not a content platform.
Technique coverage
4.5
Diaphragmatic and paced breathing only. No Wim Hof, holotropic or broader technique coverage.
Evidence grounding
8.5
Built by US National Center for Telehealth & Technology with published validation studies on PTSD and stress outcomes. Best evidence base of any free breathwork app.
App experience
5.0
Dated UI from original government-build era. Functional but lacks 2026-tier polish.
Biofeedback and integration
4.0
No HRV. Basic session tracking.
Value
9.5
Completely free with no premium tier. Unbeatable value for the evidence base.
Pros
+Best evidence base of any free breathwork app — published PTSD / stress validation
+Completely free with no subscription or ads
+Built by US Department of Defense / National Center for Telehealth
+Clinical credibility no consumer app matches at zero cost
Cons
−Dated UI from original government-build era
−Narrow technique scope — diaphragmatic / paced breathing only
−No HRV or modern biofeedback
−No content library or ongoing development
Price: $0 completely free; no premium tier (as of 2026-05-28)
Where it leads
Breathe2Relax is the evidence-backed free breathwork reference — built by the US National Center for Telehealth & Technology with published validation studies on PTSD and combat-stress outcomes. Clinical credibility no consumer-built free app matches.
Where it falls short
UX and scope. Breathe2Relax is built for a specific clinical purpose (diaphragmatic breathing for stress and PTSD); the UI is dated, the library is narrow, and the app is no longer actively iterated. It's a free tool with a clinical thesis, not a 2026 content platform.
Who it is for
Choose Breathe2Relax if you want evidence-backed free diaphragmatic breathing — especially in clinical, PTSD or stress-management contexts. For curated library, Breathwrk. For modern free UI, iBreathe. For Android customisation, Prana Breath.
