Evidence
Every claim we make is tied to a source. Here's our evidence base, with dates, scope, and limitations.
Last reviewed: February 23, 2026
“27,500+ users”
- Source:
- Internal analytics (App Store Connect + Google Play Console)
- Date:
- February 2026
- Scope:
- Cumulative downloads across iOS and Android
- Notes:
- Includes free and paid users. Does not deduplicate cross-platform installs.
“4.8★ app rating”
- Source:
- Apple App Store
- Date:
- February 2026
- Scope:
- All-time weighted average across all App Store regions
“64% 30-day retention”
- Source:
- Internal analytics (Mixpanel cohort analysis)
- Date:
- January 2026
- Scope:
- Percentage of users who opened the app at least once within 30 days of install
- Notes:
- Based on cohorts from Q4 2025. Retention varies by acquisition channel.
“Available in 15+ countries”
- Source:
- App Store Connect & Google Play Console territory reports
- Date:
- February 2026
- Scope:
- Countries with at least 10 active users
“Box breathing reduces stress and improves focus”
- Source:
- Ma et al., 'The Effect of Diaphragmatic Breathing on Attention, Negative Affect and Stress in Healthy Adults,' Frontiers in Psychology, 2017
- Date:
- 2017
- Scope:
- Randomized controlled trial, 40 participants, 8-week intervention
- Notes:
- Study used diaphragmatic breathing (similar mechanic to box breathing). Effect sizes were moderate.
“4-7-8 breathing activates the parasympathetic nervous system”
- Source:
- Vierra et al., 'Effect of Slow Paced Breathing on Cardiovascular Function,' Psychophysiology, 2022
- Date:
- 2022
- Scope:
- Meta-analysis of slow-paced breathing interventions on autonomic function
- Notes:
- Extended exhale patterns consistently show parasympathetic activation across multiple studies.
“Physiological sigh is the fastest real-time stress reduction technique”
- Source:
- Balban et al., 'Brief structured respiration practices enhance mood and reduce physiological arousal,' Cell Reports Medicine, 2023
- Date:
- 2023
- Scope:
- Randomized controlled trial, 108 participants, daily 5-minute interventions over 1 month
- Notes:
- Cyclic sighing outperformed mindfulness meditation on mood and respiratory rate reduction.
“Vagus nerve stimulation via breathing reduces inflammation”
- Source:
- Gerritsen & Band, 'Breath of Life: The Respiratory Vagal Stimulation Model of Contemplative Activity,' Frontiers in Human Neuroscience, 2018
- Date:
- 2018
- Scope:
- Review article synthesizing research on respiratory vagal stimulation
- Notes:
- Theoretical model supported by convergent evidence from multiple studies.
“HRV improves with regular breathwork practice”
- Source:
- Lehrer & Gevirtz, 'Heart Rate Variability Biofeedback: How and Why Does It Work?,' Frontiers in Psychology, 2014
- Date:
- 2014
- Scope:
- Review of HRV biofeedback mechanisms across clinical and healthy populations
