# Plena Biofeedback — mindfulness meets biometrics > mindfulness meets biometrics (iPhone/iPad app by Kenneth Nygren.) - Source: https://appshunter.io/ios/app/plena-biofeedback/id6756549507 (this page in markdown: same URL + `.md`) - Developer: [Kenneth Nygren](https://appshunter.io/developer/1861328307) - Category: Health & Fitness, Lifestyle - Price: Free with in-app purchases (on sale, was $9.99) - Age rating: 4+ - Requires: iOS 17.6 · 19 MB - Languages: American English - Released: 2026-02-09 - Data updated: 2026-08-31 - User reviews in markdown: https://appshunter.io/ios/app/plena-biofeedback/id6756549507/reviews.md ## What is Plena Biofeedback? Plena: The Only Mindfulness App with Stress Zones, Intentions, and Readiness Scores Start mindfulness sessions from your Apple Watch with live sensor streaming to iPhone. Set an intention before each session, see real-time stress zone classification as you practice, then reflect afterward. Track daily readiness with a score showing exactly which metrics help or hinder recovery. What Makes Plena Different - WATCH-FIRST: Start from Apple Watch with live data streaming to iPhone - STRESS ZONES: See Calm/Optimal/Elevated zones update in real-time - INTENTIONS + REFLECTIONS: Set goals before, record insights after - READINESS BREAKDOWN: Daily score with metric contributions explained - MIND-BREATH-BODY: Built on the triangle of HR, HRV, and respiration - PRIVACY-FIRST: Health data stays on your device, never shared The Triangle: Mind, Breath, Body The triangle represents the three core rhythms of human calm: - Heart Rate reflects moment-to-moment activity - HRV shows adaptability and stress balance - Breath regulates the entire system When in harmony, they create balance. That's what Plena measures in real time. Real-Time Stress Zone Classification Color-coded zones during sessions: - Calm Zone - Relaxed, low-stress state - Optimal Zone - Balanced, functioning well - Elevated Zone - Higher stress response Key Features Biometric Tracking - Heart Rate, HRV/SDNN, Respiratory Rate - Body Temperature, VO2 Max Apple Watch Integration - Start sessions directly from Watch - Live sensor sync to iPhone - Zone indicators on wrist - Works independently from iPhone Dashboard and Analytics - Session statistics, streaks, trends - Interactive graphs (Day/Week/Month/Year) - HRV insights and pattern recognition Session Flow - Pre-session intention setting - Post-session reflections - Automatic saving and summaries Readiness Score Daily score (0-100) combining Resting HR, HRV Balance, Temperature, Recovery, and Sleep. View contributor breakdowns and compare to yesterday. Privacy All data stored locally using Apple's HealthKit. No third-party sharing. Requirements - iOS 17.0+, Apple Watch Series 4+ (optional) - HealthKit permissions required Medical Disclaimer Plena is not a medical device and does not provide medical advice. Readings are for wellness purposes only. Consult healthcare professionals for medical advice. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Annual | $59.99 | per year | | Plena Premium (Monthly) | $9.99 | per month | ## Version history (last 5 releases) ### 2.3.0 — 2026-08-25 • Try Premium free for 7 days with the annual plan • Your daily HRV now comes from overnight and resting readings in Apple Health — wear your Watch to sleep for the clearest picture. Every reading shows where it came from, like "Last night" or "Earlier today" • More accurate sleep durations when both iPhone and Apple Watch track the same night • Longer Apple Watch battery life after sessions • Privacy hardening: biometric values never appear in system logs Your health data never leaves your device. ### 2.2 — 2026-06-27 Improved reliability and Watch sync. IMPROVEMENTS: - Watch sessions now reliably sync to iPhone even when backgrounded - Fixed duplicate sessions appearing in Dashboard - Improved session data persistence during background sync - Enhanced sync reliability between Apple Watch and iPhone - Better handling of sessions started on Apple Watch Bug fixes and stability improvements. Thank you for using Plena! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ### 2.1 — 2026-03-28 What's New - Apple Watch sync reliability — Sessions sync to iPhone even when the app was in the background. Late-arriving data merges into your session automatically. - Subscription syncs to Watch — Your premium status is recognized on Apple Watch immediately, including after reinstalling or first-time Watch app install. - Done button syncs — Pressing Done on either device dismisses the summary on both. - Redesigned onboarding — Fresh first-launch experience with custom visuals and Watch install guidance. - Fixed sleep data — Sleep charts now show accurate hours by filtering actual sleep stages. No more inflated bars or missing data. - Data page stability — Charts no longer disappear after switching apps. - Improved consistency chart — Clearer legend explaining bar height and zone colors. - Restore Purchases accessible from all purchase screens. - Bug fixes — Duration averages, sync timeouts, and session summary stability. ### 2.0 — 2026-03-23 Plena 2.0 — completely redesigned. • New guided onboarding that introduces your personal wellness triangle — heart rate, HRV, and breath working together • Refined visuals and smoother animations throughout • Improved Apple Watch sync experience • Performance and stability improvements ### 1.0 — 2026-02-09 No release notes. ## Apps similar to Plena Biofeedback | App | Rating | Price | Category | | --- | --- | --- | --- | | [PulseCalm: HRV Breathing](https://appshunter.io/ios/app/pulsecalm-hrv-breathing/id6771599938) | — | Free | Health & Fitness | | [Orris: Breathing Exercises](https://appshunter.io/ios/app/orris-breathing-exercises/id6749783699) | 5.0 (6) | Free | Health & Fitness | | [Coherence App](https://appshunter.io/ios/app/coherence-app/id6759622658) | — | $3.99 | Health & Fitness | | [Seedly - Male Fertility Log](https://appshunter.io/ios/app/seedly-male-fertility-log/id6760891530) | — | Free | Health & Fitness | | [YourBreath](https://appshunter.io/ios/app/yourbreath/id6754709063) | — | Free | Health & Fitness | | [Sperminal: Sperm Health](https://appshunter.io/ios/app/sperminal-sperm-health/id6762019034) | 5.0 (1) | Free | Health & Fitness | ## More apps by Kenneth Nygren - [MileTrack: Mileage & Tax Log](https://appshunter.io/ios/app/miletrack-mileage-and-tax-log/id6759682972) All apps by Kenneth Nygren: https://appshunter.io/developer/1861328307 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*