Plena Biofeedback
Kenneth Nygren Health & Fitness iPhoneiPadiPod touchApple Watch
Plena Biofeedback is a free Health & Fitness app for iPhone and iPad by Kenneth Nygren. Requires iOS 17.6. Updated September 10, 2026.
- Price
- Free
- on the App Store
- Size
- 19 MB
- Age 4+
- Updated
- Sep 10
- 2026 · v2.3.1
Screenshots
About 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/
What’s new
Version 2.3.1 · Updated September 10, 2026
This update fixes two important reliability issues: - Sessions ended while your iPhone was locked now sync reliably from your Apple Watch — previously they could be delayed or, in rare cases, lost - Premium now unlocks automatically on your Apple Watch after reinstalling the Watch app - Duplicate sessions that may have appeared in your history are automatically repaired Your health data never leaves your device.
App privacy
The developer, Kenneth Nygren, reported these privacy practices to Apple.
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Health & Fitness: Health, Fitness
Used for: App Functionality
Alternatives to Plena Biofeedback
Looking for apps like Plena Biofeedback? Here are 6 similar apps on the App Store. The highest rated is PulseCalm: HRV Breathing (5.0/5), and 5 of the 6 are free to download.
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Vela: Menopause Tracker
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Coherence App
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Plena Biofeedback | – | Free | September 10, 2026 | |
| Vela: Menopause Tracker | – | Free | Jun 8, 2026 | Compare |
| Coherence App | – | 3.99 USD | Apr 16, 2026 | Compare |
| PulseCalm: HRV Breathing | 5.0 / 5 (1) | Free | Sep 17, 2026 | Compare |
| HRVibe — Breathe & HRV | – | Free | Aug 16, 2026 | Compare |
| Mosaic Life Coach | – | Free | Aug 19, 2024 | Compare |
| Swyng: Kettlebell Workouts | 5.0 / 5 (1) | Free | Sep 29, 2026 | Compare |
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