Everything you need to measure stress. In a single app.
Stress Index is the most complete professional HRV software on the European market. Here is what you can do with it.
5 numbers. Everything clear at a glance.
You do not need to be an HRV expert to use Stress Index. The 5 proprietary scores give you an instant snapshot of your client: how stressed they are, how they recover, whether the nervous system is in balance, how much energy they have and how well they adapt to load.
Stress Index
0-100How much pressure the nervous system is under. Based on 5 weighted parameters: Baevsky Stress Index, SDNN, Total Power, DFA Alpha1, HF norm.
Recovery
0-100The parasympathetic system’s capacity to regenerate. If it stays low over time, the client is not recovering between sessions.
Balance
0-100The sympathetic-parasympathetic balance. Higher is not better here. The optimal value sits in the middle.
Energy
0-100The nervous system’s overall energy resources. Based on the total power of the spectrum.
Adaptation
0-100The autonomic nervous system’s capacity to recover and adapt to everyday demands. Unique on the market.
25+ HRV parameters. The whole literature, always with you.
For the professional who wants to go deeper, Stress Index computes every parameter validated by the scientific literature.
Time domain
- RMSSD
- SDNN
- Mean HR
- pNN50
- pNN20
- HRV-CV
- RMSSD/SDNN
Frequency domain
FFT Welch + Lomb-Scargle
- LF Power
- HF Power
- VLF Power
- Total Power
- LF/HF
- LF norm
- HF norm
Non-linear
- DFA Alpha1
- DFA Alpha2
- SD1
- SD2
- SD1/SD2
- Sample Entropy
- Approximate Entropy
Geometric
- Stress Index Baevsky
- Triangular Index
- TINN
A test for every need. From the standard protocol to the long session.
Four measurement modes designed to cover 100% of situations in the practice and in the field.
Standard Measurement
A snapshot of the current state. 5 or 10 minutes, seated or lying down. You will run 70% of your assessments with this one.
Orthostatic Test
Measures the reactivity of the nervous system. 5 minutes lying down, then 5 minutes standing. The app guides the transition with sound and vibration. Perfect for slow recoverers, persistent fatigue and overtrained athletes.
Coherence Breathing
Animated visual guide for breathing. Find your client’s personal resonance rate. Real-time coherence score. Ideal when you work on relaxation, sleep quality and tension management.
Long Sessions
NewOpen-ended duration to measure during your sessions. Real-time tags, analysis every 2 minutes, automatic before/after comparison. Show your clients that the session works, with data.
Do you work with athletes? There is a dedicated module with real-time DFA Alpha1 and live metabolic zones. Discover the Sport Module →
A professional PDF. Ready in the session.
A 4-page PDF you can print, email or show the client during the session. It includes every score, the detailed parameters, the HRV charts (Poincaré, rhythmogram, PSD spectrum) and the legal disclaimer. Customizable with your name, title and practice.
- Custom header with your name, title and practice
- 5 proprietary scores with a color bar chart
- 25+ HRV parameters with reference ranges and traffic light
- HRV charts: Poincaré, RR rhythmogram, PSD spectrum
- Legal disclaimer and traceable generation
Your clients, organized. In one place.
Manage all your clients in one place. Full profile, measurement history, session comparison, professional notes. Everything synced between the app and the web dashboard.
Not just an app. On your computer too.
Access your clients’ data from your computer at stressindex.io. Interactive charts, trends over time, automatic alerts, periodic PDF reports. Perfect when you are at the desk in your practice.
- Interactive charts with dual Y axis
- 30 / 60 / 90-day trends
- Automatic alerts on stress and recovery
- Periodic PDF reports with automatic commentary
- Full CRM accessible from the browser
Privacy guaranteed. By law.
Your clients’ sensitive data is protected by the strictest European regulation. No hidden tracking, no third parties, no surprises.
Servers in Europe
Data center in Frankfurt, Germany.
GDPR compliant
Consent recorded for every client.
Encryption
Data encrypted in transit and at rest.
No sharing
Data never leaves Europe. Ever.
Works with your strap. Or with the one we recommend.
No proprietary hardware. Stress Index connects over Bluetooth to the main heart rate sensors on the market.
| Sensor | Status |
|---|---|
| Polar H10 (€90.00) | Compatible |
| Polar H9 (€50.00) | Compatible |
| Polar OH1 / Verity Sense | Compatible |
| Wahoo TICKR | With limits |
| CooSpo H808S | With limits |
| Whoop 4.0 | Not compatible |
| Garmin straps (HRM-Dual, HRM-Pro) | Not compatible |
| Apple Watch | Not compatible |
Try Stress Index free for 60 days.
Every feature. No commitment. Cancel anytime.
Credit card required · No charge for 60 days · Cancel anytime