Praenox reads your HRV, sleep architecture, and stress — then generates a therapeutic soundscape engineered for your exact physiological state. Not generic. Not approximate. Yours.
112 nights tracked. 4+ years of Zepp baseline versus what happened after Praenox started. No cherry-picking.
Free reacts to today. Pro learns your patterns, detects chronic deficits, and acts before the decline starts.
| Feature | Free | Pro |
|---|---|---|
| Biometric fingerprint synthesis | ✓ | ✓ |
| 6 biometric protocols | ✓ | ✓ |
| MP3 export | ✓ | ✓ |
| Personal baseline calibration | ✓ | ✓ |
| Progress charts & day comparison | ✓ | ✓ |
| Long-term pattern detection | ✗ | ✓ |
| Fusion engine (predictive) | ✗ | ✓ |
| Stability Mode | ✗ | ✓ |
| Sleep Debt Gate | ✗ | ✓ |
| HRV Velocity tracking | ✗ | ✓ |
| Streaks, shields & milestones | ✗ | ✓ |
| Price | Free | One-time · lifetime |
Free reacts to each day in isolation. Pro learns your trajectory — it knows when your HRV is falling before you feel it, and forces the right protocol before decline arrives.
Why Free changes protocols daily, what Pro actually learns, and how Fusion, Sleep Debt and streaks work. Switch tabs to see each plan's answers.
The free version has no persistent Stability Mode and no Sleep Debt detection. It looks only at the health data you entered for that specific day — HRV, resting heart rate, deep sleep %, REM %, stress.
It then picks the protocol based on which single metric is furthest below your personal baseline (e.g. HRV too low → Parasympathetic Restore, deep sleep too low → Delta Induction, stress too high → Cortisol Reset).
Because your daily biometrics naturally fluctuate, the "worst metric" often changes day to day. The app is not broken — it is faithfully reflecting your daily variability.
Yes, but only your personal baselines, not behavioural patterns. It continuously updates your normal HRV, resting HR, typical deep sleep %, REM % and stress using all saved days, then uses them to calculate each new day's deficit.
What it does not do:
No. There is no spike-smoothing rule. If your HRV jumps from 50 ms to 80 ms overnight, the protocol for that day is based on the new value directly.
There is no "stable mode" that locks you into a single protocol for several days. If the protocol changes often, it's because your biometrics themselves are oscillating — the free version simply shows you that truth.
No, it's working as designed. The free version doesn't analyse chronic conditions — it reacts to each day's data independently.
High stress one day, low REM the next, good recovery the third produces Cortisol Reset → REM Restore → Maintenance. That's not a loop — it's a reflection of your changing state. To respond to underlying patterns instead of daily noise, that's what Pro was built for.
Six protocols, automatically selected from your biometric fingerprint:
The protocol label appears in the "Analysis" panel after generation.
Yes — try two things:
If you want the engine to learn and stop jumping, that's exactly what the paid version was designed for.
Not at all. The free version is excellent for understanding how your daily biometrics shape a therapeutic soundscape, experimenting with palettes and styles, and getting a fresh, data-driven session every night.
It just isn't designed to target chronic patterns or stabilise your protocol over time. For that, you'd need Pro.
No, it's working as designed. The app has learned your baselines and is now focusing on your most persistent issue. Priority order, highest to lowest:
If your sleep is regularly shorter than your baseline, the Sleep Debt Gate opens and forces "Sleep Debt Delta Recovery" until you catch up — three consecutive sufficient nights close the gate.
Fusion sits on top of the priority system. It can force a protocol in Stage 2 or 3 when an Act risk is detected, but it never bypasses Sleep Debt or Stability Mode.
Fusion prevents tomorrow's failure. Sleep Debt addresses today's deficit.
Stage 3 sub-labels by accuracy: < 55% → Calibrating, 55–69% → Tuning, ≥ 70% → Predictive.
Open Charts → "Your Optimal Sleep" card. It shows your personal baseline (e.g. 442 min) and confidence level (Low / Medium / High). This comes from your own history — not a fixed 7-hour rule.
They differ when your baselines improve over time. Both are correct — just different reference frames.
To protect the soundscape linked to that date. Locked fields become read-only and the delete button is disabled.
You can edit a locked day (confirmation required), but only future generations use the new values — the existing soundscape keeps its original snapshot forever.
Export awards points immediately and creates a pending confirmation in Milestones.
Preventive sessions (Fusion Stage 2+) use +13 listened, −8 skipped.
Shields — earn one shield every 7 streak days (max 2). If you miss 2+ days without opening the app, a shield automatically fires and your streak survives. You do nothing. The shield_user badge unlocks on first shield use.
The missing label at 40–55% is intentional — no more days are needed, you just need to keep marking LISTENED until accuracy climbs above 55%.
The other protocols (Cortisol Reset, REM Restore, Cardiac Calm, Maintenance) aren't gone — they're lower priority. To see them, sleep enough: 7 consecutive days with sleep ≥ your personal baseline (shown in Charts → Sleep Optimiser).
Once the Sleep Debt Gate closes, the engine cycles through the other protocols based on your daily fingerprint.