The Science Your Voice
Can't Hide.
Your voice carries 151+ involuntary biomarkers — physiological signals embedded in your acoustic signature that reveal stress, confidence, and emotional truth. Backed by 28 years of research. Validated by 9 universities. Deployed across 7 continents.
Researched & Validated By
This Is Not What You Think It Is.
Most "emotion AI" guesses what you feel from your words. REWRITE measures what your nervous system is actually doing — using technology trusted by investigators, insurers, and security agencies in 140+ countries.
Not Sentiment Analysis
We don't guess emotion from words. Our engine measures involuntary vocal biomarkers — physiological signals the speaker cannot fake or suppress.
Not Tone Detection
Tone-based AI reads surface cues. Emotion Logic reads the nervous system's response embedded in the acoustic signature of the voice.
Not AI Guesswork
No LLM hallucinations. No training bias. LVA is a deterministic, signal-processing system grounded in 28 years of psychoacoustic research.
Layered Voice Analysis (LVA) Technology
When you speak, your vocal cords, breath patterns, and articulatory muscles produce acoustic patterns that bypass conscious control. Stress constricts your throat. Confidence steadies your pitch. Cognitive overload slows your speech and fills it with micro-hesitations.
Emotion Logic's proprietary LVA7 engine extracts these involuntary signals with sub-200ms latency. Unlike AI models that learn from labeled data (and inherit human bias), LVA is a deterministic acoustic analysis system — it measures the physics of your voice, not the meaning of your words.
This is why it works in every language, dialect, and accent. Vocal biomarkers are pre-linguistic. They exist before words form. A stressed voice in Mandarin carries the same acoustic signatures as a stressed voice in English — because the nervous system doesn't speak a language.
"Emotions speak louder than words."
— Emotion Logic
The Emotional Diamond Profile
Every voice segment is analyzed across four core axes, creating a multidimensional emotional profile that captures what's really happening beneath your words.
⚡ Energy
Vitality and emotional activation. High energy signals engagement, passion, and drive. Low energy may indicate withdrawal, fatigue, or emotional suppression.
🔓 Willingness
Openness to change and new perspectives. Measures how receptive you are in the moment — critical for coaching breakthroughs and real behavioral shifts.
🔴 Stress
Tension, pressure, and fight-or-flight activation. Vocal cord tension and pitch variability reveal emotional stress your words may be masking.
❓ Uncertainty
Doubt, hesitation, and unresolved processing. Micro-pauses, filler patterns, and prosodic instability signal topics your mind is still wrestling with.
Plus dozens of sub-indicators including cognitive load, authenticity markers, emotional congruence, and arousal signals.
From Voice to Intelligence
Four steps transform raw audio into actionable emotional intelligence — in under 200 milliseconds.
Capture
You speak to your AI coach. Audio is captured securely via your device's microphone.
Extract
The LVA7 engine extracts 151+ involuntary vocal biomarkers from the acoustic signal.
Analyze
Biomarkers map to an Emotional Diamond Profile — Energy, Willingness, Stress, Uncertainty.
Insight
Your daily Voice Insight card reveals patterns your words couldn't express.
What REWRITE Measures
We translate Emotion Logic's clinical biomarker data into five human-readable dimensions — so you don't need a PhD to understand your own voice.
| You See | What It Measures | Why It Matters |
|---|---|---|
| 😰 Stress | F0 variability, vocal cord tension, sympathetic nervous system activation | Reveals which topics trigger your fight-or-flight — even when you say "I'm fine" |
| 💪 Confidence | Pitch stability, declarative intonation, speech rate consistency | Shows where you trust yourself and where doubt is creeping in |
| 🎯 Engagement | Energy levels, vocal variety, response latency, arousal markers | Distinguishes genuine interest from going through the motions |
| 🧠 Cognitive Load | Speech rate changes, pause duration, filler frequency, micro-hesitations | Maps which decisions came easily and which your brain is still wrestling with |
| ✨ Authenticity | Emotional congruence, prosodic naturalness, incongruence detection | Tells the difference between insights you've intellectualized and insights you've felt |
Deep Dive: Emotional Stress
Fundamental Frequency Variation Reveals Fight-or-Flight States
When you're under emotional stress, your sympathetic nervous system activates. Your vocal cords tense. Your fundamental frequency (F0) — the base pitch of your voice — shifts in ways you cannot consciously control.
Research shows that increased F0 variability and upward pitch shifts correlate strongly with anxiety, fear, and emotional arousal. REWRITE tracks these micro-variations across every coaching conversation, building a stress profile that reveals what topics trigger your fight-or-flight response — even when your words say "I'm fine."
Deep Dive: Cognitive Load
Speech Rate Changes and Filler Patterns Expose Overthinking vs. Flow
When your brain is working hard — processing a difficult decision, weighing conflicting emotions, or constructing a narrative that doesn't quite fit — your speech changes. You slow down. Pauses lengthen. Filler words ("um," "uh," "like") multiply.
These aren't signs of poor communication. They're signs of cognitive effort. REWRITE measures speech rate, pause duration, and filler frequency to map your cognitive load across topics. When you're in flow — speaking freely and authentically — the patterns are unmistakable.
Deep Dive: Authenticity
Emotional Congruence Distinguishes Rehearsed from Real
There's a measurable difference between speaking from a script and speaking from the heart. Rehearsed speech is smoother, more monotone, and emotionally flatter. Authentic speech has natural variation — small hesitations, emotional coloring, and prosodic shifts that align with content.
REWRITE measures emotional congruence: does your vocal emotion match what you're talking about? When someone describes a painful memory in a flat, detached voice, that incongruence is a signal. When someone discovers a genuine insight, the vocal shift is unmistakable — pitch lifts, pace quickens, energy rises.
Proven at Enterprise Scale
"We achieved 800% ROI during the pilot. FeelGPT did the job of 8 people at the price of one."
Emotion Logic's technology is trusted by insurance companies, Fortune 500 corporations, government security agencies, and healthcare organizations across 140+ countries. REWRITE brings this same clinical-grade technology to personal growth — for the first time.
Enterprise-Grade Trust & Security
The same compliance standards that protect Fortune 500 data protect your voice.
Voice recordings are processed and deleted within 24 hours. Only aggregated biomarker scores are stored. Raw audio is never shared with coaches or third parties. Read our full Privacy Policy →
How Biomarkers Feed Your Coaching
The biomarker data feeds directly into your AI coach. When the coach notices your stress spike while discussing your career, it doesn't ask "Are you stressed?" — it asks the question your voice says you need to hear.
"This isn't surveillance. It's a mirror."
Every day, REWRITE gives you a Voice Insight card — a single, focused observation about what your voice revealed. Over 30 days, these cards build into a complete Voice Arc: a biomarker trend line showing your emotional landscape over time — what you're avoiding, where you're growing, and the moments where real change happened.
After Day 30, your Voice Journey continues with daily prompts that deepen the data. The longer you stay, the more valuable your Voice Arc becomes. A 60-day arc reveals more than 30. A 90-day arc reveals patterns you'd never see otherwise. This is the Oura Ring for the Mind™ — except it gets smarter the longer you use it.
Hear What Your Voice
Has Been Trying to Tell You.
Start a free coaching conversation. Speak naturally. See what 151+ vocal biomarkers reveal about the decisions you're facing right now.
Try It Free →Free for 3 days. No credit card required. Voice data processed and deleted within 24 hours.