# REZET - Nervous System Toolkit — Physiological Anxiety Relief > Physiological Anxiety Relief (iPhone/iPad app by MARTIN TESAR.) - Source: https://appshunter.io/ios/app/rezet-nervous-system-toolkit/id6759931581 (this page in markdown: same URL + `.md`) - Developer: [MARTIN TESAR](https://appshunter.io/developer/1867994856) - Category: Health & Fitness, Lifestyle - Price: Free - Age rating: 4+ - Requires: iOS 15.1 · 35 MB - Languages: English - Released: 2026-03-11 - Data updated: 2026-06-27 - User reviews in markdown: https://appshunter.io/ios/app/rezet-nervous-system-toolkit/id6759931581/reviews.md ## What is REZET? What feels strongest right now? Is your heart racing? Is your chest tight? Are your thoughts looping? REZET is a physiological toolkit, not a meditation app. It acts as an emergency brake for an overactive autonomic nervous system. When you experience acute stress, panic, or overwhelm, your biology is stuck in a sympathetic (fight-or-flight) or dorsal vagal (freeze) response. REZET provides you with the exact, science-backed respiratory protocols needed to mechanically stimulate your vagus nerve and force a physiological state shift back to baseline. No spiritual fluff. Just clinical mechanics. Select your current somatic state, and follow the visual and haptic pacing. NEW: MEASURE VITALS Use the rear camera and flash for a dedicated 1-minute fingertip reading. A live camera preview helps you place your finger correctly, the measurement starts automatically once pulse lock is stable, and REZET processes the full capture window to estimate: • HRV • Heart rate • Breathing rate Breathing rate is inferred from cyclical heart rate changes during the measurement. Vitals are provided for wellness trends and self-awareness only, not diagnosis or medical monitoring. NEW: CUSTOM BREATHING PROTOCOLS Create and save your own breathing protocols with custom inhale, exhale, and optional hold timings. You can choose whether a session ends by total time or by completed rounds, then restart saved custom protocols in one tap from Home. THE PROTOCOLS: We map your acute symptoms to precise respiratory ratios designed to counteract them via heart rate variability (HRV) and vagal tone manipulation. • Tachycardia (Heart Racing): 4-7-8 pacing directly stimulates the vagus nerve, utilizing breath retention to trigger a rapid parasympathetic response and lower heart rate. • Chest Tension: 4-4-4-4 (Box Breathing) anchors the autonomic nervous system through equal respiratory distribution, preventing hyperventilation and releasing physical constraint. • Racing Thoughts: Micro-varied interval pacing demands active cognitive tracking, disrupting Default Mode Network (DMN) loops. • Sensory Overwhelm: Extended exhalations mechanically decrease heart rate via respiratory sinus arrhythmia (RSA), signaling biological safety to the brainstem. • Dorsal Shutdown (Numbness): 6.0/6.0 coherent pacing gently up-regulates the system without triggering an adrenaline spike. • Restlessness: 5.5s Resonant Frequency synchronization maximizes HRV, bringing the cardiovascular and respiratory systems into perfect alignment to clear cognitive fog. SYSTEM FEATURES: • Zero Friction: No long intro videos, no mandatory sign-ups. Immediate access to physiological regulation in two taps. • Measure Vitals: A guided 1-minute camera reading for HRV, heart rate, and breathing rate estimates using the rear camera and flash. • Custom Protocols: Create, save, and restart your own breathing sessions with custom timings and time-based or round-based targets. • Clinical Insights: Detailed neurological and biological mechanics explaining why each protocol is effective. • Haptic & Visual Pacing: A high-contrast adaptive interface combined with precise haptic feedback—allowing for screen-free, eyes-closed regulation. • Adaptive Intensity Checkpoints: If a respiratory ratio exceeds your current CO2 tolerance, the algorithm safely down-scales the timing mid-session. • Dose-Dependent Sessions: Choose 1, 3, or 5-minute intervals based on your immediate physiological requirement. Stop trying to think your way out of a biological response. Use your physiology to change your psychology. Download REZET to gain mechanical control of your nervous system. Disclaimer: REZET provides physiological wellness support and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. ## Version history (last 5 releases) ### 1.0.4 — 2026-06-09 Voice cues guide you through each breath phase. Improved session visuals with phase-colored breathing circle, cycle progress, and session timeline. Toggle voice on/off anytime during a session. ### 1.0.3 — 2026-03-26 - Create and save your own custom breathing protocols - Set inhale, exhale, and optional hold timings - Choose session targets by time or by rounds - Start saved custom protocols from Home in one tap - Stability fixes and session flow polish ### 1.0.2 — 2026-03-20 New: Measure vitals with a 1-minute fingertip camera reading for HRV, pulse, and breathing estimates. Measurement starts automatically after pulse lock. ### 1.0.1 — 2026-03-16 Added CO2 Tolerance Baseline, a guided breathing assessment that measures your post-exhale tolerance across 3 rounds and returns an averaged result. It helps you track breathing consistency over time and better understand how reactive your breathing pattern may be under stress. ### 1.0 — 2026-03-11 No release notes. ## More apps by MARTIN TESAR - [Pruvd: OCD Checking Proof](https://appshunter.io/ios/app/pruvd-ocd-checking-proof/id6757632735) All apps by MARTIN TESAR: https://appshunter.io/developer/1867994856 ## Related topics [nervous system reset free](https://appshunter.io/ios/topics/nervous-system-reset-free) --- *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 2026-06-27.*