# Coherence App — HRV Biofeedback & Breathwork > HRV biofeedback and guided breathing for physiological evaluation and recovery insights. (iPhone/iPad app by TICTACTEL.) - Source: https://appshunter.io/ios/app/coherence-app/id6759622658 (this page in markdown: same URL + `.md`) - Developer: [TICTACTEL](https://appshunter.io/developer/1616300449) - Category: Health & Fitness, Lifestyle - Price: $3.99 - Age rating: 4+ - Requires: iOS 18.6 · 15 MB - Languages: American English, European Spanish - Released: 2026-02-27 - Data updated: 2026-08-24 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/coherence-app/id6759622658/reviews.md ## What is Coherence App? Stop guessing recovery. Just breathe and observe your body improve through ITFD-guided breathing, HRV analysis, and clearer autonomic insight. Coherence is a structured physiological evaluation app built around Heart Rate Variability (HRV) and guided breathing sessions. It does not measure relaxation. It evaluates autonomic behavior, cardiac coherence and recovery patterns through structured session analysis. HOW SESSIONS WORK Sessions are started from Apple Watch. Breathing is guided using haptic feedback and color cues: • Haptic + blue = nasal inhalation • No haptic + green = nasal exhalation Inhalation timing is detected algorithmically in real time. The ITFD algorithm continuously evaluates HRV dynamics and determines the optimal breathing rate and inhalation–exhalation structure during the session. Signal acquisition is performed through Apple Watch. When available, external chest straps such as Movesense or Polar H10 can be used to refine HRV signal quality and improve algorithmic precision. If the HUM button is blinking before starting, the ITFD algorithm has detected that adding humming during exhalation is recommended. Humming is performed as Single-Breath Humming: a steady low sound during the entire exhale, producing stable nasal vibration. This vibratory nasal exhalation is associated with nitric oxide (NO) release. For more detailed information, see the corresponding sections in the Features area of our site. To avoid consciously forced diaphragmatic breathing, the app proposes a light index–thumb opposition as a sensorimotor anchor. This subtle gesture supports postural stability and reduces accessory respiratory engagement without deliberate control. For more detailed information, see the corresponding sections in the Features area of our site. MEASUREMENT AND INTERPRETATION Each session generates an ITFD score derived from HRV behavior across repeated sessions. The model integrates SDNN and RMSSD dynamics to provide structured physiological interpretation. The main card displays, by default, the latest recorded session. If a specific day is selected in the calendar, the card reflects the results of that selected session instead. The dynamic background and main card interface include real-time graphical responses to physiological data during the session. Visual intensity and motion adapt continuously to coherence and stress dynamics, functioning as structured biofeedback rather than decorative animation. The main card includes: • A 7-day mini-chart showing daily minimum and maximum ITFD values • Directional change compared to the previous session • An interpretive phrase integrating structural analysis and circadian context • A selectable calendar • A 30-day trend summarizing overall progression The interpretive phrase reflects the session within the system’s daily pattern, not only an isolated change. In addition to the main interpretation, each session includes detailed charts displaying stress, coherence, and heart rate (HR) data. These charts provide structured visual feedback and allow observation of session dynamics both in real time and retrospectively. STRUCTURE The app is ideally designed for one session in the morning and one in the evening to evaluate daily autonomic patterning. Early sessions progressively stabilize as more data is recorded. Coherence does not provide generic stress scores, motivational framing, or lifestyle coaching. It is designed for users interested in structured HRV interpretation, cardiac coherence analysis, and measurable autonomic dynamics. ## Key features - ITFD-guided breathing sessions - Heart Rate Variability (HRV) analysis - Autonomic behavior evaluation - Haptic and color cue guidance - Real-time graphical biofeedback - ITFD score and session interpretation - Integration with Apple Watch ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/coherence-app/id6759622658/reviews.md ### 1/5 — Non working app *2026-03-21* Asked to fix a week ago. No update. **Developer response:** Hello, We’re sorry to hear about your experience. To help us understand and resolve the issue, we kindly ask that you contact our support team before leaving a review based on limited information. Without further details, it is difficult to assess the problem accurately. Please send us the relevant details, and we’ll be happy to assist you as quickly as possible. Best regards, Coherence Support ### 5/5 — Doesn’t work yet, please fix *2026-03-16* There’s no way I’m giving you a one star review because your app doesn’t work but I just paid four dollars for it and I want it to work so in a week I will update my review ## Frequently asked questions about Coherence App ### What is Coherence App used for? Coherence App is used for structured physiological evaluation, focusing on Heart Rate Variability (HRV) and guided breathing sessions to understand recovery and autonomic behavior. It does not measure relaxation but evaluates autonomic patterns. ### How does Coherence App guide breathing? Breathing is guided using haptic feedback and color cues from an Apple Watch. Haptic feedback with blue indicates nasal inhalation, while no haptic feedback with green indicates nasal exhalation, with real-time algorithmic detection of inhalation timing. ### What devices are supported by Coherence App? Coherence App is supported on iPhone and Apple Watch. External chest straps like Movesense or Polar H10 can also be used to refine HRV signal quality. ### How is session data interpreted in Coherence App? Each session generates an ITFD score derived from HRV behavior, integrating SDNN and RMSSD dynamics. The app provides interpretive phrases and charts displaying stress, coherence, and trends within a circadian context. ### Does Coherence App have ads? No, Coherence App does not contain advertisements. It is a paid application with a one-time purchase price. ### What is the price of Coherence App? Coherence App is available for a one-time purchase of $3.99. There are no in-app purchases or subscription fees associated with its use. ### How often is Coherence App updated? The latest version of Coherence App is 1.4, which was last updated on March 27, 2026. The initial release date was February 27, 2026. ### What is the age rating for Coherence App? Coherence App has an age rating of 4+. This indicates it is suitable for users aged 4 and above, with no specific content restrictions for younger audiences. ## Version history (last 5 releases) ### 1.5 — 2026-04-16 This build fixes an issue detected in the initial permission-grant flow, preventing certain calculations from running before the authorization state was fully resolved. It also strengthens permission handling to make app startup more robust and consistent. ### 1.4 — 2026-03-27 Resolved a refresh issue that could affect the main summary card under specific conditions after completing a session. ### 1.3 — 2026-03-10 Updated screenshots, refined product messaging, and expanded breathwork-focused positioning. ### 1.2 — 2026-03-09 Updated App Store visuals and refined product description. ### 1.1 — 2026-03-03 Minor App Store listing updates and refreshed visuals. ## Related topics [coherence app](https://appshunter.io/ios/topics/coherence-app) · [hrv coherence](https://appshunter.io/ios/topics/hrv-coherence) --- *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 2026-08-24.*