# TensionRadar — HRV and stress at a glance > Visualizes Apple Watch HRV data to show stress levels with a character. (iPhone/iPad app by Chen He.) - Source: https://appshunter.io/ios/app/tensionradar/id6753273426 (this page in markdown: same URL + `.md`) - Developer: [Chen He](https://appshunter.io/developer/1843281784) - Category: Health & Fitness - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 18.0 · 14 MB - Languages: American English, European Spanish, Korean, German (Germany), Brazilian Portuguese, Chinese (Traditional, Taiwan), Chinese (Simplified, China), French (France), Japanese - Released: 2026-10-06 - Data updated: 2026-10-12 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/tensionradar/id6753273426/reviews.md ## What is TensionRadar? TensionRadar turns the heart data your Apple Watch already records into a picture of your stress, with a small cartoon character that feels what your heart feels. HOW IT WORKS Heart rate variability (HRV) is the tiny variation between heartbeats. More variation means a relaxed, adaptable nervous system; less means load. TensionRadar learns your personal HRV baseline over a few weeks and scores every new reading against it, blended with how far your heart rate sits above resting. The result is a 0 to 100 stress score in five bands: Serene, Calm, Steady, Tense and Overloaded. UPDATES AS DATA BECOMES AVAILABLE TensionRadar reads new Apple Watch measurements from Health and supports background updates. Apple controls when HRV is measured and when apps and widgets refresh, so readings may be delayed and are not continuous. Open the app to check the latest available data. BEAT-TO-BEAT DETAIL The beat-to-beat recordings Apple Watch makes during Breathe and Mindfulness sessions are decoded on the phone, giving you RMSSD, SDNN and pNN50 alongside the daily SDNN trend. COHERENCE BREATHING Breathe at your resonance frequency with a paced circle. With the TensionRadar watch app, your Apple Watch measures your heart rate during the session and the coherence score updates in real time. Sessions are saved to Apple Health as Mindful Minutes. TRENDS AND INSIGHTS Daily HRV against your typical band, resting heart rate, HRV by hour of day, and a month-by-month mood calendar of character faces. Log coffee, sleep, workouts and how you feel; after a few entries TensionRadar shows which habits move your HRV. MEET NIMBUS Nimbus, a small cloud whose weather follows your heart, is free and breathes, blinks and droops with your data. The optional Character Pack adds Bloop the blob, Mochi the cat and Sprout the plant for $0.99, once, on all your devices. WATCH COMPLICATIONS Five complications for compatible watch faces and slots: your character with its stress ring, your HRV number against your typical range, a 0–100 stress score, heart rate with resting heart rate, and a seven-day HRV chart. The same set works on the iPhone Lock Screen. PICK YOUR ICON Choose the Nimbus radar icon or a character icon, or let the icon follow your character. ALSO • Home Screen widgets and an Apple Watch app that mirrors the radar on your wrist • Rich watch notifications showing your character, stress band and HRV • Tips that explain HRV, SDNN, RMSSD and every other number • Morning summary and rate-limited tension alerts, only from real readings • No account, no server, no analytics. Everything stays on your device. REQUIREMENTS iPhone with iOS 18 or later and an Apple Watch that records heart rate variability. TensionRadar is a wellness tool, not a medical device. It does not diagnose or treat any condition. ## Key features - HRV and stress visualization - Character mood indicator - Coherence breathing guide - Habit tracking and insights - Apple Watch app and complications - Home Screen widgets - Beat-to-beat detail analysis ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Character Pack | $0.99 | one-time | ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/tensionradar/id6753273426/reviews.md ### 5/5 — Wow! *2026-10-07* Works great! I like the information this app gives me from my health data! ### 5/5 — Kudos man *2026-10-07* Great companion, love the cute design ## Frequently asked questions about TensionRadar ### What is TensionRadar? TensionRadar is a wellness tool that uses your Apple Watch's heart rate variability (HRV) data to provide a visual representation of your stress levels. It features a character that changes based on your stress score and offers insights into your habits. ### Does TensionRadar have ads? No, TensionRadar does not contain advertisements. The app is free to download and use, with optional cosmetic character packs available for purchase. ### What devices is TensionRadar compatible with? TensionRadar requires an iPhone with iOS 18 or later and an Apple Watch that records heart rate variability. It also supports watch complications and iPhone Lock Screen widgets. ### How does TensionRadar measure stress? TensionRadar analyzes heart rate variability (HRV), which is the variation between heartbeats. It learns your personal HRV baseline and scores new readings against it, combined with your heart rate relative to resting, to generate a stress score. ### Can I practice breathing exercises with TensionRadar? Yes, TensionRadar includes a Coherence Breathing feature that guides you to breathe at your resonance frequency with a paced circle. The Apple Watch app can measure your heart rate during these sessions and update your coherence score in real time. ### How often is my data updated in TensionRadar? TensionRadar updates as new Apple Watch measurements become available. Apple controls when HRV is measured and when apps refresh, so readings may be delayed and are not continuous. You can open the app to check the latest data. ### What is the cost of TensionRadar? TensionRadar is free to download and use. There is an optional Character Pack available for $0.99, which unlocks additional characters like Bloop the blob, Mochi the cat, and Sprout the plant. ### Does TensionRadar require an account? No, TensionRadar does not require an account. All data is processed and stored locally on your device, ensuring your privacy. There are no servers or analytics used by the app. ## Version history (last 2 releases) ### 1.0.1 — 2026-10-06 Improves Character Pack purchasing with clearer loading, error messages, and retry. Clarifies monitoring status and fixes the radar ring at the maximum score. ### 1.0.0 — 2026-10-06 No release notes. ## More apps by Chen He - [Structly - JSON Formatter](https://appshunter.io/ios/app/structly-json-formatter/id6753774575) - [Keeps: Cost Per Use Tracker](https://appshunter.io/ios/app/keeps-cost-per-use-tracker/id6811795155) - [LiftCoach](https://appshunter.io/ios/app/liftcoach/id6812929269) All apps by Chen He: https://appshunter.io/developer/1843281784 --- *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 2026-10-12.*