# Cardio Display — Displays heart rate from Watch > Displays Apple Watch heart rate data on a paired iPhone. (iPhone/iPad app by Mikhail Sereniti.) - Source: https://appshunter.io/ios/app/cardio-display/id1576127724 (this page in markdown: same URL + `.md`) - Developer: [Mikhail Sereniti](https://appshunter.io/developer/1576127726) - Category: Health & Fitness, Medical - Price: Free - Rating: 3.00/5 from 2 App Store ratings · 2 written reviews indexed - Age rating: 17+ - Requires: iOS 14.5 · 2 MB - Languages: American English - Released: 2021-07-18 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/cardio-display/id1576127724/reviews.md ## What is Cardio Display? The app allows you to see your heart rate, measured on Apple Watch, right on the paired iPhone. To get started, open iPhone app, then open Watch app or vice-versa. Both apps will immediately connect and stream heart rate data from your wrist to an iPhone's screen. Notice: this app cannot be used without Apple Watch. Be carefully to allow the watch app to have Heart Rate permission. If you denied it or closed app while prompted, go to iPhone privacy settings and allow app to have access to Heart Rate. Use this app to control your workout or cardio fitness speed without an effort. You can also use the app to allow your buddy or coach to get known if your training is going to hard or dangerous. Watch app works in background, so it can be used along other Watch apps, but background session is limited for an hour, so if you have a very long workout, once an hour you have to reopen the Watch app. ## Key features - Real-time heart rate display - iPhone and Apple Watch integration - Workout monitoring - Share training intensity - Background watch app functionality ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/cardio-display/id1576127724/reviews.md ### 5/5 — Simple and Effective *2023-05-09* This is the only app I can find that will display my HR in real-time. I have an Apple Watch SE, so mirroring is not supported. I like using this app the maintain HR zones during cardio. ### 1/5 — Disconnects after 25 seconds *2021-12-19, version 1.2* I was happy to find this app and it seemed to work well when I tried it out. It displays my heart rate in large numbers on my iPhone so I can keep track of my heart rate while rowing. Perfect, or so I thought, but then it started to disconnect after about half a minute and displays the “Open companion app” message. I got the connection going again but the same thing happened. I’m using an iPhone 13 and a series 5 watch. Please improve the connectivity because it’s a really helpful app. **Developer response:** Hello and thank you for your feedback. I will check out and fix that connection issue (planed in a week, but it may take up to a month) ## Frequently asked questions about Cardio Display ### Does Cardio Display have ads? The provided data does not specify if Cardio Display contains advertisements. It is listed as a free application. ### What devices does Cardio Display support? Cardio Display is compatible with Apple Watch, iPhone, and iPod devices. It requires an Apple Watch to function. ### How accurate is Cardio Display's heart rate data? The app displays heart rate measured by the Apple Watch. Data accuracy is dependent on the Apple Watch's sensor performance and proper permissions. ### Can Cardio Display be used with other Watch apps? Yes, the Watch app works in the background and can be used alongside other Watch applications. However, background sessions are limited to one hour. ### What is the age rating for Cardio Display? Cardio Display has an age rating of 17+. This is based on the app's metadata provided. ### How often is Cardio Display updated? The latest version of Cardio Display was released on January 23, 2022. The app was initially released on July 18, 2021. ### What is the user sentiment for Cardio Display? Based on the provided rating, Cardio Display has an average of 3.0 stars from 2 ratings. This suggests a mixed to neutral user reception. ### Do I need to grant special permissions for Cardio Display? Yes, it is important to allow the Watch app to have Heart Rate permission. If denied, you may need to adjust this in your iPhone's privacy settings. ## Version history (last 4 releases) ### 1.3 — 2022-01-23 Rebuild connection protocol to fix app disconnecting issue. ### 1.2 — 2021-10-18 Supported iPhone landscape orientation ### 1.1 — 2021-07-18 Fixed critical bug ### 1.0 — 2021-07-18 No release notes. ## Apps similar to Cardio Display | App | Rating | Price | Category | | --- | --- | --- | --- | | [HeartRand](https://appshunter.io/ios/app/heartrand/id1549664832) | 2.0 (1) | Free | Health & Fitness | | [Studio Hub Watch App](https://appshunter.io/ios/app/studio-hub-watch-app/id1644000248) | — | Free | Health & Fitness | | [Yudemon HRV](https://appshunter.io/ios/app/yudemon-hrv/id1629852639) | 4.8 (8) | Free | Health & Fitness | | [Kid Care - from SLCH](https://appshunter.io/ios/app/kid-care-from-slch/id377701960) | 4.8 (25) | Free | Health & Fitness | | [Withings](https://appshunter.io/ios/app/withings/id542701020) | 4.6 (353,825) | Free | Health & Fitness | | [Sanctuary Workout Companion®](https://appshunter.io/ios/app/sanctuary-workout-companion/id1504134614) | 4.5 (4) | Free | Health & Fitness | ## More apps by Mikhail Sereniti - [Cardio Bounds](https://appshunter.io/ios/app/cardio-bounds/id1578028994) All apps by Mikhail Sereniti: https://appshunter.io/developer/1576127726 --- *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 2026-06-10.*