# Cardiio: Heart Rate Monitor — user reviews > 2,018 indexed App Store user reviews of Cardiio by Cardiio, Inc., rated 4.70/5 from 58,416 ratings. - Source: https://appshunter.io/ios/app/cardiio-heart-rate-monitor/id542891434/reviews - App overview in markdown: https://appshunter.io/ios/app/cardiio-heart-rate-monitor/id542891434.md - Rating breakdown: 5★ 46,444 · 4★ 8,894 · 3★ 2,204 · 2★ 365 · 1★ 509 ## What do users think of Cardiio? Overall sentiment: positive **Pros** - 👍 Accurate heart rate monitoring - 👍 Convenient and easy to use - 👍 Helpful for monitoring heart health conditions - 👍 Useful workout features - 👍 Integrates well with Apple Health **Cons** - 🐛 Inconsistent or unreliable readings - 🐛 Difficulty getting readings after exercise - 🐛 Compatibility issues with newer iPhone models - 💰 Paid features not worth the cost - 🔒 Privacy concerns with data sharing **Commonly reported bugs** - App crashes or freezes - Inaccurate or missing heart rate data - Inability to save or export readings **Most requested features** - Customizable workout options - Support for irregular heart rhythms - Better historical data tracking - Gender-neutral setup options ## Newest reviews (12 of 2,018) ### 4/5 — Mostly accurate *2026-07-18, version 4.1.7* I use this app to track my waking heart rate and the times when I exercise. Most of the time, it’s easy to use and to get an accurate reading. Sometimes, it can read that my finger is blocking the camera lens, but it won’t give me an accurate reading. Other times it has difficulty locking onto my finger at all. So, mixed review. ### 3/5 — Endurance score bug *2026-04-08, version 4.1.5* The endurance score is no longer working as it did. Seems to be fixed. ### 3/5 — I like the app but I don’t like it *2026-03-15, version 4.1.5* You literally got to sit still no movement period or it will not register. You guys need to fix that issue. ### 1/5 — Doesn’t work well *2026-02-28, version 4.1.4* Most of the time it can’t get a reading. Not worth it. ### 3/5 — 起立性調節障害です *2026-02-19* 急に出先で体調が悪くなった時に便利です。でも体調が悪い時は(心拍数がぶれるから？)エラーしか出ません笑だから途中経過を自分でやっています。でも記録されないので(エラーが出たやつは)困っています。そこをなんとかできたらなぁ... ### 1/5 — Todo el rato da error *2026-02-19, version 4.1.4* Da error todo el rato al medir la frecuencia, indicando que haga menos presión. Es un engorro utilizarlo. Además, no tiene apenas funcionalidades gratuitas, todo menos el pulso (que no mide nunca porque siempre da error) es de pago. Muy mal. ### 1/5 — Buyer Beware *2026-02-16, version 4.1.4* I thought by the “ heart rate checker and beat analyzer” description that this would actually give me a wave form like an ECG. All it does is give you the whip more like a pulse ox. I’m capable of counting my own pulse so this was a disappointment for me. I’m hoping to get a refund as it’s just been about an hour since I bought it and realized that it wasn’t what I thought it was. ### 2/5 — Great when it works. *2026-02-08, version 4.1.4* More often than not I don’t get a reading because of “poor signal quality” no matter what I try to ### 1/5 — Poor system *2026-02-07, version 4.1.4* Doesn’t give a correct reading no matter how many times you try!! ### 1/5 — Ücretsiz deneme tuzağı *2026-01-28, version 4.1.4* Ücretsiz deneme tuzağına düşmeyin. Anında vazgeçseniz de ücret iadesi yapmıyorlar. ### 1/5 — Be care full, they cheat and no support *2026-01-20, version 4.1.4* I tried your app using the 3-day trial, which I activated on Friday at 4 PM. However, it never worked — I kept getting errors every time I tried to use it, so I eventually gave up. I planned to cancel the subscription on Monday morning, but at 8 AM you had already charged me, in less than the agreed 3-day period. This is unacceptable: the app didn’t work, I attempted to use it twice, both times with errors, and no one has replied to my support messages. I asked why the payment wasn’t refunded even though I cancelled immediately after the charge went through. ### 1/5 — Not worth it *2026-01-19, version 4.1.4* Much better apps available. ## Most critical reviews (10 lowest-rated) ### 1/5 — All it wants is money *2026-08-01, version 4.1.7* Waste of time. Need to pay to use. ### 1/5 — Slow and Hard to Work With *2026-07-14, version 4.1.7* I do think the app is organized, however it’s SO difficult to work with and it takes like ten tries each time you want to record your heart rate. I tried using this for a class, but by the time it recorded, my heart rate would lower after a workout. It’s just not reliable and I’ve talked to some of my friends who used this app for the same reason and they had the same issues with it. Do not recommend. ### 1/5 — Poor signal quality? *2026-07-07, version 4.1.7* I will watch as the app measures my heart rate and stays in a very narrow range as I hold my finger over the camera for however long. It seems perfect, but then it just says “poor signal quality” with no other explanation. The signal quality was in fact not poor as I watched the data being collected and it seemed to be very consistent throughout the entire process. I need to use this app to properly measure my heart rate, and it is not doing what it claims to be good at. ### 1/5 — Doesn’t work *2026-07-03, version 4.1.7* Every time I used it, it measured the heart rate for quite a long time. Then, at the very end, it said “poor signal” and terminated. This is a terrible product. I deleted it, and I don’t miss it at all. ### 1/5 — Didn’t work *2026-07-01, version 4.1.7* Every time I tried said poor signal and couldn’t do a reading no matter how I adjusted the light and camera. Other similar apps worked much better and actually worked. Disappointed. ### 1/5 — Русский *2026-06-12* При обновлении пропал русский язык. Верните. ### 1/5 — Scam *2026-05-13, version 4.1.5* Claims it’s free, demands money for use after download. ### 1/5 — Ничего не измеряет *2026-04-14* Ничего сверхъестественного не делаю, не двигаюсь, палец проложила, он мерит, показывает цифры а в конце оказывается что сигнала не было и просит заново. А сразу типа не понятно что сигнала нет? И как же тогда измерение шло? Просто убивает время и не дает результата ### 1/5 — Perigo para o bolso *2026-03-28* Pode até ser bom, mas testes gratuitos são uma arapuca. Você concorda, começa a pagar depois de uma semana e se esquece de desativar ### 1/5 — Cobrança *2026-03-10* Foi realizado cobrança no momento que foi iniciado, mesmo constando que os primeiros 3 dias seriam de testes. ## Most praised reviews (10 highest-rated) ### 5/5 — Interesting concept that works *2026-08-30, version 4.1.7* Unbelievable how accurate this is. I do this about once per week and show the results to my dr. Gives me peace of mind. ### 5/5 — Feeling odd *2026-08-09, version 4.1.7* A while ago I was feeling a little odd. I used your heart app and could see that my heart was missing beats and was able to call paramedics who came and dealt with me. Brilliant ### 5/5 — Makes it simple! *2026-06-30, version 4.1.7* I enjoy checking my bpm with this makes it so easy ### 5/5 — Tracker *2026-05-30, version 4.1.5* Great for measuring heart rate:) ### 5/5 — No blood monitors *2026-05-12, version 4.1.5* I’m enjoying the app but the only issue I have is that there is no blood monitor ### 5/5 — David *2026-05-08, version 4.1.5* Bnkien ### 5/5 — Great app *2026-04-23, version 4.1.5* Woke up with racing heart, helped monitor the situation ### 5/5 — Prático *2026-03-03* Eficiente! ### 5/5 — iPhone 17. ???? *2025-12-29* К сожалению не работает на iPhone 17 Pro Max. ???? ### 5/5 — Great App *2025-12-28, version 4.1.3* Love how I can easily check my heart rate anywhere and anytime, especially if I’m not wearing my smartwatch. --- *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 2026-09-05.*