# Cardio Chart vs Stromno

The clearest difference is price: Cardio Chart at Free against Stromno's $4.99. Cardio Chart also leads on rating (5.0 vs 3.1). Stromno's advantage is update cadence (every 3 months vs every 25 months) and ratings volume (24 vs 1). On ads, in-app purchases and monetization model there is nothing between them.

Cardio Chart is free to download; Stromno costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Cardio Chart holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Stromno has 24 ratings behind it against 1, so its average is the more settled of the two.

Cardio Chart ships an update every 25 months, Stromno every 3 months. The most recent releases landed on July 4, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Cardio Chart | Stromno |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cardio-chart/id1180616397/reviews)** | [3.1 (24 ratings)](https://appshunter.io/ios/app/stromno/id1538966480/reviews) |
| Number of ratings | 1 | **24** |
| Positive reviews | — | 57.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 0 MB | 1 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Clever Armadillo LLC](https://appshunter.io/developer/570999114) | [Yaroslav Hryniuk](https://appshunter.io/developer/1538966482) |

## What reviewers say

### Cardio Chart

[App page](https://appshunter.io/ios/app/cardio-chart/id1180616397)

Visualize your heart rate during workouts with detailed graphs. Track maximum and average heart rates to understand exercise impact. Requires heart rate data recorded to the Health app.

**Highlights:** Heart rate workout graphs, Maximum heart rate display, Average heart rate display, Health app integration, Workout data visualization

**In-app purchases:** none


### Stromno

[App page](https://appshunter.io/ios/app/stromno/id1538966480)

Broadcast your real-time heart rate from your Apple Watch to live streams on platforms like Twitch and YouTube. Easily set up a customizable widget or overlay for your stream with a simple login code.

**Highlights:** Heart rate streaming from Apple Watch, Live stream integration (Twitch, YouTube), Customizable widget/overlay designs, Easy 1-minute setup, OBS, Twitch Studio, XSplit, Streamlabs OBS compatible, Integrates with Apple Health

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Cardio Chart free?

Cardio Chart is free to download, with no in-app purchases.

### Is Stromno free?

Stromno costs $4.99, with no in-app purchases.

### Which has better reviews, Cardio Chart or Stromno?

Cardio Chart is rated higher. Cardio Chart averages 5.0 out of 5 from 1 ratings, while Stromno averages 3.1 from 24 ratings.

### Do Cardio Chart or Stromno have ads?

Neither Cardio Chart nor Stromno shows ads.

### Which is updated more often, Cardio Chart or Stromno?

Cardio Chart ships an update every 25 months, and Stromno every 3 months. Most recently, Cardio Chart was updated on July 4, 2026 and Stromno on September 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*