# CoTan vs ECGStudio

The clearest difference is ads: ECGStudio at none against CoTan's shown. CoTan's advantage is update cadence (every 3 days vs every 3 months) and iOS requirement (15.1 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CoTan ships an update every 3 days, ECGStudio every 3 months. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | CoTan | ECGStudio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 3 months |
| Size | 28 MB | 9 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Ryo Minebayashi](https://appshunter.io/developer/1854415357) | [Keisuke Nakashima](https://appshunter.io/developer/1691259083) |

## What reviewers say

### CoTan

[App page](https://appshunter.io/ios/app/cotan/id6755531559)

**Features:** macOS Compatibility

**In-app purchases:** none


### ECGStudio

[App page](https://appshunter.io/ios/app/ecgstudio-ecg-draw-and-lecture/id6761598719)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CoTan free?

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

### Is ECGStudio free?

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

### Do CoTan or ECGStudio have ads?

CoTan shows ads; ECGStudio does not.

### Which is updated more often, CoTan or ECGStudio?

CoTan ships an update every 3 days, and ECGStudio every 3 months. Most recently, CoTan was updated on October 28, 2026 and ECGStudio on October 31, 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.*