# Heartool vs side.kit

The clearest difference is update cadence: side.kit at fortnightly against Heartool's every 4 months. Heartool's advantage is iOS requirement (12.0 vs 15.1). On price, ads, 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.

Heartool ships an update every 4 months, side.kit fortnightly. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Heartool | side.kit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (14 ratings)](https://appshunter.io/ios/app/heartool/id1567361608/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 21.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 24 MB | 20 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Shenzhen Onecoder Technology Co., Ltd.](https://appshunter.io/developer/1131107345) | [Miguel Lopes](https://appshunter.io/developer/1803232403) |

## What reviewers say

### Heartool

[App page](https://appshunter.io/ios/app/heartool/id1567361608)

Transform your phone into a fitness tracker to monitor workouts with live heart rate data. Analyze training progress with professional charts and gain insights into your health and cardio condition. Integrates with wearable devices and Apple Health.

**Highlights:** Live heart rate tracking, HRV biofeedback, Cardio health analysis, Workout progress charts, Calorie burned tracking, Health data synchronization

**In-app purchases:** none


### side.kit

[App page](https://appshunter.io/ios/app/sidekit/id6743501743)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Heartool free?

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

### Is side.kit free?

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

### Do Heartool or side.kit have ads?

Neither Heartool nor side.kit shows ads.

### Which is updated more often, Heartool or side.kit?

Heartool ships an update every 4 months, and side.kit fortnightly. Most recently, Heartool was updated on September 18, 2026 and side.kit on September 12, 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.*