# Impact Hours vs Calnder

The clearest difference is iOS requirement: Calnder at 13.0 against Impact Hours's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Impact Hours | Calnder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Size | 39 MB | 23 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Xiao Zhou](https://appshunter.io/developer/1842061963) | [Awal Salifu](https://appshunter.io/developer/1888083791) |

## What reviewers say

### Impact Hours

[App page](https://appshunter.io/ios/app/impact-hours/id6752991646)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calnder

[App page](https://appshunter.io/ios/app/calnder/id6763020375)

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

**In-app purchases:** none


## Frequently asked questions

### Is Impact Hours free?

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

### Is Calnder free?

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

### Do Impact Hours or Calnder have ads?

Neither Impact Hours nor Calnder shows ads.

### Which is updated more often, Impact Hours or Calnder?

Impact Hours ships an update every 4 days, and Calnder every 4 days. Most recently, Impact Hours was updated on October 28, 2026 and Calnder on October 25, 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.*