# Mariabs · Interval Timer vs Koala Sleep Tracker

The clearest difference is device support: Mariabs · Interval Timer at 3 against Koala Sleep Tracker's 1. Mariabs · Interval Timer also leads on iOS requirement (16.2 vs 18.0). On price, 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.

## The numbers

| Metric | Mariabs · Interval Timer | Koala Sleep Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 days | — |
| Size | 4 MB | 10 MB |
| Requires iOS | **16.2** | 18.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [PER MAGNE HELSETH](https://appshunter.io/developer/1895962879) | [Vasco de Graaff](https://appshunter.io/developer/1766914878) |

## What reviewers say

### Mariabs · Interval Timer

[App page](https://appshunter.io/ios/app/mariabs-interval-timer/id6765472133)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Koala Sleep Tracker

[App page](https://appshunter.io/ios/app/koala-sleep-tracker/id6782061692)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mariabs · Interval Timer free?

Mariabs · Interval Timer is free to download, with no in-app purchases.

### Is Koala Sleep Tracker free?

Koala Sleep Tracker is free to download, with no in-app purchases.

### Do Mariabs · Interval Timer or Koala Sleep Tracker have ads?

Neither Mariabs · Interval Timer nor Koala Sleep Tracker shows ads.

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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.*