# EndureIndex vs Sleep Tracker

The clearest difference is in-app purchases: Sleep Tracker at none against EndureIndex's 2. Sleep Tracker also leads on update cadence (every 6 days vs every 3 weeks) and iOS requirement (18.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. EndureIndex sells 2 in-app purchases, starting at $1.99 per month. Sleep Tracker asks for nothing beyond the download.

EndureIndex ships an update every 3 weeks, Sleep Tracker every 6 days. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | EndureIndex | Sleep Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 8 MB | 24 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Danilo Krautz](https://appshunter.io/developer/1875731224) | [Sven Kraln](https://appshunter.io/developer/6816678493) |

## What reviewers say

### EndureIndex

[App page](https://appshunter.io/ios/app/endureindex-training/id6760260948)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EndureIndex Pro Monthly | $1.99 | per month |
| EndureIndex Pro Yearly | $14.99 | per year |


### Sleep Tracker

[App page](https://appshunter.io/ios/app/sleep-tracker-cernidia/id6816678341)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is EndureIndex free?

EndureIndex is free to download, with in-app purchases available.

### Is Sleep Tracker free?

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

### Do EndureIndex or Sleep Tracker have ads?

Neither EndureIndex nor Sleep Tracker shows ads.

### Which is updated more often, EndureIndex or Sleep Tracker?

EndureIndex ships an update every 3 weeks, and Sleep Tracker every 6 days. Most recently, EndureIndex was updated on October 24, 2026 and Sleep Tracker on October 29, 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.*