# Sleep Calculator vs EmberKeep

The clearest difference is in-app purchases: EmberKeep at none against Sleep Calculator's 1. Sleep Calculator's advantage is update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sleep Calculator sells 1 one-off in-app purchase. EmberKeep asks for nothing beyond the download.

Sleep Calculator ships an update weekly, EmberKeep every 2 months. The most recent releases landed on October 13, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Sleep Calculator | EmberKeep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Size | 13 MB | 55 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tharindu Prabath](https://appshunter.io/developer/1675338074) | [Jerry Crews](https://appshunter.io/developer/1570896037) |

## What reviewers say

### Sleep Calculator

[App page](https://appshunter.io/ios/app/sleep-calculator-wake-up/id6744512529)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sleep Calculator Premium | $2.99 | one-time |


### EmberKeep

[App page](https://appshunter.io/ios/app/emberkeep-habit-keep/id6790248632)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sleep Calculator free?

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

### Is EmberKeep free?

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

### Do Sleep Calculator or EmberKeep have ads?

Neither Sleep Calculator nor EmberKeep shows ads.

### Which is updated more often, Sleep Calculator or EmberKeep?

Sleep Calculator ships an update weekly, and EmberKeep every 2 months. Most recently, Sleep Calculator was updated on October 13, 2026 and EmberKeep on October 10, 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.*