# Sleep Effect vs StillSound

The clearest difference is in-app purchases: Sleep Effect at none against StillSound's 3. StillSound's advantage is iOS requirement (18.0 vs 26.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. StillSound sells 3 in-app purchases, starting at $1.99 per month. Sleep Effect asks for nothing beyond the download.

Sleep Effect ships an update fortnightly, StillSound monthly. The most recent releases landed on October 11, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Sleep Effect | StillSound |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 324 MB | 30 MB |
| Requires iOS | 26.1 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ahmed Nabulsi](https://appshunter.io/developer/1863897890) | [培 李](https://appshunter.io/developer/967575939) |

## What reviewers say

### Sleep Effect

[App page](https://appshunter.io/ios/app/sleep-effect/id6762162467)

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

**In-app purchases:** none


### StillSound

[App page](https://appshunter.io/ios/app/stillsound-noise-machine/id6777607721)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $9.99 | per year |
| Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Sleep Effect free?

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

### Is StillSound free?

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

### Do Sleep Effect or StillSound have ads?

Neither Sleep Effect nor StillSound shows ads.

### Which is updated more often, Sleep Effect or StillSound?

Sleep Effect ships an update fortnightly, and StillSound monthly. Most recently, Sleep Effect was updated on October 11, 2026 and StillSound on October 13, 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.*