# FourierSleep vs GoodSleep

The clearest difference is update cadence: FourierSleep at daily against GoodSleep's every 4 days. FourierSleep also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FourierSleep sells 1 one-off in-app purchase and GoodSleep sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

FourierSleep ships an update daily, GoodSleep every 4 days. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | FourierSleep | GoodSleep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/goodsleep-brainwave-sleep/id6761592716/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 94.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 4 days |
| Monetization | — | Freemium |
| Size | 18 MB | 138 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [TANG CHENGJUN](https://appshunter.io/developer/1887430333) | [EMMO Corp.](https://appshunter.io/developer/1507868195) |

## What reviewers say

### FourierSleep

[App page](https://appshunter.io/ios/app/fouriersleep/id6761359040)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock PRO | $4.99 | one-time |


### GoodSleep

[App page](https://appshunter.io/ios/app/goodsleep-brainwave-sleep/id6761592716)

This app uses brainwave-based audio to help you fall asleep faster, achieve deeper sleep, and wake up feeling refreshed. It offers sleep analysis, personalized insights, and gentle alarms to improve your sleep rhythm and overall sleep quality.

**Highlights:** Brainwave sleep aid with binaural beats, Sound mixing for relaxation, Pre-sleep mood and activity logging, Sleep constellation visualization, Sleep debt tracking and recovery suggestions, AI sleep assistant, Apple Health integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Membership | $2.99 | per 7 days |
| Quarterly Membership | $7.99 | per 3 months |
| Yearly Membership | $29.99 | per year |


## Frequently asked questions

### Is FourierSleep free?

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

### Is GoodSleep free?

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

### Do FourierSleep or GoodSleep have ads?

Neither FourierSleep nor GoodSleep shows ads.

### Which is updated more often, FourierSleep or GoodSleep?

FourierSleep ships an update daily, and GoodSleep every 4 days. Most recently, FourierSleep was updated on October 25, 2026 and GoodSleep on November 5, 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.*