# Twilight vs OpenSleep

The clearest difference is in-app purchases: Twilight at none against OpenSleep's 1. Twilight also leads on iOS requirement (17.6 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. OpenSleep sells 1 one-off in-app purchase. Twilight asks for nothing beyond the download.

Twilight ships an update every 3 weeks, OpenSleep every 2 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Twilight | OpenSleep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/opensleep-sleep-tracker-and-ai/id6775201826/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 23 MB | 58 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Rami Maalouf](https://appshunter.io/developer/1783932552) | [Yuan Qian](https://appshunter.io/developer/1894474763) |

## What reviewers say

### Twilight

[App page](https://appshunter.io/ios/app/twilight-simple-sleep-tracker/id6757098758)

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

**In-app purchases:** none


### OpenSleep

[App page](https://appshunter.io/ios/app/opensleep-sleep-tracker-and-ai/id6775201826)

This app offers a privacy-focused, offline sleep tracker and AI coach. It analyzes your sleep patterns locally on your device, synchronizes with Apple Health, and provides detailed insights without sending any data to servers.

**Highlights:** Offline sleep tracking, Local AI sleep coach, Apple Health synchronization, Sleep cycle and stage analysis, Privacy-first, serverless design, Detailed sleep history

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OpenSleep Lifetime Premium | $2.99 | one-time |


## Frequently asked questions

### Is Twilight free?

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

### Is OpenSleep free?

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

### Do Twilight or OpenSleep have ads?

Neither Twilight nor OpenSleep shows ads.

### Which is updated more often, Twilight or OpenSleep?

Twilight ships an update every 3 weeks, and OpenSleep every 2 weeks. Most recently, Twilight was updated on October 30, 2026 and OpenSleep 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.*