# 失眠E療 vs Void

The clearest difference is in-app purchases: 失眠E療 at none against Void's 1. 失眠E療 also leads on iOS requirement (11.0 vs 15.0). Void's advantage is update cadence (every 2 days vs every 15 months). On price, ads and device support there is nothing between them.

Both are free to download. Void sells 1 one-off in-app purchase. 失眠E療 asks for nothing beyond the download.

失眠E療 ships an update every 15 months, Void every 2 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | 失眠E療 | Void |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 35 MB | 5 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [The University of Hong Kong](https://appshunter.io/developer/451384643) | [烜兆 林](https://appshunter.io/developer/1808312464) |

## What reviewers say

### 失眠E療

[App page](https://appshunter.io/ios/app/e/id1463472912)

This app offers an online platform based on cognitive behavioral therapy for insomnia (CBT-I). It provides six courses covering sleep knowledge, behavioral strategies, sleep hygiene, and cognitive therapy, along with tools like sleep diaries to help users manage and improve their sleep.

**Highlights:** Cognitive Behavioral Therapy for Insomnia (CBT-I), Six structured courses on sleep management, Sleep diary tool, Relaxation training exercises, Knowledge and techniques for insomnia, Relapse prevention strategies

**In-app purchases:** none


### Void

[App page](https://appshunter.io/ios/app/void-relax-and-sleep/id6744612138)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Forever Unlock | $0.99 | one-time |


## Frequently asked questions

### Is 失眠E療 free?

失眠E療 is free to download, with no in-app purchases.

### Is Void free?

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

### Do 失眠E療 or Void have ads?

Neither 失眠E療 nor Void shows ads.

### Which is updated more often, 失眠E療 or Void?

失眠E療 ships an update every 15 months, and Void every 2 days. Most recently, 失眠E療 was updated on October 1, 2026 and Void on September 30, 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.*