# 无眠 vs 三思照度计

The clearest difference is in-app purchases: 三思照度计 at none against 无眠's 1. 三思照度计 also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 10 months). On price and device support there is nothing between them.

Both are free to download. 无眠 sells 1 one-off in-app purchase. 三思照度计 asks for nothing beyond the download.

无眠 ships an update every 10 months, 三思照度计 every 2 weeks. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 无眠 | 三思照度计 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 2 weeks** |
| Size | 41 MB | 1 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [坤 张](https://appshunter.io/developer/1415616112) | [Shanghai Sansi Electronic Engineering Co., Ltd](https://appshunter.io/developer/965055646) |

## What reviewers say

### 无眠

[App page](https://appshunter.io/ios/app/id1488413414)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all sounds | $1.99 | one-time |


### 三思照度计

[App page](https://appshunter.io/ios/app/id6446383682)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 无眠 free?

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

### Is 三思照度计 free?

三思照度计 is free to download, with no in-app purchases.

### Do 无眠 or 三思照度计 have ads?

无眠 shows ads; 三思照度计 does not.

### Which is updated more often, 无眠 or 三思照度计?

无眠 ships an update every 10 months, and 三思照度计 every 2 weeks. Most recently, 无眠 was updated on October 25, 2026 and 三思照度计 on October 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.*