# Protractor, Level vs 量尺 Ruler

The clearest difference is in-app purchases: 量尺 Ruler at none against Protractor, Level's 1. 量尺 Ruler also leads on update cadence (every 6 days vs fortnightly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Protractor, Level sells 1 one-off in-app purchase. 量尺 Ruler asks for nothing beyond the download.

Protractor, Level ships an update fortnightly, 量尺 Ruler every 6 days. The most recent releases landed on November 12, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Protractor, Level | 量尺 Ruler |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Size | 2 MB | 5 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Streamlined Studios](https://appshunter.io/developer/1802378603) | [禹焓 颜](https://appshunter.io/developer/6802085634) |

## What reviewers say

### Protractor, Level

[App page](https://appshunter.io/ios/app/protractor-level-notch/id6795315730)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Notch Pro | $2.99 | one-time |


### 量尺 Ruler

[App page](https://appshunter.io/ios/app/ruler/id6802361249)

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

**In-app purchases:** none


## Frequently asked questions

### Is Protractor, Level free?

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

### Is 量尺 Ruler free?

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

### Do Protractor, Level or 量尺 Ruler have ads?

Neither Protractor, Level nor 量尺 Ruler shows ads.

### Which is updated more often, Protractor, Level or 量尺 Ruler?

Protractor, Level ships an update fortnightly, and 量尺 Ruler every 6 days. Most recently, Protractor, Level was updated on November 12, 2026 and 量尺 Ruler on November 6, 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.*