# Protractor vs Trueline

The clearest difference is ads: Protractor at none against Trueline's shown. Trueline's advantage is update cadence (daily vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Protractor sells 3 in-app purchases, starting at $4.99 per 7 days and Trueline sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Protractor ships an update every 6 weeks, Trueline daily. The most recent releases landed on September 24, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Protractor | Trueline |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Daily** |
| Size | 5 MB | 12 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Phuc Pham](https://appshunter.io/developer/1893081423) | [Edge Analytics s.r.o.](https://appshunter.io/developer/1867465595) |

## What reviewers say

### Protractor

[App page](https://appshunter.io/ios/app/protractor-angle-finder/id6772273661)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Incline Gauge Weekly | $4.99 | per 7 days |
| Roof Pitch Yearly | $24.99 | per year |
| Bevel & Degree, Pay Once | $49.99 | one-time |


### Trueline

[App page](https://appshunter.io/ios/app/trueline-level-tool/id6800032249)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trueline Pro | $6.99 | one-time |


## Frequently asked questions

### Is Protractor free?

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

### Is Trueline free?

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

### Do Protractor or Trueline have ads?

Trueline shows ads; Protractor does not.

### Which is updated more often, Protractor or Trueline?

Protractor ships an update every 6 weeks, and Trueline daily. Most recently, Protractor was updated on September 24, 2026 and Trueline on September 15, 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.*