# Protractor vs Slope Level RX

The clearest difference is price: Protractor at Free against Slope Level RX's $1.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Protractor is free to download; Slope Level RX costs $1.99 up front. Protractor sells 3 in-app purchases, starting at $4.99 per 7 days and Slope Level RX 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, Slope Level RX every 3 weeks. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Protractor | Slope Level RX |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 5 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Phuc Pham](https://appshunter.io/developer/1893081423) | [浩东 许](https://appshunter.io/developer/1834069800) |

## 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 |


### Slope Level RX

[App page](https://appshunter.io/ios/app/slope-level-rx/id6772923336)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Membership | $2.99 | one-time |


## Frequently asked questions

### Is Protractor free?

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

### Is Slope Level RX free?

Slope Level RX costs $1.99, and also offers in-app purchases.

### Do Protractor or Slope Level RX have ads?

Neither Protractor nor Slope Level RX shows ads.

### Which is updated more often, Protractor or Slope Level RX?

Protractor ships an update every 6 weeks, and Slope Level RX every 3 weeks. Most recently, Protractor was updated on September 24, 2026 and Slope Level RX on September 9, 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.*