# Protractor Edge vs Maintain

The clearest difference is ads: Maintain at none against Protractor Edge's shown. Maintain also leads on update cadence (daily vs every 43 months). Protractor Edge's advantage is iOS requirement (9.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year and Maintain sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Protractor Edge ships an update every 43 months, Maintain daily. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Protractor Edge | Maintain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (94 ratings)](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762/reviews)** | — |
| Number of ratings | **94** | — |
| Positive reviews | 69.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 43 months | **Daily** |
| Monetization | Freemium | — |
| Size | 21 MB | 5 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [嵩 张](https://appshunter.io/developer/1091921941) | [Ezar Ahrend](https://appshunter.io/developer/6795534406) |

## What reviewers say

### Protractor Edge

[App page](https://appshunter.io/ios/app/protractor-edge-clinometer/id1198499762)

Measure angles directly on your device without taking photos or placing the angle on screen. This app offers a unique and efficient way to determine degrees, saving you time with its handy assistant functionality.

**Highlights:** Direct angle measurement on device, Intuitive line dragging interface, Measures angles in photos (Premium), Measures from camera view (Premium), Ad-free experience (Premium)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $1.99 | per year |
| Remove Ads | $0.99 | one-time |


### Maintain

[App page](https://appshunter.io/ios/app/maintain-asset-tracker/id6795534404)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Maintain Pro Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is Protractor Edge free?

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

### Is Maintain free?

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

### Do Protractor Edge or Maintain have ads?

Protractor Edge shows ads; Maintain does not.

### Which is updated more often, Protractor Edge or Maintain?

Protractor Edge ships an update every 43 months, and Maintain daily. Most recently, Protractor Edge was updated on October 24, 2026 and Maintain on October 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.*