# Angle Gradient Inclinometer vs GrayHawkOS

The clearest difference is ads: GrayHawkOS at none against Angle Gradient Inclinometer's shown. GrayHawkOS also leads on update cadence (every 5 days vs every 8 months). Angle Gradient Inclinometer's advantage is iOS requirement (13 vs 15.1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Angle Gradient Inclinometer ships an update every 8 months, GrayHawkOS every 5 days. Both last shipped on November 6, 2026.

## The numbers

| Metric | Angle Gradient Inclinometer | GrayHawkOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (315 ratings)](https://appshunter.io/ios/app/angle-gradient-inclinometer/id530077112/reviews)** | — |
| Number of ratings | **315** | — |
| Positive reviews | 51.1% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 8 months | **Every 5 days** |
| Monetization | Ad-supported | — |
| Size | 11 MB | 23 MB |
| Requires iOS | **13** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SHIGETO TAKAGI](https://appshunter.io/developer/519611619) | [GrayHawkOS LLC](https://appshunter.io/developer/6808045280) |

## What reviewers say

### Angle Gradient Inclinometer

[App page](https://appshunter.io/ios/app/angle-gradient-inclinometer/id530077112)

Easily measure tilt angles with this free protractor app. It displays inclination from 0 to 359 degrees, along with gradient percentages and angles summing to 180 or 360 degrees. Switch to theodolite mode to set a specified angle to zero.

**Highlights:** Measure tilt angles 0-359 degrees, Display gradient percentage, Show sum angles (180/360), Theodolite mode, Set specified angle to zero

**Features:** Vision Pro support

**In-app purchases:** none


### GrayHawkOS

[App page](https://appshunter.io/ios/app/grayhawkos/id6808045276)

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

**In-app purchases:** none


## Frequently asked questions

### Is Angle Gradient Inclinometer free?

Angle Gradient Inclinometer is free to download, with no in-app purchases.

### Is GrayHawkOS free?

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

### Do Angle Gradient Inclinometer or GrayHawkOS have ads?

Angle Gradient Inclinometer shows ads; GrayHawkOS does not.

### Which is updated more often, Angle Gradient Inclinometer or GrayHawkOS?

Angle Gradient Inclinometer ships an update every 8 months, and GrayHawkOS every 5 days. Most recently, Angle Gradient Inclinometer was updated on November 6, 2026 and GrayHawkOS 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.*