# Cat® GRADE Assistant vs Propeller Mobile

The clearest difference is update cadence: Propeller Mobile at every 2 weeks against Cat® GRADE Assistant's every 8 months. Cat® GRADE Assistant's advantage is iOS requirement (14.0 vs 16.1). On price, ads, 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.

Cat® GRADE Assistant ships an update every 8 months, Propeller Mobile every 2 weeks. The most recent releases landed on September 20, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Cat® GRADE Assistant | Propeller Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (10 ratings)](https://appshunter.io/ios/app/propeller-mobile-3d-mapping/id1644272004/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 38 MB | 214 MB |
| Requires iOS | **14.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Caterpillar Inc.](https://appshunter.io/developer/571668770) | [Propeller Aerobotics Pty Ltd](https://appshunter.io/developer/1077083929) |

## What reviewers say

### Cat® GRADE Assistant

[App page](https://appshunter.io/ios/app/cat-grade-assistant/id1604853064)

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

**In-app purchases:** none


### Propeller Mobile

[App page](https://appshunter.io/ios/app/propeller-mobile-3d-mapping/id1644272004)

This app provides field crews with a mobile 3D site inspection tool. It enables real-time navigation, site checks, and data capture to facilitate faster decision-making and keep projects on track.

**Highlights:** Live navigation, 3D site mapping, Media documentation, Grade checking, Cut-fill analysis, Surface area measurement, Stockpile volumes

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

**In-app purchases:** none


## Frequently asked questions

### Is Cat® GRADE Assistant free?

Cat® GRADE Assistant is free to download, with no in-app purchases.

### Is Propeller Mobile free?

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

### Do Cat® GRADE Assistant or Propeller Mobile have ads?

Neither Cat® GRADE Assistant nor Propeller Mobile shows ads.

### Which is updated more often, Cat® GRADE Assistant or Propeller Mobile?

Cat® GRADE Assistant ships an update every 8 months, and Propeller Mobile every 2 weeks. Most recently, Cat® GRADE Assistant was updated on September 20, 2026 and Propeller Mobile on September 13, 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.*