# GUTCalc Physics Unit Converter vs Propagation Tools

The clearest difference is price: GUTCalc Physics Unit Converter at Free against Propagation Tools's $0.29. GUTCalc Physics Unit Converter also leads on update cadence (every 4 months vs every 9 months) and device support (4 vs 2). Propagation Tools's advantage is in-app purchases (none vs 1). On ads there is nothing between them.

GUTCalc Physics Unit Converter is free to download; Propagation Tools costs $0.29 up front. GUTCalc Physics Unit Converter sells 1 one-off in-app purchase. Propagation Tools asks for nothing beyond the download.

GUTCalc Physics Unit Converter ships an update every 4 months, Propagation Tools every 9 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | GUTCalc Physics Unit Converter | Propagation Tools |
| --- | --- | --- |
| Price | **Free** | $0.29 |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/gutcalc-physics-unit-converter/id1526914857/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 1 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Timothy Wiser](https://appshunter.io/developer/1526914859) | [Jeff Curtis](https://appshunter.io/developer/358219019) |

## What reviewers say

### GUTCalc Physics Unit Converter

[App page](https://appshunter.io/ios/app/gutcalc-physics-unit-converter/id1526914857)

This calculator handles complex physics calculations with units. It supports SI, natural, and CGS units, physical constants, and functions. It automatically converts units and flags algebraic errors, with an option to upgrade for advanced organization and syncing features.

**Highlights:** SI, Natural, and CGS unit modes, Automatic unit conversion, Physical constants and functions, Implied multiplication, Custom keyboards, Unit checking for algebraic errors, Share and save results

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GUTCalc Pro | $2.99 | one-time |


### Propagation Tools

[App page](https://appshunter.io/ios/app/propagation-tools/id6446221936)

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

**In-app purchases:** none


## Frequently asked questions

### Is GUTCalc Physics Unit Converter free?

GUTCalc Physics Unit Converter is free to download, with in-app purchases available.

### Is Propagation Tools free?

Propagation Tools costs $0.29, with no in-app purchases.

### Do GUTCalc Physics Unit Converter or Propagation Tools have ads?

Neither GUTCalc Physics Unit Converter nor Propagation Tools shows ads.

### Which is updated more often, GUTCalc Physics Unit Converter or Propagation Tools?

GUTCalc Physics Unit Converter ships an update every 4 months, and Propagation Tools every 9 months. Most recently, GUTCalc Physics Unit Converter was updated on November 3, 2026 and Propagation Tools on October 27, 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.*