# Custom Unit Converter vs PhysicsCalc

The clearest difference is price: Custom Unit Converter at Free against PhysicsCalc's $19.99. Custom Unit Converter also leads on update cadence (fortnightly vs every 3 months). PhysicsCalc's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Custom Unit Converter is free to download; PhysicsCalc costs $19.99 up front. Custom Unit Converter sells 1 in-app purchase, starting at $0.49 per month and PhysicsCalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Custom Unit Converter ships an update fortnightly, PhysicsCalc every 3 months. The most recent releases landed on October 30, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Custom Unit Converter | PhysicsCalc |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/physicscalc-126-formulas/id6761487165/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | — | Freemium |
| Size | 12 MB | 10 MB |
| Requires iOS | 16.2 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tsuyoshi Ninomiya](https://appshunter.io/developer/1840418816) | [Rustam Elmuradov](https://appshunter.io/developer/1889905226) |

## What reviewers say

### Custom Unit Converter

[App page](https://appshunter.io/ios/app/custom-unit-converter-myunit/id6752657586)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MyUnit | $0.49 | per month |


### PhysicsCalc

[App page](https://appshunter.io/ios/app/physicscalc-126-formulas/id6761487165)

This app provides a comprehensive collection of physics formulas, calculations, and solutions. It offers a unit converter, physical constants, and history of calculations, with advanced features like dependency graphs and error calculation available via a one-time purchase.

**Highlights:** 126 physics formulas, Smart calculation with instant results, Step-by-step solutions, Unit converter, Physical constants, Dependency graphs, Error calculator

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Formulas | $1.99 | one-time |


## Frequently asked questions

### Is Custom Unit Converter free?

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

### Is PhysicsCalc free?

PhysicsCalc costs $19.99, and also offers in-app purchases.

### Do Custom Unit Converter or PhysicsCalc have ads?

Custom Unit Converter shows ads; PhysicsCalc does not.

### Which is updated more often, Custom Unit Converter or PhysicsCalc?

Custom Unit Converter ships an update fortnightly, and PhysicsCalc every 3 months. Most recently, Custom Unit Converter was updated on October 30, 2026 and PhysicsCalc on October 19, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*