# Scientific CalcX vs Unit Eater

The clearest difference is price: Unit Eater at Free against Scientific CalcX's $1.99. Unit Eater also leads on update cadence (every 2 weeks vs every 8 months) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

Unit Eater is free to download; Scientific CalcX costs $1.99 up front. Scientific CalcX sells 1 one-off in-app purchase and Unit Eater sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Scientific CalcX ships an update every 8 months, Unit Eater every 2 weeks. The most recent releases landed on October 12, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Scientific CalcX | Unit Eater |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 65 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Lake Snow Technology Co., Ltd.](https://appshunter.io/developer/1439688130) | [Tom Leon Schmidt](https://appshunter.io/developer/1634212175) |

## What reviewers say

### Scientific CalcX

[App page](https://appshunter.io/ios/app/scientific-calcx/id1439688401)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific CalcX Premium | $3.99 | one-time |


### Unit Eater

[App page](https://appshunter.io/ios/app/unit-eater/id6742549723)

This utility app functions as a powerful calculator that handles unit conversions and calculations. It supports a vast array of predefined units and allows users to define their own, making it ideal for scientific and academic tasks. Features include a calculation history, customizable results, and dark mode.

**Highlights:** Unit conversion and calculation, Custom unit definition, Extensive unit library, Calculation history, Customizable result format, Dark mode

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Monthly | $0.99 | per month |
| Premium - Pay once | $3.99 | one-time |


## Frequently asked questions

### Is Scientific CalcX free?

Scientific CalcX costs $1.99, and also offers in-app purchases.

### Is Unit Eater free?

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

### Do Scientific CalcX or Unit Eater have ads?

Neither Scientific CalcX nor Unit Eater shows ads.

### Which is updated more often, Scientific CalcX or Unit Eater?

Scientific CalcX ships an update every 8 months, and Unit Eater every 2 weeks. Most recently, Scientific CalcX was updated on October 12, 2026 and Unit Eater on September 30, 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.*