# Kalc vs Unit Eater

The clearest difference is in-app purchases: Kalc at none against Unit Eater's 2. Unit Eater's advantage is device support (4 vs 2). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Unit Eater sells 2 in-app purchases, starting at $0.99 per month. Kalc asks for nothing beyond the download.

Kalc ships an update every 9 days, Unit Eater every 2 weeks. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Kalc | Unit Eater |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/kalc/id610991936/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 96.2% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 24 MB | 65 MB |
| Requires iOS | 13.4 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [YUTA OKAJIMA](https://appshunter.io/developer/610991939) | [Tom Leon Schmidt](https://appshunter.io/developer/1634212175) |

## What reviewers say

### Kalc

[App page](https://appshunter.io/ios/app/kalc/id610991936)

This utility app offers a unit converter, calculator, and world clock. Its user-friendly interface is designed for quick access to everyday calculations and conversions.

**Highlights:** Unit converter, Calculator, World clock, Simple UI, Quick results

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Kalc free?

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

### Is Unit Eater free?

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

### Do Kalc or Unit Eater have ads?

Neither Kalc nor Unit Eater shows ads.

### Which is updated more often, Kalc or Unit Eater?

Kalc ships an update every 9 days, and Unit Eater every 2 weeks. Most recently, Kalc was updated on October 23, 2026 and Unit Eater on October 16, 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.*