# SmartCalc+ Science Calculator vs Unit Eater

The clearest difference is ads: Unit Eater at none against SmartCalc+ Science Calculator's shown. Unit Eater also leads on update cadence (every 2 weeks vs every 5 weeks) and device support (4 vs 2). On price and in-app purchases there is nothing between them.

Both are free to download. SmartCalc+ Science Calculator sells 2 in-app purchases, starting at $0.99 per 7 days 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.

SmartCalc+ Science Calculator ships an update every 5 weeks, Unit Eater every 2 weeks. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | SmartCalc+ Science Calculator | Unit Eater |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 9 MB | 65 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Retenica SP Z.O.O](https://appshunter.io/developer/1715674718) | [Tom Leon Schmidt](https://appshunter.io/developer/1634212175) |

## What reviewers say

### SmartCalc+ Science Calculator

[App page](https://appshunter.io/ios/app/smartcalc-plus-science-calculator/id6483847331)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Access | $0.99 | per 7 days |
| Annual Premium Access | $9.99 | per year |


### 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 SmartCalc+ Science Calculator free?

SmartCalc+ Science Calculator is free to download, with in-app purchases available.

### Is Unit Eater free?

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

### Do SmartCalc+ Science Calculator or Unit Eater have ads?

SmartCalc+ Science Calculator shows ads; Unit Eater does not.

### Which is updated more often, SmartCalc+ Science Calculator or Unit Eater?

SmartCalc+ Science Calculator ships an update every 5 weeks, and Unit Eater every 2 weeks. Most recently, SmartCalc+ Science Calculator was updated on October 2, 2026 and Unit Eater on September 30, 2026.

---

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