# Expressions Calculator vs PrepShield

The clearest difference is update cadence: PrepShield at every 2 days against Expressions Calculator's monthly. Expressions Calculator's advantage is device support (4 vs 2) and iOS requirement (12.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Expressions Calculator ships an update monthly, PrepShield every 2 days. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Expressions Calculator | PrepShield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/expressions-calculator/id423294430/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free | — |
| Size | 13 MB | 12 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Andrei Salavei](https://appshunter.io/developer/1182076383) | [CHRISTOPHER BRADLEY WOOD](https://appshunter.io/developer/1878382042) |

## What reviewers say

### Expressions Calculator

[App page](https://appshunter.io/ios/app/expressions-calculator/id423294430)

A user-friendly calculator app for everyday tasks. It handles complex calculations with high accuracy, offers currency and unit conversions, and includes equation solving capabilities. The app also features a full history and undo/redo functions.

**Highlights:** High-accuracy math expressions, Currency converter (including Bitcoin), Measurement unit converter (50+ units), Percent calculations, Linear and trigonometric equation solver (Beta), Extensive mathematical functions, Full history with undo/redo

**In-app purchases:** none


### PrepShield

[App page](https://appshunter.io/ios/app/prepshield/id6761011335)

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

**In-app purchases:** none


## Frequently asked questions

### Is Expressions Calculator free?

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

### Is PrepShield free?

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

### Do Expressions Calculator or PrepShield have ads?

Neither Expressions Calculator nor PrepShield shows ads.

### Which is updated more often, Expressions Calculator or PrepShield?

Expressions Calculator ships an update monthly, and PrepShield every 2 days. Most recently, Expressions Calculator was updated on October 23, 2026 and PrepShield on October 11, 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.*