# Calendar vs Square Root Pro

The clearest difference is price: Square Root Pro at Free against Calendar's $31.99. Square Root Pro also leads on update cadence (every 8 months vs every 31 months). Calendar's advantage is ads (none vs shown) and iOS requirement (15.6 vs 17.6). On in-app purchases and device support there is nothing between them.

Square Root Pro is free to download; Calendar costs $31.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calendar ships an update every 31 months, Square Root Pro every 8 months. The most recent releases landed on October 18, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Calendar | Square Root Pro |
| --- | --- | --- |
| Price | $31.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/square-root-pro/id1621600446/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 31 months | **Every 8 months** |
| Monetization | — | Ad-supported |
| Size | 1 MB | 30 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Martin Eisele](https://appshunter.io/developer/1099492467) | [Thomas Bradshaw](https://appshunter.io/developer/1360674639) |

## What reviewers say

### Calendar

[App page](https://appshunter.io/ios/app/calendar-trainer/id1293920342)

**In-app purchases:** none


### Square Root Pro

[App page](https://appshunter.io/ios/app/square-root-pro/id1621600446)

This app helps you mentally calculate square roots to two decimal places. It supports multiple languages and an internationalized numeric system for global users.

**Highlights:** Mental square root calculation, Accuracy to 2 decimal places, Multilingual support (English, Spanish, French, German, Chinese), Internationalized numeric system, Educational tool for math and science

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

**In-app purchases:** none


## Frequently asked questions

### Is Calendar free?

Calendar costs $31.99, with no in-app purchases.

### Is Square Root Pro free?

Square Root Pro is free to download, with no in-app purchases.

### Do Calendar or Square Root Pro have ads?

Square Root Pro shows ads; Calendar does not.

### Which is updated more often, Calendar or Square Root Pro?

Calendar ships an update every 31 months, and Square Root Pro every 8 months. Most recently, Calendar was updated on October 18, 2026 and Square Root Pro on October 8, 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.*