# Calca vs ModTest Pro

The clearest difference is in-app purchases: ModTest Pro at none against Calca's 2. ModTest Pro also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Calca costs $9.99 and ModTest Pro $9.99 up front. Calca sells 2 one-off in-app purchases. ModTest Pro asks for nothing beyond the download.

Calca ships an update every 5 months, ModTest Pro every 2 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Calca | ModTest Pro |
| --- | --- | --- |
| Price | $9.99 | $9.99 |
| Rating | **[4.5 (157 ratings)](https://appshunter.io/ios/app/calca/id635757879/reviews)** | — |
| Number of ratings | **157** | — |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 78 MB | 26 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Krueger Systems, Inc.](https://appshunter.io/developer/299293363) | [Dohmann Engineering Services](https://appshunter.io/developer/401682475) |

## What reviewers say

### Calca

[App page](https://appshunter.io/ios/app/calca/id635757879)

This app is an advanced symbolic calculator and text editor. It solves equations, simplifies expressions, and allows you to explain your work alongside calculations. Calculations update instantly as you type, and all data is stored as plain text for easy sharing and device syncing.

**Highlights:** Symbolic calculation, Equation solving, Expression simplification, Markdown text editor, Real-time updates, Unit and currency conversion, Matrix operations

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6-Month Optional Patronage | $4.99 | one-time |
| 12-Month Optional Patronage | $7.99 | one-time |

**What reviewers like**

- 💡 Unique blend of text editor and calculator
- 📝 Markdown support for documentation
- 🔄 Dynamic recalculation of all values
- ⚙️ Powerful mathematical and algebraic capabilities
- 📊 Unit conversion and unit-aware calculations

**What reviewers complain about**

- 🐛 Magic Keyboard input bugs on iPad
- ⚠️ Appears abandoned or poorly maintained
- 🐛 Text selection issues with external keyboards
- 📱 iPad landscape mode problems
- 🐛 Cursor jumping and screen jumping during editing

**Reported bugs**

- Magic Keyboard causes number input to overwrite instead of append
- Text selection before numbers triggers increment/decrement instead of selecting
- Cursor jumps forward and backward with external keyboards
- iPad Pro keyboard truncation in portrait mode
- Arrow key (=>) doesn't work in landscape mode

**Requested features**

- Files app and document browser integration
- Dropbox and Google Drive support
- Date calculation functionality
- Looping and iteration support
- User-defined function storage in separate files


### ModTest Pro

[App page](https://appshunter.io/ios/app/modtest-pro/id1552784932)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calca free?

Calca costs $9.99, and also offers in-app purchases.

### Is ModTest Pro free?

ModTest Pro costs $9.99, with no in-app purchases.

### Do Calca or ModTest Pro have ads?

Neither Calca nor ModTest Pro shows ads.

### Which is updated more often, Calca or ModTest Pro?

Calca ships an update every 5 months, and ModTest Pro every 2 months. Most recently, Calca was updated on November 1, 2026 and ModTest Pro on October 31, 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.*