# Calca vs Due2

The clearest difference is price: Due2 at Free against Calca's $9.99. Due2 also leads on update cadence (weekly vs every 5 months). Calca's advantage is chart position (#89 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Due2 is free to download; Calca costs $9.99 up front. Calca sells 2 one-off in-app purchases and Due2 sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

Calca ships an update every 5 months, Due2 weekly. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Calca | Due2 |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.5 (153 ratings)](https://appshunter.io/ios/app/calca/id635757879/reviews)** | — |
| Number of ratings | **153** | — |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#89** | — |
| Size | 78 MB | 51 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Krueger Systems, Inc.](https://appshunter.io/developer/299293363) | [MyIAM Inc.](https://appshunter.io/developer/1894086028) |

## What reviewers say

### Calca

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

**Currently charting:** #89 Top Paid · Productivity (US App Store)

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


### Due2

[App page](https://appshunter.io/ios/app/due2-deadline-reminder/id6762415763)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Due2 Plus | $9.99 | per year |
| Due2 Pro | $19.99 | per year |


## Frequently asked questions

### Is Calca free?

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

### Is Due2 free?

Due2 is free to download, with in-app purchases available.

### Do Calca or Due2 have ads?

Neither Calca nor Due2 shows ads.

### Which is updated more often, Calca or Due2?

Calca ships an update every 5 months, and Due2 weekly. Most recently, Calca was updated on October 17, 2026 and Due2 on October 13, 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.*