# ExtCalc vs CTviewer+

The clearest difference is in-app purchases: CTviewer+ at none against ExtCalc's 2. CTviewer+ also leads on iOS requirement (13.0 vs 18.7). ExtCalc's advantage is device support (6 vs 3). On price and ads there is nothing between them.

Both are free to download. ExtCalc sells 2 in-app purchases, starting at $4.99 per year. CTviewer+ asks for nothing beyond the download.

## The numbers

| Metric | ExtCalc | CTviewer+ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 217 MB |
| Requires iOS | 18.7 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Matthias Weber](https://appshunter.io/developer/386132193) | [YU BO HAN](https://appshunter.io/developer/1714916214) |

## What reviewers say

### ExtCalc

[App page](https://appshunter.io/ios/app/extcalc/id386132190)

This scientific calculator offers a colorized text view for formulas, allowing for individual calculation sheets and easy memorization of results. It features a customizable constants pool, VAT calculator, and cloud synchronization for seamless use across devices. Accessibility and team collaboration are also emphasized.

**Highlights:** Colorized formula view, Individual calculation sheets, Memorize results, Customizable constants pool, VAT calculator, Cloud synchronization, Apple Watch app

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly Subscription | $4.99 | per year |
| Printing | $0.99 | one-time |


### CTviewer+

[App page](https://appshunter.io/ios/app/ctviewer-plus/id6777899393)

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

**In-app purchases:** none


## Frequently asked questions

### Is ExtCalc free?

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

### Is CTviewer+ free?

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

### Do ExtCalc or CTviewer+ have ads?

Neither ExtCalc nor CTviewer+ shows ads.

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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.*