# ExtCalc vs Formula Calculator #

The clearest difference is review sentiment: Formula Calculator # at 100% against ExtCalc's 0%. Formula Calculator # also leads on update cadence (every 5 weeks vs every 5 months) and iOS requirement (12.0 vs 18.7). ExtCalc's advantage is ads (none vs shown) and device support (6 vs 3). On price, in-app purchases and monetization model there is nothing between them.

Both are free to download. ExtCalc sells 2 in-app purchases, starting at $4.99 per year and Formula Calculator # sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ExtCalc ships an update every 5 months, Formula Calculator # every 5 weeks. The most recent releases landed on September 9, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | ExtCalc | Formula Calculator # |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/formula-calculator/id6504839903/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 7 MB | 67 MB |
| Requires iOS | 18.7 | **12.0** |
| 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) | [威 刘](https://appshunter.io/developer/1465235012) |

## 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 |


### Formula Calculator #

[App page](https://appshunter.io/ios/app/formula-calculator/id6504839903)

Perform calculations with a vast library of built-in formulas or create your own. Save and sync custom formulas to the cloud for easy access across devices. Includes a comprehensive scientific calculator.

**Highlights:** Extensive built-in calculation formulas, Create and save custom formulas, Cloud synchronization for custom formulas, Share custom formulas with others, Comprehensive scientific calculator

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month subscription | $1.49 | one-time |
| 3 months subscription | $2.49 | one-time |
| 6 months subscription | $3.49 | one-time |
| 1 year subscription | $4.49 | one-time |


## Frequently asked questions

### Is ExtCalc free?

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

### Is Formula Calculator # free?

Formula Calculator # is free to download, with in-app purchases available.

### Do ExtCalc or Formula Calculator # have ads?

Formula Calculator # shows ads; ExtCalc does not.

### Which is updated more often, ExtCalc or Formula Calculator #?

ExtCalc ships an update every 5 months, and Formula Calculator # every 5 weeks. Most recently, ExtCalc was updated on September 9, 2026 and Formula Calculator # on September 14, 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.*