ExtCalc vs Formula Calculator #
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ExtCalc
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.
- Colorized formula view
- Individual calculation sheets
- Memorize results
- Customizable constants pool
- VAT calculator
- Cloud synchronization
- Apple Watch app
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ExtCalc is an innovative scientific calculator that makes operating computations easy. It shows your whole formula in a colorised text view. You can have different calculation sheets for different formulas or you just use one sheet for all your formulas. Deletion and memorizing results are integrated as well. Last, but not least, it includes a customizable constants pool and a VAT calculator. All nifty features in a short list: * Individual calculation sheets, with the possibility to print them * Color highlighting * Memorizing results, e.g. via the ANS button and through the calculation sheets, get old values by tapping on them in the sheet * Many functions, even in portrait mode * Grouping (brackets) * Error proof, you can't input formulas that would lead to errors * Constants pool, easily customizable * iCloud support for synchronization between devices * VAT calculator * Apple Watch app * Cloud synchronisation to stay up-to-date on all devices * AR scene * Print calculation sheets * Dark Mode * Strong focus on accessibility * SharePlay to work in a team Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://develicious-studios.de/privacy.html
Formula Calculator #
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.
- Extensive built-in calculation formulas
- Create and save custom formulas
- Cloud synchronization for custom formulas
- Share custom formulas with others
- Comprehensive scientific calculator
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The formula calculator comes with a wide range of built-in calculation formulas, allowing you to complete calculations simply by entering the required parameters. It also features built-in custom formulas, catering to individual needs. Once a custom formula is set up, you only need to input the parameters during your next calculation to quickly obtain the results, thereby improving efficiency. Moreover, you can share your custom formulas with friends or other devices for convenient calculations. After logging in with your account, you can synchronize your custom formulas to the cloud to prevent any loss. Additionally, it includes a comprehensive scientific calculator that meets various calculation needs.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ExtCalc | Formula Calculator # |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro — better | iPhone, iPad, iPod |
| Requires iOS | 18.7 | 12.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthias Weber | 威 刘 |
Customer experience
ExtCalc
Formula Calculator #
In-app purchases
ExtCalc
- Yearly Subscription$4.991 Year
- Printing$0.99
Formula Calculator #
- 1 month subscription$1.49
- 3 months subscription$2.49
- 6 months subscription$3.49
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- 1 year subscription$4.49









