ExtCalc vs Colorgen
Price, ratings, monetisation and update history for both apps, side by side โ 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
Colorgen
Easily find HTML color codes by name or color. Get detailed color information including RGB, CMYK, and HSL values. Convert between decimal, binary, and hexadecimal formats.
- Search by HTML color code
- Search by color name
- View RGB, CMYK, HSL values
- Convert between decimal, binary, hexadecimal
- Web-safe color search
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In addition to searching for HTML color codes, you can also search by color name, web-safe color, and other categories. You can also check each color's RGB, CMYK, HSL, HSV, X11 name, and HTML color group. In addition, a function to convert between decimal, binary, and hexadecimal has been added.
Screenshots
Verdict
The clearest difference is review sentiment: Colorgen at 100% against ExtCalc's 0%. Colorgen also leads on in-app purchases (none vs 2) and update cadence (every 2 months vs every 5 months). ExtCalc's advantage is device support (6 vs 4). On price, ads and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. ExtCalc sells 2 in-app purchases, starting at $4.99 per year. Colorgen asks for nothing beyond the download.
ExtCalc ships an update every 5 months, Colorgen every 2 months. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.
| Parameter | ExtCalc | Colorgen |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | 100.0% of reviews โ better |
| Update frequency | Every 5 months | Every 2 months โ better |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Monetization | Free with in-app purchases | Free โ better |
| Devices | iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro โ better | iPhone, iPad, Mac, Vision Pro |
| Requires iOS | 18.7 | 18.6 โ better |
| Further details โ not scored | ||
| Size | 7 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthias Weber | Kazuhisa Asakawa |
Customer experience
ExtCalc
Colorgen
In-app purchases
ExtCalc
- Yearly Subscription$4.991 Year
- Printing$0.99
Colorgen
No in-app purchases









