# ExtCalc vs Colorgen

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.

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.

## The numbers

| Metric | ExtCalc | Colorgen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 7 MB | 5 MB |
| Requires iOS | 18.7 | **18.6** |
| Devices | **iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro** | iPhone, iPad, Mac, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [Matthias Weber](https://appshunter.io/developer/386132193) | [Kazuhisa Asakawa](https://appshunter.io/developer/927996843) |

## 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 |


### Colorgen

[App page](https://appshunter.io/ios/app/colorgen-html-color-search/id961417428)

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.

**Highlights:** Search by HTML color code, Search by color name, View RGB, CMYK, HSL values, Convert between decimal, binary, hexadecimal, Web-safe color search

**In-app purchases:** none


## Frequently asked questions

### Is ExtCalc free?

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

### Is Colorgen free?

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

### Do ExtCalc or Colorgen have ads?

Neither ExtCalc nor Colorgen shows ads.

### Which is updated more often, ExtCalc or Colorgen?

ExtCalc ships an update every 5 months, and Colorgen every 2 months. Most recently, ExtCalc was updated on September 9, 2026 and Colorgen on June 1, 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.*