# Scientific CalcX vs Dark Digits

The clearest difference is price: Dark Digits at Free against Scientific CalcX's $1.99. Dark Digits also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 8 months). On ads, device support and iOS requirement there is nothing between them.

Dark Digits is free to download; Scientific CalcX costs $1.99 up front. Scientific CalcX sells 1 one-off in-app purchase. Dark Digits asks for nothing beyond the download.

Scientific CalcX ships an update every 8 months, Dark Digits every 2 months. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Scientific CalcX | Dark Digits |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Size | 2 MB | 4 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Lake Snow Technology Co., Ltd.](https://appshunter.io/developer/1439688130) | [YMMV](https://appshunter.io/developer/1224453829) |

## What reviewers say

### Scientific CalcX

[App page](https://appshunter.io/ios/app/scientific-calcx/id1439688401)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific CalcX Premium | $3.99 | one-time |


### Dark Digits

[App page](https://appshunter.io/ios/app/dark-digits/id6744330793)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Scientific CalcX free?

Scientific CalcX costs $1.99, and also offers in-app purchases.

### Is Dark Digits free?

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

### Do Scientific CalcX or Dark Digits have ads?

Neither Scientific CalcX nor Dark Digits shows ads.

### Which is updated more often, Scientific CalcX or Dark Digits?

Scientific CalcX ships an update every 8 months, and Dark Digits every 2 months. Most recently, Scientific CalcX was updated on October 12, 2026 and Dark Digits on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*