# Octuple Calc vs Dark Digits

The clearest difference is ads: Dark Digits at none against Octuple Calc's shown. Octuple Calc's advantage is update cadence (every 2 weeks vs every 2 months) and device support (3 vs 1). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Octuple Calc ships an update every 2 weeks, Dark Digits every 2 months. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Octuple Calc | Dark Digits |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 36 MB | 4 MB |
| Requires iOS | **15.8.3** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [YMMV](https://appshunter.io/developer/1224453829) |

## What reviewers say

### Octuple Calc

[App page](https://appshunter.io/ios/app/octuple-calc/id6742039735)

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

**In-app purchases:** none


### Dark Digits

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Octuple Calc free?

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

### Is Dark Digits free?

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

### Do Octuple Calc or Dark Digits have ads?

Octuple Calc shows ads; Dark Digits does not.

### Which is updated more often, Octuple Calc or Dark Digits?

Octuple Calc ships an update every 2 weeks, and Dark Digits every 2 months. Most recently, Octuple Calc was updated on October 13, 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.*