# Octuple Calc vs Smart Instant Calculator

The clearest difference is update cadence: Octuple Calc at every 2 weeks against Smart Instant Calculator's every 2 months. Octuple Calc also leads on iOS requirement (15.8.3 vs 18.0). On price, ads, in-app purchases and device support 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, Smart Instant Calculator every 2 months. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Octuple Calc | Smart Instant Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 36 MB | 8 MB |
| Requires iOS | **15.8.3** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Ichi Hosotsuji](https://appshunter.io/developer/1808829369) |

## 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


### Smart Instant Calculator

[App page](https://appshunter.io/ios/app/smart-instant-calculator/id6749926057)

**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 Smart Instant Calculator free?

Smart Instant Calculator is free to download, with no in-app purchases.

### Do Octuple Calc or Smart Instant Calculator have ads?

Both Octuple Calc and Smart Instant Calculator show ads.

### Which is updated more often, Octuple Calc or Smart Instant Calculator?

Octuple Calc ships an update every 2 weeks, and Smart Instant Calculator every 2 months. Most recently, Octuple Calc was updated on October 28, 2026 and Smart Instant Calculator on October 25, 2026.

---

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