# IsI Calculator vs Calclassic

The clearest difference is device support: IsI Calculator at 4 against Calclassic's 2. IsI Calculator also leads on iOS requirement (9.0 vs 17.0). On price, update cadence, ads 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.

IsI Calculator ships an update fortnightly, Calclassic every 9 days. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | IsI Calculator | Calclassic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Size | 15 MB | 3 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dominic Barra](https://appshunter.io/developer/891093115) | [Yutaka Taketoshi](https://appshunter.io/developer/1499650278) |

## What reviewers say

### IsI Calculator

[App page](https://appshunter.io/ios/app/isi-calculator/id891516315)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calclassic

[App page](https://appshunter.io/ios/app/calclassic/id1502906018)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IsI Calculator free?

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

### Is Calclassic free?

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

### Do IsI Calculator or Calclassic have ads?

Neither IsI Calculator nor Calclassic shows ads.

### Which is updated more often, IsI Calculator or Calclassic?

IsI Calculator ships an update fortnightly, and Calclassic every 9 days. Most recently, IsI Calculator was updated on October 26, 2026 and Calclassic on October 27, 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.*