# Calculator 4U vs Calto

The clearest difference is update cadence: Calto at every 9 days against Calculator 4U's every 3 weeks. Calto also leads on device support (3 vs 1) and iOS requirement (15.6 vs 18.2). On price, 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.

Calculator 4U ships an update every 3 weeks, Calto every 9 days. The most recent releases landed on October 28, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Calculator 4U | Calto |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Size | 2 MB | 30 MB |
| Requires iOS | 18.2 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Naseer Mohammed](https://appshunter.io/developer/1794812503) | [JONGWOO PARK](https://appshunter.io/developer/1873952653) |

## What reviewers say

### Calculator 4U

[App page](https://appshunter.io/ios/app/calculator-4u/id6741595255)

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

**In-app purchases:** none


### Calto

[App page](https://appshunter.io/ios/app/calto-note-calculator/id6758614596)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calculator 4U free?

Calculator 4U is free to download, with no in-app purchases.

### Is Calto free?

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

### Do Calculator 4U or Calto have ads?

Neither Calculator 4U nor Calto shows ads.

### Which is updated more often, Calculator 4U or Calto?

Calculator 4U ships an update every 3 weeks, and Calto every 9 days. Most recently, Calculator 4U was updated on October 28, 2026 and Calto on October 12, 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.*