# Calculator 4U vs Sigma Notepad Calculator

The clearest difference is in-app purchases: Calculator 4U at none against Sigma Notepad Calculator's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. Calculator 4U asks for nothing beyond the download.

Calculator 4U ships an update every 3 weeks, Sigma Notepad Calculator fortnightly. The most recent releases landed on October 6, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calculator 4U | Sigma Notepad Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Size | 2 MB | 16 MB |
| Requires iOS | 18.2 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Naseer Mohammed](https://appshunter.io/developer/1794812503) | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) |

## 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


### Sigma Notepad Calculator

[App page](https://appshunter.io/ios/app/sigma-notepad-calculator/id6768903761)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $14.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Calculator 4U free?

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

### Is Sigma Notepad Calculator free?

Sigma Notepad Calculator is free to download, with in-app purchases available.

### Do Calculator 4U or Sigma Notepad Calculator have ads?

Neither Calculator 4U nor Sigma Notepad Calculator shows ads.

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

Calculator 4U ships an update every 3 weeks, and Sigma Notepad Calculator fortnightly. Most recently, Calculator 4U was updated on October 6, 2026 and Sigma Notepad Calculator on October 25, 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.*