# InkCalc vs Sigma Notepad Calculator

The clearest difference is device support: InkCalc at 3 against Sigma Notepad Calculator's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. InkCalc sells 1 in-app purchase, starting at $1.99 per month and Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

InkCalc ships an update fortnightly, Sigma Notepad Calculator every 2 weeks. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | InkCalc | Sigma Notepad Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Size | 2 MB | 18 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [KENTARO SOGA](https://appshunter.io/developer/1883580671) | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) |

## What reviewers say

### InkCalc

[App page](https://appshunter.io/ios/app/inkcalc-notepad-calculator/id6763837608)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| InkCalc Monthly | $1.99 | per month |


### 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 InkCalc free?

InkCalc is free to download, with in-app purchases available.

### Is Sigma Notepad Calculator free?

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

### Do InkCalc or Sigma Notepad Calculator have ads?

Neither InkCalc nor Sigma Notepad Calculator shows ads.

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

InkCalc ships an update fortnightly, and Sigma Notepad Calculator every 2 weeks. Most recently, InkCalc was updated on October 28, 2026 and Sigma Notepad Calculator on October 31, 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.*