# basalt vs Sigma Notepad Calculator

The clearest difference is iOS requirement: Sigma Notepad Calculator at 17.0 against basalt's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. basalt sells 2 in-app purchases, starting at $0.99 per 7 days 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.

basalt ships an update every 10 days, Sigma Notepad Calculator fortnightly. The most recent releases landed on October 28, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | basalt | Sigma Notepad Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Fortnightly |
| Size | 11 MB | 19 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Igor Diachuk](https://appshunter.io/developer/1745656090) | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) |

## What reviewers say

### basalt

[App page](https://appshunter.io/ios/app/basalt-ai-notes/id6754186830)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basalt Weekly | $0.99 | per 7 days |
| Basalt Yearly | $12.99 | per year |


### 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 basalt free?

basalt 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 basalt or Sigma Notepad Calculator have ads?

Neither basalt nor Sigma Notepad Calculator shows ads.

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

basalt ships an update every 10 days, and Sigma Notepad Calculator fortnightly. Most recently, basalt was updated on October 28, 2026 and Sigma Notepad Calculator on November 9, 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.*