# Sigma Notepad Calculator vs visualOS

The clearest difference is price: Sigma Notepad Calculator at Free against visualOS's $12.99. visualOS's advantage is in-app purchases (none vs 3) and update cadence (every 6 days vs fortnightly). On ads there is nothing between them.

Sigma Notepad Calculator is free to download; visualOS costs $12.99 up front. Sigma Notepad Calculator sells 3 in-app purchases, starting at $1.99 per month. visualOS asks for nothing beyond the download.

Sigma Notepad Calculator ships an update fortnightly, visualOS every 6 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Sigma Notepad Calculator | visualOS |
| --- | --- | --- |
| Price | **Free** | $12.99 |
| Rating | — | **[4.4 (5 ratings)](https://appshunter.io/ios/app/visualos-infinite-canvas/id6787359589/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Monetization | — | Paid |
| Best chart rank | — | **#115** |
| Size | 16 MB | 21 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) | [Dorweiler & Reimertz GbR](https://appshunter.io/developer/6775452184) |

## What reviewers say

### 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 |


### visualOS

[App page](https://appshunter.io/ios/app/visualos-infinite-canvas/id6787359589)

**Currently charting:** #115 Top Paid · Productivity (US App Store)

This app offers an infinite canvas for visual thinkers, organizing notes, folders, images, and to-do lists. It works entirely offline, saving your data as real files in a folder on your device, which can then sync via your cloud service.

**Highlights:** Infinite canvas for visual thinking, Offline access and real file saving, Syncs with your own cloud storage, Organize notes, images, and to-dos, Hierarchical boards within boards, Markdown file support, Freehand drawing and magnetic arrows

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

**In-app purchases:** none


## Frequently asked questions

### Is Sigma Notepad Calculator free?

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

### Is visualOS free?

visualOS costs $12.99, with no in-app purchases.

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

Neither Sigma Notepad Calculator nor visualOS shows ads.

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

Sigma Notepad Calculator ships an update fortnightly, and visualOS every 6 days. Most recently, Sigma Notepad Calculator was updated on October 25, 2026 and visualOS on October 28, 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.*