# Sigma Notepad Calculator vs Orbit

The clearest difference is update cadence: Orbit at every 3 days against Sigma Notepad Calculator's every 4 weeks. Sigma Notepad Calculator's advantage is iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases 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 and Orbit sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Sigma Notepad Calculator ships an update every 4 weeks, Orbit every 3 days. The most recent releases landed on October 8, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Sigma Notepad Calculator | Orbit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/orbit-ai-second-brain/id6769115384/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 15 MB | 19 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Soules Studio Ltd](https://appshunter.io/developer/1883253392) | [Joshua Caleb Green](https://appshunter.io/developer/1887583729) |

## 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 |


### Orbit

[App page](https://appshunter.io/ios/app/orbit-ai-second-brain/id6769115384)

Capture and organize your thoughts, ideas, and moments effortlessly. This AI-powered tool creates a calm timeline of your life, offering daily recaps and the ability to search your memories. It integrates with Apple services for seamless capture and organization.

**Highlights:** Capture text, voice, photos, links, and locations, AI-powered organization and summarization, Daily recap of your day, Searchable memory recall, Task suggestion from memories, Reading list and habit tracking, Beautiful shareable memory cards

**Features:** macOS Compatibility, Safari Extension, Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Orbit Pro | $2.99 | per month |
| Orbit Pro | $29.99 | per year |
| Orbit Pro Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Sigma Notepad Calculator free?

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

### Is Orbit free?

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

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

Neither Sigma Notepad Calculator nor Orbit shows ads.

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

Sigma Notepad Calculator ships an update every 4 weeks, and Orbit every 3 days. Most recently, Sigma Notepad Calculator was updated on October 8, 2026 and Orbit on October 18, 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.*