# OmegaBoard vs Sigma

The clearest difference is price: Sigma at Free against OmegaBoard's $8.99. Sigma also leads on in-app purchases (none vs 1) and update cadence (every 4 days vs every 9 days). On ads, device support and iOS requirement there is nothing between them.

Sigma is free to download; OmegaBoard costs $8.99 up front. OmegaBoard sells 1 in-app purchase, starting at $4.99 per month. Sigma asks for nothing beyond the download.

OmegaBoard ships an update every 9 days, Sigma every 4 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | OmegaBoard | Sigma |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 4 days** |
| Size | 17 MB | 7 MB |
| Requires iOS | 18.5 | **18.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Marc Super](https://appshunter.io/developer/1792449328) | [MAJOR Productions LLC](https://appshunter.io/developer/1885618341) |

## What reviewers say

### OmegaBoard

[App page](https://appshunter.io/ios/app/omegaboard/id6751167596)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Omega Board Pro Subscription | $4.99 | per month |


### Sigma

[App page](https://appshunter.io/ios/app/sigma-calculator/id6760669373)

**In-app purchases:** none


## Frequently asked questions

### Is OmegaBoard free?

OmegaBoard costs $8.99, and also offers in-app purchases.

### Is Sigma free?

Sigma is free to download, with no in-app purchases.

### Do OmegaBoard or Sigma have ads?

Neither OmegaBoard nor Sigma shows ads.

### Which is updated more often, OmegaBoard or Sigma?

OmegaBoard ships an update every 9 days, and Sigma every 4 days. Most recently, OmegaBoard was updated on October 25, 2026 and Sigma 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.*