# OmniCalc vs Three9x

The clearest difference is update cadence: OmniCalc at every 3 days against Three9x's every 5 weeks. Three9x's advantage is iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OmniCalc ships an update every 3 days, Three9x every 5 weeks. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OmniCalc | Three9x |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/omnicalc-calculator-and-notes/id6760615662/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 weeks |
| Monetization | Free | — |
| Size | 4 MB | 496 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [飞龙 杨](https://appshunter.io/developer/1686016407) | [THREE9X (SMC-PRIVATE) LIMITED](https://appshunter.io/developer/6782750724) |

## What reviewers say

### OmniCalc

[App page](https://appshunter.io/ios/app/omnicalc-calculator-and-notes/id6760615662)

This calculator app allows you to add notes to numbers and calculations, group related results for easy totaling, and keep projects separate. It features a searchable history and customizable appearance options for everyday math needs.

**Highlights:** Add notes to numbers and calculations, Total multiple results with one tap, Keep projects separate with calculation pages, Searchable and reusable calculation history, Live result previews and customizable appearance, Offline functionality

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

**In-app purchases:** none


### Three9x

[App page](https://appshunter.io/ios/app/three9x/id6782750722)

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

**In-app purchases:** none


## Frequently asked questions

### Is OmniCalc free?

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

### Is Three9x free?

Three9x is free to download, with no in-app purchases.

### Do OmniCalc or Three9x have ads?

Neither OmniCalc nor Three9x shows ads.

### Which is updated more often, OmniCalc or Three9x?

OmniCalc ships an update every 3 days, and Three9x every 5 weeks. Most recently, OmniCalc was updated on October 31, 2026 and Three9x 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.*