# LEO Rigging Calculator vs O3 ONField

The clearest difference is iOS requirement: LEO Rigging Calculator at 13.0 against O3 ONField's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

LEO Rigging Calculator ships an update every 3 weeks, O3 ONField fortnightly. Both last shipped on October 30, 2026.

## The numbers

| Metric | LEO Rigging Calculator | O3 ONField |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o3-onfield/id6748837231/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 61 MB | 34 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [CLAN LEO PRIVATE LIMITED](https://appshunter.io/developer/1738165463) | [O3 Solutions](https://appshunter.io/developer/1449739669) |

## What reviewers say

### LEO Rigging Calculator

[App page](https://appshunter.io/ios/app/leo-rigging-calculator/id6744311128)

This app provides quick solutions for everyday rigging calculations, assisting engineers and safety personnel in site surveys and rigging plan designs. It helps verify calculations, determine clearances, and analyze load distribution for safe lifting operations. Results can be exported to PDF for easy sharing.

**Highlights:** Boom clearance calculator, Tail load calculator, Wind speed calculator, Sling tension calculator, Percentage capacity calculator, Sling weight calculator, Axle load calculator, SPMT GBP load calculator

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

**In-app purchases:** none


### O3 ONField

[App page](https://appshunter.io/ios/app/o3-onfield/id6748837231)

Manage capital projects directly from your mobile device. This app supports industry-leading practices like Advanced Work Packaging (AWP), Agile, and Lean to boost team performance from planning to startup. It enables key workflows, such as IWP progressing, even when offline, ensuring productivity in low-connectivity jobsite environments.

**Highlights:** Mobile capital project management, Advanced Work Packaging (AWP) support, Agile and Lean methodologies, Offline IWP progressing, Jobsite productivity tools

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

**In-app purchases:** none


## Frequently asked questions

### Is LEO Rigging Calculator free?

LEO Rigging Calculator is free to download, with no in-app purchases.

### Is O3 ONField free?

O3 ONField is free to download, with no in-app purchases.

### Do LEO Rigging Calculator or O3 ONField have ads?

Neither LEO Rigging Calculator nor O3 ONField shows ads.

### Which is updated more often, LEO Rigging Calculator or O3 ONField?

LEO Rigging Calculator ships an update every 3 weeks, and O3 ONField fortnightly. Most recently, LEO Rigging Calculator was updated on October 30, 2026 and O3 ONField on October 30, 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.*