# Assemble Mobile vs O3 ONField

The clearest difference is rating: O3 ONField at 5.0 against Assemble Mobile's 4.5. O3 ONField also leads on update cadence (fortnightly vs every 2 months). Assemble Mobile's advantage is ratings volume (23 vs 1) and iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

O3 ONField holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Assemble Mobile has 23 ratings behind it against 1, so its average is the more settled of the two.

Assemble Mobile ships an update every 2 months, O3 ONField fortnightly. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Assemble Mobile | O3 ONField |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (23 ratings)](https://appshunter.io/ios/app/assemble-mobile/id1304791238/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o3-onfield/id6748837231/reviews)** |
| Number of ratings | **23** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 39 MB | 34 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Assemble Systems](https://appshunter.io/developer/1304791237) | [O3 Insight, Inc.](https://appshunter.io/developer/1449739669) |

## What reviewers say

### Assemble Mobile

[App page](https://appshunter.io/ios/app/assemble-mobile/id1304791238)

Access and interact with federated building information models in 3D, even offline. Navigate complex models, view properties, take measurements, and implement custom workflows with ease.

**Highlights:** Offline access to projects and models, 3D model navigation and interrogation, Isolate objects and rooms, View, update, and search model properties, Measure lengths and areas, Scan barcodes for object selection

**Features:** macOS Compatibility

**In-app purchases:** none


### O3 ONField

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

This mobile application extends a capital project management platform to job sites. It supports industry-leading practices and enables key workflows like IWP progressing even in offline or low-connectivity environments.

**Highlights:** Mobile access to capital project management, Supports AWP, Agile, and Lean practices, Offline workflow capabilities, IWP progressing, Jobsite productivity enhancement

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

**In-app purchases:** none


## Frequently asked questions

### Is Assemble Mobile free?

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

### Is O3 ONField free?

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

### Which has better reviews, Assemble Mobile or O3 ONField?

O3 ONField is rated higher. Assemble Mobile averages 4.5 out of 5 from 23 ratings, while O3 ONField averages 5.0 from 1 ratings.

### Do Assemble Mobile or O3 ONField have ads?

Neither Assemble Mobile nor O3 ONField shows ads.

### Which is updated more often, Assemble Mobile or O3 ONField?

Assemble Mobile ships an update every 2 months, and O3 ONField fortnightly. Most recently, Assemble Mobile was updated on October 24, 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.*