# Aufmaster vs O3 ONField

The clearest difference is rating: O3 ONField at 5.0 against Aufmaster's 4.3. O3 ONField also leads on device support (3 vs 1) and iOS requirement (15.0 vs 26.0). Aufmaster's advantage is ratings volume (4 vs 1). 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.

O3 ONField holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Aufmaster ships an update every 4 weeks, O3 ONField fortnightly. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Aufmaster | O3 ONField |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/aufmaster/id6743626575/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/o3-onfield/id6748837231/reviews)** |
| Number of ratings | **4** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 69 MB | 35 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aufmaster](https://appshunter.io/developer/1803611569) | [O3 Solutions](https://appshunter.io/developer/1449739669) |

## What reviewers say

### Aufmaster

[App page](https://appshunter.io/ios/app/aufmaster/id6743626575)

Streamline cable measurement and documentation with your iPhone and a digital measuring device. Quickly record lengths, locations, and project details, and manage inventory efficiently, eliminating the need for paper records.

**Highlights:** Digital cable length measurement via iPhone + AM1, Document measurements with time, location, and user, Offline measurements with later sync, Inventory and warehouse management, Cloud account for project and inventory overview

**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 Aufmaster free?

Aufmaster 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, Aufmaster or O3 ONField?

O3 ONField is rated higher. Aufmaster averages 4.3 out of 5 from 4 ratings, while O3 ONField averages 5.0 from 1 ratings.

### Do Aufmaster or O3 ONField have ads?

Neither Aufmaster nor O3 ONField shows ads.

### Which is updated more often, Aufmaster or O3 ONField?

Aufmaster ships an update every 4 weeks, and O3 ONField fortnightly. Most recently, Aufmaster was updated on October 12, 2026 and O3 ONField on October 16, 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.*