# Machine Defender vs O3 ONField

The clearest difference is update cadence: O3 ONField at fortnightly against Machine Defender's every 8 months. Machine Defender's advantage is iOS requirement (12.1 vs 15.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Machine Defender against 5.0 for O3 ONField. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Machine Defender ships an update every 8 months, O3 ONField fortnightly. The most recent releases landed on November 5, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Machine Defender | O3 ONField |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/machine-defender/id1496754747/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/o3-onfield/id6748837231/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 274 MB | 34 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ACOEM Group](https://appshunter.io/developer/1495816959) | [O3 Solutions](https://appshunter.io/developer/1449739669) |

## What reviewers say

### Machine Defender

[App page](https://appshunter.io/ios/app/machine-defender/id1496754747)

This app, used with a wireless vibration sensor, collects and analyzes vibration data from industrial rotating machinery. It automatically detects faults in components like motors and pumps, providing diagnostic reports and maintenance recommendations.

**Highlights:** Wireless vibration data collection, Automatic fault detection with AI, Machine health assessment, Maintenance recommendations, Report storage and sharing, Cloud platform connectivity

**Features:** macOS Compatibility

**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 Machine Defender free?

Machine Defender 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, Machine Defender or O3 ONField?

Machine Defender and O3 ONField are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Machine Defender or O3 ONField have ads?

Neither Machine Defender nor O3 ONField shows ads.

### Which is updated more often, Machine Defender or O3 ONField?

Machine Defender ships an update every 8 months, and O3 ONField fortnightly. Most recently, Machine Defender was updated on November 5, 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.*