# Vertical Shaft Alignment vs O3 ONField

The clearest difference is update cadence: O3 ONField at fortnightly against Vertical Shaft Alignment's every 6 months. Vertical Shaft Alignment's advantage is iOS requirement (13.0 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 Vertical Shaft Alignment against 5.0 for O3 ONField. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Vertical Shaft Alignment ships an update every 6 months, O3 ONField fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Vertical Shaft Alignment | O3 ONField |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/vertical-shaft-alignment/id1499478849/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 6 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 94 MB | 34 MB |
| Requires iOS | **13.0** | 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

### Vertical Shaft Alignment

[App page](https://appshunter.io/ios/app/vertical-shaft-alignment/id1499478849)

This app guides users through the vertical shaft alignment process for motor and pump applications using specific Bluetooth-connected sensors. It facilitates measurement and alignment, and allows for instant PDF report generation on-site.

**Highlights:** Bluetooth sensor connectivity, Guided measurement and alignment process, Icon-based adaptive user interface, Instant PDF report generation, Works with RT-300/AT-200 sensors

**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 Vertical Shaft Alignment free?

Vertical Shaft Alignment 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, Vertical Shaft Alignment or O3 ONField?

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

### Do Vertical Shaft Alignment or O3 ONField have ads?

Neither Vertical Shaft Alignment nor O3 ONField shows ads.

### Which is updated more often, Vertical Shaft Alignment or O3 ONField?

Vertical Shaft Alignment ships an update every 6 months, and O3 ONField fortnightly. Most recently, Vertical Shaft Alignment was updated on November 3, 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.*