# PORTSIDE FOS vs Diagnostics Direct

The clearest difference is update cadence: Diagnostics Direct at every 2 months against PORTSIDE FOS's every 4 months. On price, review sentiment, 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.

PORTSIDE FOS ships an update every 4 months, Diagnostics Direct every 2 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | PORTSIDE FOS | Diagnostics Direct |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.2 (49 ratings)](https://appshunter.io/ios/app/portside-fos/id1049458379/reviews)** | — |
| Number of ratings | **49** | — |
| Positive reviews | **2.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 269 MB | 60 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Portside, Inc.](https://appshunter.io/developer/1609132004) | [Veryon](https://appshunter.io/developer/544008976) |

## What reviewers say

### PORTSIDE FOS

[App page](https://appshunter.io/ios/app/portside-fos/id1049458379)

This app provides aviation professionals with essential flight planning and scheduling tools on their mobile devices. Access aircraft schedules, crew duty times, flight logs, and trip details, with offline capabilities for use in flight. It integrates with desktop companion applications and international trip support services.

**Highlights:** Aircraft Schedules, Trip and Leg Details, Crew Duty Times, Flight Log Entry, Expense Submission, Offline Airport Directory, Weather and NOTAMs

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

**In-app purchases:** none


### Diagnostics Direct

[App page](https://appshunter.io/ios/app/diagnostics-direct/id6450266259)

This app provides aircraft technicians with a mobile solution for troubleshooting fault messages. It offers quick symptom searches and guided workflows to access top solutions, with a database updated based on field feedback.

**Highlights:** Fault isolation solution, Troubleshoot fault messages, Quick symptom search, Intuitive workflows, Dynamic database, Field experience feedback

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

**In-app purchases:** none


## Frequently asked questions

### Is PORTSIDE FOS free?

PORTSIDE FOS is free to download, with no in-app purchases.

### Is Diagnostics Direct free?

Diagnostics Direct is free to download, with no in-app purchases.

### Do PORTSIDE FOS or Diagnostics Direct have ads?

Neither PORTSIDE FOS nor Diagnostics Direct shows ads.

### Which is updated more often, PORTSIDE FOS or Diagnostics Direct?

PORTSIDE FOS ships an update every 4 months, and Diagnostics Direct every 2 months. Most recently, PORTSIDE FOS was updated on November 6, 2026 and Diagnostics Direct on November 3, 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.*