# PORTSIDE FOS vs ColdTempCorr

The clearest difference is in-app purchases: PORTSIDE FOS at none against ColdTempCorr's 2. PORTSIDE FOS also leads on iOS requirement (15.6 vs 18.6). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. ColdTempCorr sells 2 in-app purchases, starting at $2.99 per 3 months. PORTSIDE FOS asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | PORTSIDE FOS | ColdTempCorr |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.2 (48 ratings)](https://appshunter.io/ios/app/portside-fos/id1049458379/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | **2.9% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 269 MB | 4 MB |
| Requires iOS | **15.6** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Portside, Inc.](https://appshunter.io/developer/1609132004) | [AeroKitPro LLC](https://appshunter.io/developer/1049063068) |

## 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


### ColdTempCorr

[App page](https://appshunter.io/ios/app/coldtempcorr/id1639003124)

This professional aviation tool helps pilots calculate necessary cold temperature corrections for flight operations. It ensures compliance with aviation regulations by providing accurate altitude adjustments in cold weather, enhancing safety and efficiency.

**Highlights:** Cold temperature correction calculations, ICAO PANS-OPS and FAA TERPS compliance, Advanced atmospheric calculations, Constant Descent Final Approach planning, Air data conversions

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Months subscription | $2.99 | per 3 months |
| One year subscription | $9.99 | per year |


## Frequently asked questions

### Is PORTSIDE FOS free?

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

### Is ColdTempCorr free?

ColdTempCorr is free to download, with in-app purchases available.

### Do PORTSIDE FOS or ColdTempCorr have ads?

Neither PORTSIDE FOS nor ColdTempCorr shows ads.

### Which is updated more often, PORTSIDE FOS or ColdTempCorr?

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