# Pax Validation vs 737 CSFF

The clearest difference is price: Pax Validation at Free against 737 CSFF's $2.99. Pax Validation also leads on iOS requirement (13.6 vs 17.6). On rating, ratings volume, update cadence and ads there is nothing between them.

Pax Validation is free to download; 737 CSFF costs $2.99 up front. 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 Pax Validation against 5.0 for 737 CSFF. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

Pax Validation ships an update every 2 months, 737 CSFF every 4 months. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Pax Validation | 737 CSFF |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/pax-validation/id1530082345/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/737-csff/id1551516212/reviews) |
| Number of ratings | **3** | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | **Free** | Paid |
| Size | 30 MB | 11 MB |
| Requires iOS | **13.6** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [SITA Information Networking Computing USA Inc](https://appshunter.io/developer/1530082347) | [Dan O'Leary](https://appshunter.io/developer/1177083778) |

## What reviewers say

### Pax Validation

[App page](https://appshunter.io/ios/app/pax-validation/id1530082345)

This app streamlines passenger processing at airports, enhancing safety and security. It offers automated, touchless validation at various checkpoints throughout the passenger journey.

**Highlights:** Automated passenger validation, Touchless processing, Enhanced safety and security, Improved passenger experience, End-to-end journey coverage

**Features:** macOS Compatibility

**In-app purchases:** none


### 737 CSFF

[App page](https://appshunter.io/ios/app/737-csff/id1551516212)

A visual guide to understanding Cold Soaked Fuel Frost (CSFF) on 737 aircraft wings. It references airline handbooks and Boeing FCOM guidance for educational purposes.

**Highlights:** Visual representation of CSFF scenarios, Study guide for 737 wing frost, References North American Airline Flight Handbook, Includes Boeing FCOM guidance, Educational tool for pilots

**In-app purchases:** none


## Frequently asked questions

### Is Pax Validation free?

Pax Validation is free to download, with no in-app purchases.

### Is 737 CSFF free?

737 CSFF costs $2.99, with no in-app purchases.

### Which has better reviews, Pax Validation or 737 CSFF?

Pax Validation and 737 CSFF are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do Pax Validation or 737 CSFF have ads?

Neither Pax Validation nor 737 CSFF shows ads.

### Which is updated more often, Pax Validation or 737 CSFF?

Pax Validation ships an update every 2 months, and 737 CSFF every 4 months. Most recently, Pax Validation was updated on October 20, 2026 and 737 CSFF on October 7, 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.*