# Learn PostgreSQL Offline vs PDE Data Engineer Exam Prep

The clearest difference is price: PDE Data Engineer Exam Prep at Free against Learn PostgreSQL Offline's $1.99. PDE Data Engineer Exam Prep also leads on update cadence (every 3 months vs every 41 months). Learn PostgreSQL Offline's advantage is iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

PDE Data Engineer Exam Prep is free to download; Learn PostgreSQL Offline costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Learn PostgreSQL Offline ships an update every 41 months, PDE Data Engineer Exam Prep every 3 months. The most recent releases landed on September 28, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Learn PostgreSQL Offline | PDE Data Engineer Exam Prep |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 3 months** |
| Size | 39 MB | 27 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Muhammad Mubeen](https://appshunter.io/developer/1553722821) | [Davy Raitt](https://appshunter.io/developer/1795318281) |

## What reviewers say

### Learn PostgreSQL Offline

[App page](https://appshunter.io/ios/app/learn-postgresql-offline/id1624444188)

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

**In-app purchases:** none


### PDE Data Engineer Exam Prep

[App page](https://appshunter.io/ios/app/pde-data-engineer-exam-prep/id6757119609)

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

**In-app purchases:** none


## Frequently asked questions

### Is Learn PostgreSQL Offline free?

Learn PostgreSQL Offline costs $1.99, with no in-app purchases.

### Is PDE Data Engineer Exam Prep free?

PDE Data Engineer Exam Prep is free to download, with no in-app purchases.

### Do Learn PostgreSQL Offline or PDE Data Engineer Exam Prep have ads?

Neither Learn PostgreSQL Offline nor PDE Data Engineer Exam Prep shows ads.

### Which is updated more often, Learn PostgreSQL Offline or PDE Data Engineer Exam Prep?

Learn PostgreSQL Offline ships an update every 41 months, and PDE Data Engineer Exam Prep every 3 months. Most recently, Learn PostgreSQL Offline was updated on September 28, 2026 and PDE Data Engineer Exam Prep on September 24, 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.*