# PML Engineer Exam Prep vs Certification Preparation

The clearest difference is in-app purchases: PML Engineer Exam Prep at none against Certification Preparation's 2. PML Engineer Exam Prep also leads on ads (none vs shown). Certification Preparation's advantage is update cadence (every 3 weeks vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Certification Preparation sells 2 one-off in-app purchases. PML Engineer Exam Prep asks for nothing beyond the download.

PML Engineer Exam Prep ships an update every 3 months, Certification Preparation every 3 weeks. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | PML Engineer Exam Prep | Certification Preparation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 27 MB | 42 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Davy Raitt](https://appshunter.io/developer/1795318281) | [Manish Salunke](https://appshunter.io/developer/1896583910) |

## What reviewers say

### PML Engineer Exam Prep

[App page](https://appshunter.io/ios/app/pml-engineer-exam-prep/id6757166329)

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

**In-app purchases:** none


### Certification Preparation

[App page](https://appshunter.io/ios/app/certification-preparation/id6776616024)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Limited Time Offer | $9.99 | one-time |
| Course Unlock | $19.99 | one-time |


## Frequently asked questions

### Is PML Engineer Exam Prep free?

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

### Is Certification Preparation free?

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

### Do PML Engineer Exam Prep or Certification Preparation have ads?

Certification Preparation shows ads; PML Engineer Exam Prep does not.

### Which is updated more often, PML Engineer Exam Prep or Certification Preparation?

PML Engineer Exam Prep ships an update every 3 months, and Certification Preparation every 3 weeks. Most recently, PML Engineer Exam Prep was updated on October 31, 2026 and Certification Preparation on November 5, 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.*