# Addon Skills vs uCertifyPrep PMI PgMP

The clearest difference is in-app purchases: Addon Skills at none against uCertifyPrep PMI PgMP's 1. Addon Skills also leads on update cadence (every 6 days vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. uCertifyPrep PMI PgMP sells 1 one-off in-app purchase. Addon Skills asks for nothing beyond the download.

Addon Skills ships an update every 6 days, uCertifyPrep PMI PgMP every 4 months. The most recent releases landed on September 12, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Addon Skills | uCertifyPrep PMI PgMP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 4 months |
| Size | 25 MB | 121 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Addon Skills Private Limited](https://appshunter.io/developer/1590540657) | [uCertify LLC](https://appshunter.io/developer/1130631061) |

## What reviewers say

### Addon Skills

[App page](https://appshunter.io/ios/app/addon-skills/id1590540655)

**Features:** macOS Compatibility

**In-app purchases:** none


### uCertifyPrep PMI PgMP

[App page](https://appshunter.io/ios/app/ucertifyprep-pmi-pgmp/id1611730357)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| uCertifyPrep PMI PgMP | $49.99 | one-time |


## Frequently asked questions

### Is Addon Skills free?

Addon Skills is free to download, with no in-app purchases.

### Is uCertifyPrep PMI PgMP free?

uCertifyPrep PMI PgMP is free to download, with in-app purchases available.

### Do Addon Skills or uCertifyPrep PMI PgMP have ads?

Neither Addon Skills nor uCertifyPrep PMI PgMP shows ads.

### Which is updated more often, Addon Skills or uCertifyPrep PMI PgMP?

Addon Skills ships an update every 6 days, and uCertifyPrep PMI PgMP every 4 months. Most recently, Addon Skills was updated on September 12, 2026 and uCertifyPrep PMI PgMP on June 4, 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.*