# MasterDex vs HackUDC OS

The clearest difference is in-app purchases: HackUDC OS at none against MasterDex's 2. HackUDC OS also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. MasterDex sells 2 one-off in-app purchases. HackUDC OS asks for nothing beyond the download.

MasterDex ships an update every 3 weeks, HackUDC OS every 2 weeks. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | MasterDex | HackUDC OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.7K ratings)](https://appshunter.io/ios/app/masterdex-complete-guide/id1621464261/reviews)** | — |
| Number of ratings | **1.7K** | — |
| Positive reviews | 86.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 196 MB | 48 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lorenzo Greco](https://appshunter.io/developer/480768196) | [GPUL](https://appshunter.io/developer/1874751084) |

## What reviewers say

### MasterDex

[App page](https://appshunter.io/ios/app/masterdex-complete-guide/id1621464261)

This app serves as a comprehensive guide for fans and trainers, offering detailed information on creatures, team building, and the trading card game. It features offline access, advanced search, and tracking for favorite creatures and shinies, updated for the latest generation.

**Highlights:** Updated creature information, Team builder tool, Trading Card Game details, Offline functionality, Shiny creature tracker, Advanced search filters

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Masteredex - Sale | $1.99 | one-time |
| Masterdex PRO | $2.99 | one-time |

**What reviewers like**

- 🚀 Fantastic app
- 👍 Great Pokédex
- 🔒 No ads
- 💡 One-time purchase
- 👍 Aesthetically pleasing

**What reviewers complain about**

- 🐛 Crashing and slow loading
- 🐛 Bugs with team builder
- 🐛 Missing Pokémon forms and gender differences
- 🐛 Incorrect or outdated information
- 💡 Lack of Pokémon location filters

**Reported bugs**

- Shiny toggle not working in team builder
- Pokémon 3D models and artwork not displaying
- Johto region locations missing
- Crashes when adding Pokémon to teams
- Incorrect information for some Pokémon (e.g., Necrozma's ability, Pikachu's classification)

**Requested features**

- Add Pokémon location filters
- Implement ability to mark Pokémon as caught/seen
- Add damage calculator
- Allow reorganizing of teams
- Include Pokémon cries and Dynamax/Gigantamax forms


### HackUDC OS

[App page](https://appshunter.io/ios/app/hackudc-os/id6790912214)

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

**In-app purchases:** none


## Frequently asked questions

### Is MasterDex free?

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

### Is HackUDC OS free?

HackUDC OS is free to download, with no in-app purchases.

### Do MasterDex or HackUDC OS have ads?

MasterDex shows ads; HackUDC OS does not.

### Which is updated more often, MasterDex or HackUDC OS?

MasterDex ships an update every 3 weeks, and HackUDC OS every 2 weeks. Most recently, MasterDex was updated on October 11, 2026 and HackUDC OS on October 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.*