# MPD Simulator vs Petroleum Dictionary

The clearest difference is price: Petroleum Dictionary at Free against MPD Simulator's $49.99. MPD Simulator's advantage is in-app purchases (none vs 5) and ads (none vs shown). On device support there is nothing between them.

Petroleum Dictionary is free to download; MPD Simulator costs $49.99 up front. Petroleum Dictionary sells 5 in-app purchases, starting at $1.99 per 7 days. MPD Simulator asks for nothing beyond the download.

MPD Simulator ships an update every 4 months, Petroleum Dictionary every 9 months. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | MPD Simulator | Petroleum Dictionary |
| --- | --- | --- |
| Price | $49.99 | **Free** |
| Rating | — | **[4.4 (9 ratings)](https://appshunter.io/ios/app/petroleum-dictionary-offline/id1487805808/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 13 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) |

## What reviewers say

### MPD Simulator

[App page](https://appshunter.io/ios/app/mpd-simulator/id1109781805)

**Features:** Vision Pro support

**In-app purchases:** none


### Petroleum Dictionary

[App page](https://appshunter.io/ios/app/petroleum-dictionary-offline/id1487805808)

This app provides a comprehensive offline dictionary for petroleum engineering terms, including definitions, equations, formulas, and quizzes. It offers features like speech-to-text, text-to-speech, and the ability to save favorites and view search history. It's designed for students and professionals in the oil and gas industry.

**Highlights:** Offline access to over 5000 petroleum terms, Includes engineering equations and formulas, Interactive quizzes to test knowledge, Speech-to-text and text-to-speech functionality, Save favorite terms and view search history, Easy-to-use interface

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro Plan | $1.99 | per 7 days |
| Monthly Pro Plan | $4.99 | per month |
| Yearly Pro Plan | $29.99 | per year |
| Remove Ads | $9.99 | one-time |
| Lifetime Access | $39.99 | one-time |


## Frequently asked questions

### Is MPD Simulator free?

MPD Simulator costs $49.99, with no in-app purchases.

### Is Petroleum Dictionary free?

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

### Do MPD Simulator or Petroleum Dictionary have ads?

Petroleum Dictionary shows ads; MPD Simulator does not.

### Which is updated more often, MPD Simulator or Petroleum Dictionary?

MPD Simulator ships an update every 4 months, and Petroleum Dictionary every 9 months. Most recently, MPD Simulator was updated on October 2, 2026 and Petroleum Dictionary on September 30, 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.*