# Petroleum Dictionary vs PetroMaster

The clearest difference is in-app purchases: PetroMaster at none against Petroleum Dictionary's 5. PetroMaster also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 9 months). On price and device support there is nothing between them.

Both are free to download. Petroleum Dictionary sells 5 in-app purchases, starting at $1.99 per 7 days. PetroMaster asks for nothing beyond the download.

Petroleum Dictionary ships an update every 9 months, PetroMaster every 2 weeks. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Petroleum Dictionary | PetroMaster |
| --- | --- | --- |
| Price | Free | 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 | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 13 MB | 41 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) | [ALP Turnkey Solutions PVT LTD](https://appshunter.io/developer/1785115911) |

## What reviewers say

### 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 |


### PetroMaster

[App page](https://appshunter.io/ios/app/petromaster/id6764496792)

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

**In-app purchases:** none


## Frequently asked questions

### Is Petroleum Dictionary free?

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

### Is PetroMaster free?

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

### Do Petroleum Dictionary or PetroMaster have ads?

Petroleum Dictionary shows ads; PetroMaster does not.

### Which is updated more often, Petroleum Dictionary or PetroMaster?

Petroleum Dictionary ships an update every 9 months, and PetroMaster every 2 weeks. Most recently, Petroleum Dictionary was updated on November 3, 2026 and PetroMaster on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*