# DrillAR vs Petroleum Dictionary

The clearest difference is in-app purchases: DrillAR at none against Petroleum Dictionary's 5. DrillAR also leads on ads (none vs shown) and update cadence (every 4 months vs every 9 months). Petroleum Dictionary's advantage is rating (4.4 vs 4.0) and ratings volume (9 vs 1). 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. DrillAR asks for nothing beyond the download.

Petroleum Dictionary holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Petroleum Dictionary has 9 ratings behind it against 1, so its average is the more settled of the two.

DrillAR ships an update every 4 months, Petroleum Dictionary every 9 months. The most recent releases landed on October 7, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | DrillAR | Petroleum Dictionary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/drillar/id820710413/reviews) | **[4.4 (9 ratings)](https://appshunter.io/ios/app/petroleum-dictionary-offline/id1487805808/reviews)** |
| Number of ratings | 1 | **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** | Free with in-app purchases |
| Size | 780 MB | 13 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Schlumberger Technology Corporation](https://appshunter.io/developer/380098290) | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) |

## What reviewers say

### DrillAR

[App page](https://appshunter.io/ios/app/drillar/id820710413)

Explore a life-sized, 3D Schlumberger integrated drilling system. Examine intricate components of bottom-hole assemblies and gain insight into the latest well-drilling technologies used globally.

**Highlights:** Life-sized 3D drilling system model, Examine BHA components, Insight into drilling technologies, Featured drilling components: Drill Bits, Drive Systems, LWD, Hole opening

**Features:** macOS Compatibility

**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 DrillAR free?

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

### Is Petroleum Dictionary free?

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

### Which has better reviews, DrillAR or Petroleum Dictionary?

Petroleum Dictionary is rated higher. DrillAR averages 4.0 out of 5 from 1 ratings, while Petroleum Dictionary averages 4.4 from 9 ratings.

### Do DrillAR or Petroleum Dictionary have ads?

Petroleum Dictionary shows ads; DrillAR does not.

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

DrillAR ships an update every 4 months, and Petroleum Dictionary every 9 months. Most recently, DrillAR was updated on October 7, 2026 and Petroleum Dictionary on October 26, 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.*