# Rockd vs Petroleum Engineering+

The clearest difference is rating: Petroleum Engineering+ at 5.0 against Rockd's 4.4. Petroleum Engineering+ also leads on update cadence (monthly vs every 3 months). Rockd's advantage is in-app purchases (none vs 6) and ratings volume (185 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Petroleum Engineering+ sells 6 in-app purchases, starting at $9.99 per month. Rockd asks for nothing beyond the download.

Petroleum Engineering+ holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Rockd has 185 ratings behind it against 1, so its average is the more settled of the two.

Rockd ships an update every 3 months, Petroleum Engineering+ monthly. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Rockd | Petroleum Engineering+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (185 ratings)](https://appshunter.io/ios/app/rockd/id1153056624/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/petroleum-engineering-plus/id6746214573/reviews)** |
| Number of ratings | **185** | 1 |
| Positive reviews | 73.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 259 MB | 18 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [University of Wisconsin-Madison Shared Apps](https://appshunter.io/developer/908478605) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### Rockd

[App page](https://appshunter.io/ios/app/rockd/id1153056624)

Discover and document the geology around you. Access global geologic maps, 3D globes, and detailed summaries of your surroundings. Contribute your own observations and track your exploration of Earth's geologic history.

**Highlights:** Interactive global geologic maps, 3D virtual globe exploration, Field observation logging, Offline map caching, Paleogeographic map access, Stratigraphic column viewing, Geologic literature integration

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

**In-app purchases:** none

**What reviewers like**

- 🗺️ Comprehensive geological maps with detailed information
- 💡 Innovative integration of peer-reviewed references and literature
- 🧭 Built-in Brunton compass and clinometer tools
- 📱 User-friendly interface and intuitive navigation
- 🌍 Global coverage with paleomaps and stratigraphic data

**What reviewers complain about**

- 🐛 Black map display issues in offline and online modes
- 📍 GPS tracking and real-time position updates failing
- 🔌 Offline functionality severely limited or broken
- 🔐 Persistent login requirement without password saving
- ⚠️ Error dialogs that won't dismiss

**Reported bugs**

- Black map display in airplane mode and online
- Persistent error dialogs that cannot be dismissed
- GPS not tracking in real-time
- Offline check-ins not syncing properly
- Sign-up page jumps between fields and login page

**Requested features**

- Follow/friend mechanic to track other users' check-ins
- Rock identification tool from photo uploads
- Offline map download with customizable zoom levels
- Stereonet tool for structural geology
- Groundwater/aquifer information section


### Petroleum Engineering+

[App page](https://appshunter.io/ios/app/petroleum-engineering-plus/id6746214573)

Master petroleum engineering concepts through engaging quizzes covering a wide range of topics from geology to production. Ideal for students and professionals seeking to enhance their knowledge and skills in the oil and gas industry.

**Highlights:** Comprehensive quiz coverage, Topics from geology to production, Boost knowledge and skills, Engaging learning experience, Suitable for students and professionals

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


## Frequently asked questions

### Is Rockd free?

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

### Is Petroleum Engineering+ free?

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

### Which has better reviews, Rockd or Petroleum Engineering+?

Petroleum Engineering+ is rated higher. Rockd averages 4.4 out of 5 from 185 ratings, while Petroleum Engineering+ averages 5.0 from 1 ratings.

### Do Rockd or Petroleum Engineering+ have ads?

Neither Rockd nor Petroleum Engineering+ shows ads.

### Which is updated more often, Rockd or Petroleum Engineering+?

Rockd ships an update every 3 months, and Petroleum Engineering+ monthly. Most recently, Rockd was updated on September 18, 2026 and Petroleum Engineering+ on September 23, 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.*