# EDDMapS Biocontrol vs Rockd

The clearest difference is ratings volume: Rockd at 187 against EDDMapS Biocontrol's 3. EDDMapS Biocontrol's advantage is rating (4.7 vs 4.4). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

EDDMapS Biocontrol holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Rockd has 187 ratings behind it against 3, so its average is the more settled of the two.

EDDMapS Biocontrol ships an update every 4 months, Rockd every 3 months. The most recent releases landed on October 23, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | EDDMapS Biocontrol | Rockd |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/eddmaps-biocontrol/id717210517/reviews)** | [4.4 (187 ratings)](https://appshunter.io/ios/app/rockd/id1153056624/reviews) |
| Number of ratings | 3 | **187** |
| Positive reviews | — | 73.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 26 MB | 259 MB |
| Requires iOS | 16.6 | 16.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Charles T. Bargeron](https://appshunter.io/developer/381326173) | [University of Wisconsin-Madison Shared Apps](https://appshunter.io/developer/908478605) |

## What reviewers say

### EDDMapS Biocontrol

[App page](https://appshunter.io/ios/app/eddmaps-biocontrol/id717210517)

This app serves as a reference and reporting tool for invasive plants and their biological control agents. It connects to EDDMapS to assist agencies in tracking the release and occurrence of biological control agents for noxious weeds.

**Highlights:** Invasive plant reference, Biological control agent reporting, Noxious weed tracking, Agency data integration, Occurrence tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is EDDMapS Biocontrol free?

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

### Is Rockd free?

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

### Which has better reviews, EDDMapS Biocontrol or Rockd?

EDDMapS Biocontrol is rated higher. EDDMapS Biocontrol averages 4.7 out of 5 from 3 ratings, while Rockd averages 4.4 from 187 ratings.

### Do EDDMapS Biocontrol or Rockd have ads?

Neither EDDMapS Biocontrol nor Rockd shows ads.

### Which is updated more often, EDDMapS Biocontrol or Rockd?

EDDMapS Biocontrol ships an update every 4 months, and Rockd every 3 months. Most recently, EDDMapS Biocontrol was updated on October 23, 2026 and Rockd on November 2, 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.*