EDDMapS vs The CHAD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EDDMapS
Document and map the distribution of invasive species with this user-friendly system. It allows for easy data submission, visualization, and querying, aiding in early detection and rapid response efforts. All data is reviewed by experts for accuracy.
- Document invasive species distribution
- User-friendly mapping system
- Data submission and querying
- Interactive maps
- Expert data verification
- Early Detection and Rapid Response support
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EDDMapS is a mapping system for documenting invasive species distribution. It is fast, easy to use, and doesn't require Geographic Information Systems experience. Launched in 2005 by the Center for Invasive Species and Ecosystem Health at the University of Georgia, it was originally designed as a tool for state Exotic Pest Plant Councils to develop more complete distribution data of invasive species. EDDMapS goal is to maximize the effectiveness and accessibility of the immense numbers of invasive species observations recorded each year. Why do we care? An invasive species is when a nonnative species causes or is likely to cause economic, environmental harm, or harm to human health. Invasive species negatively impact agriculture, recreation, natural ecosystems, biodiversity, and more. The first step is prevention of nonnative introduction. The second step is to map where the invasive species are found in the introduced area. How does it work? EDDMapS is a platform to document, display, and query the presence of invasive species. A simple, interactive Web interface engages participants to submit their observations or view results through interactive queries into the EDDMapS database. EDDMapS encourages users to participate by providing Internet tools that maintain their personal records and enable them to visualize data with interactive maps. Users simply enter information from their observations into the standardized reporting form, which allows specific information about the infestation and images to be added. Uploaded data entered is immediately loaded to the database for verification. Once data is reviewed as correct by an expert, it is available for viewing and download. Being able to see the current data of a species as it moves into a new area helps to facilitate Early Detection and Rapid Response programs (EDRR). EDRR programs help stop or control an invasive species before it becomes an unmanageable problem. All data is reviewed by expert verifiers to ensure all data is accurate prior to public availability. The data is freely available to everyone including scientists, researchers, land managers, land owners, educators, conservationists, ecologists, farmers, foresters, state, and national parks.
The CHAD
A secure field mapping tool designed for mapping invasive species activities. Access is restricted to authorized personnel from participating organizations.
- Secure field mapping
- Invasive species activity tracking
- On-the-go mapping
- Restricted access
- Wildlife monitoring
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The CHAD is a secure field mapping tool to map the invasive species activities on the go. Access is restricted to personnel from participating organizations.
Screenshots
Verdict
The clearest difference is ratings volume: EDDMapS at 120 against The CHAD's 1. The CHAD's advantage is rating (5.0 vs 4.7) and iOS requirement (16.6 vs 18.6). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
The CHAD holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: EDDMapS has 120 ratings behind it against 1, so its average is the more settled of the two.
EDDMapS ships an update monthly, The CHAD every 4 weeks. The most recent releases landed on September 25, 2026 and September 19, 2026 respectively.
| Parameter | EDDMapS | The CHAD |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (120 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 57.1% of reviews | — |
| Number of ratings | 120 — better | 1 |
| Update frequency | Monthly | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.6 | 16.6 — better |
| Further details — not scored | ||
| Size | 251 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Charles T. Bargeron | Motivf |
Customer experience
EDDMapS
The CHAD
In-app purchases
EDDMapS
No in-app purchases
The CHAD
No in-app purchases









