Comparison

EDDMapS vs The CHAD

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Document invasive species distribution
  • User-friendly mapping system
  • Data submission and querying
  • Interactive maps
  • Expert data verification
  • Early Detection and Rapid Response support
Features
Read full description

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.

About

The CHAD

A secure field mapping tool designed for mapping invasive species activities. Access is restricted to authorized personnel from participating organizations.

Highlights
  • Secure field mapping
  • Invasive species activity tracking
  • On-the-go mapping
  • Restricted access
  • Wildlife monitoring
Features
Read full description

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

EDDMapS4 screens
The CHAD4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

EDDMapS ships an update monthly, The CHAD every 4 weeks. The most recent releases landed on September 25, 2026 and September 19, 2026 respectively.

Scorecard3 real differences · 7 level
EDDMapS versus The CHAD: the parameters behind the verdict, then further details
ParameterEDDMapSThe CHAD
PriceFreeFree
Rating4.7 (120 ratings)5.0 (1 ratings) — better
Positive reviews57.1% of reviews—
Number of ratings120 — better1
Update frequencyMonthlyEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.616.6 — better
Further details — not scored
Size251 MB41 MB
Age rating4+4+
DeveloperCharles T. BargeronMotivf

Customer experience

EDDMapS

All ratings120 ratings
Positive92.5%
Neutral3.3%
Negative4.2%
Written reviews14 reviews
Positive57.1%
Neutral7.1%
Negative35.7%

The CHAD

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

EDDMapS

No in-app purchases

None

The CHAD

No in-app purchases

Questions

Is EDDMapS free?
EDDMapS is free to download, with no in-app purchases.
Is The CHAD free?
The CHAD is free to download, with no in-app purchases.
Which has better reviews, EDDMapS or The CHAD?
The CHAD is rated higher. EDDMapS averages 4.7 out of 5 from 120 ratings, while The CHAD averages 5.0 from 1 ratings.
Do EDDMapS or The CHAD have ads?
Neither EDDMapS nor The CHAD shows ads.
Which is updated more often, EDDMapS or The CHAD?
EDDMapS ships an update monthly, and The CHAD every 4 weeks. Most recently, EDDMapS was updated on September 25, 2026 and The CHAD on September 19, 2026.

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