Comparison

HerpMapper vs Project Monarch Science

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

Head to head
About

HerpMapper

Record reptile and amphibian observations with photos, sounds, and GPS locations. Your data supports scientific research and conservation efforts globally. Access your findings online and contribute to a shared database.

Highlights
  • Record observations with photos and sound
  • Automatic GPS location tagging
  • Offline recording capability
  • Searchable herpetofauna database
  • Data contribution to research and conservation
  • View records on the HerpMapper website
Features
Read full description

HerpMapper is a 501(c)(3) nonprofit organization designed to gather and share information about reptile and amphibian observations across the planet. Using the HerpMapper mobile app, you can create records of your herp observations and keep them all in one place. In turn, your data is made available to HerpMapper Partners – groups who use your recorded observations for research, conservation, and preservation purposes. Your observations can make valuable contributions on the behalf of amphibians and reptiles. Using your phone’s camera and GPS capabilities, the HerpMapper mobile app creates a ‘voucher record’ of your find, incorporating photos of the animal, and recording the location. For calling frogs and toads, the app enables you to record and include a sound file in a record. The date and time of day are also recorded. The app features a searchable database of the common and scientific names for all of the world’s herpetofauna, and you can search for either type of name by entering just a fragment. The newest version of the app allows you to add multiple photos and soundfiles to a record The HerpMapper mobile app does not require wireless or cellular service in order to properly record locations - it uses your phone’s native GPS device, which remains in satellite contact when outside (many HerpMapper records have been recorded in remote corners of the globe). Once you are back in wireless or cellular range, you can upload (sync) your collected records to the HerpMapper database. Once uploaded, you can view any and all of your records from the HerpMapper website (www.herpmapper.org). Creating a HerpMapper account is fast, simple, and free, and you can use the site and the mobile app to keep track of your finds, build a life list, and contribute to science and herp conservation! Instructions for creating an account, and installing and using the mobile app, are listed on the HerpMapper website. Who can see the records you create? There are two levels of visibility for records. Only you and HerpMapper Partners have access to all of the data in the records you create. Other users of HerpMapper and the general public can only see very basic information in your records – they do not have access to exact locality data. Any pictures attached to a record have their locality metadata stripped, so they can be seen by everyone on the HerpMapper website, which means you can also see the cool herps being recorded by other people from around the world. Who are HerpMapper's Partners? For the most part, they are biologists working for state or regional agencies, university researchers, or conservation organizations across the globe. A list of HerpMapper Partners is maintained on the HerpMapper website.

About

Project Monarch Science

This app transforms your smartphone into a receiver for tiny tracking devices attached to monarch butterflies. By crowdsourcing data, it helps scientists monitor butterfly migration patterns in unprecedented detail, aiding conservation efforts.

Highlights
  • Crowdsourced tracking network
  • Monarch butterfly migration monitoring
  • Detailed movement data
  • Habitat conservation insights
  • Utilizes Bluetooth frequency
  • Citizen science participation
Features
Read full description

Project Monarch is an effort to leverage recent advances in tracking technology, that have enabled the development of the world’s smallest tracking devices, to track Monarch migration. The tracking devices on the monarch butterflies transmit at the same frequency as Bluetooth which means that everyone with a smartphone is carrying around a receiver in their pocket! This revolutionary approach can potentially create the largest wildlife tracking receiver network in the world, but only if members of the public download and use the free Project Monarch app. These data will allow scientists to track the movements of monarch butterflies in detail never previously imagined. We will see how monarchs utilize key stopping points along migratory routes and learn more about the speed and direction of migration, helping identify the most important sites for habitat conservation and restoration. Ultimately, this technology can help guide conservation planning and lead to increases in monarch populations.

Screenshots

HerpMapper4 screens
Project Monarch Science4 screens

Verdict

The call

The clearest difference is update cadence: Project Monarch Science at weekly against HerpMapper's every 3 months. Project Monarch Science also leads on rating (3.7 vs 3.5). On price, review sentiment, ratings volume and ads 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

Project Monarch Science holds the better App Store score, 3.7 against 3.5. Both are backed by a comparable volume of ratings — 24 and 18 respectively. Written reviews point the same way: 42% of HerpMapper's written reviews are positive against 45% of Project Monarch Science's.

UpkeepUpdate frequency

HerpMapper ships an update every 3 months, Project Monarch Science weekly. The most recent releases landed on June 1, 2026 and September 21, 2026 respectively.

Scorecard2 real differences · 8 level
HerpMapper versus Project Monarch Science: the parameters behind the verdict, then further details
ParameterHerpMapperProject Monarch Science
PriceFreeFree
Rating3.5 (24 ratings)3.7 (18 ratings) — better
Positive reviews41.7% of reviews45.5% of reviews — better
Number of ratings24 — better18
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size67 MB83 MB
Age rating4+4+
DeveloperDonald BeckerCellular Tracking Technologies

Customer experience

HerpMapper

All ratings24 ratings
Positive58.3%
Neutral8.3%
Negative33.3%
Written reviews12 reviews
Positive41.7%
Neutral8.3%
Negative50.0%

Project Monarch Science

All ratings18 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews11 reviews
Positive45.5%
Neutral0.0%
Negative54.5%

In-app purchases

None

HerpMapper

No in-app purchases

None

Project Monarch Science

No in-app purchases

Questions

Is HerpMapper free?
HerpMapper is free to download, with no in-app purchases.
Is Project Monarch Science free?
Project Monarch Science is free to download, with no in-app purchases.
Which has better reviews, HerpMapper or Project Monarch Science?
Project Monarch Science is rated higher. HerpMapper averages 3.5 out of 5 from 24 ratings, while Project Monarch Science averages 3.7 from 18 ratings.
Do HerpMapper or Project Monarch Science have ads?
Neither HerpMapper nor Project Monarch Science shows ads.
Which is updated more often, HerpMapper or Project Monarch Science?
HerpMapper ships an update every 3 months, and Project Monarch Science weekly. Most recently, HerpMapper was updated on June 1, 2026 and Project Monarch Science on September 21, 2026.

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