Coral Observer is a progressive web app designed to automate data entry and support the centralised Caribbean coral spawning database.

Use the Coral Observer app to streamline and automate your spawning data entry and join a network of scientists working together to monitor coral spawning activity around the Caribbean.

You can find out more about how coral spawn by clicking the button below
Enter your observation data
View observation data on the map
Export your data to Excel

Why participate?


By joining the app, you will become part of our online community of coral reproduction enthusiasts, and you will receive updates on Caribbean-wide spawning reports

This is a first of its kind app, designed to streamline time-sensitive data collection

Your data will contribute to a regional database, facilitating data analysis to understand patterns and trends.

This won’t take you any extra time - when you upload your data we send you a .csv file with your data in to easily add to your own local database.

If you want to view the datasets to know when spawning might occur in your area, we have a searchable database that you can access by signing up, and you can also get in touch if you have any questions.

We protect the data from improper use by evaluating full access requests on a case by case basis and a data agreement is signed on release of the data.

This app was built by passionate coral reef volunteers, The Coral Observer coral spawning app is free to use and always will be!

Who can submit data?


Anyone who has monitored coral spawning in the Caribbean! In order to register, you will need to enter your name and affiliation, whether that be an academic institute, research organisation, or dive centre. A coral spawning observation can be conducted using snorkel or scuba. We advise you to collaborate with local scientists and experts, but if you don’t have any near you please get in touch and we can put you in touch with the right people for some guidance on how and when to observe coral spawning. 


To make a spawning observation on Coral Observer, you will need to record the following data points:



  • Region / site / sub-site name. The app automatically gets your latitude and longitude (you can change it by clicking on the map or entering GPS coordinates)
  • Area details: temperature, depth, approximate area monitored (km2)

The observation:

  • Coral species observed
    (scientific name only)
  • Number of colonies monitorered
  • Setting / spawning time or absence of setting / spawning and in how many colonies

Collection details:

For trained practictioners only!
  • How many colonies did you collect from and what happened with the gametes?
  • Do you have a fertilisation / settlement / survival rate yet?

Support the cause

This Coral Observer app was developed by volunteers with the sole aim of advancing collaboration and scientific understanding of coral reef science. We hope that using this app will facilitate study and knowledge-building in the coral reef science community, including the valuable citizen scientists, volunteers and conservationists who are invaluable for coral reef research and restoration.

To find out more please follow our work at (site currently being updated).

How does the Coral Observer work?

The web app can be accessed from any device and can also be downloaded onto a smartphone. As a progressive web app, it does not require anywhere near as much space or memory on your phone as a native app, and it won’t drain your battery either. 

Where does the data go?

The data is stored in a searchable database on our secure web server Locations where spawning has been reported on our app can be viewed on this map and we release an annual report of all of the data we have received from each Caribbean coral spawning season to our registered users. You can export your own data at any time and you can request all open access data

How will the data be cited? 

If someone uses data from the database for any kind of report, publication, or dissertation, you can reference the Caribbean spawning database as…. TBC

To talk about the app in your paper you would use the citation:

The Coral Observer Application (2021) A progressive web application for ecological data collection,

Or, if you want to refer to a particular observation or set of observations (i.e., for your site of interest) you can reference a particular observer. If you wish to do this, please get in touch so we can ensure that you correctly cite the data!


Helpful resources

This platform was inspired by and designed to support the decades of research by dedicated scientists, technicians, and volunteers who have tirelessly observed coral spawning to build knowledge on the spawning times and frequency in the Caribbean. Their work has been compiled into useful calendars for estimating when to conduct your coral spawning observation. Check out the links below:

  • CORALIUM link
  • CARAMBI link

Coral Conservation society

Thanks to Coral Conservation Society for the fantastic video and infographic.
Be sure to head over to for more information and to support coral conservation