It has entries that range from the charismatic spotted wood owl to the striking crimson sunbird.
This version also features 140 bird calls and songs to help with the identification of birds in the field.
Retiree and birder Alan OwYong came up with the idea for the app in 2011. He then worked with fellow birder Lim Kim Keang to put it together.
Mr OwYong, 71, who is a committee member of the Bird Group, says: "I wanted to use technology to reach out to the younger generation of birders.
"Having an app is also more convenient and saves users from having to buy a book on birds and carrying it around while birdwatching.
"They just need a mobile phone to access the basic information. If they want more details, they can then turn to the books."
Another app, SGBioAtlas, helps users to identify birds and other animal species.
Launched by the National Parks Board in 2015, the app provides a way for the public to report sightings of interesting animals by uploading photos tagged with the location of the sightings.
The app has been downloaded almost 8,000 times.
Such apps have made it easier for young birders, such as junior college student See Wei An, 17, to identify the feathered creatures during excursions.
He says: "When I started out, I would have to observe the bird, guess what species it was and flip to the right page in a book of birds to see if I was right."
But since using the Birds Of Singapore app in March, he has been turning to the book less often.
"With the app, I can apply filters such as 'shorebird' or 'nightbird' to narrow my search and this makes it much easier and faster to know what type of bird I am looking at."
Birds of many feathers