I only used the free version of this app and though it was good but not great. Like all free apps i have used it has some advertisements. One thing I think needs worked on is being able to play the calls without internet connection. Everything else works without it except that. Also with the free version there are a lot of limits to what you can and cant do but after all that is why it is the free version. I think it could be a decent buy for anybody that is into birding.
Noblemigration about Bird Songs - Bird Call & Guide