Learning bird calls

Hi everyone,
I’ve never been very good at identifying birds by calls, but now I find I’m losing my eyesight, so I’m hoping to try and continue my interest in birds by learning their calls. Is there a reliable app or other resource to get more familiar with calls?
I have the Pizzey and Knight app, and the Morcombe app, which I think are really useful, but I have to identify the bird first before I can play the call. What I want to do is identify the bird by call only.
Any advice gratefully received. My eyesight will be gone within the year so want to start my new learning journey as soon as I can.
Thanks,
Tracey

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