I set myself a goal of seeing and identifying 100 UK bird species this year, partly because CET Junior has become interested in wildlife photography and with a static caravan in Selsey (surrounded by Pagham and Medmerry RSPB reserves) it gave a bit of purpose to the enjoyment. Now spending nearly all of my time in Basingstoke suburbs, realised that lots of bird species are brown and fly into bushes at the first sign of human presence, making it difficult to identify, except through song.
I found the RSPB website really helpful, but only if I knew the species, which is difficult when the little warbler/sparrow/something blur that was caught in a split second of motion disappears without trace.
So a birdsong app that can guess the species of a bird from a call would be great. Warblr seemed to be the market leader, but I then happened on BirdNET which is free and from my initial experiments in our garden, reasonable accurate (it not only gives a possible identification but also a probability). It gives a sound trace from 1kHz to 12kHz showing what sounds were recorded so if there are multiple birds singing at the same time you can select the part of the trace in which your bird is singing - a magpie's cackle is 3Khz, a sparrows piping is 9Khz.
Sharing this but also interested in others' experiences.