DD4WH

You might consider using Kaleidoscope full version by WildlifeAcoustics, it has Classification of NA bats built in. Not cheap, however. I do not know about open source classifiers for North America, but there might be ....

No need for ultrasound playback to test a detector! Just use a key Ring, 🔑 it produces very loud ultrasound. But of course Edwin is correct: in order to playback ultrasonic wavs, you need considerable effort. But in the northern hemisphere, at...

Yes, as far as I remember, it's available for several OS, including MacOS. There is also our website, although in German, that might guide people in ID of bat calls...

Try Kaleidoscope LITE, it's much faster than Audacity. Also free, you just have to register. Also try BatClassify, a nice open source classifier for Central European bats. This is the most accurate ID books for Central European bats...