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Start with almost any good-quality sound recording app -- it does not need to be bioacoustics related, any good "sound recorder". There are many apps, and the best choice keeps changing, so ...

I just download Birdnet on an Android phone and it gives you running spectrogram of the sound the possibility to get birds be classified (over net?) store data Could not figure out, how to store ...

I can share this outreach poster, which offers several apps for Android and iOS that we found worked pretty well for simple recording, viewing spectrograms, and saving sound snippets. Caveat: This is ...

This isn't really an answer to the main question, but as people mentioned in other answers the BirdNET app does appear to have aspirations of collecting acoustic "point counts" by having ...

First I would add a 5th microphone, so that the maths are simpler. (edit: what are the minimum number of micro/hydro-phones needed to perform 3d tracking?) I would measure (as precise as you can; e.g. ...

I worked on a project for several years where we used smartphones as autonomous recording devices. This work doesn't address the citizen science component of your project, but there may be some useful ...

Sounds like a neat system, all the best!! To localise sounds, you need the time-difference-of-arrivals across channels. If your direct path is the strongest, then normally simple cross-correlations ...

Wildlife Acoustics has the Echo Meter Touch, which allows you to record and visualize bat clicks in real-time on your phone or tablet. I've seen it in action and it's pretty cool, if limited in its ...

To address one of your side questions re: precise localization using a microphone dangling from a tree. You can take efforts to minimize movement of this microphone. If suspended by a rope, you can ...

Your question could be improved by being more specific about the goals of your "amateur citizen-science" project. For beginner bioacousticians, I strongly recommend focusing first on signal ...

Definitely not an existing app solution, but maybe halfway there. I played around with the Python-Android interface package 'Kivy' and can only recommend it. Kivy allows you to write a custom app ...