Just found this neat app from Bosch, it use your phone to analyze both sound level and vibration, gives you a history graph and you can even record them. The vibration measurement isn’t particularly sensitive but I don’t know if it’s because of my phone or the app itself.
If it reads decibel it’s not gonna be much accurate. I have a app like that also it’s simular but you don’t get the actual reading.but then there is a level app and it does work. I wouldn’t use it on something crazy but it’s accurate
Probably more useful for relative measurement than absolute value. I recall the microphone used on phones are optimized for human voice frequency/loudness. It looks like this app let you adjust compensation for individual frequency ranges, but I don’t know how would one do that without an actual sound meter to compare with.
The vibration meter is more interesting, haven’t seen an app does that before, could come in handy for fine tuning (stationary) power tools.