It actually works! I mean it's impossible to get an accurate results, but it gives you a general idea of where the studs are based on the small spikes in the magnetic reading from the nails. It works enough to make the job easier. This is from a Samsung S3 mini so I imagine most new phones will give as good if not a better reading. The trick is to make sure you are not wearing or near anything which will give off a magnetic reading and then move the phone slowly over the wall, looking for small, regular spikes in the reading.
Cool idea but... Since it uses the phone mag censor, the app relies on the hardware. I have an app that looks at raw hardware data. I see how it would work but on my Samsung s4, not so well. Still not sure how wood studs can effect a mag sensor. They are non ferrous. You might pick up on a screw. I bet metal studs would work great.
Better than Nothing While not technically a "stud" finder per say, it does work by using a metal detector (upper left on S4) to find the nails in the studs, which is a little trickier, but it works in the end.
Not really working on Samsung galaxy s4. Found most probable sensor location to be top left. No beep even when beep its enabled. Suppose it works, just not as I would expect it. I get a higher reading with metal placed near sensor, but no audible confirmation.
Awesome App Don't know if it's been mentioned before: Make sure you are not wearing a watch and/or wedding band or the like. Took me about 4 minutes to realize: Why phone kept vibrating while following steps on Youtube video. Doh!
Unsuccessful It worked against metal, but it only went off one time searching my entire wall. Going up and down around that area, nothing else went off. Hard to believe there is only one nail in that wall. Might work for others. I have a Samsung Edge, purchased June 2016.
v1.03: change vibrating pattern
v1.02: fix issue in tablet
v1.01: bug fix
v0.91: update user feedback form
v0.9: add seek bar, add default ref
v0.8: various improvements, add ad
v0.65: Add back requirements for gps and Wifi location. v0.6 removes those requirements by using geocoder service. However, geocoder service does not work well. Also modify location service and help.
v0.6: Drop requirements for gps and Wifi location. Add user feedback form. Help information improvement.