1. Sometimes it's accurate, sometimes ridiculously inaccurate.I wasn't troubled by the ads- mercifully! However, the most accurate description I could get, was to tell me the stones I tested, were igneous, sedimentry or metamorphic.
2. Don't download it:(Terrible app! Multiple different (obviously wrong) identifications of the same stone - same angle, same distance from lens.
3. Kept telling me that us was stone that was made up of glass that was made by lightning hitting the sand.
4. If you have a friend that likes rocks, they can guess as good as this app does.
5. Uninstalled it.Not a good rock identification app.
6. If you really want to have a rock analyzed, it's not free through this app.
7. Wouldn't even identified Greenstone from New Zealand.
8. All this app does is let you take a pic, then give you a few if of its guesses with descriptions.
9. If I didn't have to give it a star I wouldn't.
10. Not much is given for free here.
11. Then it said in the next scan it was sandstone.