Rock ID app?

[Blackfoot58]

I’ve got an app on my phone that IDs trees, plants, etc. It works most of the time with good accuracy. I’ve been looking for a FREE one that does rocks. What I’ve found: Free (for 2 IDs, then $19.00), FREE (trial period, then $19.99).
I realize developers deserve to get paid. I have no issue with a few ads. Anyone know of such an app? I won’t use it much and don’t want to give my cc number out to buy something that I don’t really need.

 

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