@Fire yes that's the one. It is international yes and is probably aimed more at gathering the range of wild plants. But once I used it for work purposes I got to like it. The machine learning thing behind the apps i guess is pretty standard but the apps works nicely.
I'm very happy with PictureThis. I do pay for it (I think about £20 per year) and it seems to get most things right (not everything of course, but it does provides stock pictures of whatever response it gives - which helps give some confidence). If you're still not sure it's easy to double check with a google image search of the response.
I agree having an app can be a lot more convenient than posting on a forum - sometimes at a nursery, public gardens etc you just want an instant answer.
I use Google lens as it's integrated into the camera app on my phone. Sometimes it's wrong but it is usually OK. Maybe not for specific varieties though.
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I agree having an app can be a lot more convenient than posting on a forum - sometimes at a nursery, public gardens etc you just want an instant answer.