Stamp Identifier

I had this app for 10 minutes before deleting it. The first stamp I took a photo of using the app’s auto-focus feature was immediately identified, and the information it showed was detailed and helpful. However, when I went to identify the second stamp, the auto-focus would not work. As suggested by the app, I used two or three different white backgrounds, but after a few minutes I had no success. I attempted to use the manual search option, but none of the stamps suggested were nowhere close to what my stamp looks like. This app has solid potential, but as it stands in its current form I would not recommend it to anyone. (Since the review option won’t let me choose a rating for whatever reason, I give this app 2/5 stars).

I’ve used the app several times in the past (before ads) but, recently, I can’t get my camera to focus on a stamp at all. I’m using an iPhone 14 Pro. The only way that I’ve had any success is to take a photo of the stamp before using the app, then bring the photo into the app. Also, would there be any possibility of narrowing down the search to a particular country? I collect primarily Germany and related areas and the search frequently returns stamps from a variety of countries and, often, in the wrong orientation (portrait vs. landscape).