OCD Zoom

I wrote this app to scratch a personal itch. I was visiting the Prado Museum in Madrid, taking photos of the wonderful paintings there. And they kept coming out crooked. It was frustrating, so I designed a computer vision algorithm that could detect paintings and straighten them. Turns out it works with powerpoint slides and book covers too. Anyway, I find it useful, so I'd like to get some feedback: * Is it a product you'd use? * Does it need extra features? * Is it reliable with all environments / phone models? * Are there use-cases I haven't thought of? There's a demo video on the website. It's Android-only at the moment, but I'll do an iOS version if there's enough interest.