ArcNote is an app that's difficult to describe in a few, short words. So, let me have some visuals do the talking. Look at the screenshots below, and you'll probably pretty quickly understand what this app does.

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Now that you've looked at them, you probably realize this is kind-of-sort-of amazing. If you're constantly in meetings, or attend some kind of higher education institution, you probably see a lot of PowerPoint / Keynote slides. This app lets you take a picture of a slide presentation while also simultaneously recording audio, and those pictures can then be transformed / tweaked into properly-oriented, full-sized slides.

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I tried it with my computer monitor at a fairly awkward angle, and it worked scarily well. I think the video (below) is a little optimistic about the distances you'll be able to achieve usable results at, but even so, this app is unlike anything else I've ever seen, and it solves a real-world problem I definitely had when I was in college. Head to the Play Store link below to give it a shot.