Discern is a swipe game that tests whether you can spot AI-generated photos. See a photo, swipe left for AI or right for real. An Elo system rates both you and the images so the game gets harder as you improve, while easier images find their way to newer players. The image library grows itself around the clock from real photo sources and multiple AI generators at different quality levels. No sign-up, no ads, no tracking. Free to play, open source.