Back when I was making the Difre images, I explored another way of using image differences, by combining two images straight from the camera, instead of just using one as in the Difre images. I never finished the web page to do that, but recently I returned to it.
The first step was to clean up the web page, to eliminate missteps and make it more functional. As I was trying out the new version, I realized that it wouldn’t take much to add the ability to get the standard double exposure effect instead, so I added that. Here are a couple examples. The black and white one is the standard double exposure and the color one is the “different” one.
There are more examples here: Two Different galleries. And if you want to make your own, you can: Two Different web page. All the processing is done on your phone/computer, no ads, no tracking, just fun!