I made a proof-of-concept for a browser-based Fap Gauntlet, but it's local only (you have to select images/videos from your hard drive, they aren't sent anywhere; also, the number of strokes and speed is randomized). I couldn't make it work as-is with 4chan posts because, even though the browser can fetch the JSON API just fine, the images themselves won't load (CORS headers aren't set up on
i.4cdn.org). It's still a work in progress, and I plan on writing some self-hostable simple proxy to use the 4chan API, but if you'd like to use your own collection, enjoy.
https://wwwew.neocities.org/gauntlet/https://gitgud.io/valvavil/fap-gauntlet-web-edition (you can download the repo, and then open index.html in your browser)
by the way
35, slow, reverse grip
