I run into https://www.hcaptcha.com/ and https://friendlycaptcha.com/ from time to time as a user without complaint. Can't speak to the latter but I've used the former a bit and it does the job.
replyAny chance for something 100% self-hostable? hcaptcha and friendlycaptcha last I checked require interfacing with their services.
replyCloudflare Turnstile, if you're already using Cloudflare (or not!): https://www.cloudflare.com/application-services/products/tur...
replyAnubis is an alternative to captchas, it's OSS.
replyhcaptcha is pretty popular these days. It uses a very wide variety of traditional visual puzzles.
replyin my good ol' days I just sent a screenshot to 2captcha for grid of the entire captcha iframe which means that the solvers would have to figure out what to do instead of having to write code for each different type of captcha. to solve their new rotating puzzles I would just capture them at 50% opacity twice and change the prompt to pick the highest brightness object since 50% opacity would dim the moving elements.
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