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how to use “Cap (Proof-of-Work)” captcha? (found in Form plugin settings)

Solved by Andy Miller View solution

Started by Anna 5 days ago · 3 replies · 91 views
5 days ago

I just discovered this new Captcha option in the Form plugin settings – however, it does not seem to appear in the form fields reference. How do I use it? And am I right in assuming it’s basically the same as ALTCHA, which I have been working on a plugin for? 😆

last edited 06/30/26 by Anna
5 days ago

Thanks for mentioning this new captcha option in the Form plugin. Quite a nice move to decrease spam by increasing the $ costs for spammers and decrease their revenues.

Have started playing with it...

No, it has no documentation yet, but it's fairly easy to implement. No such things as requiring keys from Google or others.

And am I right in assuming it’s basically the same as ALTCHA,

Here is a brief comparison between cap and altcha: https://trycap.dev/guide/alternatives

5 days ago Solution

Yes, i added Cap support in Form plugin recently for various reasons, mostly because there was no good proof-of-work option for PHP/Grav that didn't involve a 3rd party service, and also because the other local caption options Form has are easily circumvented by spam bots nowadays.

More information here: https://getgrav.org/blog/grav-form-captcha-options

4 days ago

Perfection. Just what I was looking for when I started building the ALTCHA plugin. Well that’ll teach me to stay on top of the Grav blog…! 😆

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