I need a GDPR-compliant Lead Capture Forms Provider

I need to capture emails on my site https://found.dev for people who want to join in.

Right now, I am doing it with Outseta, since they have a function called "Lead Capture Forms" which is very easy to integrate.

Unfortunately, this provider is not GDPR compliant. They don't have some basic functions like a checkbox for confirming that the user read the privacy terms.

I am searching for something that is is cheap (or even with a free tier), easy to integrate and GDPR compliant.

I don't need a landing page provider, I need just a popup that I can integrate in my site where the user can insert the email, nothing else.

Do you know any?