You can Find All type of forms demo that is AMP Compatible as shown

1. Contact Form 7 for AMP Demo.

[contact-form-7 id=”150″ title=”Contact form 1″]

2. Email Opt-in Form for AMP Demo.

[contact-form-7 id=”150″ title=”Contact form 1″]

3. Gravity Form For AMP Demo.

[gravityform id=”1″ title=”false” description=”false”]

4. Ninja Form for AMP Demo.

[ninja_form id=2]

5. WP Form for AMP Demo.

[wpforms id=”186″ title=”false” description=”false”]