Generate custom embed forms for your Substack publication.
No coding required. Just style, copy & paste.
Yes, Formstack is completely free. You can generate as many forms as you like for your Substack publication.
No. We take privacy seriously. Emails are passed directly to Substack via our proxy server. We do not store, log, or sell any subscriber data.
Yes! The generated code is standard HTML and JavaScript. It works on WordPress, Webflow, Carrd, Ghost, and any other platform that allows custom code embeds.
The default Substack embed is an iframe, which is hard to style and often loads slowly. Formstack gives you a lightweight, native form that you can fully customize to match your brand's colors and style.