If you're looking for a form backend service that lets you add custom forms to your static website without having to write server-side code, Formspree is a good choice. Formspree lets you add custom HTML and JavaScript forms to static sites and offers features like spam protection, customizable email notifications and third-party integrations. It also offers a variety of ways to create forms, including a CLI and React library, so it's easy to use and secure.
Another good option is Sheet Monkey, which integrates with Google Sheets, Webflow, WordPress and other services so you can quickly set up form submissions without any backend programming. It offers features like email notifications, automatic redirects, file uploads and a drag-and-drop form builder. Sheet Monkey is good for landing pages, email capture and storing user data, and has flexible pricing plans for different needs.
If you want a more advanced form building experience, Tripetto could be a good fit. It's a bit of a mashup of SurveyMonkey, Typeform and Landbot, letting you build smart forms with features like Magnetic Storyboards and Conversational Logic. Tripetto's pricing is flexible, with a cloud-based Studio plan and a WordPress Plugin, so it's good for anyone who wants to build conversational forms.
You might also consider OpnForm, which has a range of features and templates for all skill levels. It includes a free core plan with unlimited forms and submissions and AI-powered form generation. The Pro Plan adds features like form confirmation emails, custom domain integration and priority support, so it's a good choice for contact, registration and online order forms.