HeyForm

Drag-and-drop form builder, conversational (one question at a time) layout, conditional logic, integrations with webhooks and Zapier.

AGPL v3, TypeScript. The UI is polished for an open source project; it looks like a Typeform competitor, not a developer tool pretending to be user-friendly. Supports file uploads, payment collection (Stripe), and 40+ field types. Self-hosting is free. Docker Compose gets you running in minutes. The AGPL license means if you modify the code, you need to open-source your changes, important for SaaS companies that might want to embed it.

HeyForm also offers a hosted version. Free tier with limited submissions. Paid plans start around $19/mo for more submissions and custom domains. Solo: self-host for free or use the hosted free tier. Small teams: self-host to avoid per-seat costs, or pay $19/mo for zero ops. Medium: self-host makes sense at scale: unlimited forms and submissions.

The catch: the integration ecosystem is thin compared to Typeform. If you need native CRM integrations, email marketing connections, or advanced analytics, Typeform's paid tier has more. HeyForm handles webhooks well, so you can build integrations yourself, but that's developer time.