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Open source alternatives to Fillout[005]

Fillout is a form and survey builder with conditional logic, payments, and integrations that push responses into other business tools. Below are 5 self-hostable open source alternatives, ranked by GitHub popularity.

// EDITOR'S TAKE

HeyForm is the closest match to Fillout's multi-step, conversational builder and is straightforward to self-host. Formbricks is the stronger choice when your forms are in-product surveys that need targeting and response analytics, while LimeSurvey is a heavier research tool with question types and logic the others cannot approach.

// FREQUENTLY ASKED

What is the best open source Fillout alternative?

Formbricks is the most popular open source Fillout alternative by GitHub stars (12,190 stars). The other 4 options are ranked above.

Are these Fillout alternatives self-hostable?

Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.

Are they free?

All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.