open source web form builder

If you are looking to host your own forms, maintain total data privacy, or avoid subscription limits, several open-source web form builders stand out.

Here are the top open-source web form builders available, categorized by use case and feature set.

Modern & Conversational (Typeform Alternatives)

Formbricks

• Overview: A privacy-first, developer-friendly experience management platform and direct open-source alternative to Typeform.

• Best For: Product feedback, website/in-app pop-up micro-surveys, and embeddable web forms.

• Key Features: Advanced conditional logic, multi-language support, link & target page pop-up triggers, webhooks, and native Slack/HubSpot integrations.

• License: AGPL-3.0.

HeyForm

• Overview: A sleek, drag-and-drop conversational form builder designed for small businesses, creators, and product teams.

• Best For: Lead capture, event registration, and customer satisfaction surveys.

• Key Features: Interactive card-style inputs, custom themes, field validation, and Zapier integration.

• License: AGPL-3.0.

Typebot

• Overview: A visual, chat-like form builder that transforms forms into conversational chatbots.

• Best For: High-converting lead generation flows, interactive onboarding, and automated FAQ collection.

• Key Features: Flow-chart builder, native integration with OpenAI/LLMs, custom code snippets, and real-time response tracking.

• License: AGPL-3.0.

Minimalist & No-Code Web Forms

OpnForm

• Overview: A fast, minimalist no-code form builder built with Laravel and Vue.

• Best For: Quick static web forms, simple contact pages, and fast data capture without bloat.

• Key Features: Unlimited forms and submissions, URL prefilling, file uploads, captcha protection, and Discord/Slack webhooks.

• License: AGPL-3.0 (with dual-licensed Enterprise options).

Developer-First & Enterprise Platforms

SurveyJS

• Overview: A collection of JavaScript libraries (React, Angular, Vue, Vanilla JS) that lets developers render and store forms directly within their own tech stack.

• Best For: Embedding a full drag-and-drop form builder inside your own SaaS product or portal.

• Key Features: Outputs pure JSON schemas, framework-agnostic engine, full CSS theme editor, and local response data storage.

• License: MIT (Form Library) / Commercial or Dual-licensed (Builder UI).

Form.io

• Overview: An enterprise platform that generates both the front-end HTML forms and the backend REST API endpoints simultaneously from JSON.

• Best For: Complex enterprise intake systems, government filings, and healthcare applications requiring custom API pipelines.

• Key Features: Automatic REST API generation, complex nested forms, PDF overlays, and role-based permissions.

• License: Open-source core with commercial enterprise extensions.

Deep Academic & Market Research

LimeSurvey

• Overview: The battle-tested workhorse of open-source survey tools, active since 2003.

• Best For: Academic research, statistical surveys, and massive multi-page questionnaires.

• Key Features: Deep quota management, assessment rules, advanced expression script logic, and multi-language matrix questions.

• License: GPLv2.

Summary Recommendations

If you want a modern, polished Typeform alternative: Start with Formbricks or HeyForm.

If you want to build forms inside your existing web app: Go with SurveyJS.

• If you need a chat-based flow: Choose Typebot.

If you need simple self-hosted forms set up in minutes: Try OpnForm.