open source form builder

When looking for an open-source form builder, the right choice depends heavily on your stack, whether you want a self-hosted full application, or if you just need a library to embed into your own code.

Here are the top open-source form builders available today, categorized by how they are best used:

Full-Featured & Self-Hosted Platforms

These are complete, standalone alternatives to proprietary tools like Typeform or Google Forms.

Formbricks

• Best for: Privacy-focused user research and in-app surveys.

• Key Features: It integrates directly into web apps to trigger surveys based on user behavior, but also supports standard shareable link forms. It features a modern UX and strong analytics.

Form.io

• Best for: Complex enterprise applications and data management.

• Key Features: It is a combined form builder and API platform. When you build a form, it automatically generates the backend database schema and REST APIs to support it.

OhMyForm

• Best for: A lightweight, community-driven Typeform alternative.

• Key Features: Focuses on creating conversational, one-question-at-a-time forms. It is fully open-source and easy to deploy via Docker.

Developer Libraries & SDKs

If you are building a web application and need a drag-and-drop form builder component to embed for your users, these are the industry standards.

SurveyJS

• Best for: Highly customizable enterprise surveys and forms.

• Key Features: It offers a powerful form builder UI component that you can embed in React, Angular, Vue, or jQuery applications. The form definitions are stored as clean JSON.

Formik / React Hook Form (with visual builders)

• Best for: Code-first developers who want full UI control.

• Key Features: While these are technically code libraries for managing form state, they are frequently paired with open-source drag-and-drop UI builders (like Formily) to create custom internal tools.

Low-Code & Internal Tool Ecosystems

Sometimes you need forms that trigger complex workflows, database writes, or internal approvals.

Appsmith / Budibase

• Best for: Internal business tools and CRUD applications.

• Key Features: While they are full low-code platforms rather than just form builders, their drag-and-drop form creation interfaces are incredibly robust. They easily connect forms directly to PostgreSQL, MongoDB, or external APIs.