6 Best Open Source Alternatives to FlutterFlow

6 open source alternatives100% OSI-approved licensesUpdated June 2026

Looking to replace FlutterFlow? These open source alternatives give you the same core workflow without the lock-in - free to use, often self-hostable, and auditable on GitHub. Compare licenses, languages and project activity, then switch on your own terms.

Appsmith logo

1.Appsmith

40kApache-2.0TypeScript Self-host
Appsmith screenshot

Appsmith is an open-source low-code application platform for building custom applications like dashboards, admin panels, customer 360, IT automation, and service management tools. It is built to streamline custom application development, deployment, and maintenance for teams that need internal software.

  • Build dashboards, admin panels, and internal tools
  • Connect to 25+ databases and any API
  • Create customer 360, IT automation, and service tools
  • Appsmith Agents for AI-driven automations
ToolJet logo

2.ToolJet

38kAGPL-3.0JavaScript Self-host
ToolJet screenshot

ToolJet is an open-source platform for building and deploying internal tools, workflows, and AI agents. It is aimed at teams that need internal apps, dashboards, and business applications without starting from scratch.

  • 60+ responsive components for building apps
  • Built-in no-code database
  • Connects to databases, APIs, SaaS apps, and object storage
  • Run JavaScript and Python inside apps
Budibase logo

3.Budibase

28kOtherTypeScript Self-host
Budibase screenshot

Budibase is an open-source operations platform for building agents, apps, and automations that run internal business processes. It is aimed at handling requests, approvals, issues, and workflow work without stitching together multiple tools.

  • Build agents that handle requests, approvals, and issues
  • Create records, route approvals, update apps, and notify teams
  • Connect databases, AI models, and business apps
  • Public API for backend use and interoperability
Lowdefy logo

4.Lowdefy

3kApache-2.0JavaScript Self-host
Lowdefy screenshot

Lowdefy is a config-first web stack for building full-stack web apps with YAML. It is built for apps that AI can generate, humans can review, and teams can maintain, with schema-validated config instead of arbitrary code paths.

  • YAML config for full-stack web apps
  • 70+ UI components including forms, tables, and charts
  • 50+ logic operators for dynamic UIs
  • 10+ data connectors including MongoDB and PostgreSQL
Saltcorn logo

5.Saltcorn

2kMITJavaScript Self-host
Saltcorn screenshot

Saltcorn is an open source no-code database application builder for building web and mobile database applications without writing code. It is meant for people who want to model data and create apps without assembling a custom stack from scratch.

  • Build web and mobile database applications without code
  • Flexible views, datatypes, layouts, and actions
  • Self-host an instance or run multitenant
  • Built on PostgreSQL and node.js
Lowcoder logo

6.Lowcoder

1.6kAGPL-3.0HTML Self-host
Lowcoder screenshot

Lowcoder is an open-source low-code platform for building internal tools, customer-facing apps, websites, dashboards, and meeting or collaboration tools. It helps teams design interfaces, connect data, and share apps with colleagues or customers without relying on a proprietary low-code platform.

  • Visual UI builder with 120+ built-in components
  • Modules and query library for reusable UI and data queries
  • Native website embedding without iframes
  • Data connections for SQL, MongoDB, Redis, REST API, SMTP, and WebSocket

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