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Open-source alternatives to Bubble

Bubble is a no-code web application builder that lets users design interfaces visually and define application logic through a point-and-click workflow editor, without writing code. It hosts applications on Bubble's infrastructure and handles database storage, user authentication, and API connections natively. It targets non-technical founders and product teams building internal tools or SaaS products without engineering resources.

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The alternatives

appsmith

★ 39,745 TypeScript Apache-2.0

Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

appsmithorg/appsmith Updated 2026-05-05

ToolJet

★ 37,869 JavaScript AGPL-3.0

ToolJet is the open-source foundation of ToolJet AI - the enterprise app generation platform for building internal tools, dashboard, business applications, workflows and AI agents 🚀

ToolJet/ToolJet Updated 2026-05-06

budibase

★ 27,890 TypeScript NOASSERTION

AI agents, automations and apps that run your operations. Model agnostic.

budibase/budibase Updated 2026-05-05

Comparison notes

AppSmith and Tooljet are the closest OSS alternatives for building internal tools with a visual builder. Budibase covers similar ground with a self-hosted option for forms, CRUD apps, and dashboards. The main gaps vs. Bubble: Bubble allows building externally-facing SaaS products with complex business logic; OSS visual builders are primarily oriented toward internal tools and data management UIs. Bubble's responsive design engine and its plugin marketplace have no OSS equivalent at comparable breadth. The lock-in risk with Bubble is high — applications cannot be exported as standard code.

Migration tips

  • Bubble has no code export — migration requires rebuilding in the target platform, not converting
  • Export your Bubble database data via the built-in CSV or API export before migration
  • Document your Bubble workflows as a functional specification before rebuilding — screenshot or PDF each workflow page
  • Identify Bubble plugins you depend on and find equivalent integrations or libraries in your target platform
  • Plan for a parallel run period where both Bubble and the new application serve users while you validate feature parity

FAQ

Can I fully replace Bubble with an OSS tool?

Feature parity varies. Most OSS alternatives cover 70-90% of core workflows, but may lack polish, integrations, or specialized features. Pilot the alternative with a subset of your team before fully committing.

What's the cost of self-hosting?

Plan for ~$5-50/month in VPS costs (DigitalOcean, Hetzner, etc.) plus 2-8 hours/month in maintenance. For a team of 20+, self-hosting usually breaks even against SaaS pricing within 6-12 months.

Which alternative should I pick?

Sort by GitHub stars (a proxy for community health), check the last-pushed date (avoid unmaintained projects), and read recent issues to gauge responsiveness.