Windmill vs Budibase
Both are alternatives to Retool. Here's how they stack up — verified facts, no spin.
Also searched as Budibase vs Windmill — same comparison, one verdict.
Windmill
For teams whose internal tools are mostly scripts and workflows.
Windmill takes the opposite approach to a drag-and-drop canvas: you write scripts in Python, TypeScript, Go or Bash and Windmill generates the UI from their inputs, alongside a workflow engine for chaining them. For an engineering team whose internal tooling is fundamentally automation with a form on top — reruns, backfills, ops jobs — that is a much better fit than a widget canvas. AGPL-3.0 core with a commercial enterprise edition. Roughly 17.5k stars, and unusually fast because the execution engine is Rust.
Budibase
Brings its own database, so a tool can exist before the data does.
Budibase differs from the others in a way that matters more than it sounds: it includes an internal database, so you can build a working tool before you have a backend to point it at. That makes it the fastest option for the common case of a team that needs a form, a table and some approvals — not a dashboard over an existing production database. It also connects to external sources when you have them. GPL-3.0 core with a commercial enterprise tier, around 28k stars.
Side by side
| Windmill | Budibase | |
|---|---|---|
| Sovereignty Score | 88 | 87 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first | Yes | Yes |
| License | AGPL-3.0 (core; enterprise edition is commercial) | GPL-3.0 (core; enterprise tier is commercial) |
| Pricing | Free and open source to self-host. Paid cloud and enterprise editions. | Free and open source to self-host. Paid cloud and enterprise plans. |
Windmill edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Windmill
Strengths
- +Script-first: the UI is generated from code you already write
- +Serious workflow engine, not an afterthought
- +Rust execution engine — genuinely fast
- +Fits engineering teams better than a drag-and-drop canvas
Trade-offs
- −Wrong shape if you want non-engineers building tools
- −AGPL-3.0 strong copyleft
- −Smaller community than Appsmith or ToolJet
- −UI generation is less flexible than hand-placed widgets
Budibase
Strengths
- +Built-in database — build a tool without wiring a backend first
- +Strong automations and form handling
- +Self-hosts easily on Docker or Kubernetes
- +Good fit for approvals and internal workflows rather than dashboards
Trade-offs
- −Weaker than Appsmith or Retool for complex data applications
- −GPL-3.0 copyleft is worth reading before you modify it
- −Enterprise features behind the paid tier
- −Smaller connector library than the alternatives
Related alternative guides
Facts verified 2026-08-07. Licenses and pricing change — spotted something out of date? That's a correction we want.