Best open-source Low-code app builders

Ranked picks

1. 1

   Appsmith

   Apache-2.0 internal tools — the c17 OutSystems / Mendix / Retool path. /compare/appsmith-vs-tooljet.

   When to pick it: Admin screens on a database you already have.

2. 2

   Budibase

   GPLv3 overall low-code apps. packages/pro is BSL — skip it. /compare/budibase-vs-appsmith.

   When to pick it: Ops apps if Appsmith is not the shape.

   28,331 stars in the catalog

3. 3

   Tooljet

   AGPL-3.0 internal apps already on /replace/retool. /compare/appsmith-vs-tooljet.

   When to pick it: The other Retool-shaped builder.

4. 4

   Baserow

   Open-source Airtable-shaped grid already on /replace/airtable. /compare/teable-vs-baserow.

   When to pick it: A spreadsheet UI, not an OutSystems factory.

How they compare

Related pages

• Baserow + Appsmith stack
• Grist stack
• bolt.diy stack
• Replace Airtable
• Replace Retool
• Replace Smartsheet
• Replace Bubble
• Replace Glide
• Replace Softr
• Replace Adalo
• Replace AppSheet
• Replace OutSystems
• Replace Mendix
• Replace Google Sheets
• Replace Lovable
• Replace Bolt.new
• Replace v0
• All best open-source pages
• All compare pages
• All replace pages
• All stacks
• Tools catalog

FAQ

Appsmith or Budibase?

Appsmith if you want the published OutSystems / Mendix admin path. Budibase if you want that GPLv3 box — /compare/budibase-vs-appsmith.

OutSystems or Mendix?

Same published low-code desk — /replace/outsystems and /replace/mendix.

Is this Bubble?

A hosted no-code app stays on /replace/bubble-io and /best/no-code-app-builders. This page is the enterprise low-code off-ramp.

Are these free?

Appsmith is Apache-2.0. Budibase overall is GPLv3; skip BSL pro. ToolJet is AGPL-3.0. You pay hosting. Template users never pay c17.

How do I deploy it?

Open /stacks/baserow-appsmith. Postgres behind the grid. One Appsmith screen on top.