Replace / Mendix
Best free Mendix alternatives (open source, self-hosted) 2026
The best open-source alternative to Mendix is Baserow (or Appsmith) with ToolJet, self-hosted on Railway. Airtable replacement: a real database with a spreadsheet UI, plus internal tools on top — including a Smartsheet-shaped grid and a Bubble / Glide / Softr / Adalo / AppSheet off-ramp.
Estimated save $2,400 a year.
Open the stackStart on Railway
How Mendix compares
| Mendix | Baserow + Appsmith | |
|---|---|---|
| Pricing model | Hosted subscription | Open-source or fair-code license; you pay the host |
| Hosting | Vendor cloud | Self-hosted on Railway or any VPS |
| Rough monthly cost | Public list price not verified this run | Hosting only — no SaaS seat meter in this repo |
FAQ
- What is the best free open-source Mendix alternative?
- The best open-source alternative to Mendix is Baserow (or Appsmith) with ToolJet, self-hosted on Railway. Airtable replacement: a real database with a spreadsheet UI, plus internal tools on top — including a Smartsheet-shaped grid and a Bubble / Glide / Softr / Adalo / AppSheet off-ramp.
- Is it free?
- The Baserow + Appsmith licenses are open source or fair-code. You still pay hosting (Railway or any VPS) and any APIs the stack calls. There is no Mendix seat or task bill on this path.
- Can I migrate from Mendix?
- Yes. Start with the workflows or data you actually use, then cut over. The Baserow + Appsmith stack page has the agent prompt and the cost table; most teams rebuild the slice that matters and leave old Mendix links until they expire.
- How do I deploy it?
- Open the Baserow + Appsmith stack, copy the agent prompt, and deploy on Railway (one service, PORT, and a volume when the app needs disk). Placeholder: Baserow + Appsmith + Postgres. Medium complexity; second-wave template.
- What does this replace?
- Airtable / Retool / Smartsheet / Bubble / Glide / Softr / Adalo / AppSheet / OutSystems / Mendix. The published small-team estimate on this stack is $2,400 a year.
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