Self-hosted alternatives to Retool
Internal tools are billed per user, so the admin panel nobody sees costs the same as customer-facing software.
Below are 10 open-source projects that cover the same ground, each scored 0–100 on how actively it is actually maintained — commit volume, release cadence and recent trend. 10 of the 10 are currently rated healthy or better. Ordering reflects that score, not sponsorship.
| Project | Health | Activity (11 mo) | Stars | Licence | Last release |
|---|---|---|---|---|---|
| Dify.ai Build, test and deploy LLM applications. | Thriving · 96 | 157k | Apache-2.0 | 10 Sept 2026 | |
| Appwrite End to end backend server for web, native, and mobile developers 🚀. | Thriving · 96 | 57k | BSD-3-Clause | 23 Sept 2026 | |
| Budibase Build and automate internal tools, admin panels, dashboards, CRUD apps, and more, in minutes (alternative to O | Thriving · 95 | 28k | ⊘ Proprietary | 21 Sept 2026 | |
| NocoDB No-code platform that turns any database into a smart spreadsheet (alternative to Airtable and Smartsheet). | Thriving · 92 | 65k | SUL-1.0 | 10 Sept 2026 | |
| ToolJet Low-code framework to build & deploy internal tools with minimal engineering effort (alternative to Retool and | Thriving · 90 | 41k | GPL-3.0 | 25 Sept 2026 | |
| Directus An Instant App & API for your SQL Database. Directus wraps your new or existing SQL database with a realtime G | Thriving · 85 | 38k | BUSL-1.1 | 23 Sept 2026 | |
| Halo A powerful and easy-to-use website building tool (documentation in Chinese). | Thriving · 83 | 40k | GPL-3.0 | 24 Sept 2026 | |
| TrailBase Open, sub-millisecond, single-executable FireBase alternative with type-safe REST & realtime APIs, built-in JS | Thriving · 83 | 5.6k | OSL-3.0 | 23 Sept 2026 | |
| Manifest Complete backend that fits into 1 YAML file. | Thriving · 82 | 7.5k | MIT | 27 Sept 2026 | |
| Appsmith Build admin panels, CRUD apps and workflows. Build everything you need, 10x faster. | Healthy · 81 | 41k | Apache-2.0 | 24 Sept 2026 |
How these were picked
Every project listed here is open source and can run entirely on hardware you control. We start from the categories that match Retool's job — Software Development - Low Code, Database Management — then rank by health score so that a popular-but-abandoned project never appears above a smaller one that is actively shipping. The scoring method is documented in full.
The scores are recomputed from repository data on every rebuild, so this page reflects the state of these projects as of 1 Oct 2026 — not the day it was written.
Dify.ai
Build, test and deploy LLM applications.
Best fit: Development teams and engineers looking for a low-code interface to rapidly prototype and deploy LLM-backed workflows without writing custom orchestration layers from scratch.
Worth knowing: The software carries a dual Apache-2.0 and Commons-Clause licence, which restricts commercial redistribution and hosted service offerings. As with many LLM orchestration platforms, operational resource requirements can scale quickly depending on the underlying model and concurrency.
Appwrite
End to end backend server for web, native, and mobile developers 🚀.
Best fit: Developers looking to consolidate common backend services into a single self-hosted stack rather than piecing together multiple disparate tools.
Worth knowing: Self-hosting a comprehensive backend server introduces significant operational overhead for maintenance, security updates, and scaling.
Budibase
Build and automate internal tools, admin panels, dashboards, CRUD apps, and more, in minutes (alternative to Outsystems, Retool, Mendix, Appian).
Best fit: Teams looking to speed up the creation of internal business software and admin dashboards without writing every line of code from scratch.
Worth knowing: The software uses a proprietary licence rather than open-source terms, which may impose restrictions on commercial use or enterprise deployment depending on your organisational policies.
NocoDB
No-code platform that turns any database into a smart spreadsheet (alternative to Airtable and Smartsheet).
Best fit: It suits technical teams or administrators who want to give non-technical users a familiar spreadsheet interface to interact with an underlying database without writing custom front-ends.
Worth knowing: The software is distributed under the SUL-1.0 licence, which may impose certain restrictions on commercial redistribution or hosting as a managed service compared to permissive open-source licences.
ToolJet
Low-code framework to build & deploy internal tools with minimal engineering effort (alternative to Retool and Mendix).
Best fit: Engineering teams looking to rapidly assemble internal dashboards, admin panels, and operational workflows without building custom frontends from scratch.
Worth knowing: Adopting a GPL-3.0 licensed platform may introduce compliance constraints for certain commercial deployments, and low-code solutions often present challenges when tracking complex application state and debugging underlying generated code.