Fe/male Switch: Your Startup Facilitator & Incubator for Women

Open-Source Retool Alternatives (2027): 9 Self-Hosted Internal Tool and Admin Panel Builders, Checked for Licence and Activity

Open-Source Retool Alternatives for Internal Tools, Admin Panels and Dashboards You Host Yourself

Retool is the best-known way to build internal tools: admin panels, dashboards, approval apps and CRUD screens on top of your database and APIs. But it is not open source, you pay per builder and per internal user, and self-hosting is reserved for its Enterprise plan. An open-source alternative lets you run the builder on your own server, keep your data inside your network and stop paying per seat. We checked every tool below on its official website and GitHub in October 2026: the exact licence, the latest release, what the free self-hosted edition includes and what the paid plans cost. Three projects from the earlier list are no longer maintained or are no longer open source, and you will find them in a separate section at the end.
Quick answer: for the closest open-source match to Retool, use Appsmith (Apache 2.0) or ToolJet (AGPL, with an AI app builder); for non-developers who need apps plus automations, use Budibase; for a data-model-first business system with unlimited free users, use NocoBase; for scripts and workflows that need a UI, use Windmill; and if your team writes React, build the admin panel with Refine or React-admin.
Boost Your SEO by Getting Featured in Our Blogs and get a backlink.

We publish content about startups, education, tech, funding, etc. that ranks well not only in Google but also in Perplexity, ChatGPT, Grok and other AI tools.

👉 Get featured now!

What Retool Costs in 2027

To know what you are replacing: the Retool pricing page (checked October 2026, prices shown in euros) has a free plan for up to 5 users. Team costs €9 per builder and €5 per internal user per month billed yearly, and Business €46 per builder and €14 per internal user. Self-hosting and air-gapped installs are listed only on the Enterprise plan, which is priced through sales. Every tool below can be self-hosted for free; you pay for the server and your own time instead.

Open-Source Retool Alternatives Compared

ToolBest forLicenceFree self-hosted editionPaid plans (Oct 2026)
AppsmithClosest Retool match: drag and drop plus JavaScriptApache 2.0Community Edition, no user limitBusiness $15/user/month (cloud free for 5 users)
ToolJetRetool-style builder with AI app generationAGPL-3.0Community EditionCloud from $23/builder/month; free cloud plan for 2 builders
BudibaseNon-developers: apps, automations and agentsGPLv3 overall; paid features BSLUnlimited apps and users, 1 workspaceCloud from $19/month
NocoBaseData-model-first business systems (CRM, ERP)Apache 2.0 with extra termsUnlimited users, apps and recordsOne-time licences from $800
LowcoderInternal and customer-facing apps, Openblocks successorAGPL-3.0Community EditionEnterprise from €459/instance/month
WindmillTurning scripts and workflows into appsAGPLv3 core; enterprise code proprietaryUp to 50 users, 3 workspacesEnterprise from $120/month
RefineReact developers building admin panelsMITFramework, no limitsEnterprise support on request
React-adminReact developers who want ready CRUD screensMITFramework, no limitsOptional Enterprise Edition
SaltcornNo-code database apps on a small budgetMITFull software, no limitsNone listed
Sources: each project's official website, pricing page, LICENSE file and GitHub releases, checked 27 October 2026. Self-hosting is free, but you pay for the server and your own time.

The Best Open-Source Retool Alternatives in 2027

1. Appsmith: the closest open-source match to Retool

Appsmith calls itself an open-source internal tool builder, and it works much like Retool: you drag widgets onto a canvas, connect them to a database, SaaS tool or REST and GraphQL API, and add logic in JavaScript. It can also add AI interactions to apps using your own data. The code is open source under the Apache 2.0 licence, and Appsmith says you can run any edition on your own infrastructure. In the cloud, the free plan covers up to 5 users; Business costs $15 per user per month for up to 99 users, and Enterprise starts at $2,500 a month for 100 users. Version 2.5.1 was released in October 2026, and releases come out every one to two weeks.

2. ToolJet: an open-source internal tool builder with AI app generation

ToolJet now describes itself as an AI app builder for internal tools: you describe an app in plain English, it generates screens and queries, and you refine them visually before rollout. It has more than 100 native connectors, a built-in PostgreSQL-based ToolJet Database, workflows and an agent builder. The code is AGPL-3.0, and you can self-host the free Community Edition with Docker or Kubernetes. The cloud Free plan includes 2 builders, up to 50 end users, 10 apps and 100 AI credits a month; Basic costs $23 per builder per month, and Team $199 per builder per month billed yearly. ToolJet ships long-term-support releases alongside beta builds; LTS version 3.20.251 came out in October 2026.

3. Budibase: apps, automations and AI agents for non-developers

Budibase is the friendliest option for teams without developers. It combines internal apps, data tables that connect to databases and spreadsheets, automations for approvals and notifications, and AI agents (in beta) that answer employee requests. Its licence file says Budibase is GPLv3 overall, while paid features live in a separate package under the Business Source License, and apps you build do not fall under the GPL. The self-hosted open-source plan is free with unlimited apps, users, automations and agents, plus SSO, in one workspace. Budibase Cloud starts at $19 a month for the Pro plan, with end users at $5 each. Version 3.51 was released in October 2026.

4. NocoBase: a data-model-first platform with unlimited free users

NocoBase starts from your data model rather than from screens, which suits bigger internal systems such as a CRM, an ERP or a ticketing tool. It is built from plugins and now leans on AI: AI employees, MCP and skills let coding agents build and change the system while people approve the changes. The free Community Edition has no limits on users, applications or records, but you must keep the NocoBase logo. Paid licences are one-time payments: Standard costs $800 and Professional $8,000. Read the licence carefully: it is Apache 2.0 with supplementary terms, and those terms forbid offering any public no-code, low-code or AI platform SaaS built on NocoBase. Version 2.2.34 came out in October 2026.
Validate your startup idea with the unique borrowed authority approach: we publish articles about your product in our blog and you get traffic and testers for your MVP

  • Prove Market Demand: See real organic traffic and waitlist conversions

  • Unlock High-Potential Keywords: Receive a curated list of top-performing keywords directly from Google Search Console data.

  • Estimate Customer Acquisition Cost (CAC): Gain financial foresight with an estimated CAC based on real keyword performance data.

🔗 Start validating your startup now

5. Lowcoder: the maintained successor of Openblocks

Lowcoder builds internal tools as well as apps for people outside your company: customer portals, public forms, dashboards, embeddable mini apps and even video meeting apps. Its website lists more than 120 components and more than 60 data sources. Its GitHub README says Lowcoder continues the abandoned Openblocks project, and it is AGPL-3.0. The Community Edition is free to self-host with Docker Compose or Helm, and Enterprise licences start at €459 per instance per month or €4,990 per year. Its latest release, called Renaissance, came out in October 2026.

6. Windmill: turn scripts into apps, workflows and AI agents

Windmill is code-first: you write scripts in Python, TypeScript, Go, SQL, Bash and other languages, and Windmill turns them into auto-generated UIs, APIs, scheduled jobs and workflows. Its app builder adds custom UIs on top, so it suits teams whose internal tools are really scripts with a form in front. Its licence is AGPLv3 for most of the code, with some parts under Apache 2.0 and enterprise features under a proprietary licence. The free self-hosted Community Edition has unlimited executions but a maximum of 50 users, 3 workspaces and 100 guest app users per 30 days; Enterprise starts at $120 a month. Windmill ships new versions almost daily; version 1.850.0 came out in October 2026.

7. Refine: an MIT React framework for admin panels and internal tools

Refine is not a drag-and-drop builder but a headless React meta-framework for CRUD-heavy apps: admin panels, dashboards and internal tools, with ready connections to REST, GraphQL and many backends, and your own choice of UI library. The Refine Core code is MIT-licensed, so you own everything you build. The company now also offers an AI agent and web IDE built on Refine Core that turns APIs into React internal apps. Activity has slowed: the last release of the core package was version 5.0.12 in April 2026, and the last code change in the repository was in September 2026.

8. React-admin: ready CRUD screens for React teams

React-admin from Marmelab is a long-running MIT-licensed framework for building admin apps and B2B back offices in React. Its README says it is free to use, even for commercial purposes, and Marmelab sells an optional Enterprise Edition with commercial support. You connect it to your API through data providers and get lists, filters, forms and authentication out of the box. Version 5.15.5 was released in October 2026.

9. Saltcorn: a small, MIT-licensed no-code database app builder

Saltcorn is an open-source no-code database application builder (MIT) for web and mobile apps with views, layouts and actions on top of PostgreSQL. It is much smaller than Appsmith or Budibase, but there is nothing to pay and no user limit. You can explore it for free on its multitenant instance at saltcorn.com, which the project says is for testing only, and then self-host it. Beta builds of version 1.7 came out in October 2026.
Join ElonaHunt (like ProductHunt but for women) and explore the coolest women-focused startups out there!

Discover your next big inspiration and connect with like-minded female entrepreneurs!

👉 Join the Hunt Here

Retool Alternatives That Are Discontinued, Changed or Not a Fit

The 2025 version of this article listed ten tools. Five of them no longer belong on an open-source Retool shortlist:
  • Openblocks: its last release, v1.1.8, dates from March 2023, there have been no code changes since then and openblocks.dev returns an error. The project lives on as Lowcoder (number 5 above).
  • ILLA Builder: still Apache 2.0 on GitHub, but its last release, 4.8.5, came out in August 2024, the last code change was in May 2025 and the illacloud.com website no longer loads. Treat it as unmaintained.
  • NocoDB: still very active, but it is an Airtable-style database rather than an app builder, and its licence file (updated January 2026) now uses the Sustainable Use License, which allows internal business use but is not an open-source licence. Our open-source Notion alternatives cover more database-style tools.
  • Appwrite: an active, BSD-3-licensed backend (authentication, databases, storage), not a UI builder. It works well as the backend under Refine or React-admin, but it does not replace Retool on its own.
  • Directus: often suggested as a Retool alternative for data admin panels, but its code now uses the Monospace Sustainable Core License, so it is source-available rather than open source.

Which Open-Source Retool Alternative Should You Choose?

  • You want the closest Retool replacement: Appsmith, with the most permissive licence (Apache 2.0) and no user limit when self-hosted.
  • You want AI to draft the app for you: ToolJet, or NocoBase if you let coding agents build a whole business system.
  • Nobody on your team writes code: Budibase, or Saltcorn if you need something very simple and fully free.
  • You build apps for customers as well as for your team: Lowcoder.
  • Your internal tools are mostly scripts and jobs: Windmill.
  • Your team writes React and wants full control of the code: Refine or React-admin.

How Founders Use Open-Source Internal Tools

For a small startup, an internal tool is usually the first admin panel for your own product: a screen to look up customers, refund an order, approve a sign-up or fix a record without opening the database. Start with one painful manual task, build a single app for it and connect it to a read-only database user first. Before you choose a platform, read the 8 biggest mistakes when choosing no-code tools and the hidden costs of no-code AI development. If you are still building the product itself, compare low-code and AI coding tools for prototyping and the best no-code AI app builders for startups.
Internal tools pair well with automation. Connect your apps to the rest of your stack with one of the open-source Zapier alternatives, or follow our n8n guide for beginners. If you like to self-host, we have also checked open-source GitHub Copilot alternatives for coding, open-source Intercom alternatives for customer chat and open-source Expensify alternatives for expenses. Need a public landing page rather than an internal app? See our free Carrd alternatives. Before you build anything, validate your startup idea with real users, and write the help articles for your product with the F/MS AI SEO Tool so customers find them in Google and AI assistants.

FAQ About Open-Source Retool Alternatives

What is the best open-source alternative to Retool?

Appsmith is the closest match: a drag-and-drop internal tool builder with JavaScript, connections to databases and APIs, an Apache 2.0 licence and a free self-hosted Community Edition. ToolJet is the strongest alternative if you want AI to generate apps from a prompt.

Can I self-host Retool for free?

No. When we checked in October 2026, Retool's pricing page listed self-hosting only on the Enterprise plan, which is priced through sales. The free plan is cloud-only and covers up to 5 users.

Is Appsmith really free?

Yes. The Community Edition is open source under Apache 2.0 and free to self-host. In the cloud, the free plan covers up to 5 users, and Business costs $15 per user per month.

Which open-source Retool alternative has AI features?

ToolJet generates apps from plain-English descriptions and has an agent builder, NocoBase has AI employees and lets coding agents build the system, Budibase has AI agents in beta, and Windmill runs AI agents next to scripts and workflows. Check which AI features are in the free edition before you rely on them.

What happened to Openblocks?

Openblocks stopped releasing in March 2023 and its website no longer works. Lowcoder continues the project under the AGPL-3.0 licence and released a new version in October 2026.

Is ILLA Builder still maintained?

It does not look like it. Its last release came out in August 2024, the last code change was in May 2025 and the illacloud.com website no longer loads. Use Appsmith, ToolJet or Lowcoder instead.

Is NocoDB still open source?

Not in the strict sense. Its licence file now uses the Sustainable Use License, which allows use for your own internal business purposes but limits commercial redistribution. It is also a database with a spreadsheet interface rather than a Retool-style app builder.

Which Retool alternative is best for non-developers?

Budibase, because it combines apps, data tables and automations without code, and its free self-hosted plan has no user limit. Saltcorn is a simpler, fully free option.

Should developers use Refine or React-admin instead of a low-code builder?

If your team writes React and wants to own every line of code, yes. Both are MIT-licensed frameworks for admin panels and internal tools. React-admin had a new release in October 2026, while Refine's core package was last released in April 2026.

Where can I get a backlink by writing about my startup?

You can publish a guest post in one of the Fe/male Switch startup blogs, which rank in Google and in AI tools. Get a quality backlink.

About the Author

Violetta Bonenkamp, also known as MeanCEO, is an experienced startup founder with an impressive educational background including an MBA and four other higher education degrees. She has over 20 years of work experience across multiple countries, including 5 years as a solopreneur and serial entrepreneur. Throughout her startup experience she has applied for multiple startup grants at the EU level, in the Netherlands and Malta, and her startups received quite a few of those. She’s been living, studying and working in many countries around the globe and her extensive multicultural experience has influenced her immensely.
2026-10-27 22:47 Top Alternatives