Best Self-Hosted Alternatives to Retool
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Retool is the internal-tool builder most engineering teams reach for first: drag widgets onto a canvas, bind them to your databases and APIs with JavaScript, add workflows, and hand the result to the people who need it. What sends teams looking elsewhere is the seat meter. Its pricing page bills every builder and every internal user per month, the free plan stops at five users, and self-hosting is offered but still metered (five users free, 100 on Team and Business, unlimited only on Enterprise). The self-hosted builders below put the same canvas-over-your-data idea on one server you size once, with no per-seat line.
Retool costs about $144/year and keeps your data on its servers. These researched, open-source alternatives give you the same workflow on hardware you own — here's what each needs to run.
The alternatives
Appsmith
LicenseApache-2.0 (Community Edition image; the Commercial edition is a separate image)CategoryLow-code internal toolsStackJava · TypeScript · MongoDB · RedisMin RAM8192 MBOfficial imageYesDifficulty2 / 5
Budibase
LicenseGPL-3.0 overall; packages/pro is BSL-1.1, app-runtime packages MPL-2.0CategoryLow-code internal toolsStackTypeScript · Svelte · CouchDB · RedisMin RAM6144 MBOfficial imageYesDifficulty2 / 5
NocoBase
LicenseApache-2.0 plus NocoBase supplementary terms (branding kept, no competing SaaS)CategoryLow-code internal toolsStackTypeScript · Node.js · PostgreSQLMin RAM2048 MBOfficial imageYesDifficulty2 / 5
ToolJet
LicenseAGPL-3.0 core; server/ee and frontend/ee are submodules from separate ToolJet reposCategoryLow-code internal toolsStackTypeScript · NestJS · PostgreSQL · RedisMin RAM4096 MBOfficial imageYesDifficulty3 / 5
What you give up by leaving Retool
Leaving Retool means giving up its polish, its connector catalogue, and a vendor that runs the service and ships the fixes. The four alternatives start from different places. Appsmith is the closest like-for-like: widgets bound to REST, GraphQL or database queries, one Apache-2.0 all-in-one container that asks for 8 GB of RAM. ToolJet adds a built-in database and workflow jobs beside the app builder, but its public repository is AGPL-3.0 with the paid features in private submodules. Budibase is built around its own CouchDB-backed data store plus external sources, GPL-3.0 with a Business Source License on its paid package. NocoBase starts from the data model and composes pages, workflows and permissions over it through plugins; its Apache-2.0 licence carries supplementary terms that forbid rebranding it or reselling it as a platform. SSO, audit logs and branding controls sit in paid editions of all four, so read each app's caveats before assuming the whole bill disappears.
Where to host itaffiliate disclosure
Kamateratrial any of these on
The entry tier is a free trial — fine for a first look. Size it up (or run the 2 vCPU / 4 GB box the cost figures above assume) once you're keeping it.1 vCPU · 1 GB RAM · 20 GB SSD · $4.00/moDigitalOceanalso works on
From $6/mo · 1 vCPU / 1 GB / 25 GB · US + EU + AsiaPaid link — we earn a commission if you shop through it.
Head-to-head
Low-code internal toolsOct 2026
Appsmith
vsToolJet
One Apache-2.0 container for screens over your data, or AGPL screens plus workflows and a built-in database.
Read the verdict →
Low-code internal toolsOct 2026
Budibase
vs
Appsmith
A builder with its own CouchDB-backed database vs. a lighter screen over the data you already have.
Read the verdict →
Common questions
Are these Retool alternatives really free?
The software is open-source and free to run. Your only cost is the server it runs on — often a few dollars a month, less than most SaaS subscriptions.
How much server do I need to self-host one?
Most of these run comfortably on a small VPS — 1–2 GB of RAM is enough for a single-user or small-team setup. Each app's page lists its minimum RAM.
Will I lose features by leaving Retool?
It depends on the app. The alternatives below cover the core workflow; polish and integrations vary, so check each one's stack and difficulty before you commit.