Retool alternatives: 5 free & open-source picks
Curated, verified, and actually free. No trials, no crippled tiers. Star counts and last-activity dates checked by hand, not scraped and forgotten.
Internal apps, forms, automations, and portals in one box; much closer to Knack than its developer branding suggests.
licenseGPL-3.0
runsyour server
installDocker image or Docker Compose; Kubernetes is also supported
enginesModel-agnostic; the agent builder supports bring-your-own AI provider credentials
dataBuilt-in app data and app definitions are stored in CouchDB, files in MinIO/S3-compatible object storage, and connected external data remains in its source system
the catch vs RetoolBudibase is faster for standard CRUD but gives up Retool's fine-grained UI composition, custom-code flexibility, connector breadth, and debugging tools.
setupRequires Docker and persistent storage; production use also means owning upgrades, TLS, backups, and database/network access
facts verified 2026-08-10
Five people can build and run database-backed internal apps in the hosted product without paying.
licenseApache-2.0
runstheir cloud
installHosted signup for Appsmith Cloud Free
enginesAppsmith's AI/agent features use Appsmith-managed AI services; exact model availability is product-controlled rather than a local backend
dataApp definitions, users, and secrets live in Appsmith Cloud; connected business data remains in the source database/API, while query results pass through Appsmith
setup✓ installs clean
the catch vs RetoolAppsmith's hosted free product has a smaller connector, component, mobile, debugging, and production-observability surface than Retool.
facts verified 2026-08-10
A polished data studio with tables, forms, dashboards, flows, and APIs; free only below its organization-size ceiling.
licenseMSCL-1.0
runsyour server
installDocker Compose with SQLite for a test install, or a supported SQL database and persistent file storage for production
enginesOptional AI Assistant supports OpenAI, Anthropic, Google, and OpenAI-compatible endpoints with the operator's API key
dataBusiness records stay in the connected SQL database; assets live in configured local or object storage; Directus metadata is stored alongside the database
the catch vs RetoolDirectus is a polished data studio around a database, not a general arbitrary internal-app canvas, so bespoke multi-source tools require much more custom work.
setupRequires Docker, a secret, persistent database/uploads, backups, TLS, and attention to Directus's non-OSI license and free-tier limits
facts verified 2026-08-10
The same product is enough for one small team: five users, unlimited apps, every database and API connector, and role-aware actions.
licenseproprietary, free
runstheir cloud
installHosted signup in Retool Cloud
enginesRetool-managed AI models and agents; Free includes pooled AI credits and limited agent hours, while bring-your-own model keys are plan-dependent
dataApp definitions, Retool Database rows, and Retool file storage live in Retool Cloud; connected source data remains in the user's databases/APIs, although query results transit Retool
setup✓ installs clean
the catch vs RetoolIt is the same product under user, workflow, AI, governance, and support limits that become restrictive as soon as the internal tool serves more than a tiny team.
facts verified 2026-08-10
Two builders, 50 users, two apps, and the actual database and API connectors, not a screenshot-only trial.
licenseAGPL-3.0
runstheir cloud
installHosted signup for ToolJet Cloud Free
enginesToolJet AI uses vendor-hosted AI services and plan credits; bring-your-own LLM keys are an Enterprise add-on
dataApp metadata, ToolJet Database tables, secrets, and files live in ToolJet Cloud; connected source records remain in their external database/API
setup✓ installs clean
the catch vs RetoolToolJet's component and connector ecosystem, debugging experience, mobile tooling, and production polish are less mature than Retool's.
facts verified 2026-08-10
last updated 2026-08-10 · no votes, no pay-to-list · just what's real
| tool | license | running it | platforms | stars | active |
|---|---|---|---|---|---|
| Budibase | GPL-3.0 | docker to self-host | web, self-hosted | 27,902 | 2026-07 |
| Appsmith Free | Apache-2.0 | they host it | web | — | — |
| Directus Self-Hosted | MSCL-1.0 | docker to self-host | web, self-hosted | — | — |
| Retool Free | proprietary, free | they host it | web, ios, android | — | — |
| ToolJet Free | AGPL-3.0 | they host it | web | — | — |
People still pay for Retool because the builder is only useful when its runtime, connectors, permissions, and deployments remain boring for years. The recurring cost buys schema migration, auth, permissions, connector drift, queues, deployments, backups, and auditability, not just the visible interface. If none of that applies to you, any pick above saves $180 a year.
Is there a free alternative to Retool?
Yes: Budibase, Appsmith Free, Directus Self-Hosted and 2 more. Every tool on this page is either open source or genuinely free to use long-term: no trials, no crippled tiers.
Should I just build my own Retool?
Our verdict is PARCIAL. The core loop is buildable, but a dependable replacement becomes a real weekend or multi-day project. For Retool, build one internal CRUD tool over a trusted database with role-aware actions. The hard boundary is connectors, component library, permissions, workflows, and hosted runtime, plus connectors, runtime reliability, and governance. If you'd rather build, the exact one-shot prompt is free at puedovibecodearlo.app/retool.
