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REI3 vs Appsmith: catalog facts
REI3	Appsmith
Freemium Free for private and commercial use, with optional enterprise features and services.	Freemium The open-source edition is free to self-host; a cloud service and sales-led offerings are…
Web, Self-hosted	Web, Self-hosted
Build custom business apps without much code Library of free ready-made applications	Connects to many databases and any API Drag-and-drop UI with full JavaScript customisation
Building your own applications takes time to learn Some features are part of paid enterprise offerings	Aimed at internal tools rather than public-facing apps Some features are promoted through demos and sales
Self-hosted	Self-hosted, Hosted service
Open source	Open source
License: MIT	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.