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Nullboard vs Kan: catalog facts
Nullboard	Kan
Free Free and open source under the BSD 2-Clause license.	Freemium Free to self-host under AGPL-3.0; the cloud service has a free start with paid plans.
Web	Web, Self-hosted
Stores board data locally in the browser Imports and exports board data as JSON	Imports boards from Trello Workspace members and per-board visibility
Minimalist feature set	Integrations are still listed as coming soon Self-hosting needs a PostgreSQL database
Web application	Self-hosted, Hosted service
Open source	Open source
License: BSD-2-Clause	License: AGPL-3.0
Not stated if an account is needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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