A collaborative wiki built on ATProto. Knowledge grows together.

What is Lichen?#

Sign in with your Bluesky account, create wikis, and write in plain markdown with [[wikilinks]]. Your data lives on your own PDS: it persists independently of this app, and your Bluesky identity works everywhere on ATProto.

Features#

• Wikilinks and backlinks: link notes with [[double brackets]], backlinks are tracked automatically
• Revision history: every edit is a diff, full history is always available
• Access control: public or private wikis, with admin/contributor/viewer roles
• Real-time sync via the ATProto firehose
• Data portability: your wikis and notes are ATProto records on your PDS, not locked in
• Markdown editor with split-pane live preview, image upload via drag-drop/paste
• Multilingual UI (English and French)
• Self-hostable: deploy your own instance, fully independent

How it works#

Contributors write directly to their own Personal Data Server via OAuth. The Lichen appview ingests those records from the network firehose, assembles wiki state, and serves reads. Your data is never locked in: it follows you across the ATProto ecosystem.

Contributing#

See CONTRIBUTING.md.

License#

Code: AGPL-3.0

Wiki content: User contributions on lichen.wiki are licensed under CC BY-SA 4.0 by default. Contributors retain copyright and grant reuse rights under this license. Private wikis are still covered by CC BY-SA 4.0, but access is restricted to members.