notion-alternative
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Slab
A wiki built by the person behind Quill, run on $2.2M raised eight years ago, quietly serving Asana, Ramp, and A24 while louder rivals burn nine figures.
Slite
The AI knowledge base that stays accurate - synced with your tools, verified by your team, trusted by every agent that depends on it.
Nuclino
A modern, simple, and blazingly fast way to collaborate - bring knowledge, docs, and projects together in one place.
Tana
Tana is an AI-native workspace that turns messy notes, meetings and voice memos into structured, queryable knowledge. Its signature feature, Supertags, lets any bullet point become a database record with defined fields, so notes double as a living knowledge graph that AI agents can read, summarize and act on. Founded in 2021 by ex-Googlers and productivity builders and based in Palo Alto with an engineering hub in Oslo, Tana raised a $14M Series A in February 2025 (led by Tola Capital), reaching $25M total funding after emerging from a stealth beta with a 160,000+ person waitlist.