Thinkstack alternatives

Tools that do what Thinkstack does, found by what they say they do rather than by shelf. Among the equally alike, the most used come first. Each line says how it differs from Thinkstack.

Read 2026-10-25 · Thinkstack itself: Free plan · From $5/user/mo

With a free plan or free to use: Heybrain, Tana, ChatYT, OKF Index, Onyx, Dust.

10 alternativesUnlike Thinkstack

#1
Glean Knowledge
Indexes company apps like Slack, Drive and Jira into one permission-aware search, with a chat assistant and agents that answer from that index.
More widely used
63.5k
Active
Contact sales
2019
#2
Heybrain Knowledge
Connects company documents, conversations, and tools into a shared AI knowledge base that teams and agents query with source attribution and permission controls.
Same job
Little sign of use
Active
From $5/user/mo
#3
Tana Knowledge
Outliner workspace that stores notes, tasks and meeting transcripts as linked nodes with typed fields, plus an assistant that acts on them.
Costs moreAlso: Workflow automation
11.4k
Active
From $20/user/mo
2021
#4
ChatYT Knowledge
Chat with YouTube videos to get summaries, ask questions, take notes, and export to PDF.
Also: Summarization, Chat assistantMore widely used
289
Active
From $1 once
#5
Budi Knowledge
Answers employee questions from a company's SOP and policy documents with source citations, and generates training material from them.
Also: Chat assistant, SearchMore widely used
62
Active
#6
Perplexity AI assistants
AI search engine that answers questions from live web sources with citations, with plans for teams and companies.
More widely used
4.2M
2022
#7
OKF Index Knowledge MCP · open
Indexes published knowledge bundles and converts documents into searchable private bases served through an API and MCP tools.
Also: SearchOwn MCP server
Little sign of use
Active
#8
Onyx Knowledge
Open source AI chat platform that searches your docs, apps and knowledge base to answer questions with grounded responses.
Open sourceCosts more
27.3k
Active
From $20/user/mo
#9
Dust Knowledge
Connects company knowledge and tools so teams can create, share, and run AI agents across workflows with human oversight.
Also: Workflow automationMore widely used
3.7k
Active
From ≈ $34/user/mo
#10
Learny Brain Documents
Searches connected tools and documents to answer questions in plain language with source citations.
More widely used
25

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How this list is made: the words Thinkstack is described with (what it does, for whom, what it is used for) are matched against every tool in the Atlas. A tool on the same shelf, or doing the same kind of work, counts for a little more. Nothing here is paid for.