What it is
DeepWiki turns a GitHub repository into a browsable wiki with architecture diagrams, summaries linked to source files, and a chat box that answers questions about the code. For a public repo, you swap github.com for deepwiki.com in the URL. It is made by Cognition, the company behind the Devin coding agent, and launched on 25 April 2025.
A free MCP server at mcp.deepwiki.com needs no login and gives agents three tools: read a repo's wiki structure, read its pages, and ask a question. Private repositories are handled inside the Devin app, where wikis are generated when you connect repos and can be steered with a .devin/wiki.json file.
Our review
DeepWiki earns its place on effort, not accuracy. Swap github.com for deepwiki.com in a URL and you get an architecture overview, diagrams and a chat box grounded in the source, with nothing to install and no account. Cognition said in May 2025, ten days after launch, that it had indexed more than 50,000 of the top public repositories, and an unindexed one is built on first request in somewhere between 30 seconds and a few minutes, according to a 2026 guide.
Freshness is the weak spot, and it is worse than the word "scheduled" suggests. In a one-day spot check on 6 October 2026, repowise, a competitor that says so openly, found DeepWiki's flask wiki dated 5 April and 33 commits behind, and gin's dated 14 May and 29 commits behind. Guides citing DeepWiki's FAQ say repos carrying its README badge refresh roughly weekly; everything else waits for a request. Open GitHub issues report "Repository not found" from the MCP tool on indexed repos and refreshed wikis with wrong product descriptions.
The MCP server at mcp.deepwiki.com is the part developers will use most. It needs no key, exposes three tools (read the wiki structure, read a page, ask a question) over streamable HTTP, and lets any agent look up a library before calling it. It cannot target a branch, tag or commit, a gap users have asked Cognition to close, so an agent working against an older release may read docs for main. Rate limits are not published.
Private code moves you into Devin. Wikis are generated when you connect repositories, Medium and High effort are billed in ACUs, and a .devin/wiki.json file lets you fix the page plan, capped at 30 pages (80 on Enterprise). One oddity in the docs: Enterprise organisations always run at low effort and cannot change it, so the largest customers get the cheapest wiki tier. Sourcegraph and Greptile answer from a live index rather than a generated document, which matters more the faster a codebase changes.
Where it earns its place
A backend engineer evaluating three open-source job-queue libraries
Understand how each handles retries and persistence before choosing one
Open each repo on deepwiki.com and ask targeted questions; answers link to the source files, so claims can be checked in minutes. Free, but check the wiki's index date against recent commits before trusting it on anything that changed lately.
A developer running Claude Code or Cursor against unfamiliar dependencies
Let the agent read library internals without pasting docs into the prompt
Add https://mcp.deepwiki.com/mcp as a remote MCP server; the agent calls ask_question on the dependency's repo. No key or cost, but it answers about main, not the version pinned in your lockfile.
An engineering manager onboarding four new hires to a private monorepo
Give newcomers a written tour of the codebase without a senior engineer writing it
Connect the repo to Devin, define the sections in .devin/wiki.json and generate at Medium (about 5–10 ACUs) or High (20–40). Needs a Devin subscription or credits; the 30-page cap means very large repos need a deliberate page plan.
Before you commit
- Setup
- Public repos need nothing: change the URL. The MCP server is a single URL in your client config; Cursor and most clients expect the key "url", and the docs warn an unrecognised field makes the server silently ignored.
- Integrations
- Remote MCP over streamable HTTP (SSE is being deprecated); Ask Devin and the Devin MCP server, with an API key, cover private repos.
- Data and privacy
- The public product covers public code only. Cognition does not publish a separate DeepWiki retention or training policy; private-repo wikis fall under the Devin account.
- Cost at scale
- Public use is free. A 10-developer team on Devin Teams pays $80 plus $400 in seats, $480 a month, before ACUs for Medium or High wikis; the pricing page does not list a per-ACU price.
- Limits
- 30 pages per wiki (80 on Enterprise), 100 notes, 10,000 characters per note. Refresh timing is not published, and MCP rate limits are not published.
What's good
- Free wikis for public GitHub repos with no sign-up
- No-key MCP server with three tools any agent can call
- Diagrams and answers linked to source files
- Private-repo page plans can be fixed with .devin/wiki.json
What's not
- Public wikis were 29 to 33 commits behind in an October 2026 spot check
- AI-written pages cannot be hand-edited
- MCP cannot query a specific branch, tag or commit
- Private repos require Devin; Medium and High wikis cost ACUs
- Enterprise orgs are locked to low-effort wikis
Best for
Developers and agents who need to understand an unfamiliar public repository quickly and for free.
Alternatives
DeepWiki: common questions
- Is DeepWiki worth it?
- For a public repo DeepWiki is a free, decent first map of the code, but it is an AI-written snapshot that can be months old, so treat it as a guide to where to look rather than an answer. We rate it 4.0 out of 5.
- How much does DeepWiki cost?
- Free for public GitHub repos, including the MCP server. Private repos need a Devin account (Pro $20/month; Teams $80/month plus $40 per developer seat). Low-effort wikis are free; Medium costs about 5 –10 ACUs per wiki and High about 20–40, charged to a subscription or credits.
- What are the downsides of DeepWiki?
- Public wikis were 29 to 33 commits behind in an October 2026 spot check; aI-written pages cannot be hand-edited; mCP cannot query a specific branch, tag or commit; private repos require Devin; Medium and High wikis cost ACUs; enterprise orgs are locked to low-effort wikis.
- Who is DeepWiki best for?
- Developers and agents who need to understand an unfamiliar public repository quickly and for free.
- How much does DeepWiki cost for a team or in production?
- Public use is free. A 10-developer team on Devin Teams pays $80 plus $400 in seats, $480 a month, before ACUs for Medium or High wikis; the pricing page does not list a per-ACU price.
- Is DeepWiki safe for company data?
- The public product covers public code only. Cognition does not publish a separate DeepWiki retention or training policy; private-repo wikis fall under the Devin account.
- What are the best DeepWiki alternatives?
- The closest alternatives we have reviewed are Sourcegraph, Greptile and Devin (incl. Devin Desktop, formerly Windsurf).
Answers checked Oct 23, 2026.
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