9 Best Wiki Software of 2026

Confluence takes first place because it gives a growing team the most complete wiki structure for the lowest per-user price here. Content lives in spaces with a page tree, page versioning, templates and macros, and the Standard plan adds Atlassian's Rovo search, chat and agents, free guest access and advanced permissions for $5.78 per user per month. Databases and whiteboards sit inside the same pages, so a team can keep a project tracker or a planning board next to the policy it relates to. The free plan is generous for a small team at up to 10 users, though storage stops at 2 GB and whiteboards are limited to 3 active per user. The weaker points are setup and security costs: the page tree takes planning to stay tidy, and SSO and SCIM need an Atlassian Guard Standard subscription on every plan below Enterprise. Unlimited storage, admin insights and the dynamic intranet are Premium features at $11.16.

Nuclino ranks third because it is quick to learn and cheap to run for a whole team. Documents, called items, are edited together in real time and can be shown as a list, a board, a table or a graph that maps how pages link to each other. Canvases add whiteboards and diagrams without a separate tool. The Starter plan at $6 per user per month billed yearly removes the 50 item cap of the free plan and adds admin tools, publishing, 30 days of version history and 10 GB of storage per user. Business at $10 per user adds Sidekick, the built-in AI that answers questions and drafts content, plus the audit log, team insights, SAML SSO and unlimited history. The limits are depth and billing: its pricing page lists no page verification feature, and Nuclino counts guests and read-only members as paid users, which raises the cost when a large company only needs most people to read.

Slab is the easiest wiki on this list to roll out to a whole company. It keeps the model simple, with posts grouped into topics, real-time editing and templates, and a unified search. Verification is available on every plan, including the free one, so owners can mark which pages are current, which matters more for a wiki than any editor feature. The free plan covers up to 10 users with 90 days of version history and 10 standard integrations. The Startup plan at $6.67 per user per month billed annually removes the user cap, adds private topics, AI Autofix and a year of history. The trade-off is that the AI question answering feature, AI Ask, plus SAML SSO and SCIM provisioning only arrive on Business at $12.50, and audit logs are held back for Enterprise, which needs at least 100 users. Teams that need databases or task tracking inside the wiki will find Slab deliberately narrow.

Notion is the most flexible option here, which is both its strength and its cost. A wiki page can hold databases with custom properties, linked tasks and embedded views, so a team handbook can sit next to its project tracker and meeting notes. The Business plan adds the pieces that matter most for a company wiki: a verified badge for pages that are current, which also appears in search results and AI citations, private teamspaces for sensitive content, SAML SSO and Notion Agent, which handles multi-step tasks using your workspace and connected apps. AI Meeting Notes and Enterprise Search across tools such as Slack and GitHub are on Business too. The drawback is that Notion gives you blocks, not a wiki structure, so someone has to design the hierarchy and keep it tidy. Its pricing page here showed euros only, so the USD price check is pending.

Outline is the best value for a small team that wants a proper wiki with no per-seat math. Its cloud plans charge by team size: $10 per month for 1 to 10 members, $79 for up to 100 and $249 for up to 200, and every tier gets the same features. That includes unlimited documents and version history, real-time editing, comments, AI question answering over your docs, SSO, groups and permissions, the API and webhooks and a security audit log. Teams with strict data rules can self-host instead: the Community Edition is free with limited features and no support, and Business costs $4 per user per month billed annually with a 10 user minimum, adding SAML, guest users, structured data attributes and a direct Confluence importer. Outline keeps to documents, so it lacks the databases and whiteboards of Notion or Confluence, and there is no free cloud plan beyond the trial.

Slite suits teams that want a tidy wiki and AI answers from the first plan. Basic at $10 per user per month billed yearly includes unlimited docs, Ask for AI search and answers, doc verification, doc ownership and the Knowledge Management Panel, which lets admins clean up many pages at once. MCP and API access are included too. Pro at $20 adds the Slite Agent, which searches across your connected tools, fact-checks docs and suggests fixes, plus agent workflows, OpenID SSO and a custom domain for public docs. Answers also reach people in Slack. The limits are cost and caps: there is no free plan after the 14-day trial, Basic allows 30 Ask questions per seat each month, and SCIM, audit logs and reader-only seats are Enterprise features. A company with many readers and few writers pays for every member until it moves to Enterprise.

Tettra is built for teams whose questions start in Slack. Its AI answers questions in DMs and channels, summarizes threads and can mine existing Slack answers into wiki content, so a repeated question becomes a page instead of another message. Inside the wiki, the Scaling plan includes questions and answers, page requests, verification and reports on stale, unowned and public pages, which gives a knowledge owner a clear cleanup list. Permissions cover guest and read-only users, invite-only categories, page locking and groups. The price is $8 per user per month on yearly billing or $10 monthly, with a 10 user minimum, and a 30-day free trial. The weaknesses are in the extras: SSO and SCIM are paid add-ons on Scaling and only included on Enterprise, and the app itself is English only, although content can be in any language.

Guru is less a wiki than a layer that sits over the wiki and the other places company knowledge lives. It indexes connected sources while keeping their original access controls, detects duplicate and conflicting content, and can draft documentation from conversations, meetings and tickets before routing it to experts for review. Verification is its signature: Guru says it handles roughly 80 to 90% automatically using usage signals, content age and policy rules, escalating to people only when needed. Answers come through a Knowledge Agent chat, Q&A and a deep research mode, and every answer must cite its sources. MCP access lets other AI tools pull the same governed content. Security covers SAML SSO, SCIM, DLP masking of sensitive data, audit logs and SOC 2 Type II. The trade-off is fit and price: Guru now sells custom packages through sales only, so it scores lower on value for a team that just needs a place to write pages.

Document360 is a documentation platform first, and it works well as an internal knowledge base when content needs control. Writers can use Markdown or an advanced WYSIWYG editor, every article keeps revision history, and categories, tags and a glossary help readers find things as the library grows. You can run several knowledge bases as projects, keeping private ones for internal content and public ones for customers. Reusable content blocks and variables let you update a phone number or link once and have it change everywhere, and a custom workflow builder handles assignment, review cycles and publishing. Eddy AI, search analytics and embedded help round it out, and the vendor lists SOC 2 Type II, ISO 27001:2022 and GDPR. The downside for a team wiki is weight and price: Document360 sells customized quotes through a demo, and it lacks the casual collaboration features of Notion or Confluence.