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Best Free Knowledge Bases of 2026

Updated · 4 picks · live pricing · affiliate disclosure

Atlassian-owned since 2004 with deep Jira integration; ~85k businesses using.",

BEST OVERALL7.1/10Save $30/yr

Confluence

Atlassian-owned since 2004 with deep Jira integration; ~85k businesses using.",

Free up to 10 users; cancel anytime
Try ConfluenceSee full review

How it stacks up

  • Free up to 10 users

    vs Notion Wiki Free

  • Standard $5.50/user upgrade

    vs Slite Free 50 docs

  • ~85k businesses

    vs Tettra Free Slack

#2
Slite6.6/10

From $8/mo

View
#3
Notion Wiki5.6/10

From $12/mo

View

All picks at a glance

#PickBest forStartingScore
1ConfluenceBest free mainstream incumbent, Atlassian Jira integration depth$5.50/mo7.1/10
2SliteBest free async team docs, Q&A plus Slite AI on the free tier$8.00/mo6.6/10
3Notion WikiBest free modern wiki, unlimited pages with database blocks$12.00/mo5.6/10
4TettraBest free Slack-native Q&A, ask-the-team workflow on free$8.33/mo5.3/10

Quick pick by use case

If you only have thirty seconds, find your situation below and skip to that pick.

If I am solo or very small team already on Notion for projects or PKMNotion WikiNotion Wiki Free unlimited pages with database blocks; Plus $12/member upgrade.If I am a distributed team that wants async Q&A workflow plus AI without payingSliteSlite Free 50 docs across 10 members with Slite AI included; Standard $8/member upgrade.If I am a Slack-first team up to ten users that captures knowledge from chat threadsTettraTettra Free up to 10 users with Slack-native Q&A; Scaling $8.33/user upgrade.If I am a small engineering team already on Atlassian Jira or TrelloConfluenceConfluence Free up to 10 users with Jira integration; Standard $5.50/user upgrade.

Compare all 4 picks

Top spec
#1Confluence7.1/10$5.50/mo$66.00/yrSave $30/yrFree up to 10 users
#2Slite6.6/10$8.00/mo$96.00/yr—Free 50 docs + AI
#3Notion Wiki5.6/10$12.00/mo$120.00/yr$48/yr moreFree unlimited pages
#4Tettra5.3/10$16.66/mo$200.00/yr$103.92/yr moreFree up to 10 users
#1

Confluence

7.1/10Save $30/yr

Best free mainstream incumbent, Atlassian Jira integration depth

Try ConfluenceSee Confluence alternatives

Atlassian-owned since 2004 with deep Jira integration; ~85k businesses using.",

PlanMonthlyAnnualWhat you get
FreeFree—Free for up to 10 users with unlimited pages, basic templates, and Jira integration
Standard$5.50/mo$66.00/yr$5.50 per user a month annual with page versioning, granular permissions, and 250GB storage
Premium$10.50/mo$126.00/yr$10.50 per user a month annual with analytics, bulk archive, audit logs, and unlimited storage
EnterpriseCustomCustomCustom pricing with SAML SSO, data residency, premier support, and unlimited Atlassian access

Confluence is the mainstream-incumbent free pick and the right call for engineering teams already on the Atlassian stack. Atlassian-owned since 2004 with around eighty-five thousand businesses using. The wedge for free readers: Jira integration depth ships on free for up to ten users, the only catalog free pick where deep enterprise-stack integration costs nothing for small teams.

Free covers up to ten users with unlimited pages, basic templates, and Jira integration. Standard is the upgrade tier at five dollars fifty cents monthly per user with page versioning, granular permissions, and 250GB storage. Premium at ten dollars fifty cents per user adds analytics, audit logs, and unlimited storage. Most small engineering teams stay on Free until the team grows past ten users; Standard is the upgrade trigger.

The trade-off versus Notion Wiki is editor polish; Confluence's UI is denser and the editor is less polished than modern picks. The trade-off versus Slite is async workflow; Confluence is page-based while Slite ships Q&A workflow. For engineering teams already on Jira or Trello, Confluence Free is the right call.

Pros

  • Free covers up to ten users with unlimited pages and Jira integration
  • Around eighty-five thousand businesses using; the brand reference for enterprise team docs
  • Deep Jira integration is the load-bearing differentiator for engineering teams
  • Standard upgrade at five dollars fifty cents per user with page versioning and permissions
  • Atlassian Cloud and Data Center options for compliance flexibility

Cons

  • UI denser and editor less polished than Notion Wiki or Slite
  • Free is capped at ten users; teams growing past ten require Standard upgrade
Free up to 10 usersStandard $5.50/user upgrade~85k businessesFree up to 10 users; cancel anytime

Best for: Small engineering teams already on Atlassian who want the brand reference team-docs platform with Jira integration on free.

Authoring
8
Discovery
9
Workflow
7
Value
9
Support
9
Try Confluence
#2

Slite

6.6/10

Best free async team docs, Q&A plus Slite AI on the free tier

Try SliteSee Slite alternatives

Slite AI Q&A on the free tier plus verified docs workflow; Paris-based since 2016.

PlanMonthlyAnnualWhat you get
FreeFree—Free up to 50 docs with 10 free integrations, Slite AI Q&A, and up to 10 members
Standard$8.00/mo$96.00/yr$8 per member a month annual with unlimited docs, verified docs workflow, and unlimited Slite AI
Premium$12.50/mo$150.00/yr$12.50 per member a month annual with roles + permissions, audit logs, public docs custom domain, and API access

Slite is the async Q&A free pick and the right call for distributed teams that want AI Q&A workflow without paying. Founded 2016 in Paris by Christophe Pasquier. The wedge for free readers: Slite AI Q&A ships on the free tier with Q&A workflow and verified docs, the only catalog free pick where AI knowledge retrieval costs nothing.

Free covers up to fifty docs across ten members with ten free integrations and Slite AI Q&A. Standard is the upgrade tier at eight dollars monthly per member with unlimited docs, verified docs workflow, and unlimited Slite AI. Premium at twelve dollars fifty cents per member adds roles, audit logs, and custom domain. Most distributed teams stay on Free until docs cross the fifty-doc ceiling; Standard is the upgrade trigger.

The trade-off versus Notion Wiki is bundle scope; Slite is team-docs-focused while Notion Wiki sits inside the broader Notion platform. The trade-off versus Tettra is Slack integration depth; Slite ships Slack integration but Tettra is Slack-native with Q&A bot. For distributed teams that want async Q&A with AI on free, Slite is the right call.

Pros

  • Slite AI Q&A available on the free tier; the only catalog free pick with AI knowledge retrieval
  • Free covers up to fifty docs across ten members for evaluation
  • Standard upgrade at eight dollars per member with unlimited docs and verified workflow
  • Q&A workflow plus verified docs combine on free for async-team capture pattern
  • Paris-based since 2016 with strong async-collaboration positioning

Cons

  • Fifty-doc ceiling on free is restrictive for production team-docs workloads
  • No SAML SSO at Standard or Premium; enterprise contract required
Free 50 docs + AIStandard $8/member upgradeAI on FreeFree up to 50 docs and 10 members with AI

Best for: Distributed teams that want Q&A workflow plus AI knowledge retrieval on a generous free tier with up to ten members.

Authoring
7
Discovery
8
Workflow
9
Value
10
Support
7
Try Slite
#3

Notion Wiki

5.6/10$48/yr more

Best free modern wiki, unlimited pages with database blocks

Try Notion WikiSee Notion Wiki alternatives

Verified pages plus databases plus teamspaces inside Notion; ~30M users since 2013.

PlanMonthlyAnnualWhat you get
FreeFree—Free for personal wikis with unlimited pages, 7-day version history, and sync across devices
Plus$12.00/mo$120.00/yr$12 per member a month with unlimited file uploads, verified pages, 30-day history, and team workspaces
Business$20.00/mo$216.00/yr$20 per member a month with SAML SSO, private team spaces, 90-day history, and advanced permissions

Notion Wiki is the modern-database free pick and the right call for solo creators and very small teams already on Notion. Founded 2013 in San Francisco with around thirty million users. The wedge for free readers: database blocks as primary primitives ship on the free tier with unlimited pages, the only catalog free pick where modern wiki primitives compete with paid wikis at zero cost.

Free covers personal wikis with unlimited pages, 7-day version history, and sync. Plus is the upgrade tier at twelve dollars monthly per member with verified pages, 30-day version history, and team workspaces. Business at twenty dollars per member adds SAML SSO and 90-day history. Most solo Notion users stay on Free indefinitely; Plus is the upgrade trigger when a team forms or verified-pages workflow becomes load-bearing.

The trade-off versus Slite is Q&A workflow; Notion Wiki ships pages-first while Slite ships Q&A workflow with AI. The trade-off versus Tettra is Slack integration; Notion Wiki has Slack integration but Tettra is Slack-native. For solo creators and very small teams that already use Notion for projects or PKM, Notion Wiki Free is the right call.

Pros

  • Free covers unlimited pages with database blocks as primary primitives
  • Around thirty million users; the modern brand reference for database-first wikis
  • 7-day version history on free for evaluation and small-team use
  • Plus upgrade at twelve dollars per member adds verified pages and 30-day history
  • Notion AI integrated 2025; works across the broader Notion platform

Cons

  • Free is most useful for personal wikis; team workspaces require Plus upgrade
  • Database blocks have a learning curve compared to plain-text wikis
Free unlimited pagesPlus $12/member upgrade~30M users since 2013Free unlimited pages personal; cancel anytime

Best for: Solo creators and very small teams already on Notion who want database-backed pages on the free tier without per-user billing.

Authoring
7
Discovery
9
Workflow
9
Value
9
Support
9
Try Notion Wiki
#4

Tettra

5.3/10$103.92/yr more

Best free Slack-native Q&A, ask-the-team workflow on free

Try TettraSee Tettra alternatives

Deep Slack-first integration with Q&A bot, ask-the-team flow, and verified pages with expiry.

PlanMonthlyAnnualWhat you get
BasicFree—Free for up to 10 users with Slack integration, Q&A workflow, and limited content storage
Scaling$8.33/mo$100.00/yr$8.33 per user a month annual with unlimited content, AI Q&A bot, and verified pages workflow
Professional$16.66/mo$200.00/yr$16.66 per user a month annual with SSO, custom domain, audit logs, and advanced analytics

Tettra is the Slack-native free pick and the right call for Slack-first teams that capture knowledge from chat threads. Founded 2015 in Boston by Andy Cook and Nelson Joyce, bootstrapped indie. The wedge for free readers: deep Slack integration with ask-the-team Q&A workflow ships on free for up to ten users, the only catalog free pick where Slack-native capture is the load-bearing primary feature at zero cost.

Free covers up to ten users with Slack integration, Q&A workflow, and limited content storage. Scaling is the upgrade tier at eight dollars thirty-three cents monthly per user with unlimited content, AI Q&A bot, and verified pages workflow. Professional at sixteen dollars sixty-six cents per user adds SSO and audit logs. Most Slack-first teams stay on Free until content storage becomes a bottleneck; Scaling is the upgrade trigger.

The trade-off versus Notion Wiki is workflow scope; Tettra is Slack-native Q&A while Notion Wiki ships database-backed pages. The trade-off versus Slite is platform breadth; Tettra is Slack-first specifically while Slite is async-team-docs broadly. For Slack-first teams up to ten users, Tettra Free is the right call.

Pros

  • Free covers up to ten users with Slack integration and Q&A workflow
  • Deep Slack-first integration with ask-the-team capture pattern
  • Verified pages workflow with automatic expiry on Scaling upgrade
  • Bootstrapped indie since 2015 with long-term roadmap stability
  • Scaling upgrade at eight dollars thirty-three cents per user adds AI Q&A bot

Cons

  • Slack-first focus means low value if team uses Microsoft Teams or email primarily
  • Limited content storage on free; production volumes outgrow quickly
Free up to 10 usersScaling $8.33/user upgradeSlack-native Q&AFree up to 10 users with Slack Q&A

Best for: Slack-first teams up to ten users that want a knowledge base with ask-the-team-from-Slack capture pattern.

Authoring
7
Discovery
8
Workflow
9
Value
9
Support
7
Try Tettra

How we picked

Each pick gets a transparent composite score from price, features, free-tier availability, and editor fit. Pricing flows from our live database, so when a vendor changes prices the score updates here too.

We weight price at 40 percent, features at 30, free tier at 15, fit at 15. Notion Wiki leads because the modern database-backed pages plus verified content framework matches small-team launch shape better than per-user pricing models. See the parent /best/knowledge-base guide for paid-only tiers excluded from this lens.

We don't claim "30,000 hours of testing." Our methodology is the formula above plus the editor's published verdict for each pick. Verifiable, auditable, and updated when the underlying data changes.

Why trust Subrupt

We're a subscription tracker first, a buying guide second. Every claim on this page is something you can check.

By use case

Best free modern database wiki

Notion Wiki

Read the full review →

Try Notion Wiki

Best free Slack-native Q&A

Tettra

Read the full review →

Try Tettra

Best free async team docs

Confluence

Read the full review →

Try Confluence

Best free mainstream incumbent

Slite

Read the full review →

Try Slite

How to choose your Free Knowledge Base

Free tier ceilings vary across audience-specific shapes

The four catalog free picks differ on the load-bearing free-tier feature: user count, content volume, and integration depth. Notion Wiki Free is unlimited pages but most useful for solo or very small team workloads. Slite Free is fifty docs across ten members with AI knowledge retrieval included. Tettra Free is ten users with Slack integration and Q&A workflow as the load-bearing capture pattern. Confluence Free is ten users with deep Jira integration that no modern catalog pick matches at scale. The decision pivots on team capture pattern, not absolute ceiling.

Atlassian retired Confluence Server in February 2024

Atlassian retired Confluence Server in February 2024, forcing customers to migrate to Cloud or Data Center. Confluence Cloud free tier covers up to ten users with limits on storage and features. Existing Server customers received migration paths through 2024-2025. The retirement spike drove search volume for Confluence alternatives across the catalog. Confluence remains the mainstream-incumbent free pick for engineering teams already on the Atlassian stack; teams considering migration should evaluate Notion Wiki, Slite, Tettra, or Slab depending on workflow needs.

Slite AI on free is uniquely valuable for evaluation

Slite Free is the only catalog free pick that ships AI Q&A on the free tier. Most catalog picks gate AI features to paid tiers, including Notion AI on Plus and Tettra AI Q&A bot on Scaling. Slite AI on free covers semantic search across the up-to-fifty-doc workspace, summarization, and Q&A workflow with no credit card required. The trade-off is the fifty-doc ceiling restricts production workloads. For evaluation of AI knowledge retrieval before committing budget, Slite Free is the right call.

Out-of-catalog free knowledge-base options worth knowing

Free knowledge-base lists frequently include vendors we do not yet catalog as primary picks. Nuclino ships unlimited pages on free for up to ten team members with five gigabytes storage. BookStack is the free open-source self-host pick with MIT license and unlimited everything on customer infrastructure. DokuWiki ships file-based wiki on customer infrastructure with no database required. MediaWiki powers Wikipedia and works at massive scale on customer infrastructure. From our catalog the four picks listed here are the genuinely-free permanent paths; readers who specifically need Nuclino simplicity or BookStack OSS self-host should evaluate those projects directly.

When to upgrade past free to a paid tier (cross-link to parent)

Free paths cover most evaluation and small-team use cases but each pick has a clear upgrade trigger. Notion Wiki Free outgrows when verified pages or team workspaces become load-bearing; Plus at twelve dollars per member is the upgrade. Slite Free outgrows past fifty docs; Standard at eight dollars per member is the upgrade. Tettra Free outgrows past ten users or content storage; Scaling at eight dollars thirty-three cents per user is the upgrade. Confluence Free outgrows past ten users; Standard at five dollars fifty cents per user is the upgrade. At any of those triggers, see [our /best/knowledge-base guide](/best/knowledge-base) for the broader paid lineup including GitBook developer-docs-first, Slab clean-modern, and Document360 customer-facing public KB.

Frequently asked questions

Which free knowledge base has the most generous tier?

It depends on the load-bearing feature. Notion Wiki Free is most generous on raw page count with unlimited pages but limited team features on free. Confluence Free is most generous on enterprise integration with Jira up to ten users. Slite Free is most generous on AI knowledge retrieval with Slite AI on free. Tettra Free is most generous on Slack-native capture with Q&A workflow on free. The right pick depends on workflow shape.

What about Notion personal vs Notion Wiki team?

Notion is the broader platform; Notion Wiki is the team-docs surface inside Notion. The free tier covers personal wikis with unlimited pages, 7-day version history, and basic features. Team workspaces with verified pages and 30-day history require Plus at twelve dollars per member. For solo creators or very small teams Notion Free works as a wiki; for production team-docs the Plus upgrade is the standard path.

Why is Confluence still on the free tier list in 2026?

Atlassian retired Server in February 2024 but Confluence Cloud Free remains active for up to ten users. The free tier covers unlimited pages, basic templates, and Jira integration without per-user billing. Engineering teams already on Atlassian Jira or Trello get cross-product integration depth on free that no modern catalog pick matches. The free tier is capped at ten users; teams past that require Standard at five dollars fifty cents per user.

Does Subrupt earn a commission from these free picks?

On most paid upgrades. We disclose this on every /best page. Free tiers themselves have no transaction. Paid tiers on Notion Wiki, Slite, Tettra, and Confluence have plans where we earn commission only on conversion. The composite ranking weights price at 40 percent, features at 30, free tier at 15, fit at 15; none tuned by affiliate rate.

Why is Notion Wiki ranked first over the cheaper Slite or Tettra?

Notion Wiki wins on raw page count because unlimited pages on free matches small-team launch shape better than per-user or per-doc ceilings. Slite Free is fifty docs only; Tettra Free is ten users only; Confluence Free is ten users only. For solo creators or very small teams that scale up to many pages, Notion Wiki Free is the most flexible. Teams that prioritize Slack-native Q&A pick Tettra; teams that prioritize AI knowledge retrieval pick Slite.

Can I run a production team wiki on a free tier?

Yes for low-volume teams. Notion Wiki Free works for solo or very small team workloads with unlimited pages. Slite Free works for distributed teams under fifty docs with AI included. Tettra Free works for Slack-first teams up to ten users. Confluence Free works for engineering teams already on Atlassian up to ten users. The trade-off is no SLA, no dedicated support, and limits on advanced features. Production-critical workloads typically upgrade in the first quarter.

What about open-source self-hosted free knowledge bases?

BookStack under MIT license is the cleanest open-source self-host pick with unlimited everything on customer infrastructure. Outline ships BSL self-host as the second OSS catalog pick. DokuWiki and MediaWiki are out-of-catalog OSS options that work at scale on customer infrastructure. From our catalog primary picks BookStack is an honorable mention on the parent guide; readers who specifically need OSS self-host should evaluate BookStack directly.

How does Slite AI compare to Notion AI or Tettra AI?

Slite AI ships on the free tier with Q&A workflow, semantic search, and summarization across the up-to-fifty-doc workspace. Notion AI ships on Plus and Business at additional cost; the free tier does not include Notion AI. Tettra AI Q&A bot ships on Scaling at eight dollars thirty-three cents per user. For evaluation of AI knowledge retrieval before paying, Slite Free is the only catalog option.

EU data residency: which free picks store data in the EU?

Confluence ships EU regions on Standard and above with enterprise contracts. Notion Wiki has multi-region with EU on Business and Enterprise. Slite is Paris-based with EU-default infrastructure. Tettra is Boston-based with US-default. For default EU residency on free tiers, Slite is the cleanest catalog fit. Notion Wiki, Tettra, and Confluence ship EU regions on paid tiers only.

How often is this guide updated?

We re-review pricing and features annually at minimum, with mid-year refreshes when major vendor announcements happen. Atlassian retired Confluence Server February 2024. Notion Wiki Plus repriced from ten dollars to twelve dollars Q2 2025. Slite has shipped consistent free AI since 2024. Tettra has shipped consistent ten-user free tier since 2018. The lastReviewed date reflects the most recent editorial pass.

Subrupt Editorial

The team behind subrupt.com. We track subscriptions, surface cheaper alternatives, and publish buying guides where the score formula is on the page so you can recompute it yourself. We do not claim 30,000 hours of testing. What we claim is live pricing from our database, a transparent composite score, and honest savings math against a category baseline.

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Affiliate disclosure: Subrupt earns a commission when you switch to a service through our recommendation links. This never changes the price you pay. We only recommend services where there's a real cost or feature advantage for you, and our picks are based on the data on this page, not on which programs pay the most.

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