Free customer support · knowledge management in the Top 11

6 providers in the Top 11 Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026 offer a free tier; the most credible is Guru.

Why this answer

Filtered to entries with a published free tier (not just a free trial). When the pricing page is ambiguous we err conservative — paid-only by default.

Showing all 6 matches. Top 11 publishes whatever the data supports — we don’t pad lists. See the full ranked Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026.

  1. #1Guru(rank #4 in Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026)

    Free tier

    Pushes trusted internal knowledge directly into your team's existing workflows and tools.

    Full Guru review · Compare: Guru vs Confluence · Alternatives

  2. #2Confluence(rank #5 in Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026)

    Free tier

    The industry standard for internal technical documentation, with deep Jira integration.

    Full Confluence review · Alternatives

  3. #3Notion(rank #6 in Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026)

    Free tier

    An incredibly flexible all-in-one tool with a best-in-class editor for building custom internal wikis.

    Full Notion review · Alternatives

  4. #4Slab(rank #7 in Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026)

    Free tier

    A clean, fast, and focused alternative to Confluence for modern internal knowledge bases.

    Full Slab review · Alternatives

  5. #5Freshdesk(rank #9 in Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026)

    Free tier

    A capable KB within a feature-rich, affordable, all-in-one customer support suite.

    Full Freshdesk review · Alternatives

  6. #6GitBook(rank #11 in Document360 vs Zendesk Guide vs Intercom Articles: 11 Best Knowledge Base Software 2026)

    Free tier

    A specialized KB for creating beautiful, developer-friendly technical documentation and API references.

    Full GitBook review · Alternatives

Methodology: /methodology · No paid placement ever · Verified .