# The Best Secure Internal Wiki Software for Confidential Company Knowledge (2026)

> A security-first look at Confluence, Notion, GitBook, Guru, Outline, and Document360, covering SSO, SCIM, audit logs, and self-hosting for teams that treat their wiki as sensitive infrastructure.

Published: 2026-09-18 · By: The Security Desk

## The real risk isn't a hacker, it's a link

Most breaches involving internal wikis do not start with an attacker breaking encryption. They start with something more mundane: a workspace where anyone with the link can view a page, a contractor whose account was never deactivated, or a "public" toggle flipped on a page and left there for months. Confidential company knowledge, roadmaps, incident postmortems, HR policies, credentials references, source-of-truth runbooks, tends to accumulate in wikis precisely because they're easy to write in and easy to share. That same ease is the exposure. Before you pick a tool, decide what you actually need to control: who can see a page, who can prove they saw it, and how fast you can cut off access when someone leaves.

With that lens, six tools are worth serious consideration for teams that treat their wiki as sensitive infrastructure rather than a scratchpad.

## [Confluence](https://www.atlassian.com/software/confluence?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) (Atlassian)

Confluence is the default choice for larger organizations already inside the Atlassian ecosystem, and its security ceiling is high once you pay for it. Page-level and space-level permissions are mature, and Confluence supports SAML single sign-on. The catch is that SSO, SCIM user provisioning, and centralized audit logs are not bundled into the base product; they require the Atlassian Access add-on at roughly $4 per user per month on top of Standard or Premium, priced around $6.05 and $11.55 per user per month respectively on annual billing. Enterprise tier folds Atlassian Access in at no extra charge, which makes it the more economical path once an organization is large enough to need SSO by default. For a small team, Confluence's real security features are effectively locked behind a bundle most small teams don't buy.

## [Notion](https://www.notion.com/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list)

Notion has closed much of the security gap with Confluence over the past two years. The platform holds SOC 2 Type 2, ISO 27001, and HIPAA certifications, and encrypts workspace data at rest with AES-256 and in transit with TLS 1.2 or higher. SAML SSO arrives on the Business plan at $20 per user per month (or $15 annually), which also adds private teamspaces and granular database-level permissions, useful for keeping a legal or security team's pages out of the general workspace. SCIM provisioning, audit logs, and DLP/SIEM integrations are reserved for Enterprise, custom-priced. The gap for security-conscious teams is that on Free and Plus, at $10 a month, access control is essentially all-or-nothing, so anyone evaluating Notion for confidential knowledge should plan to budget for Business at minimum.

## [GitBook](https://www.gitbook.com/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list)

GitBook's strength is that ISO 27001 and SOC 2 apply across every paid plan, not just the top tier, which is unusual in this category. Where it draws a hard line is SSO: SAML single sign-on, along with formal legal and security reviews, is exclusive to the custom-quoted Enterprise plan and is not available on Premium ($65 per site per month) or Ultimate ($249 per site per month), both of which also charge $12 per user per month on top. That means a security-conscious team that wants both GitBook's clean authoring experience and enforced SSO has to skip the published tiers entirely and negotiate an Enterprise contract, with published estimates in the $15,000 to $30,000 a year range for a mid-sized team.

## [Guru](https://www.getguru.com/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list)

Guru has repositioned around AI-assisted knowledge search, and its security stack is built to match: SSO, SCIM provisioning, centralized audit logs across all consumers of a piece of knowledge, DLP masking, and encryption at rest and in transit, plus SOC 2 Type II, HIPAA, and GxP compliance. The tradeoff is transparency. Guru no longer publishes self-serve per-seat pricing on its site; the current offering is a scoped, sales-negotiated engagement based on organization size and knowledge complexity. That's workable for a mid-market or enterprise buyer who wants a security conversation with sales anyway, but it means you cannot budget Guru from the website alone the way you can with Notion or [Outline](https://www.getoutline.com/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list).

## Outline

Outline is the most concrete option here for a team that wants clear, published pricing tied to real limits. Starter is $10 a month flat for up to 10 team members but has no SSO. Team, at $79 a month for up to 100 members, and Business, at $249 a month for up to 200 members, both include SSO through Google, Slack, OIDC, or SAML, covering most identity providers including Okta and OneLogin. Outline's more distinctive security posture is architectural: the company says it deliberately does not build "god mode" admin tooling or support-side user impersonation into its own systems, so a compromised internal Outline account cannot see customer workspace content. Outline is also open source and self-hostable via Docker with PostgreSQL, Redis, and S3-compatible storage, letting a team that doesn't trust any vendor's cloud keep the wiki entirely on infrastructure it controls.

## [Document360](https://document360.com/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list)

Document360 has moved to fully custom, quote-based pricing and dropped its previously published per-project tiers, so a size or price expectation from an older review is likely stale. SSO and SCIM are listed among its "industry leading" features, IP restriction is available as a security control, and SOC 2 Type II compliance applies across plans rather than being gated to a top tier. Document360's pricing model is also worth noting on its own: plans are billed per documentation project, so a team running both a public help center and a private internal knowledge base is paying for two separate subscriptions, which changes the real cost of using it purely as an internal wiki.

## How the six compare

| Tool | Entry price | SSO included at | Audit logs | Self-hosting |
|---|---|---|---|---|
| Confluence | Free (10 users) | Enterprise (or +Atlassian Access, ~$4/user/mo) | Enterprise (or with Access) | No (cloud only for SMBs) |
| Notion | Free | Business, $20/user/mo | Enterprise (custom) | No |
| GitBook | Free | Enterprise (custom quote) | Not published | No |
| Guru | Custom quote only | Included in core offering | Included in core offering | No |
| Outline | $10/mo flat (no SSO) | Team, $79/mo | Not published | Yes, self-hosted |
| Document360 | Custom quote only | Available, tier unclear | SOC 2 Type II baseline | No |

## How to choose

If you're a small team that just needs to stop anyone-with-the-link sharing and can live without SSO for now, Outline's Starter or Notion's Plus will cover the basics cheaply, with a clear upgrade path once you need single sign-on. If your organization already runs on Okta or Entra ID and treats SSO as non-negotiable from day one, Notion Business or Outline Team give you that without a sales call. If you're already deep in Jira and Atlassian tooling, Confluence Enterprise is the more coherent choice precisely because it stops charging extra for identity features at that tier. If your legal or security team has a hard requirement that the wiki never leave infrastructure you control, Outline's self-hosted option is the only one on this list that satisfies it outright. And if you'd rather have a security team on the other end of a contract than a settings page, Guru and Document360 both build the conversation into the sales process.

## Verdict

There's no single "most secure" wiki here; there's a match between how your organization actually controls access today and how each vendor prices that control. The mistake to avoid is picking a tool for its editing experience and assuming the security features will be there when you need them. Check whether SSO, SCIM, and audit logs are included at the plan you can actually afford, not just the plan on the marketing page, before a document with real consequences ends up on a wiki nobody can properly lock down.

## Frequently asked questions

### Do I need SSO for a small team wiki?

Not immediately, but it matters as soon as you have contractors or employees who leave. Without SSO tied to your identity provider, deactivating someone's account in Okta or Entra ID does not automatically cut off their wiki access, and manual offboarding gets missed. Budget for it once you're past a handful of users.

### Is a self-hosted wiki actually more secure than a cloud one?

It shifts the responsibility rather than automatically improving it. Self-hosting Outline means you control the infrastructure and nothing leaves your network, but you also own patching, backups, and access hardening yourself. For teams without dedicated security or ops staff, a well-configured cloud vendor with SOC 2 and audit logs can be the safer default.

### What is the actual difference between SSO and SCIM?

SSO controls how someone logs in, routing authentication through your identity provider instead of a separate password. SCIM automates provisioning and deprovisioning, so when someone is added to or removed from your identity provider, their wiki account is created or disabled automatically. SSO without SCIM still leaves manual offboarding as a gap.

### Why do some of these vendors not publish pricing?

Guru and Document360 have both moved to fully custom, sales-quoted pricing rather than published tiers. That usually means the vendor is pricing based on seat count, data volume, or the specific compliance package (HIPAA, GxP, SOC 2 scope) a customer needs, so get a quote early rather than assuming a per-seat number from an older review.

## Sources

- [Notion Pricing](https://www.notion.com/pricing?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — Notion
- [Notion Security & Compliance](https://www.notion.com/security?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — Notion
- [GitBook pricing & plans](https://www.gitbook.com/pricing?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — GitBook
- [Guru Pricing](https://www.getguru.com/pricing?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — Guru
- [Outline Pricing](https://www.getoutline.com/pricing?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — Outline
- [Document360 Pricing](https://document360.com/pricing/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — Document360
- [A complete guide to Confluence pricing in 2026](https://ones.com/blog/confluence-pricing/?utm_source=guides.reviews&utm_medium=referral&utm_campaign=best_list) — ONES.com