kitio.aiGitBook vs SigmaOS
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. GitBook starts at $65/mo and SigmaOS starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- GitBook Agent for editing docs
- Embeddable AI assistant
- AI search answers
- Auto-updating translations
- Custom domains and analytics
- Workspaces
- Vertical tabs
- Tabs as tasks
- Split screen
- Lazy Search
- Airis AI companion
| Feature | GitBook | SigmaOS |
|---|---|---|
| Best for | Docs platform with an AI agent for writers and an AI assistant for readers | Mac browser with workspaces, tabs as tasks and an AI companion |
| Category | Productivity | Productivity |
| Pricing model | Freemium | Freemium |
| Starting price | $65/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | GitBook | SigmaOS |
| Based in | – | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
GitBook starts at $65/mo and SigmaOS starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Free
Free
- Public branded docs site
- 1 user
- GitBook Agent, 10 messages a week
Essential
$65/mo
- Per site
- $20 of AI credits included
- AI Assistant Ask
- Custom domain and analytics
Ultimate
$249/mo
- Per site
- $100 of AI credits included
- AI Assistant Chat
Enterprise
Contact sales
- SAML SSO
- White-glove migration
- Dedicated support
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
GitBook
- AI help for both writers and readers
- Translations update with the source
- Free plan for public docs
- AI features consume paid credits
- Each extra user costs $12 a month
- Full Assistant chat only on Ultimate
SigmaOS
- Free to download
- Clear tab organization by workspace
- AI answers in the page context
- Mac only
- Takes getting used to after Chrome
- Pricing for extras not shown
Which one should you choose?
Choose GitBook if you want:
- AI help for both writers and readers
- Translations update with the source
- Free plan for public docs
Watch out: ai features consume paid credits.
Choose SigmaOS if you want:
- Free to download
- Clear tab organization by workspace
- AI answers in the page context
Watch out: mac only.
GitBook vs SigmaOS FAQ
What is the difference between GitBook and SigmaOS?
GitBook: Docs platform with an AI agent for writers and an AI assistant for readers. SigmaOS: Mac browser with workspaces, tabs as tasks and an AI companion. Both are productivity tools.
Is GitBook or SigmaOS cheaper?
GitBook starts at $65/mo and SigmaOS starts at See pricing page. Check both pricing pages for current plans.
Do GitBook and SigmaOS have free plans?
GitBook: Yes. SigmaOS: Yes.
Who makes GitBook?
GitBook is made by GitBook.
Who makes SigmaOS?
SigmaOS is made by SigmaOS, based in United States.
Which should I choose, GitBook or SigmaOS?
Choose GitBook if you value ai help for both writers and readers and translations update with the source. Choose SigmaOS if you value free to download and clear tab organization by workspace.