Fern vs KnowledgeBase: Features, Pricing and User Reviews 2026
Compare features, pricing, reviews, and more to make an informed decision
Fern
Fern generates production-ready SDKs and beautiful API documentation automatically from your OpenAPI specification for multiple programming languages.
KnowledgeBase
KnowledgeBase is an AI-powered knowledge base software that helps teams create help centers and organize information for better customer support.
Fern
Fern generates production-ready SDKs and beautiful API documentation automatically from your OpenAPI specification for multiple programming languages.
KnowledgeBase
KnowledgeBase is an AI-powered knowledge base software that helps teams create help centers and organize information for better customer support.
Fern
Automatic SDK generation in 8+ programming languages
Stripe-style API documentation websites
Direct publishing to package registries
OpenAPI and AsyncAPI support
Interactive API playground with live testing
Custom branding and domain support
Built-in OAuth 2.0 and authentication
Automatic pagination and retry logic
WebSocket and SSE support
Version control with Git
AI-powered search assistant
Open source on GitHub
KnowledgeBase
AI-powered article and content generation
QuickAnswer for instant tailored responses
Unlimited articles and team members
Multiple knowledge bases from one account
Rich text editor with media support
Automatic branding customization
Custom domain and password protection
Analytics and Google Analytics integration
Drag-and-drop content management
24/7 live chat support
Multilingual knowledge base support
Fern
Fern offers separate pricing for SDKs and documentation to fit different team needs.
For SDK generation, there are three tiers available:
Basic Plan ($250/month per SDK): Supports up to 50 endpoints with REST API support, automated publishing, and schema validation. Billed annually.
Pro Plan ($600/month per SDK): Includes up to 150 endpoints, WebSockets, webhooks, dedicated Slack support, and advanced features like pagination and OAuth. Billed annually.
Enterprise Plan (Custom pricing): Offers unlimited endpoints, SDK migration services, enterprise support with SLAs, GitHub issue monitoring, and custom code maintenance.
For documentation, pricing includes:
Basic Plan ($400/month): Stripe-like API reference, API playground, custom domain, and built-in components. Billed annually.
Pro Plan ($1,000/month): Everything in Basic plus custom React components, authenticated docs, role-based access control, and AI search capabilities. Billed annually.
Enterprise Plan (Custom pricing): Includes white-glove content migration, custom integrations, SSO authentication, design services, and enterprise support.
KnowledgeBase
KnowledgeBase offers simple pricing designed for small and medium businesses. There is one plan that includes all features, making it easy to understand what you get.
The Monthly Plan costs $59 per month and includes one knowledge base with unlimited articles and unlimited team members. If you need additional knowledge bases, you can add them for $24.99 each per month.
The Annual Plan costs $49 per month (billed yearly) and saves you 20% compared to monthly billing. Additional knowledge bases cost $21.99 each per month with annual billing.
All plans include AI content features, QuickAnswer, help center customization, analytics, and 24/7 live chat support. A 14-day free trial is available with no credit card required.
Key features in all plans: unlimited articles, unlimited seats, AI content editor, branding customization, QuickAnswer, analytics, custom domain, password protection, and Google Analytics integration.