Authelia vs Clerk
Side-by-side comparison of features, pricing, ratings, and alternatives.
Authelia is an open-source authentication server that provides Single Sign-On (SSO) and Multi-Factor Authentication (MFA) for web applications. It is designed to be highly customizable and scalable, making it suitable for a wide range of use cases.
Clerk provides a complete authentication and user management solution that lets developers add sign‑in, sign‑up, and profile flows with just a few lines of code. Its prebuilt UI components are customizable and work out‑of‑the‑box, reducing the time spent building secure login experiences. The platform also offers a robust API and SDKs for popular front‑end frameworks, enabling seamless integration with existing applications while handling security, session management, and user data storage for you.
- Highly customizable and scalable
- Supports OpenID Connect (OIDC) and OAuth 2.0 protocols
- Provides Single Sign-On (SSO) and Multi-Factor Authentication (MFA)
- Open-source and free to use
- Fast integration with prebuilt components
- Supports many social and passwordless providers
- Strong security defaults and session handling
- Generous free tier for early projects
- Requires technical expertise to set up and configure
- Limited documentation and community support
- May require additional infrastructure to support large-scale deployments
- Limited self‑hosting options – SaaS only
- Pricing can rise for high‑volume usage
- Custom UI tweaks may require deeper CSS work
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The Verdict
AI-generated from listing dataAuthelia offers a free, self‑hosted, highly customizable SSO/MFA solution requiring technical setup, while Clerk provides a fast‑to‑integrate SaaS UI‑centric auth with generous free tier but limited self‑hosting.
Key differences
- •Deployment model: Authelia is self‑hosted open source; Clerk is cloud‑only SaaS.
- •Integration focus: Authelia centers on OIDC/OAuth protocols; Clerk ships prebuilt UI components for React/Next.js ecosystems.
- •Pricing: Authelia is free; Clerk uses a freemium model that can become costly at scale.
- •Customization vs convenience: Authelia requires deep technical work for custom flows; Clerk offers instant sign‑in components with limited UI tweaks.
Pricing & value
Authelia is free open source; Clerk charges beyond its generous free tier.
Ease of use / learning curve
Clerk provides ready‑made UI components and SaaS setup; Authelia needs self‑hosting and configuration expertise.
Features & depth
Authelia supports full SSO, MFA, multi‑tenancy, and protocol customization; Clerk focuses on UI and basic auth flows.
Integrations & ecosystem
Clerk lists direct integrations with Next.js, React, Remix, Vercel, Netlify; Authelia only lists OIDC/OAuth protocols.
Support
Clerk offers email, live chat, and community forum; Authelia limited to email and GitHub issues.
Scalability
Authelia’s self‑hosted architecture is described as scalable for large deployments; Clerk’s SaaS may hit cost limits.
Security & privacy
Both provide MFA and OAuth/OIDC security; no data on privacy differences provided.
Choose Authelia if…
Teams needing full control, on‑prem deployment, and unlimited free usage.
Choose Clerk if…
Product teams wanting quick UI auth integration with minimal setup.
Common questions
Can I host Clerk on my own infrastructure?
No, Clerk is SaaS‑only with limited self‑hosting options.
What is the cost if my user base grows beyond the free tier?
Clerk uses a freemium model; pricing can increase for high‑volume usage, while Authelia remains free.
Do both solutions support standard protocols like OpenID Connect?
Yes, Authelia explicitly supports OIDC/OAuth 2.0; Clerk supports these indirectly via its SDKs but focuses on UI components.