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Up to 4 tools, same rows for each: what it is, what it really costs, the trap, and how to wire it up. The URL carries your picks — send it to anyone.
LuciaBetter AuthAuth0
Quick read
- Free with no card: Lucia, Better Auth.
| Field | Lucialucia-auth.com | Better Authbetter-auth.com | Auth0auth0.com |
|---|---|---|---|
| What it is | No longer a library. Lucia was deprecated in March 2025 and now exists as a learning resource: a copy-paste auth_session.ts reference implementation plus The Auth Book, a free guide covering sessions, tokens and password handling. The site was last refreshed in July 2026. | Framework-agnostic TypeScript authentication library that runs inside your own app and writes to your own database. Covers email/password, social OAuth, two-factor, organizations, passkeys and API keys through a plugin system. Vercel acquired the project in July 2026; it stays MIT-licensed, self-hosted and community-governed. | Okta-owned customer identity platform with deep enterprise features: SAML and OIDC federation, an extensibility rules engine, anomaly detection, compliance certifications and fine-grained authorization. The free tier covers 25,000 monthly active users. Paid B2C plans are priced by MAU band, starting at 500 users. |
| Category | Auth & user management | Auth & user management | Auth & user management |
| Cost tier | free | free | mixed |
| Pricing | Free · deprecated library, now MIT reference code and a written guide | Free and open source (MIT) · self-hosted, no MAU fees | Free to 25k MAU · Essentials from $35/mo (500 MAU) · Pro from $240/mo |
| Why builders pick it | Read it before choosing any vendor — it is the fastest way to genuinely understand what session auth does, and the single-file implementation is enough for small projects. | No per-MAU bill ever and no vendor holding your user table — auth becomes just another dependency. The plugin system covers most of what you would otherwise pay Clerk or Auth0 for. | Reach for it when a customer's procurement team demands SOC 2, SAML and audit logs, or when you want an identity vendor that enterprise buyers already recognize and trust. |
| Watch out for | Do not install the npm package for new work; it is unmaintained and will not receive security fixes. This is documentation and example code, not a supported dependency. | You own the hard parts: session security, email deliverability, rate limiting and breach response are all yours. Vercel's July 2026 acquisition preserves MIT licensing, but roadmap direction now sits with a hosting vendor. | Brutal cliff: the free plan holds 25k MAU, but the cheapest paid plan is $35/mo for only 500 MAU. Enabling any single paid feature — custom database connections, enterprise MFA — drops your ceiling from 25,000 users to 500. |
| How to wire it up | not logged | npm i better-auth | npm i @auth0/nextjs-auth0 |
| Editor's pick | No | No | No |
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# Tool comparison — Lucia vs Better Auth vs Auth0 Source: Kbaise, a directory of tools that work with Lovable projects. Pick one and tell me why before writing any integration code. ## Lucia (lucia) - URL: https://lucia-auth.com - Category: Auth & user management - Cost: free — Free · deprecated library, now MIT reference code and a written guide - What it is: No longer a library. Lucia was deprecated in March 2025 and now exists as a learning resource: a copy-paste auth_session.ts reference implementation plus The Auth Book, a free guide covering sessions, tokens and password handling. The site was last refreshed in July 2026. - Why builders pick it: Read it before choosing any vendor — it is the fastest way to genuinely understand what session auth does, and the single-file implementation is enough for small projects. - Trap: Do not install the npm package for new work; it is unmaintained and will not receive security fixes. This is documentation and example code, not a supported dependency. - Full dossier: /api/public/tools/lucia ## Better Auth (better-auth) - URL: https://better-auth.com - Category: Auth & user management - Cost: free — Free and open source (MIT) · self-hosted, no MAU fees - What it is: Framework-agnostic TypeScript authentication library that runs inside your own app and writes to your own database. Covers email/password, social OAuth, two-factor, organizations, passkeys and API keys through a plugin system. Vercel acquired the project in July 2026; it stays MIT-licensed, self-hosted and community-governed. - Why builders pick it: No per-MAU bill ever and no vendor holding your user table — auth becomes just another dependency. The plugin system covers most of what you would otherwise pay Clerk or Auth0 for. - Trap: You own the hard parts: session security, email deliverability, rate limiting and breach response are all yours. Vercel's July 2026 acquisition preserves MIT licensing, but roadmap direction now sits with a hosting vendor. - Wiring: npm i better-auth - Full dossier: /api/public/tools/better-auth ## Auth0 (auth0) - URL: https://auth0.com - Category: Auth & user management - Cost: mixed — Free to 25k MAU · Essentials from $35/mo (500 MAU) · Pro from $240/mo - What it is: Okta-owned customer identity platform with deep enterprise features: SAML and OIDC federation, an extensibility rules engine, anomaly detection, compliance certifications and fine-grained authorization. The free tier covers 25,000 monthly active users. Paid B2C plans are priced by MAU band, starting at 500 users. - Why builders pick it: Reach for it when a customer's procurement team demands SOC 2, SAML and audit logs, or when you want an identity vendor that enterprise buyers already recognize and trust. - Trap: Brutal cliff: the free plan holds 25k MAU, but the cheapest paid plan is $35/mo for only 500 MAU. Enabling any single paid feature — custom database connections, enterprise MFA — drops your ceiling from 25,000 users to 500. - Wiring: npm i @auth0/nextjs-auth0 - Full dossier: /api/public/tools/auth0 ## Quick read - Free with no card: Lucia, Better Auth. ## Rules 1. Prefer the free tier when no budget was stated, and say what the ceiling is. 2. Read the full dossier before integrating. 3. Fetch /api/public/models before writing any AI model ID.
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