Better Auth leads in popularity with 29,515 stars vs 14,700 stars for Zitadel. The 101% higher star count indicates stronger community adoption. In terms of developer contributions, Better Auth has 2,790 forks, indicating strong developer engagement.

Zitadel is growing faster, adding 309 stars in the last 30 days (+2.1%) against adding 374 stars for Better Auth (+1.3%). Zitadel is the smaller project of the two, so it is closing the gap rather than extending a lead.

Both projects show recent activity, with Better Auth last updated 1 hour ago and Zitadel 3 hours ago.

Both tools share common technology foundations, being built with JavaScript, CSS, Typescript, JSX, Next.js. However, they differ in their additional technology choices: Better Auth uses Vue, SvelteKit, Nuxt.js, Remix, Tanstack Start while Zitadel leverages Bash, SCSS, Golang, Lua.

Zitadel has been in development longer, starting 6 years ago, compared to Better Auth which began 2 years ago. This 4.2-year head start suggests Zitadel may have more mature features and established processes.

Better Auth uses the MIT license, which is more permissive than Zitadel's AGPL-3.0 license, potentially offering greater flexibility for commercial use and integration.

Both tools serve similar use cases in Authentication & SSO. However, they also have distinct specializations: Better Auth also focuses on Identity & Access Management (IAM) while Zitadel extends into Authorization & Permissions.

Zitadel provides self-hosting options for complete data control and customization, while Better Auth may be primarily cloud-based or require different deployment approaches.