Developer decision Enterprise evaluation

Better Auth vs Kastra

Side-by-side comparison of Better Auth and Kastra across fit, pricing, docs, evidence gaps, and benchmarks.

Decision brief

Best overall

Better Auth

Best combined signal across API availability, docs, adoption, reviews, and ecosystem proof.

Open-source option

Better Auth

Start here when local control, inspectability, or self-hosting matters.

Decision notes

Adoption proof: No verified adoption proof yet

Reviews: No developer reviews yet

Repo stars: Better Auth

Check before choosing

Better Auth has no developer reviews yet.Better Auth has no public adoption proof yet.Kastra has no developer reviews yet.Kastra has no public adoption proof yet.

Evidence links

Better Auth docs Better Auth repo Kastra docs

Missing evidence and weekly return

Better Auth: verified adoptionBetter Auth: benchmark dataKastra: repoKastra: verified adoptionKastra: benchmark data

Save this comparison to watch rank movement, new alternatives, docs changes, examples, and benchmark updates.

Next stepBuild packet and draft write-up

Turn this Better Auth vs Kastra decision into something you can build from.

Most developers reading a head-to-head are picking what to ship this week. Take the Better Auth vs Kastra decision into a build packet with the setup steps for whichever one you choose, and draft a short write-up of how it went so the next person deciding this has something concrete to read.

Comparing Better Auth vs Kastra

Better Auth docs Better Auth GitHub Kastra docs Kastra site

Build packet Draft proof page

Feature Comparison

Better Auth

Auth

Pricing: Open source
Open source: Yes
API: Available
Rating: No reviews
GitHub: 30,381 stars
Adoption: Public evidence pending
Benchmark: No benchmark data
Best for: Open-source TypeScript authentication framework for modern apps.
Tradeoff: More control and inspectability, but more setup and operational ownership.

Kastra

Auth

Pricing: Freemium
Open source: No
API: Available
Rating: No reviews
GitHub: No public repo
Adoption: Public evidence pending
Benchmark: No benchmark data
Best for: Runtime authorization layer for AI agents that enforces tool, prompt, input, and output po
Tradeoff: Faster managed path, but higher vendor dependency and pricing review.

Feature	Better Auth	Kastra
Category	Auth	Auth
Pricing	Open source	Freemium
Open source
API available
Rating	No reviews	No reviews
GitHub stars	30,381	No public repo
Adoption	Public evidence pending	Public evidence pending
Benchmark	No benchmark data	No benchmark data
Best for	Open-source TypeScript authentication framework for modern apps.	Runtime authorization layer for AI agents that enforces tool, prompt, input, and output po
Developer tradeoff	More control and inspectability, but more setup and operational ownership.	Faster managed path, but higher vendor dependency and pricing review.

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Feature

Better Auth

Kastra