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  1. Home
  2. Alternatives
  3. Alternatives to Kastra
Kastra logo

Best Alternatives to Kastra

Auth · 8 alternatives ranked of 19 in the category

Looking for alternatives to Kastra? These are the auth tools that score highest on adoption, reviews, benchmarks, and public code, with what separates each one from Kastra.

Better Auth logo
Better Auth

Auth· better-auth.com

Open source

Open-source TypeScript authentication framework for modern apps.

30,381
Open source

How each alternative differs from Kastra

Ranked by adoption, review, benchmark, and repository signals. Each note below is drawn from the two products’ own catalog records, so a product with nothing to separate it from Kastra carries no note.

  1. 1

    Better Auth

    Better Auth is listed as open source, while Kastra is not, is open source against Kastra's freemium model, and has a public repository with 30k stars.

  2. 2

    Destructive Command Guard

    Destructive Command Guard is listed as open source, while Kastra is not, is open source against Kastra's freemium model, and has a public repository with 6.2k stars.

  3. 3

    OneCLI

    OneCLI is listed as open source, while Kastra is not, is free against Kastra's freemium model, and has a public repository with 3.6k stars.

  4. 4

    Open Connector

    Open Connector is listed as open source, while Kastra is not, is open source against Kastra's freemium model, and has a public repository with 6.0k stars.

  5. 5

    Unkey

    Unkey is listed as open source, while Kastra is not and has a public repository with 5.5k stars.

Frequently asked questions

What is the closest alternative to Kastra?

Better Auth ranks highest among the alternatives to Kastra we track. Better Auth is listed as open source, while Kastra is not, is open source against Kastra's freemium model, and has a public repository with 30k stars. Open-source TypeScript authentication framework for modern apps.

Is there an open-source alternative to Kastra?

Yes. Better Auth, Destructive Command Guard, OneCLI, Open Connector, Unkey, Brain0, and Tandem are listed as open source in our catalog. Kastra is not listed as open source. Better Auth is the highest ranked of them: Open-source TypeScript authentication framework for modern apps.

Destructive Command Guard logo
Destructive Command Guard

Auth· github.com

Open source

High-performance hook that blocks destructive Git and shell commands before AI coding agents can execute them.

6,180
Open source
OneCLI logo
OneCLI

Auth· onecli.sh

Free

Open-source credential gateway and encrypted vault that injects scoped API credentials into AI-agent requests without exposing raw secrets.

3,580
Open source
Open Connector logo
Open Connector

Auth· oomol.com

Open source

Open-source authentication gateway connecting AI agents to SaaS providers through SDK, CLI, MCP, HTTP, and OpenAPI interfaces.

6,026
Open source
Unkey logo
Unkey

Auth· unkey.com

Freemium

Developer platform for shipping APIs with API key issuance, verification, rate limiting, and usage analytics behind a global gateway.

5,471
Open source
Clerk logo
Clerk

Auth· clerk.com

Freemium

Authentication, user management, organizations, and session handling for modern apps.

1,767
API available
Brain0 logo
Brain0

Auth· github.com

Open source

Local-first provenance and decision graph for AI-written code, linking commits to agent prompts with drift, DLP, memory, and signed attestations.

322
Open source
Tandem logo
Tandem

Auth· tandem.ac

Freemium

Runtime authority layer for AI agents that scopes tools, data, memory, approvals, tenant boundaries, and auditable actions across MCP workflows.

123
Open source
  • 6

    Clerk

    Clerk has a public repository with 1.8k stars.

  • 7

    Brain0

    Brain0 is listed as open source, while Kastra is not, is open source against Kastra's freemium model, and has a public repository with 322 stars.

  • 8

    Tandem

    Tandem is listed as open source, while Kastra is not and has a public repository with 123 stars.