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Kastra

Control what your AI is allowed to do. Sub-millisecond authorization for every prompt, tool call, shell command, and API request.

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Overview

Control what your AI is allowed to do. Sub-millisecond authorization for every prompt, tool call, shell command, and API request.

AI summary

Kastra serves as an authorization layer for AI systems, determining what agents, models, and AI tools can do prior to execution. It emphasizes sub-millisecond policy decisions and cryptographic audit trails, promoting a zero implicit trust approach.

Who Is It For

Best for

Organizations seeking to implement strict authorization controls for their AI systems and requiring rapid policy decision-making.

Not for

Small businesses or individual developers who may not have complex AI authorization needs.

Strengths & Weaknesses

Biggest strength

The ability to provide sub-millisecond authorization for various AI interactions, enhancing security and control.

Biggest weakness

Lack of visible pricing information and no detected free plans or trials, which may limit accessibility for potential users. (AI-inferred; may be outdated – founders can correct this)

Classification

Likely competitors
Auth0OktaAWS Identity and Access ManagementAzure Active Directory

Alternatives to Kastra

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How we sourced this: Observed fields () were crawled from https://kastra.ai/ and are stated as fact. AI-inferred fields () were generated by gpt-4o-mini and are always labelled – never presented as measured fact. Last updated: 23 July 2026. Is this your tool? Claim it to edit and get a do-follow badge.