Castle
Castle

Castle

Developer-grade infrastructure to stop bots, abuse, and fraud by transforming user behavior into real-time signals.

2015Active52San Francisco, United States

Check the tech stack behind castle.io. Find a founder email at castle.io.

About

Castle provides developer-grade infrastructure designed to combat bots, abuse, and fraud. By analyzing user behavior to generate real-time signals, it enhances security for companies like Canva, Rockstar Games, and Atlassian. Their mission is to establish the internet's missing trust layer, scaling through... Teams look it up for Cybersecurity, Threat Detection, Authentication.

Frequently asked

What does Castle do?

Castle is a Cybersecurity company that offers Software. Teams look it up for Threat Detection, Authentication, API Platform. It is based in San Francisco, United States and was founded in 2015. Public records show about 52 people and $9M raised. Compare it on funding, headcount, reviews and nearby alternatives rather than the marketing line alone.

How much funding has Castle raised?

Castle has raised a total of $9M in funding. The most recent round on record is Series A.

Where is Castle headquartered?

Castle is headquartered in San Francisco, United States.

When was Castle founded?

Castle was founded in 2015.

What industry does Castle operate in?

Castle operates in Cybersecurity, Threat Detection, Authentication, API Platform, Developer Tools.

How many employees does Castle have?

Castle has approximately 52 people on record.

Scores
Measured, not editorial
Ahrefs DR
66/100

Strength of the site’s backlink profile, on Ahrefs’ 0-100 Domain Rating scale. Licensed third-party data, not our opinion.

Agent Readiness
49/100

How well an AI agent can read and use this site: structured data, clean markup, and whether key facts are reachable without running JavaScript. We scan the live site.

Site Speed
47/100

Google PageSpeed mobile performance for the company’s own site. Measured by Google, not by us.

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