YC active company list audit

Castle.io

Castle.io: Block bots & bad behavior. Headquartered in San Francisco, CA, United States. Current operating status: active.

Oomira checked this YC company record against source evidence and keeps the current facts, observed dates, and provenance visible before the interactive app loads.

18 facts3 sources2 superseded claims

What changed in the audit

external name

Castle.io -> Castle
2026-06-12 · yc-oss record id 1032: field "former_names" includes "Castle.io"

external name

Castle Intelligence -> Castle
2026-06-12 · yc-oss record id 1032: field "former_names" includes "Castle Intelligence"

Summary: Block bots & bad behavior
Description: Instantly stop automated and human-originated account takeovers, fake accounts, and any behavior that violates your platform policies.
Website: https://castle.io
Hiring: yes
Headquarters: San Francisco, CA, United States
Operating status: active
Industry: B2B

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