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Castle (YC W16) — Block bots & bad behavior

Castle appears in Y Combinator's company directory in the Winter 2016 batch, listed 2015-11-15. Block bots & bad behavior.

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Castle: Accepted into Y Combinator Winter 2016

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Castle

New accelerator entry · 2015-11-15 · the record

Winter 2016
batch
20
people
Growth
stage
United States of America
region
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In their words

Instantly stop automated and human-originated account takeovers, fake accounts, and any behavior that violates your platform policies.

What the record says

BatchWinter 2016
Announced2015-11-15
StageGrowth
StatusActive
Team size20
IndustryB2B
Sub-industryB2B -> Security
SectorsDeveloper Tools, SaaS, Security, Fraud Detection
RegionsUnited States of America, America / Canada, Remote, Fully Remote
BasedSan Francisco, CA, USA; Remote
HiringYes
Sitehttps://castle.io
Previously known asCastle.io, Castle, Castle Intelligence

The full profile

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If you're behind Castle: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. FoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.

Sourced from the company's Y Combinator directory entry.

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Cite this page

Permanent URL: https://mentionfox.com/funding/yc-castle-2
Last updated 2026-09-26
Primary record: Y Combinator directory entry
Castle (YC W16) — Block bots & bad behavior. MentionFox, 2026-09-26. https://mentionfox.com/funding/yc-castle-2