Insights

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Gathering insights about Castle

Castle Tech Stack

Castle uses 8 technology products and services including Zendesk, SendGrid, Google Fonts API, and more. Explore Castle's tech stack below.

  • Zendesk
    Documentation Tools
  • SendGrid
    Email Delivery
  • Google Fonts API
    Font Scripts
  • Lucide
    Font Scripts
  • Element UI
    Javascript Frameworks
  • JSON-LD
    Javascript Frameworks
  • Castle
    Security
  • Semantic UI
    Web Frameworks

Media & News

Castle's Email Address Formats

Castle uses at least 1 format(s):
Castle Email FormatsExamplePercentage
First.Last@castle.ioJohn.Doe@castle.io
41%
First@castle.ioJohn@castle.io
9%
First.Last@castle.ioJohn.Doe@castle.io
41%
First@castle.ioJohn@castle.io
9%

Frequently Asked Questions

Where is Castle's headquarters located?

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Castle's main headquarters is located at Brooklyn, New York 11249 United States. The company has employees across 5 continents, including North AmericaEuropeAsia.

What is Castle's stock symbol?

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Castle is a publicly traded company; the company's stock symbol is CCI.

What is Castle's official website and social media links?

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Castle's official website is castle.io and has social profiles on LinkedInCrunchbase.

What is Castle's NAICS code?

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Castle's NAICS code is 5112 - Software Publishers.

How many employees does Castle have currently?

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As of April 2026, Castle has approximately 48 employees across 5 continents, including North AmericaEuropeAsia. Key team members include Vp Of Operations: L. R.Head Of Product & Engineering: A. Z.Head Chef: C. P.. Explore Castle's employee directory with LeadIQ.

What industry does Castle belong to?

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Castle operates in the Software Development industry.

What technology does Castle use?

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Castle's tech stack includes ZendeskSendGridGoogle Fonts APILucideElement UIJSON-LDCastleSemantic UI.

What is Castle's email format?

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Castle's email format typically follows the pattern of First.Last@castle.io. Find more Castle email formats with LeadIQ.

When was Castle founded?

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Castle was founded in 2015.

Castle

Software DevelopmentNew York, United States11-50 Employees

Castle lets you block bad bots, account takeovers, transaction fraud, and spam — all without the hassle of CAPTCHAs.

Section iconCompany Overview

Headquarters
Brooklyn, New York 11249 United States
Website
castle.io
Stock Symbol
CCI
NAICS Code
5112 - Software Publishers
Founded
2015
Employees
11-50

Section iconFunding & Financials

  • $10M$25M

    Castle's revenue is estimated to be in the range of $10M$25M

Section iconFunding & Financials

  • $10M$25M

    Castle's revenue is estimated to be in the range of $10M$25M

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