Insights

Market Expansion Potential Castle's focus on cybersecurity solutions for online businesses positions it well to target rapidly growing e-commerce and SaaS companies seeking advanced fraud prevention and bot mitigation services, especially as digital commerce continues to expand.

Technology Integration Opportunities With Castle's reliance on popular tech stacks like Zendesk, SendGrid, and Google Fonts API, there is a strong opportunity to collaborate with companies that provide complementary software solutions for customer engagement, communication, and web development.

Mid-Market Growth Castle operates within the $10 million to $25 million revenue range, indicating potential for mid-market companies looking to scale their security infrastructure; targeted outreach can facilitate upselling or expanding existing client relationships.

Industry Synergies Given Castle's industry focus on software development and the listed competitive landscape, there are prospects to partner with or differentiate from similar firms serving online platforms, marketplaces, and digital service providers seeking robust security solutions.

Customer Engagement Strategies Castle's emphasis on providing seamless security without CAPTCHAs offers a compelling value proposition for customer-centric businesses, highlighting opportunities to develop sales pitches focused on enhancing user experience alongside security, which appeals to companies prioritizing high conversion rates.

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
42%
First@castle.ioJohn@castle.io
8%
First.Last@castle.ioJohn.Doe@castle.io
42%
First@castle.ioJohn@castle.io
8%

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 March 2026, Castle has approximately 47 employees across 5 continents, including North AmericaEuropeAsia. Key team members include Ceo & Co-Founder: J. B.Vp Of Operations: L. R.Head Of Product & Engineering: A. Z.. 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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