About Castle
Castle is a Technology company based in San Francisco (United States) founded in 2015. Castle is focused on stopping bots and account abuse. It operates on a SaaS (Software-as-a-Service) and Pay-per-Use / Usage-Based model in Technology, Media & Entertainment, and Industrial Goods & Manufacturing sectors. Castle has raised $13.72 million across 3 funding rounds from investors including Index Ventures, Y Combinator and First Round Capital. The company has 21 employees. Its website castle.io draws about 75 thousand monthly visits. Castle offers products and services including Castle Platform, Device Fingerprinting, and Bot Detection. Its focus areas include Cybersecurity and Fraud Prevention. Its competitors include Riskified and Integral Ad Science; 2 of its 2 listed competitors have raised funding.
Company details
Castle is engaged in providing advanced fraud detection and prevention solutions. The company operates in the cybersecurity sector, offering a comprehensive platform to stop bots and account abuse. Solutions are built to run at the edge and in-app, ensuring dual-layer fraud defense. Various use cases such as fake accounts, account takeovers, and transaction abuse are addressed through behavioral analysis, device fingerprinting, and AI scoring. Tools and APIs are provided to eliminate the need for multiple disconnected systems, enabling real-time protection and analytics for evolving abuse trends.
- Total Equity Funding$13.72M (USD)
in 3 rounds
- Latest Funding Round$11.72M (USD), Series A
Feb 2019
- InvestorsIndex Ventures
& 7 more
- Employee Count21
Products & Services of Castle
Castle offers a comprehensive portfolio of products and services, including Castle Platform, Device Fingerprinting, and Bot Detection.
Fraud and abuse are stopped using advanced technology.
Devices are identified with high accuracy for security.
Bots and scripts are detected to prevent abuse.
Funding Insights of Castle
Castle has successfully raised a total of $13.72M across 3 strategic funding rounds. The most recent funding activity was a Series A round of $11.72 million completed in February 2019. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $13.72M
- Total Rounds 3
- Last Round Series A — $11.72M
- Investors Count 8
All 3 funding rounds of Castle with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Feb 2019 | $11.72M | Series A | – | Index Ventures | |
| Nov 2016 | $2M | Seed | – | First Round Capital | |
| Mar 2016 | Seed | – | Y Combinator | – |
8 investors in total: 5 institutional and 3 angel.
Investors in Castle
Castle has secured backing from 8 investors, including venture fund and angel investors. Prominent investors backing the company include Index Ventures, Y Combinator and First Round Capital.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Venture capital investments in technology startups and entrepreneurs. | indexventures.com | |||
Early-stage startups are accelerated via funding and educational programs. | ycombinator.com | Mountain View, United States | ||
US focused seed and early-stage VC firm | firstround.com | San Francisco, United States | ||
Investments in life sciences, technology, healthtech, and crypto sectors from global locations. | fprimecapital.com | |||
Venture capital firm focused on seed and series investments | fcvc.com | |||
ZU Zack Urlocker | Angel investor, ex-COO of Duo Security, advisor to startups | unknown_eb777de473e54ad59 | ||
RB René Bonvanie | unknown_126b302423e6414e8 | |||
OP Olivier Pomel | Co-founder & CEO of Datadog, active angel investor in tech startups | unknown_83656ace59854fa39 |
Investor details for Castle
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People of Castle
8 people are tracked at Castle (4 in leadership, 4 in team); the tracked headcount is 21.
| Name | Role | Group |
|---|---|---|
Adam Zima | Head Of Product & Engineering | Leadership |
Johan Brissmyr | CEO & co-Founder | Leadership |
Sebastian Wallin | Co-founder & CTO | Leadership |
Lisa Rydje | Head Of Operations | Leadership |
Andre Loureiro | Software Developer | Team |
Rafał Malinowski | Staff Software Engineer | Team |
Bartosz Knapik | Senior Software Engineer | Team |
Ashleigh Coates | Senior Manager Business Operations | Team |
Complete people profiles for Castle
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Timeline of Castle
3 dated milestones of Castle across 4 years, from founding to its latest funding, stage changes and deals.
- Founded Castle is founded.
- Funding First funding round.
- Funding Latest funding round, Series A, of $11.7M.
Competitors of Castle
Castle has 2 listed competitors in our database, 2 of them funded. They include Riskified and Integral Ad Science.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| riskified.com | 2013 | New York, United States | $232.02M | 781 | AI-based fraud prevention for e-commerce payments is provided. | |
| integralads.com | 2009 | New York, United States | $80.75M | 880 | AI powered ad fraud detection software |
Detailed competitors of Castle
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Web traffic of Castle
The website of Castle (castle.io) receives about 75K visits a month.
- Monthly visits75K
▲ 22% vs previous month
Websites whose visitors overlap most with Castle. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
castleapps.org | castleapps.org | 100% | – | ||
castleap.com | castleap.com | 96% | – | ||
antbrowser.pro | antbrowser.pro | 96% | #3,556,132 | – | |
| hidemyacc.com | 96% | #351,717 | View details | ||
ixbrowser.com | ixbrowser.com | 96% | #338,558 | – | |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 27 similar websites and full traffic analytics for Castle
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- 27 similar websites
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Top companies in AI Core Platforms & Infrastructure
3 companies that operate in the same segment as Castle (AI Core Platforms & Infrastructure) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
OpenAI is engaged in developing advanced artificial intelligence technologies. | 2015 | San Francisco, California, United States | USD 58.07 B | 11,115 | ||
AI-powered graphical processing units and SoCs | 1993 | Santa Clara, California, United States | USD 5 M | USD 130.5 B | 42,000 | |
AI models and chatbots are offered for industry applications. | 2021 | San Francisco, California, United States | USD 136.81 B | 6,146 |
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Related news about Castle
Complete news archive for Castle
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Frequently Asked Questions about Castle
Castle was founded in 2015 and raised its 1st funding round 1 year after it was founded.
Castle is headquartered in San Francisco, United States. It is registered at San Francisco, California, United States.
Castle is a funded company, having raised a total of $13.72M across 3 funding rounds to date.
Castle has 21 employees.
Castle is engaged in providing advanced fraud detection and prevention solutions. The company operates in the cybersecurity sector, offering a comprehensive platform to stop bots and account abuse. Solutions are built to run at the edge and in-app, ensuring dual-layer fraud defense. Various use cases such as fake accounts, account takeovers, and transaction abuse are addressed through behavioral analysis, device fingerprinting, and AI scoring. Tools and APIs are provided to eliminate the need for multiple disconnected systems, enabling real-time protection and analytics for evolving abuse trends.
Castle's top competitors include Riskified and Integral Ad Science.
Castle offers Castle Platform, Device Fingerprinting, and Bot Detection.
Castle has 8 investors. Key investors include Index Ventures, Y Combinator, First Round Capital, F-Prime Capital, and Zack Urlocker.