Insights

Digital trust edge Callsign specializes in digital trust and AI-based user recognition with high accuracy, offering privacy, safety, and low friction. This positions them well for upsell to organizations prioritizing secure onboarding, identity verification, and fraud prevention across fintech, e-commerce, and enterprise apps.

Strategic partnerships Recent and notable partnerships with StateTalking and Visa indicate active go‑to‑market momentum through channels that expand adoption in education, financial services, and cross‑industry security initiatives. This creates opportunities to target institutions and fintech firms seeking alliance partners and integrated solutions.

Leadership and recognition Being recognized as a Leader in Product Vitals by Javelin Strategy & Research and a Representative Vendor signals credibility with buyers and analysts. Leverage this for competitive differentiation in RFPs, case studies, and executive briefings to accelerate procurement cycles.

Growth through scale-minded peers Comparable companies in the security and identity space show mid‑size peers with similar revenue bands and teams. Callsign can pursue mid‑market and enterprise opportunities by highlighting scalable identity proofing and real‑world presence with optical user recognition as a service for onboarding, compliance, and fraud reduction.

Global reach via pro bono & ecosystems Pro bono partnerships and a broad tech stack indicate a symbiotic ecosystem approach. Target organizations with strong corporate social responsibility programs, nonprofit and education sectors, and global partners looking to enhance digital trust while expanding their social impact.

Callsign Tech Stack

Callsign uses 8 technology products and services including Grafana, Continuous Delivery, XML, and more. Explore Callsign's tech stack below.

  • Grafana
    Analytics
  • Continuous Delivery
    Continuous Integration
  • XML
    Data Management
  • PWA
    Miscellaneous
  • Office 365
    Office Suites
  • Hadoop
    Programming Languages
  • iOS
    Programming Languages
  • Google Tag Manager
    Tag Management

Media & News

Callsign's Email Address Formats

Callsign uses at least 1 format(s):
Callsign Email FormatsExamplePercentage
First.Last@callsign.comJohn.Doe@callsign.com
96%
First.Middle@callsign.comJohn.Michael@callsign.com
3%
First@callsign.comJohn@callsign.com
1%

Frequently Asked Questions

What is Callsign's phone number?

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You can contact Callsign's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

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

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Callsign's official website is callsign.com and has social profiles on LinkedInCrunchbase.

How much revenue does Callsign generate?

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As of July 2026, Callsign's annual revenue is estimated to be $25M - $50M.

What is Callsign's NAICS code?

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Callsign's NAICS code is 5415 - Computer Systems Design and Related Services.

How many employees does Callsign have currently?

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As of July 2026, Callsign has approximately 272 employees across 4 continents, including EuropeAsiaNorth America. Key team members include Chief Information Officer: A. P.Chief Revenue Officer: S. O.Chief Security Officer: I. C. C.. Explore Callsign's employee directory with LeadIQ.

What industry does Callsign belong to?

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Callsign operates in the Computer and Network Security industry.

What technology does Callsign use?

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Callsign's tech stack includes GrafanaContinuous DeliveryXMLPWAOffice 365HadoopiOSGoogle Tag Manager.

What is Callsign's email format?

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Callsign's email format typically follows the pattern of First.Last@callsign.com. Find more Callsign email formats with LeadIQ.

How much funding has Callsign raised to date?

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As of July 2026, Callsign has raised $39M in funding. The last funding round occurred on Apr 27, 2021.

When was Callsign founded?

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Callsign was founded in 2011.
Callsign logo

Callsign

Computer and Network SecurityEngland, United Kingdom201-500 Employees

Callsign is a London, England, United Kingdom-based company in the computer and network security industry, employing between 201 and 500 people. It develops digital-trust solutions that mimic human identification to distinguish genuine users, aiming to provide privacy and security with minimal friction while blocking bad actors. The company reports that its user recognition can reach up to 99.999% accuracy. It has formed partnerships with Visa in 2023 and with State Talking in 2026, and was named a Leader in Product Vitals in Javelin Strategy & Research's 2024 Authentication and Identity-Proofing Vendor Solutions Scorecard. Reported revenue is in the range of $25 million to $50 million, and its technology stack includes Zipkin, Continuous Delivery, XML, DocuSign, Microsoft Office, Ruby, Scala, and Google Tag Manager.

Section iconCompany Overview

Phone number
NAICS Code
5415 - Computer Systems Design and Related Services
Founded
2011
Employees
201-500

Section iconFunding & Financials

  • $39M

    Callsign has raised a total of $39M of funding over 6 rounds. Their latest funding round was raised on Apr 27, 2021as a series_unknown.

  • $25M - $50M

    Callsign's revenue is estimated to be in the range of $25M - $50M

Section iconFunding & Financials

  • $39M

    Callsign has raised a total of $39M of funding over 6 rounds. Their latest funding round was raised on Apr 27, 2021as a series_unknown.

  • $25M - $50M

    Callsign's revenue is estimated to be in the range of $25M - $50M

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