Best Cybersecurity & Digital Defense in San Francisco
6 cybersecurity firms serving the San Francisco, California area, ranked by tier and rating.
- Verified providers
- 5 verified / 6 listed
- Last updated
- Last updated September 2026
Ranked listings
Top Cybersecurity & Digital Defense in San Francisco, CA
Ranked by tier and rating. Every listing is human vetted before it appears here.
How we rank
Providers are hand-vetted by our editorial team based on verified client history, domain authority, and AI footprint. Rankings within San Francisco are then ordered by tier, verification status, rating, and review count — never by pay-to-rank.
OpenDNS
OpenDNS is the predecessor to Cisco Umbrella, a cloud-delivered security service centered on DNS and enterprise network protection. OpenDNS developed a cloud platform that provided threat protection and security enforcement for devices connecting to internet resources. Cisco announced plans to acquire the San Francisco-based company in June 2015 and completed the acquisition in August 2015. Cisco said the acquisition added cloud-delivered threat intelligence, visibility and enforcement capabilities to its security portfolio. The OpenDNS technology subsequently became part of Cisco's Umbrella security offering, and Cisco's current Umbrella website explicitly identifies OpenDNS as now being Umbrella. Current Umbrella capabilities include recursive DNS services, DNS-layer security, cloud security services and secure internet gateway packages. David Ulevitch is publicly documented as the founder and former CEO of OpenDNS. The original OpenDNS name therefore represents the company and technology lineage behind today's Cisco Umbrella service rather than a separate current vendor.
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Okta
Okta is an identity and access management company founded in 2009 by Todd McKinnon and Frederic Kerrest. The company develops identity security products for employees, customers, partners, non-human identities and AI agents. Its workforce identity capabilities include single sign-on, adaptive multi-factor authentication, device access, API access management, Universal Directory and secure partner access. Okta also provides privileged access management, identity governance, lifecycle management, identity security posture management and identity threat protection. Customer identity services are provided through Okta Customer Identity and the Auth0 platform. Okta describes its platform as neutral and extensible, allowing organizations to connect identity controls with a broad range of applications and technologies. The company has expanded its identity security work to address AI agents and other machine identities as organizations adopt new forms of automated software. Okta's own company history confirms that McKinnon and Kerrest created the company in 2009 around Identity-as-a-Service.
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Okta
Okta is the leading independent identity and access management platform, providing zero trust identity solutions including single sign-on, multi-factor authentication, and lifecycle management for over 19,000 organisations. The NASDAQ-listed company powers secure access for employees, customers, and partners at companies including JetBlue, Nordstrom, and T-Mobile.
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Cloudflare Zero Trust
Cloudflare Zero Trust replaces legacy VPNs and firewalls with a global edge network that verifies every user, device, and application request. Part of the Cloudflare connectivity cloud serving 20% of all websites, the zero trust platform provides secure access, DNS filtering, browser isolation, and data loss prevention for organisations of all sizes.
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Transcend
Transcend is a data privacy infrastructure company providing automated data subject request fulfillment, consent management, and data mapping across an organisations entire tech stack.
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HackerOne AI Red Teaming
HackerOne provides AI red teaming services combining expert human researchers with agentic testing tools to evaluate AI systems for jailbreaks, prompt injection, misalignment, and policy violations. Based in San Francisco, the platform delivers validated findings mapped to OWASP LLM Top 10, MITRE ATLAS, and NIST AI RMF frameworks with prioritized remediation recommendations.
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Frequently asked
About Cybersecurity & Digital Defense in San Francisco
What is the top-rated Cybersecurity & Digital Defense in San Francisco?
OpenDNS currently holds the #1 rank on DirJournal's Cybersecurity & Digital Defense listing for San Francisco, California. Rankings are recalculated as providers earn verification, publish pricing tiers, and accumulate reviews. See the ranked grid above for the full top 6.
How much do cybersecurity firms typically cost in San Francisco?
Most cybersecurity firms publish pricing tiers on their DirJournal profile. Click any provider above to see their tiers, starting rate, and typical engagement size. Where pricing isn't listed, request a quote directly through the provider's contact link.
How does DirJournal rank cybersecurity firms for San Francisco?
Providers are hand-vetted by our editorial team, then ranked by verification status, tier, rating, and review count. Only published listings appear. Location matching for the San Francisco page runs city-first, expanding to statewide (California) or nationwide only when local coverage is thin — this is clearly disclosed on the page when it happens.
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