CISO Tribune

Vendor comparison · 2 companies

Red Sift vs Tenable

Red Sift helps security and IT teams embrace the security protocols that keep the internet safe, such as DMARC, SPF, DKIM and TLS. Tenable sells Tenable One, a platform that unifies security visibility, insight and action across an attack surface. CISO Tribune files both under External attack surface management. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Red Sift
  • Tenable
Red Sift vs Tenable: Products, Customers and Funding Compared
Red SiftRed Sift helps security and IT teams embrace the security protocols that keep the internet safe, such as DMARC, SPF, DKIM and TLS.redsift.comTenableTenable sells Tenable One, a platform that unifies security visibility, insight and action across an attack surface.tenable.com
What it sells
  • Red Sift OnDMARC[2][9]Email authentication product for DMARC enforcement.
  • Tenable One[2][3][4][8]A platform that unifies security visibility, insight and action across an attack surface.
Categories
Headquarters
London, United Kingdom[5][6]Not stated on its pages
Founded
2015[3]2002
Ownership and funding
Privately held[2][4][15]Not stated on its pages
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • October 21, 2026Red Sift notified customers with potentially affected hosts after scanning the Hardenize customer base for PHP-backed hosts, following the PHP security fixes.[18]
Not stated on its pages
G2 and Gartner Peer Insights
  • G2: listed, seen November 4, 2026[15]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, the company sells mainly to security and IT teams that want to adopt protocols such as DMARC, SPF, DKIM and TLS. Save the Children also appears as a customer story for OnDMARC. The about page says the company works across EMEA, APAC and the US.Tenable describes converged OT and IT environments among the environments it covers. Tenable's pages cover multi-cloud and hybrid cloud environments, and Active Directory and Entra ID identity environments. Tenable describes highly dynamic cloud or remote workforce assets among those its asset discovery covers.
Last verified
September 27, 2026November 5, 2026

Where they overlap

  • Red Sift and Tenable are both filed under External attack surface management.

Where they differ, field by field

  • Red Sift's primary category is Email authentication and DMARC; Tenable's is Vulnerability management.
  • Red Sift is also filed under Digital risk protection and Machine identity and PKI. Tenable is also filed under Cloud-native application protection (CNAPP) and OT and ICS security.
  • Red Sift lists Red Sift OnDMARC. Tenable lists Tenable One.
  • Red Sift is headquartered in London, United Kingdom.
  • Red Sift was founded in 2015. Tenable was founded in 2002.
  • Red Sift is privately held.

What it sells: Red Sift

What Red Sift OnDMARC does[2][9]
Red Sift OnDMARC gives instant visibility into a domain's email security posture and a clear path to DMARC enforcement. It lets customers configure SPF, DKIM, DMARC, BIMI and MTA-STS in one place. Red Sift says it helps organizations reach full DMARC enforcement in just 6 to 8 weeks.

What it sells: Tenable

What Tenable One does[2][3][4][8]
Tenable One maps the attack surface across infrastructure, cloud, identity, OT, third-party applications and AI. Tenable Hexa AI is the agentic layer of Tenable One.

Questions about Red Sift and Tenable

What do Red Sift and Tenable sell?
Red Sift sells Red Sift OnDMARC. Tenable sells Tenable One.
Are Red Sift and Tenable in the same category?
They share External attack surface management. Red Sift's primary category is Email authentication and DMARC and Tenable's is Vulnerability management.
Where are Red Sift and Tenable headquartered?
Red Sift is headquartered in London, United Kingdom.
When were Red Sift and Tenable founded?
Red Sift was founded in 2015. Tenable was founded in 2002.
Who owns Red Sift and Tenable?
Red Sift is privately held.
Who are Red Sift and Tenable sold to?
From its own pages, the company sells mainly to security and IT teams that want to adopt protocols such as DMARC, SPF, DKIM and TLS. Tenable describes converged OT and IT environments among the environments it covers.
What have Red Sift and Tenable announced recently?
October 21, 2026: Red Sift notified customers with potentially affected hosts after scanning the Hardenize customer base for PHP-backed hosts, following the PHP security fixes.

About Red Sift

Red Sift helps security and IT teams embrace the security protocols that keep the internet safe, such as DMARC, SPF, DKIM and TLS. Red Sift says it is creating a fundamentally safer internet through proactive security across email, web and PKI.[7][8]

Red Sift OnDMARC is the company's email authentication product. Red Sift says OnDMARC gives instant visibility into a domain's email security posture and a clear path to DMARC enforcement. Red Sift says OnDMARC helps organizations reach full DMARC enforcement in just 6 to 8 weeks. OnDMARC lets customers configure SPF, DKIM, DMARC, BIMI and MTA-STS in one place. Red Sift OnDMARC includes integrated VMC provisioning to simplify BIMI adoption.[9]

Red Sift Radar is part of the OnDMARC offering. Red Sift says Radar pinpoints the root cause of issues like misaligned SPF records or unauthorized IPs. DNS Guardian provides continuous monitoring of DNS configuration to prevent SubdoMailing, dangling DNS and CNAME takeovers.[9]

Red Sift describes it as detecting, monitoring and taking down malicious lookalikes with AI-powered domain and brand protection. Red Sift says Brand Trust can scan up to 150 million domains daily. Brand Trust lets teams issue takedown packages, escalate to enforcement bodies, or integrate intelligence into a SIEM and SOC. Social Media Monitoring in Brand Trust detects and removes fake profiles across Facebook, Instagram, X, TikTok, YouTube and LinkedIn.[11]

Red Sift describes the problem it addresses as impersonation attacks against a brand. Its pages say that without DMARC, attackers can send spoofed emails from a domain to customers' inboxes, and that lookalike domains and phishing websites can be used to scam customers. Red Sift says it helps resource constrained security and IT teams reach DMARC enforcement in just 6-8 weeks.[7]

Red Sift names customers across several sectors. Red Sift also publishes guidance aimed at healthcare organizations and at MSPs offering DMARC services.[16][17]

Red Sift says it works across EMEA, APAC and the US. Red Sift says it has team members in 18 countries. Red Sift's homepage refers to 1,500+ security teams that choose it.[1][7][8][9][10][12][13][14]

Red Sift on the record

Sources

Red Sift full record

  1. [1]redsift.comRed Sift · redsift.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]The Red Sift Pulse PlatformRed Sift · undated page, accessed September 27, 2026 · Tier A
  3. [3]Cloud email security brand protection startup red sift rises 54mSiliconANGLE · siliconangle.com · published February 24, 2022 · Tier B
  4. [4]6977295001Austin American-Statesman · statesman.com · published March 4, 2022 · Tier B
  5. [5]Red sift joins future fifty 2026 cohort unveiled by chancellor at downing streetRed Sift via EIN Presswire · thestarpress.com · published March 19, 2026 · Tier B
  6. [6]Red siftThe Wealth Mosaic · thewealthmosaic.com · undated page, accessed September 27, 2026 · Tier C
  7. [7]Red Sift | Creating a Fundamentally Safer Internet with Proactive SecurityRed Sift · undated page, accessed October 27, 2026 · Tier A
  8. [8]Proactive, intelligent security for every organization.Red Sift · undated page, accessed October 27, 2026 · Tier A
  9. [9]Red Sift OnDMARC | Stop Email Spoofing FastRed Sift · undated page, accessed October 27, 2026 · Tier A
  10. [10]OnDMARC Pricing | Plans for SMB to Enterprise + Free TrialRed Sift · undated page, accessed October 27, 2026 · Tier A
  11. [11]Stop lookalike domains before they damage your brandRed Sift · undated page, accessed October 27, 2026 · Tier A
  12. [12]Bird & Bird strengthens trust in legal communications with layered email and domain protectionRed Sift · undated page, accessed October 27, 2026 · Tier A
  13. [13]Find and fix issues 10x faster with Red Sift RadarRed Sift · undated page, accessed October 27, 2026 · Tier A
  14. [14]Red Sift Certificates Lite | Free Certificate MonitoringRed Sift · undated page, accessed October 27, 2026 · Tier A
  15. [15]Red Sift OnDMARC Reviews 2026: Details, Pricing, & Features | G2G2 · undated page, accessed October 27, 2026 · Tier C
  16. [16]How to Price and Package DMARC Services for Your MSP | Red SiftRed Sift · undated page, accessed November 4, 2026 · Tier A
  17. [17]DMARC solutions for healthcare organizationsRed Sift · undated page, accessed November 4, 2026 · Tier A
  18. [18]Critical PHP vulnerabilities CVE-2026-109618 and CVE-2026-109619 | Red SiftRed Sift · published October 21, 2026 · Tier A

Tenable full record

  1. [1]About usTenable · tenable.com · undated page, accessed November 5, 2026 · Tier A
  2. [2]Vulnerability and exposure management | Cloud and AI security | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  3. [3]Tenable One Vulnerability Management | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  4. [4]Tenable One Pricing | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  5. [5]Tenable One exposure management platform and products | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  6. [6]AI security solutions | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  7. [7]ISO/IEC 27001/27002 | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  8. [8]Tenable One connectors | Tenable®Tenable · undated page, accessed November 10, 2026 · Tier A
  9. [9]Tenable Trust PortalTenable · undated page, accessed November 10, 2026 · Tier A
  10. [10]Tenable Vulnerability Management Reviews 2026G2 · undated page, accessed November 10, 2026 · Tier C
  11. [11]Tenable Reviews, Ratings & Features 2026Gartner Peer Insights · undated page, accessed November 10, 2026 · Tier C

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