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Antigen

Antigen continuously maps and exploits your attack surface with its tCell engine, which chains weaknesses like an attacker, then fixes confirmed vulnerabilities and verifies the fix.

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Introduction

Antigen calls itself a defense factory that maps, exploits and secures your entire attack surface. Its tCell engine links weaknesses the way an attacker would, so one small gap opens a path to the next until it reaches something that matters; scanners see the pieces, tCell finds the route.

Examples on the site include unsigned webhooks accepting forged events, exposed GraphQL introspection, over-scoped CI tokens and cross-tenant access. Product areas cover pentesting, remediation, an infrastructure graph, supply chain and an API/SDK.

Launch and background: Y Combinator’s company directory lists Antigen in its Fall 2025 batch, with the one-liner “Continuous offensive security for the enterprise.”.

Features

  1. Attack chaining: tCell links weaknesses into paths.
  2. Continuous exploitation: Ongoing testing.
  3. Remediation: Fixes confirmed issues.
  4. Fix verification: Re-tests after fixes.
  5. Infrastructure graph: Map of assets and links.

Pros

  1. Chain-focused: Finds multi-step attack paths.

Cons

  1. No public pricing: Contact sales.
  2. Early company: Fall 2025 batch.
  1. Connect cloud, code and app inventories.
  2. Review attack paths tCell discovers.
  3. Approve fixes and let Antigen verify them.

Resources:

Pricing

Prices were not listed on the website when checked on 11 November 2026; contact the vendor for plans.

  1. Enterprises with complex, multi-tenant systems.

Conclusion

Antigen focuses on how small weaknesses combine into real breaches.

Pilot it on one product line first.

On CheckOps, Antigen is filed under the Security testing and Production monitoring & observability stages. Related tools listed here include Aikido Security, Wiz, StackHawk, Burp Suite, Snyk and Socket. Which one fits best depends mostly on your stack, your team’s size and skills, and whether you prefer to run tools yourself or pay for a managed service. This page reflects the official website, documentation and repository as they stood on 11 November 2026.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Antigen side by side.