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14,448 startups · 29 programs

Casco

Active · Autonomous security testing for web apps, APIs, cloud, and AI systems

WebsiteYC profile

Why it ranks

How the rank works
11signal of 100 · rising 8
  • team of 10Team size · YC's directory+5.4
  • went through YCProgram · this site+4
  • hiringHiring · Titles (titles.fru.dev), YC+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AIWorfShared: autonomous securityAlchemist Class 34Palo AltoStartup →AIOblixShared: security testing, autonomous500 Global 2025United StatesStartup →AIMindFortShared: autonomous security, web, humanYC X25Los AngelesStartup →AIViableShared: web apps, humanAntler 2026SingaporeStartup →Developer toolsKonduktoShared: security testing500 Global 2019TurkeyStartup →
Companies closest to Casco
Company
WorfShared: autonomous securityAlchemist Class 34Not statedAI
OblixShared: security testing, autonomous500 Global 2025Not statedAI
MindFortShared: autonomous security, web, humanYC X25ActiveAI, Devtools
ViableShared: web apps, humanAntler 2026Not statedAI
KonduktoShared: security testing500 Global 2019Not statedDevtools

Adjacent

AITridentShared: web apps, apis, autonomousYC S26San FranciscoStartup →Developer toolsAcquiredHunter2Shared: web apps, securityYC W18BostonStartup →Developer toolsAcquiredReflectShared: web apps, testingYC S20VillanovaStartup →OtherLuchs SecurityShared: security testingPlug and PlayGermanyStartup →Developer toolsAcquiredFirebaseShared: web apps, infrastructureYC S11San FranciscoStartup →
Companies next to Casco
Company
TridentShared: web apps, apis, autonomousYC S26ActiveAI
Hunter2Shared: web apps, securityYC W18AcquiredDevtools
ReflectShared: web apps, testingYC S20AcquiredDevtools
Luchs SecurityShared: security testingPlug and Play Not statedOther
FirebaseShared: web apps, infrastructureYC S11AcquiredDevtools

Also from X25 in AI

All of X25
AIAcoliteAI Native Commercial Insurance BrokerYC X25PhiladelphiaStartup →AIAdentrisReal-time AI Compliance & Revenue Integrity for Medical ProvidersYC X25San FranciscoStartup →AIAegisAI Agents to win denied health insurance claims.YC X25San FranciscoStartup →AIAirweaveThe open-source context retrieval layer for agentsYC X25San FranciscoStartup →AIAlkaliThe smarter way to estimate steel.YC X25HoustonStartup →AIAlmondAmerica's robot factoryYC X25San FranciscoStartup →
Company
AcoliteAI Native Commercial Insurance Brokerteam of 3ActiveAI
AdentrisReal-time AI Compliance & Revenue Integrity for Medical Providersteam of 5hiringActiveAI
AegisAI Agents to win denied health insurance claims.team of 3ActiveAI
AirweaveThe open-source context retrieval layer for agentsteam of 7hiringActiveAI, Devtools
AlkaliThe smarter way to estimate steel.team of 2hiringActiveAI, Devtools
AlmondAmerica's robot factoryteam of 6hiringActiveAI

Founders

  • Rene BrandelFounder/CEO
  • Ian SaultzFounder/CTO

About Casco

Casco performs autonomous security testing for your web apps, APIs, infrastructure, and AI systems. Human supervision optionally available. Use Casco for year-round security and get a penetration test report for your SOC2 and ISO27001 compliance certifications. Trusted by 100+ companies from enterprises to fast-moving startups, such as Gusto, CrewAI, Novig, and Accrual. Hack yourself at: https://casco.com --- We already secure software deployed in 60% of Fortune 500 companies and are default alive. [1] [1] http://www.paulgraham.com/aord.html

YC batch
X25 · Spring 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
10
Founded
2025
Checked
6h ago

Casco in X25: 144 companies, 90% AI

LinkedIn

Casco: questions

Which YC batch was Casco in?

Casco was in Y Combinator's Spring 2025 batch (X25).

Is Casco still active?

Y Combinator lists Casco as active.

Who founded Casco?

Casco's founders, as listed on its YC page: Rene Brandel (Founder/CEO), Ian Saultz (Founder/CTO).