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14,448 startups · 29 programs

Preflight

Acquired · No-code Web Apps testing for everyone

WebsiteYC profile

Why it ranks

How the rank works
12signal of 100 · rising 2
  • team of 5Team size · YC's directory+4
  • acquiredOutcome · YC, program pages, Acquisitions+4
  • went through YCProgram · this site+4

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

Competitors

Developer toolsAcquiredReflectShared: web apps, selenium, testYC S20VillanovaStartup →AIAutosanaShared: test passes, web apps, codeYC S25San FranciscoStartup →AIDocketShared: web testing, userYC X25San FranciscoStartup →AICascoShared: web apps, testingYC X25Startup →Developer toolsKarate LabsShared: api test, code, workflowYC W22WilmingtonStartup →
Companies closest to Preflight
Company
ReflectShared: web apps, selenium, testYC S20AcquiredDevtools
AutosanaShared: test passes, web apps, codeYC S25ActiveAI, Devtools
DocketShared: web testing, userYC X25ActiveAI, Devtools
CascoShared: web apps, testingYC X25ActiveAI, Devtools
Karate LabsShared: api test, code, workflowYC W22ActiveDevtools

Adjacent

AIViableShared: web appsAntler 2026SingaporeStartup →DataPolytomicShared: code webYC W20San FranciscoStartup →Developer toolsWaspShared: web apps, code, solveYC W21ZagrebStartup →AIAcquiredMochaShared: web apps, everyone, userYC S23San FranciscoStartup →AINarrativeShared: cypress, selenium, testYC W23San FranciscoStartup →
Companies next to Preflight
Company
ViableShared: web appsAntler 2026Not statedAI
PolytomicShared: code webYC W20ActiveData
WaspShared: web apps, code, solveYC W21ActiveDevtools
MochaShared: web apps, everyone, userYC S23AcquiredAI, Devtools
NarrativeShared: cypress, selenium, testYC W23ActiveAI, Devtools

Also from W19 in Developer tools

All of W19
Developer toolsAlpacaAPI-first stock and crypto brokerage platformYC W19San FranciscoStartup →Developer toolsDaggerDevelop your CI/CD pipelines as code and run them anywhereYC W19San FranciscoStartup →Developer toolsAcquiredDopplerSecure secrets. Prevent breaches. Keep teams moving.YC W19AustinStartup →Developer toolsMobotMobot is a QA-as-a-service platform using actual mechanical robotsYC W19New York CityStartup →Developer toolsOktetoCloud Development Environments with one clickYC W19San FranciscoStartup →Developer toolsAcquiredSlapdashWork at the speed of thoughtYC W19San FranciscoStartup →
Company
AlpacaAPI-first stock and crypto brokerage platformteam of 150hiringActiveDevtools
DaggerDevelop your CI/CD pipelines as code and run them anywhereteam of 22ActiveDevtools
DopplerSecure secrets. Prevent breaches. Keep teams moving.team of 25acquiredAcquiredDevtools
MobotMobot is a QA-as-a-service platform using actual mechanical robotsteam of 40ActiveDevtools
OktetoCloud Development Environments with one clickteam of 30hiringActiveDevtools
SlapdashWork at the speed of thoughtteam of 6acquiredAcquiredDevtools

About Preflight

PreFlight is a No-code web testing tool for anyone. Preflight is 20x faster than writing Selenium and Cypress tests. Maintaining Selenium/Cypress tests is also a big challenge. Preflight solves this problem by understanding how users understand any page and adapt to the changes and update the selectors if the test passes. It's also super easy to set up end-to-end tests that depend on each other with Preflight's Workflow feature. You can orchestrate which test should run after another. Creating API tests has never been so easy. Preflight prepopulates API tests from UI tests' network calls. So, you can set up API tests in minutes.

YC batch
W19 · Winter 2019
Status, per YC
Acquired
Category
Developer tools
Team size
5
Location
Chicago, IL, USA; Remote
Checked
6h ago

YC tags: Developer Tools, SaaS, B2B

Preflight in W19: 194 companies, 27% AI

Preflight: questions

Which YC batch was Preflight in?

Preflight was in Y Combinator's Winter 2019 batch (W19).

Is Preflight still active?

Y Combinator lists Preflight as acquired.

Where is Preflight based?

Preflight lists Chicago, IL, USA; Remote as its location on YC's directory.