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14,448 startups · 29 programs

Lark

Active · The E2E testing layer for AI-driven development

WebsiteYC profile

Why it ranks

How the rank works
8signal of 100 · rising 6
  • team of 5Team size · YC's directory+4
  • went through YCProgram · this site+4

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

Competitors

AIAutosanaShared: testing layer, e2e testing, featureYC S25San FranciscoStartup →AIArtilleryShared: e2e testing, devops, productionYC S21LimerickStartup →AIRetroFixShared: plain english, write, apisYC S24New York CityStartup →Developer toolsAcquiredwebapp.ioShared: e2e testingYC S20TorontoStartup →AIDocketShared: plain english, testing, writeYC X25San FranciscoStartup →
Companies closest to Lark
Company
AutosanaShared: testing layer, e2e testing, featureYC S25ActiveAI, Devtools
ArtilleryShared: e2e testing, devops, productionYC S21ActiveAI, Devtools
RetroFixShared: plain english, write, apisYC S24ActiveAI, Devtools
webapp.ioShared: e2e testingYC S20AcquiredDevtools
DocketShared: plain english, testing, writeYC X25ActiveAI, Devtools

Adjacent

AIInferaShared: plain english, automation, runYC X26San FranciscoStartup →AIZeon SystemsShared: plain english, automation, fullYC X25San FranciscoStartup →Developer toolsInactiveDimeShared: e2e, testing, writeYC S21San FranciscoStartup →AINarrativeShared: plain english, testingYC W23San FranciscoStartup →AINemodataShared: run continuouslyPlug and PlayIsraelStartup →
Companies next to Lark
Company
InferaShared: plain english, automation, runYC X26ActiveAI
Zeon SystemsShared: plain english, automation, fullYC X25ActiveAI
DimeShared: e2e, testing, writeYC S21InactiveDevtools
NarrativeShared: plain english, testingYC W23ActiveAI, Devtools
NemodataShared: run continuouslyPlug and Play Not statedAI

Also from S25 in AI

All of S25
AIDedalus LabsPersistent computers for AI agentsYC S25San FranciscoStartup →AINotteBrowser infra for AI agents: sessions, auth, proxies, paymentsYC S25San FranciscoStartup →AIAgentMailEmail Inboxes for AI AgentsYC S25San FranciscoStartup →AIAlterPrivileged Access Management for AI AgentsYC S25New York CityStartup →AICactus ComputeAutomation Foundation Models For Tiny DevicesYC S25San FranciscoStartup →AICyberdeskSelf learning computer use agent for developersYC S25San FranciscoStartup →
Company
Dedalus LabsPersistent computers for AI agentsteam of 8hiringActiveAI, Devtools
NotteBrowser infra for AI agents: sessions, auth, proxies, paymentsteam of 5ActiveAI, Devtools
AgentMailEmail Inboxes for AI Agentsteam of 10hiringActiveAI, Devtools
AlterPrivileged Access Management for AI Agentsteam of 2ActiveAI, Devtools
Cactus ComputeAutomation Foundation Models For Tiny Devicesteam of 8ActiveAI, Devtools
CyberdeskSelf learning computer use agent for developersteam of 2ActiveAI, Devtools

Founders

  • Vijit DhingraFounder
  • Jack BrownFounder

About Lark

Lark lets teams write end-to-end tests in plain English. Validate dashboards, APIs, SDKs, and full product flows without maintaining fragile test code. Run continuously on feature branches, in CI, or in production.

YC batch
S25 · Summer 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
5
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

YC tags: Developer Tools, B2B, DevOps, Automation, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Lark in S25: 166 companies, 92% AI

LinkedIn

Lark: questions

Which YC batch was Lark in?

Lark was in Y Combinator's Summer 2025 batch (S25).

Is Lark still active?

Y Combinator lists Lark as active.

Who founded Lark?

Lark's founders, as listed on its YC page: Vijit Dhingra (Founder), Jack Brown (Founder).

Where is Lark based?

Lark lists San Francisco, CA, USA as its location on YC's directory.