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14,448 startups · 29 programs

Lemma

Active · Production Monitoring for AI agents

WebsiteYC profile

Why it ranks

How the rank works
9signal of 100 · rising 7
  • went through YCProgram · this site+4
  • team of 2Team size · YC's directory+2.5
  • hiringHiring · Titles (titles.fru.dev), YC+2

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

Competitors

AIConfident AIShared: production monitoring, observability tool, evalYC W25San FranciscoStartup →AIRaindropShared: silent failure, monitoring, agentYC W24San FranciscoStartup →AIHamming AIShared: production monitoring, agent, beforeYC S24San FranciscoStartup →AIMontblancAIShared: production monitoringPlug and PlayUnited StatesStartup →AIArtilleryShared: production monitoringYC S21LimerickStartup →
Companies closest to Lemma
Company
Confident AIShared: production monitoring, observability tool, evalYC W25ActiveAI, Devtools
RaindropShared: silent failure, monitoring, agentYC W24ActiveAI, Devtools
Hamming AIShared: production monitoring, agent, beforeYC S24 +1ActiveAI, Devtools
MontblancAIShared: production monitoringPlug and Play Not statedAI, Data
ArtilleryShared: production monitoringYC S21ActiveAI, Devtools

Adjacent

AIThe Context CompanyShared: monitoring, analytics, productionYC F25San FranciscoStartup →AIPlaygentShared: tool call, infrastructure, productionYC S25San FranciscoStartup →DataEmber RoboticsShared: observability tool, analyticsYC S24San FranciscoStartup →AIAgnost AIShared: monitoring, analytics, agentYC S26San FranciscoStartup →OtherEast Meet EastShared: user find500 Global 2015United StatesStartup →
Companies next to Lemma
Company
The Context CompanyShared: monitoring, analytics, productionYC F25ActiveAI, Data, Devtools
PlaygentShared: tool call, infrastructure, productionYC S25ActiveAI, Devtools
Ember RoboticsShared: observability tool, analyticsYC S24ActiveData, Devtools
Agnost AIShared: monitoring, analytics, agentYC S26 +1ActiveAI, Data, Devtools
East Meet EastShared: user find500 Global 2015Not statedOther

Also from F25 in AI

All of F25
AIKestrel AIAI Agents for Platform EngineeringYC F25San FranciscoStartup →AIs2.devAPI for unlimited, durable, real-time streamsYC F25San FranciscoStartup →AIAirCaps AIVoice AI that hears what other models miss.YC F25San FranciscoStartup →AIAmikaTurn any spare computer into agent devboxes or CI runnersYC F25New York CityStartup →AIBolna AIVoice AI to enable India's next billionYC F25BengaluruStartup →AIBronTikTok for Sports BettingYC F25San FranciscoStartup →
Company
Kestrel AIAI Agents for Platform Engineeringteam of 2ActiveAI, Devtools
s2.devAPI for unlimited, durable, real-time streamsteam of 5ActiveAI, Data, Devtools
AirCaps AIVoice AI that hears what other models miss.team of 5hiringActiveAI, Devtools
AmikaTurn any spare computer into agent devboxes or CI runnersteam of 2ActiveAI, Devtools
Bolna AIVoice AI to enable India's next billionteam of 21hiringActiveAI, Devtools
BronTikTok for Sports Bettingteam of 2ActiveAI, Data

Founders

  • Jerry ZhangFounder/CEO
  • Cole GawinFounder/CTO

About Lemma

Lemma is production monitoring for AI agents. We catch the silent failures your observability tools and evals miss (think bad tool calls, lost context, and infinite loops) before your users find them.

YC batch
F25 · Fall 2025
Status, per YC
Active
Category
AI, Data, Developer tools
Team size
2
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

YC tags: Developer Tools, Analytics, Infrastructure, Monitoring, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Lemma in F25: 146 companies, 88% AI

LinkedIn

Lemma: questions

Which YC batch was Lemma in?

Lemma was in Y Combinator's Fall 2025 batch (F25).

Is Lemma still active?

Y Combinator lists Lemma as active.

Who founded Lemma?

Lemma's founders, as listed on its YC page: Jerry Zhang (Founder/CEO), Cole Gawin (Founder/CTO).

Where is Lemma based?

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