YCF25· AI· Data· DevtoolsLemma
Production Monitoring for AI agents
Founders
- Jerry ZhangFounder/CEO
- Cole GawinFounder/CTO
Same space
Competitors
Closest in what they build, same category.
The Context CompanyF25Find what's losing you customers and money in your AI agent and fix itShared: developer tools, analytics, monitoringActive
RaindropW24Sentry for AI AgentsShared: monitoringActive
TraceRoot.AIS25Open source self-improving layer for AI agentsShared: developer tools, infrastructureActive
RespanW24Self-driving observability, evals, and gateway for AI agentsShared: developer tools, monitoringActive
SerialW23Root cause manufacturing issues in secondsShared: analyticsInactive
Adjacent
Overlapping tags, a different niche.
Agnost AIS26We find where AI agents fail, then train better models to run them.Shared: developer tools, analytics, monitoringActive
ParadeDBS23Unify application data, vectors, and full-text search in one PostgresShared: developer tools, analytics, infrastructureActive
ParaQueryX25Managed GPU-accelerated Spark + SQL at 2x speed and half the costShared: developer tools, analytics, infrastructureActive
highlight.ioW23The open source, fullstack monitoring platform: stop guessing why…Shared: developer tools, monitoringAcquired
PareaS23Test, evaluate & observe your LLM applicationsShared: developer tools, monitoringActive
Also from F25 in AI
Batchmates in Fall 2025.
Kestrel AIF25AI Agents for Platform EngineeringActive
s2.devF25API for unlimited, durable, real-time streamsActive
AmikaF25Infra to build your own software factoryActive
Bolna AIF25Voice AI to enable India's next billionActive
BronF25TikTok for Sports TradingActive
CoastsF25Localhost service isolation and orchestration for git worktreesInactive
About Lemma
Lemma catches the silent, semantic failures your observability tools miss, where your AI agent looks like it worked but didn’t. We scan every trace to surface issues before users complain, identify root causes, and help you fix them without manual digging, so your agents improve over time.
San Francisco, CA, USA
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.
Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.