Garry Tan

Garry Tan

Y CombinatorY Combinator
President & CEO, Y Combinator
All activity
Stamp is the AI Secretary that thinks, writes, and works like you. Stamp handles your email and calendar for you by learning your preferences, using your style, and operating with your context. Get started with Stamp for free, available everywhere you use email!
Stamp
StampThe AI Secretary that thinks, writes, and works like you
Coding agents like Claude Code are great at generating GPU kernels if they’re told what your bottlenecks are. But they struggle to diagnose these performance bottlenecks themselves. The nCompass agent fills this gap by identifying key performance bottlenecks in the code and providing strategies to resolve them. By supercharging Claude Code with our agent, we generated matrix multiplication kernels that were 3% faster than NVIDIA's CUTLASS kernels in a single session. Now it’s your turn.
nCompass AI Assistant
nCompass AI AssistantEnabling everyone to write GPU kernels
The modern alternative to Zendesk, Freshdesk, Intercom, and Front. Connect your database and Stripe. Our AI support agent resolves tickets across email, forms, and other channels.
Letterbook
LetterbookAI support platform built for founders
Fully Managed OpenClaw Framework for all knowledge work ever. CRM Automation and Outreach agents. The only local productivity tool you need.
DenchClaw
DenchClawOpen Source AI CRM hosted locally on your machine
Out-of-the-box 30+ predefined metrics for analysis on CX, accuracy, conversation and voice quality. Compile perfect LLM judges by annotating just ~20 conversations and auto-improve in Cekura labs. Real-time, segmented dashboards to identify trends in Conversational AI. Smart statistical alerts so that you get notified only when metrics shift from historical baselines. Automated system pings to catch silent production failures.
Cekura
CekuraObserve and analyze your voice and chat AI agents
Lucent is an AI that watches your session replays 24/7, and automatically detects issues your users are running into in real time. Trusted by leading engineering teams like Reducto, Browser Use, and Productlane.
Lucent
LucentAI that watches your session replays and detects issues
AgentDiscuss is a product discussion platform for AI agents. Agents can: • discuss products • upvote tools • debate APIs Humans can launch their product and watch how agents react. Think Product Hunt — but the users are AI agents.
AgentDiscuss
AgentDiscussProduct Hunt for AI agents — where agents discuss products
ZeroSettle is a drop-in direct billing SDK for mobile apps. It takes 15 minutes to set up and developers immediately start enjoying zero App Store fees, higher user retention, and instant payouts.
ZeroSettle
ZeroSettleDrop-in direct billing SDK to skip the 30% Apple Tax
Struct is an AI agent that root-causes engineering alerts using logs, metrics, traces, and code. Resolve incidents faster with a composable, customizable system that deploys in minutes and works with your existing DevOps workflows.
Struct
StructAI agent that root-causes engineering alerts
gstack turns Claude Code from one generic assistant into a team of specialists you can summon on demand. Six opinionated workflow skills for Claude Code. Plan review, code review, one-command shipping, browser automation, and engineering retrospectives — all as slash commands.
GStack
GStackUse Garry Tan's exact Claude Code setup
70-80% of tech jobs are filled through referrals before they hit a job board. If you're not talking to the right people, the best opportunities will never find you. Meet Parker — your AI career super-connector on iMessage & WhatsApp 🔥 Parker maps out exactly who you should talk to, drafts personalized outreach that actually sounds like you, and gets you in the door. Companies also come to us to hire directly — so the best roles find you. Try Parker free → https://candidate.perfectly.so/
Parker by Perfectly
Parker by PerfectlyYour AI career super-connector
Perfectly is an AI-native recruiting agency that automates sourcing, outreach, screening, and qualification. Our agent Paul delivers interview-ready candidates directly to Slack and gives every candidate white-glove treatment to improve close rates. Built by ex-TikTok recommendation MLE for startups that need to hire fast.
Perfectly
PerfectlyThe first AI-native recruiting agency. Fill roles in days.
Gauge is your marketing agent for organic, paid, and AI search. With user behavior now spread across traditional and AI search, it’s never been more important to ensure that your brand is the answer. There's a wealth of data hidden across GA4, GSC, keywords, prompts, and more. This data is incredibly rich, but fragmented and complicated to understand. Gauge unifies all of these data sources into a single agent that can do the work of an entire marketing team for you.
Gauge
GaugeYour marketing agent for organic, paid, and AI search
Teams use IonRouter as a drop‑in OpenAI-compatible API to hit the best open models for LLMs, vision, video, and TTS at HALF market rate. You can run agents and multi‑modal apps, and deploy your finetunes on our fleet while we handle optimization and scaling in the background. Under the hood, IonRouter runs a custom inference engine (IonAttention) built for NVIDIA Grace Hopper, cutting price and latency for your workloads.
IonRouter
IonRouter Serve Any AI Model, Faster & Cheaper
Chordio helps PMs and designers prototype directly on their product even in complex enterprise environments. It runs in Claude Code and starts with cloning the front-end of the product and relevant context into a dedicated repository to enable prototyping securely in minutes with no heavy setup. It ships with built-in agent skills and a local dashboard to help with research, prototype, review, and stakeholder communication to support the full workflow from concept to a “ship it” decision.
Product Workbench for Claude Code
Product Workbench for Claude CodeTurn feature ideas into stakeholder-ready code prototypes
Cardboard is an agentic video editor that gets you from raw footage to final cut in minutes. Think of it like an intelligent collaborator, one that understands what's in your clips, has the taste to know what a good edit looks like, and executes your vision.
Cardboard
CardboardCursor for video editing
sitefire (YC W26) is the marketing suite for the agentic web. We don't just monitor - we act: sitefire agents analyze what content drives citations, write brand-aware articles, and push to your CMS (Framer, Webflow). sitefire agents also surface PR outlets and UGC that influences AI answers, and provide tailor-made outreach suggestions. Save yourself a SEO and content person, and use sitefire to start marketing to agents.
sitefire.ai
sitefire.aiMarketing suite for the agentic web
SuperSend is the cold email sequencer that handles everything underneath it too. Build multi-channel sequences across email, LinkedIn, and Twitter with A/B testing, conditional routing, and a unified inbox for every reply. Then go deeper: buy mailboxes and domains inside the app, run automated warmup, test inbox placement, and monitor deliverability — without touching another tool. Most teams use 4-5 tools to do what SuperSend does in one. Plans from $99/month.
SuperSend 3.0
SuperSend 3.0Sequences, infrastructure, deliverability. One product.
With Spine, you can manage and deploy swarms of AI agents that complete complex tasks from start to finish. Agents browse the web, conduct deep research, build 50-page strategy documents, generate detailed presentations, create interactive prototypes, and more — all with one prompt. The result: Auditable work on a visual canvas that’s far more thorough, accurate, and complete than what you get from ChatGPT, Gemini, or Claude.
Spine Swarm
Spine SwarmManage a team of AI agents that do real work
Connect Sentry, Datadog, or any monitoring tool. Sonarly's agents triage your alerts, deduplicate the noise, and fix bugs with full context of your production system. Autonomously! Most monitoring tools tell you what broke. Sonarly tells you why, groups the duplicates, and hands you a production-aware PR with evidence. Powered by Claude Code and Opus 4.6 with deep production context by Sonarly.
Sonarly
SonarlyThe AI that fixes prod autonomously