Theo - t3.gg
@theo
Full time CEO @t3dotchat. Part time YouTuber, investor, and developer
The T3 Stack
“The stack he created and maintains (create-t3-app): Next.js, TypeScript, tRPC, Tailwind, Drizzle/Prisma and Zod. It's what made him famous.”
Next.js
“The React framework at the core of the T3 Stack and nearly everything he ships.”
TypeScript
“End-to-end type safety is the whole thesis of his stack.”
tRPC
“Typesafe APIs with no codegen, a signature piece of the T3 Stack. He's said his own newer projects lean on it less (as of ~2025).”
Drizzle ORM
“Champions Drizzle as the modern ORM choice; T3 now ships it alongside Prisma (~2024).”
Prisma
“The original T3 ORM; he's since pushed Drizzle as the default pick.”
Zod
“Runtime validation across his stack, paired with typed env vars via his own T3 Env.”
Excalidraw
“"Of all my favorite tools, Excalidraw would be the hardest to leave behind."”
Cursor
“His primary AI code editor through ~2025 (plan mode + Opus models). He switches AI tools constantly, so treat this as a snapshot.”
OpenAI Codex
“His newer AI-coding setup reportedly moved to the Codex harness with GPT-5.5 and a browser-based remote workflow (~2025).”
t3.chat
“His own multi-model AI chat app: OpenAI, Claude, Gemini, DeepSeek, Kimi, GLM and more behind one local-first (IndexedDB) interface.”
UploadThing
“The file-upload service he built for the T3 Stack (S3-backed CDN) and dogfoods in his own apps.”
Ping.gg
“His YC-built livestream collaboration tool; call recordings stored on AWS S3.”
Mux
“Video infrastructure he's used and worked with for uploads and streaming.”
PlanetScale
“The database host behind t3.chat ("T3 Chat is technically back on PlanetScale").”
Convex
“Handled t3.chat's database migration path ("Convex made the transition for us").”
