— named one of yc demo day's standout startups —

— named one of yc demo day's standout startups —

Built by Garry Tan - President of

Run gstack in the cloud.

With your team.

The full gstack workflow running on your real codebase in the cloud. No local setup. Team collaboration built in. Start in 60 seconds.

View gstack on GitHub

Start free

No credit card required · Works on your real repo.

Connect your repo.

Run gstack.

  1. Connect your GitHub repo

    Install the LightSprint GitHub app. Your code stays in your repo.

  2. Run any gstack phase

    Think, Plan, Build, Review, QA, Ship. Each phase runs as a cloud agent with full context of your codebase.

  3. Collaborate and ship

    Your whole team sees the output. Review plans together, preview changes live. No local setup required.

LightSprint Agent running in the cloud, connected to a designer with Build complete and Repository connecting status pills

Five reviews.

One plan.

Every change passes through specialized review agents before it ships, so the plan is bulletproof by the time anyone writes code.

Office Hours

Pressure-test the idea before a plan exists. Sharp questions on evidence and existing workarounds, ship the right thing or kill it early.

CEO Review

Strategy and scope. Premises get challenged, alternatives get weighed, and the 6-month regret scenario gets surfaced before a single line of code is touched.

Engineer Review

Architecture, edge cases, and tests. Every new codepath maps to coverage, every failure mode lands in a registry, and hidden complexity gets named.

Design Review

Information hierarchy, missing states, and the user journey. UX gaps get caught here, not in the implementer’s head at 2am.

Developer Experience

The view from the next engineer who touches this. New APIs, configs, and workflows have to feel obvious before the plan ships.

Everything gstack does.

Nothing to set up.

Your repo's main branch connected to a running agent with Plan approved and Build complete status pills

Cloud-native execution

No local Claude Code setup, no API keys to manage, no compute constraints. Agents run in isolated cloud environments on your real codebase.

Marketer, designer, and developer avatars placed along one shared workflow arc

Built for teams

Gstack locally is single-player. On LightSprint, your whole team sees every phase, reviews plans together, and ships from one shared workspace.

Live preview window of a change while the Gstack Agent tests the preview automatically

Live preview for every change

Every build phase gets its own live URL. Click through changes like a user before they touch production. QA phase tests it automatically.

Backed by

LightSprint is backed by Y Combinator and powers gstack for teams building in production.

The full gstack workflow running on your real codebase in the cloud. No local setup. Team collaboration built in. Start in 60 seconds.

Book a demo Start free