Open-source tools that keep startup burn low
A practical early-stage open-source stack for keeping burn low and product velocity high before product-market fit.
Pillar guide
Startup StrategyValidation, venture design, market choices, and the practical work of building a company.
Building early means collecting tools that keep burn low and velocity high.
Instead of burning cash on bloated SaaS before finding product-market fit, most of the stack can be run on open-source repos.
A few libraries actually worth bookmarking:
- gstack by Garry Tan. Makes Claude handle planning, reviewing, and QA like an internal dev team.
- Dify. An open-source platform for running production AI workflows without reinventing the wheel.
- Supabase. The default choice for getting a backend, auth, and database up in an afternoon.
- Formbricks and OpenReplay. Essential for seeing where onboarding breaks and why users actually churn.
- Papermark. Tracks who opened your pitch deck, which slides they spent time on, and what they skipped.
- Lago. Handles complex billing logic - usage, seats, and credits - without forcing you to build Stripe wrappers from scratch.
Every hour spent building infrastructure from scratch is an hour stolen from talking to users.
What is the one open-source repo that actually saved your product this year?
If you are burning months building the wrong features before anyone cares, let us stress-test your assumptions before you write more code.