A free interactive generator, built by the law firm Cooley, that produces a customised Y Combinator SAFE for a US, UK or Singaporean company in a few minutes.

David Skok's widely cited primer on the metrics that actually predict a subscription business's health — LTV, CAC, churn, and the cash-flow trough that comes with scaling one.

Paul Graham's essay on the one question that decides whether a startup needs to raise again: will current revenue growth reach profitability before the cash on hand runs out?