GitHub Stars Don't Equal PMF: Metrics That Actually Matter for Dev-Tools Founders

HashiCorp had 47,000 GitHub stars before signing its first enterprise contract. The developer tools market can generate extraordinary community momentum that's structurally disconnected from commercial traction — and it's a trap that catches technically sophisticated founders who should know better. Stars measure awareness. Forks measure interest. Neither measures willingness to pay. The metrics with actual predictive power for dev-tools PMF: integration depth — how many internal systems does your tool touch? Removal cost — what breaks when a team uninstalls it? Conversion from free to paid among engineering organisations above 50 people. Those numbers reveal commercial PMF. Below-50-engineer shops are a different market with different economics — make sure you know which one you're validating in.