bhvr is the opposite end of the spectrum from the Big Three: Next/Rails/Django hand you batteries, bhvr hands you a rocket fuel can. One Bun binary replaces npm + Node + Jest, Hono routes run everywhere from Cloudflare Workers to bare-metal Bun, and a shared types/ folder gives you end-to-end TS safety—zero extra runtime, zero config. You lose turnkey SSR, auth, and ORM magic, but if you care more about installing, hot-reloading, and deploying in under 60 seconds than about convention-heavy kitchensinks, bhvr is the leanest full-stack starter in 2025.