Ploy is an open-source serverless cloud with the whole stack included: databases, queues, cron, durable workflows, state, file storage, sandboxes, auth, and model access ship with every project, and you can self-host the entire platform for free. Vercel and Netlify focus on hosting request/response frontends on proprietary platforms, with the backend left to add-ons. That difference matters most for apps with real backends and for agents, which run long, call tools, hold state, and fail halfway through: Ploy's durable workflows outlive a single request and retry failed steps, sandboxes execute code an agent wrote, and each project gets its own SQLite database.