Cloudflare Durable Objects

Durable Objects deserves a dedicated entry because it is not just storage and not just serverless compute. It is a stateful programming model that combines compute and strongly consistent storage inside globally unique object instances. That makes it extremely relevant for collaborative apps, chat, multiplayer coordination, realtime systems, and more recently AI agents that need shared state without introducing a separate backend coordination layer.

Its pricing is more nuanced than D1 or KV because it bills both compute and storage. On the Free plan, you get 100,000 requests per day and 13,000 GB-seconds of duration per day, plus daily SQLite-backed storage limits. On the Paid plan, the first 1 million requests and 400,000 GB-seconds are included monthly, then requests are $0.15 per million and compute duration is $12.50 per million GB-seconds. SQLite-backed storage has its own row-read, row-write, and GB-month charges, aligned closely with D1. That means Durable Objects should be treated as a combined coordination-and-state primitive, not as 'just another Cloudflare storage option.'