Cloudflare

license

Proprietary

source

closed

service

proprietary Cloudflare edge (Workers/Durable Objects/Dynamic Worker Loader - no self-host of the isolate/container plane)

open-part

Sandbox SDK only (@cloudflare/sandbox Apache-2.0, cloudflare/sandbox-sdk on GitHub)

pricing

Workers paid plan, Dynamic Workers $0.002/unique-worker/day

Closed managed service. The Sandbox SDK is Apache-2.0, but execution requires Cloudflare's proprietary managed edge network (no self-host of the isolate/container plane); an open client SDK over a closed runtime is not open_core. Reclassified from open_core.

• https://github.com/cloudflare/sandbox-sdk recorded 2026-06-04

  Apache-2.0 SDK; runs on Cloudflare Containers/Workers/Durable Objects (managed edge)

• https://blog.cloudflare.com/dynamic-workers/ recorded 2026-06-04

  Dynamic Worker Loader open beta, isolate sandboxing, post-beta $0.002/worker/day pricing