> there is no a single Durable Objects alternative at the moment

If you live in Elixir land, there's this repo from the Phoenix team, which is quite good. It has pluggable storage, and EKV (https://github.com/chrismccord/ekv) is supported as "batteries include" type storage adapter.

https://github.com/phoenixframework/durable_server

There is rivet and terse

https://github.com/elyase/awesome-object-storage-native#stat...

Celld seems great, did not even know!

Meaning better that there is no alternative?

Rivet