[erebe__]

You can take a look at www.qovery.com It provides an Heroku like experience but runs on your cloud account (aws, scaleway or digital ocean).

They build on existing tech that is already working, so it is more stable.

[ignoramous]

Save for a few "in-preview" features, Fly was stable too but then they started growing faster than they could keep up (a good problem to have!). Stability isn't a permanent state.