Hi, is pulumi service a proprietary software? Or is it possible to self-host it without license? Thanks

It is. You can self-host the Service, but that requires a commercial license: https://pulumi.com/pricing

You have additional options to use your own state file storage (any of the 3 major clouds) and secrets provider (any of the 3 major clouds + HashiCorp Vault): https://www.pulumi.com/docs/intro/concepts/state/

Oh, ok. Thanks for the info. :-)

you can do a self host trial as well if you'd like! https://www.pulumi.com/product/self-hosted/#self-hosted-trial