If you try to save a gist anonymously you will be presented with a 404.
However, You can still save gists if you are logged into Github Gist and have user Authentication.
Personally, I don't know of any alternative to Github Gists off the top of my head for saving your dabblets anonymously. Although, I thought I'd share cause I know you use Gists in Dabblet and would be an important note.
Thanks for letting me know. I guess I should prompt for authentication when someone tries to save. :(
Sadly I have no time to do that, but would merge a PR about it.
Important Update:
As of Mar 21, 2018 Github updated their API on Gists. In which you can no longer save gists anonymously.
If you try to save a gist anonymously you will be presented with a 404.
However, You can still save gists if you are logged into Github Gist and have user Authentication.
Personally, I don't know of any alternative to Github Gists off the top of my head for saving your
dabblets
anonymously. Although, I thought I'd share cause I know you use Gists in Dabblet and would be an important note.