I have implemented most of the Simperium server protocol in the `node-simperium` library (https://github.com/Simperium/node-simperium/pull/22).

It's definitely a very rough work in progress but I have used it successfully to deploy my own simplenote server that works with all the clients.

Simperium Server: https://github.com/beaucollins/node-simperium-server

It's in the proof-of-concept stage so it doesn't persist the data on the server.

Protocol for reference: https://github.com/Simperium/simperium-protocol/blob/master/...

> Can I host my own Simperium service?

> You can mirror all your data to your own backend, but it's not yet possible to host Simperium yourself. We're open sourcing our client libraries, protocol, and a reference service implementation that will allow you to host your own service in the future.

https://simperium.com/pricing/

Are simperium and simplenote related? I am confused. Both are by auttomatic it seems.

Edit: looks like simperium is some data stashing service (like firebase?). And simplenote is an app built on top of simperium. Did I get that right?

Simplenote is built on top of Simperium.

In fact, Simperium was originally created to provide the syncing features of Simplenote and then generalized to work as a service for anyone who wants to sync structured data.

How are they supposed to make money if anybody can build the same back-end and steal their customers ?

Simplenote is free, WordPress.com pays the bills :)

I was using SimpleNote for free, I wasn't aware of a paid plan and couldn't find one one the website.

No paid tier. Completely free

What if there's completely free and completely open source alternatives already?

"People will decide if they want to give Automattic money".