Thanks! Schemio is open-sourced with the exception of the backend part of https://schem.io. But the frontend code is completely open and you can even host your own server. Although in that case it would simply use a file system as a storage, so no database and no user management.

Do you mean that there are two servers:

1. a basic open source one you can self-host,

2. and another closed-source one with accounts and other features that schem.io uses?

And (I'm just thinking out loud, and don't want to encourage any development as I am not a real user) is there a server-less embeddable version that perhaps just saves/loads locally with a javascript API for use in other apps?

Yes, but there is more than that. Actually there are 6 types of deployments of Schemio

1. Self-hosted, there is even a docker container available (https://hub.docker.com/r/binshu/schemio/tags). It does not have authorization and user-management, stores all diagrams on a file system. But it allows you to run server in write and read-only mode

2. https://schem.io - a service for collaborative editing and sharing of diagrams. This is obviously a closed-source for now and it uses the open-source frontend of Schemio

3. Schemio as a js library. Although I am not really releasing it to npm, just hadn't the time to work this out. But there is an option to build a js lib that lets you use Schemio as a Vue component. That's actually how I made it work on https://schem.io

4. https://schemio.app - Google Drive based frontend. All your diagrams are stored on Google Drive. Obviously you cannot share your diagrams, as they are only available to you. This is completely open-sourced and you can even build it yourself with npm

5. Static deployment. If you use option 1, you can export all of your diagrams into a static deployment and even host it on Github pages.

6. Standalone player of Schemio that lets you embed a single diagram on your website

I actually forgot about the 7th option - desktop app built with Electron. Unfortunately it's been broken for a while and the electron build fails with some weird error message. I just didn't have enough time to look into it since I am currently a single developer working on it.

That’s amazing!

Hats off to you for getting as far as you have, and don’t sweat the stuff you haven’t been able to get to yet. Nobody (hopefully) expects you to freely share the code you write in any sort of expected time frame.

These things take as long as they take :)

Is it possible to use programmatically? Basically I've been wanting to create an HDL diagram (for FPGA development) from source code to visualise the block interactions. It would be great to have a bit of interaction with the blocks that are created. No other tool I've seen can really do what's wanted.

Do you mean diagrams as code? something like PlantUML https://pdf.plantuml.net/1.2020.22/PlantUML_Language_Referen... ?

If that's what you mean, then no. I do have plans to work on this in the future, but I am not sure when I'll get the time for that.

Or do you mean just generating a diagram and posting it to Schemio programatically? This is possible, but it's not documented.

All diagrams are stored in JSON by the way and the structure is quite straightforward, so it shouldn't be too difficult to generate it yourself

I'm not sure honestly. I basically want to connect nodes with arrows and lines and have the resultant thing look sensible, and ideally interactive.

Oh, I forgot about another aspect of Schemio. You can make use of scripts and functions using SchemioScript language. Not sure if that is going to be helpful for your case, but you can take a look at this demo: https://schem.io/projects/schemio-demo-2tABbv50x2tGRHpS/docs...

If you go to edit mode and select the "Ball" object (in the top hiearchy), then go to behavior panel, you will find that it has a "script" action in the "Play" event. You can take a look at how I implemented that scene and perhaps get some insights for yourself.

Also I had a small section about SchemioScript in this article: https://medium.com/@ivan.ishubin/interactive-diagrams-for-co...

I use it when I need to build complex templates or interactive learning demonstrations like on Brilliant. For example a friend of mine is preparing similar interactive demos with Schemio for kids at school.

Another thing that Schemio has is the concept of classes, functions and arguments bindings. Unfortunately I did not have a chance to write an article or prepare a video for this. But the idea is that you can prepare a class, with complex behavior and even its own configurable arguments, and then you can select any object on the scene and specify that it uses that class. Again, I don't know your exact situation, but just laying out the options

That looks cool, thanks!

Maybe something like JointJS (https://www.jointjs.com/demos) or LiteGraph.js (https://github.com/jagenjo/litegraph.js) or DiagramMaker (https://awslabs.github.io/diagram-maker/?path=/story/docs-in...)

Isn't this normally particle at synthesis time?

If you want open source alternatives, I remembered seeing now a little while ago this https://blog.eowyn.net/netlistsvg/ but never tried it myself, you might give it a go.

I love the way you can zoom in for a diagram with more detail and them easily zoom back out. This is what I wanted from Obsidian but it isn't quite as slick.

This idea came to me after my first on-call, when I had to quickly figure out what is going on in a distributed system of 200+ micro-services. That's why I focused on embedding documentation into a diagram and being able to zoom into the parts of a complex system as much as you can. So that you stay focused on the entire picture. The alternative is to jump between multiple Google Docs/Wiki/Readmes for multiple services and read tones of text.