Sorry for (kind of) marketing plug here but I think it will be interesting to you.
We’ve recently built an extension to jupyter-notebooks and jupyter-lab that lets you version checkpoints by clicking a button and then you can browse versions and diff easily:
and I can easily share it with anyone by sending a link like this one.
We’ll be adding new features around this like commenting and stuff and I would love to hear what you think and what you would like to see there.
Anyway, I hope this helps.