Online collaborative drawing, for, e.g. doing mathematics online or general diagrams. Many tools claim to do this, but I have not managed to have a truly satisfactory experience yet, although I have committed not much time to it. I was hoping for a slam-dunk best option. I suspect that most of the options are going to need some kind of stylus input to be any use, at least for the writing-heavy workflows I care about.
Here are some candidates.
Excalidraw
An open source option that promises collaboration and end-to-end encryption is Excalidraw (source.)
Virtual whiteboard for sketching hand-drawn like diagrams. Collaborative and end-to-end encrypted.
This has little specific math support, but lots of virtual whiteboard affordances — we can draw freehand lines but also shapes and text and so on. Other people can simultaneously draw stuff on te same board.
I think it is the only open-source option here (node+typescript). Cool feature: it can be embedded in a react component, or in a third party app.
Because this is free, competently done and doesn’t require arsing around with a credit card, Excalidraw is my go-to option.
There is a version with extra work teams features called Excalidraw+ (USD7/person/month).
Freeform
If my collaborators are in the apple system, freeform is pretty good. See Apple launches Freeform: a powerful new app designed for creative collaboration.
Figjam
FigJam is made by Figma who have a very profitable business based on being pretty good at real-time collaboration, so maybe that is worth trying. Point of differentiation with excalidraw is EVEN MORE STUFF. Virtual stick-it notes, virtual stickers, plugins. USD3/editor/month for the Figjam-only plan (USD12/editor/month for the Figma plan which includes Figjam).
Mathcha
Matcha board, looking sexy
Mathcha is not quite a whiteboard but some kind of prototyping-style app which aims to do mathematics online in particular. This is the option that benefits from stylus input least;. It is not a whiteboard in the classic sense, where we draw lines. Equations are entered by markup with smart UI to make it fast. Not particularly realtime collaborative, but more of an old-school share-a-link-to-see-my-work kind of thing. Nonetheless they have worked so hard on that UI that it feels useful.
Online version is free; offline desktop app is USD30/year.
Miscellaneous options
There are many others.
Interactive scratchpad Collusion (USD20/user/month), Bitpaper (approx USD1/page) is a collective sketch page. desmos is an online collaborative graphing calculator. Mural (USD20/user/month). Scribble Together seems to have the most powerful free plan of those.
There are other options which are offered only on asinine enterprise pricing (e.g. Blackboard Collaborate) which I will not trouble with here.
Point a camera at a physical whiteboard
Not very collaborative, but satisfyingly tactile. What is the apotheosis of whiteboards for video transmission?
Candidate: Cristovao Cordeiro and Elisa Valkyria’s $100 Lightboard.
Other deliberation tools
Sometimes we want something that is a little more structured than just a diagram editor, incorporating brainstorming or voting tools.
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