We're both product designers, and so we're used to working in low fidelity tools like Excalidraw and FigJam. We decided to try and make a low-fidelity equivalent for calendars, and built Walnut. It's just lines and stickies, with a few different styles, no events or times.
Walnut has two versions: the super simple, localstorage-based version at letswalnut.com, which you can just pop open any time. There's also a "workspace" version which lets multiple people work on the same calendars with multiplayer collaboration, and persists the calendars long-term.
It's still rough around the edges and needs more design refinement, but we've been using it extensively personally (and my team's using it at my work for planning purposes). It's not right for everyone, but for those who like to plan this way, we think it's helpful. Curious to hear any thoughts!
Right now anyone can use the localstorage-based version. If you'd be interested in trying out the persisted/collaborative version, drop your email in the waitlist[1] and I'll send you an invite to sign up!
[1] https://docs.google.com/forms/d/e/1FAIpQLSetOC_hY54_DBfnPCmW...
