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We built an uncomplicated calendar tool for low-fidelity planning

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My partner and I do a lot of planning around things like holidays and trips, which involves a mix of firm, tentative, and overlapping plans, and normal calendars are the wrong fidelity for that kind of planning. We often found ourselves drawing on top of screenshots of calendars with tools like Miro or even printing out calendars we could draw on.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...

HN · launched Dec 15, 2025 · 5 upvotes (top 90%) · 0 views

Niche: daily planner apps · 188 launches, 13 in the last 7 days ▼ -32% · Explore this niche →

Category and tags

  • Horizontal
  • Workflow automation
  • Prosumer
  • Not AI
  • Commercial product

Visit website ↗ Source listing ↗

Could you build this?

Yes A low-fidelity planning calendar is primarily a frontend canvas or grid interface with custom event blocks, easily vibe-coded using standard React libraries and Supabase or localStorage.

Discussion

2 comments analyzed.

Competitors mentioned: AI Navigator

Competitors

Other products that read as similar to this one : 60 launches clear the similarity bar, closest 8 shown.

Attention rank: #57 of 61 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 43 days after the earliest competitor.

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