Napkinbook
an infinite computational whiteboard/dashboard
Details
- External ID
- 48766612
- Source
- HN
- Company
- —
- Product
- Napkinbook
- Website domain
- napkinbook.com
- Launched
- July 2, 2026
- Cohort
- —
- Upvotes
- 5
- Upvotes percentile
- 0.1081242532855436
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Description
I am a superforecaster and napkinbook is a tool I have used to do forecasts and to organize my thoughts and to plan for the future. I built this originally so I could make videos on prediction markets and break down my ideas so I wanted to share it with all of you :)
Enrichment
- Theme
- interactive simulations and creative experiments
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Prosumer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- infinite computational whiteboard and dashboard
- Manually corrected
- False
Could you build this?
Partial A collaborative infinite canvas with basic diagrams is vibe-codeable, but integrating a reactive computation engine, live DuckDB/Wasm SQL queries, Monte Carlo simulations, and probabilistic forecasting models requires solid statistical and data systems architecture.
What it would actually take: The client uses SvelteKit and HTML5 Canvas or SVG (such as PixiJS or custom WebGL) with CRDTs (Yjs) backed by Supabase and a WebSocket sync server. The computation core needs an embedded analytical engine (like DuckDB-Wasm) running user SQL queries locally, integrated into an execution graph that evaluates statistical distributions, Latin hypercube sampling for Monte Carlo runs, and reactive fan-chart visualizations in real time.
Discussion
1 comment analyzed.
Concerns raised: Not optimized for mobile/phone use
Competitors
Other products that read as similar to this one — 7 launches clear the similarity bar.
Attention rank: #8 of 8 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 142 days after the earliest competitor.
- Napkinbook, a smart canvas for discovering, and sharing insights · hn · 2026-08-14 · 5 upvotes · similarity 0.62
- Napkin Math · ph · 2026-06-10 · 192 upvotes · similarity 0.44
- Napkin Math - hyper-personalized AI food journal · yc · 2026-05-27 · 25 upvotes · similarity 0.42
- I made paperboat.website, a platform for friends and creativity · hn · 2026-02-10 · 81 upvotes · similarity 0.39
- Whiteboard · ph · 2026-09-11 · 1 upvotes · similarity 0.32
- Mondael.com · hn · 2026-07-07 · 7 upvotes · similarity 0.31
- tomorrowread.com · ph · 2026-09-30 · 1 upvotes · similarity 0.31
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.