# NapkinBook

Computational whiteboard combining diagrams, live math, and probability for forecasting.

- Category: Productivity
- Pricing: Contact for pricing
- Tags: Business Forecasting, Data Analysis, Visualization
- Website: https://desk.napkinbook.com/?via=aigregator
- Aigregator page: https://aigregator.com/tools/napkinbook
- API: https://x402.aigregator.com/v1/tools/napkinbook

## Overview
NapkinBook is a free, browser-based computational whiteboard for people who make data-driven decisions. Rather than separating diagramming from calculation, it lets users build reasoning chains directly on a canvas: circles hold values, squares perform math operations, and wires connect the pieces together, so a forecast or model becomes a visual, inspectable structure instead of a hidden spreadsheet formula.

It's built for forecasters and analysts who want to reason through uncertainty visually — the tool explicitly supports probability modeling alongside plain arithmetic — and who need to bring in outside data via SQL queries or direct data import rather than manual entry. Its creator is described on the site as a 'superforecaster who's worked with Microsoft AI,' though no company name or exact launch date is given.

Boards can be created immediately with no signup, and the tool supports live, end-to-end encrypted collaboration and a presentation mode for walking others through a model. Every feature — canvas, math, probability, SQL queries, encryption, and presentation mode — is currently free with no paywall. One limitation: because pricing is not mentioned at all beyond 'free right now,' there's no indication of what, if anything, will eventually be monetized, which makes its long-term availability harder to judge.
## Key Features
- Visual reasoning canvas with live calculations
- Probability modeling
- SQL query and data import
- End-to-end encrypted live collaboration
- Presentation mode

## Use Cases
- Build a visual forecast model instead of a spreadsheet
- Collaborate on a probability-based decision with a team
- Present a data-driven model interactively

## Alternatives
- [Miro](https://aigregator.com/tools/miro-ai)
- Causal

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Source: Aigregator — AI tools directory. https://aigregator.com/tools/napkinbook