Who should use NapkinBook?

NapkinBook is a consumer product built for analysts and decision makers.

Does NapkinBook have a free plan?

Yes — NapkinBook is free to use.

What platforms does NapkinBook run on?

NapkinBook runs on the web and the command line.

Is NapkinBook still active?

Unverified. NapkinBook has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to NapkinBook?

Similar projects tracked by PulseGate include Focus Wall, Password.File, and INSTITUTO KLEICY ABREU.

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NapkinBook

napkinbook.comProductivity & Work

NapkinBook is a browser-based computational whiteboard designed for people who make data-driven decisions. It allows users to input evidence, update beliefs, and recompute probabilities in real time. The tool is local-first, free to use, and requires no account, making it ideal for analysts and decision makers who value privacy and efficiency.

FreeWebCLICloud-managed

Visit napkinbook.com

Overview

5 features

In the Productivity & Work space, NapkinBook takes a focused approach. It focuses on making data-driven decisions easier by providing a computational whiteboard that updates beliefs and calculations in real time. It is built as a consumer product for analysts and decision makers. It is available for free. It runs on the web and the command line.

NapkinBook first shipped in 2024. Among its 5 catalogued features are computational whiteboard, local-first storage, and no sign-up required.

Summary written by a language model from the project’s public pages.

Computational whiteboard
Local-first storage
No sign-up required
Evidence tracking
Probability calculation

Built with & integrations

Framework

SvelteKit

Hosting

Vercel

Runs on

BrowserCLICloud-managed

Detected from

Vercel: x-vercel-id header · x-vercel-cache header
SvelteKit: data-sveltekit- in the HTML · /_app/immutable/ in the HTML

Trust & compliance

Verified signals

HTTPSFree tier

Indexing history

What PulseGate has recorded for this listing

Indexed15 Jul · 20:03 UTC
Yes, your combo bet on Kalshi probably sucks verified against its public source
Source: PulseGate · Open

Frequently asked questions about NapkinBook

What does NapkinBook do?: NapkinBook focuses on making data-driven decisions easier by providing a computational whiteboard that updates beliefs and calculations in real time. It is catalogued under Productivity & Work on PulseGate.
Who should use NapkinBook?: NapkinBook is a consumer product built for analysts and decision makers.
Does NapkinBook have a free plan?: Yes — NapkinBook is free to use.
What platforms does NapkinBook run on?: NapkinBook runs on the web and the command line.
Is NapkinBook still active?: Unverified. NapkinBook has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to NapkinBook?: Similar projects tracked by PulseGate include Focus Wall, Password.File, and INSTITUTO KLEICY ABREU.Focus Wall Password.File INSTITUTO KLEICY ABREU
When did NapkinBook launch?: NapkinBook first shipped in 2024.

At a glance

Pricing: Free
Platforms: Cli · Web
Languages: English
Built for: analysts and decision makers
Model: B2C
Solves: Making data-driven decisions easier by providing a computational whiteboard that updates beliefs and calculations in real time.

Live coverage

Identity confidence: High · 93.8
Indexed: 15 Jul 2026
Lifecycle: Unverified
Last seen: 15 Jul 2026

Identity audit (12)

Slug: yes-your-combo-bet-on-kalshi-probably-sucks-napkinbook-com
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 15 Jul 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 15 Jul 2026
Canonical URL: https://napkinbook.com/

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