getguesstimate/guesstimate-app

Health v2 · maintenance only

Adoption not part of the score

2367 stars · 128 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Guesstimate is a web-based spreadsheet-like tool for creating Fermi estimates using Monte Carlo simulation. Users enter ranges and distributions as cell values, and it runs 5000-sample simulations to produce confidence intervals for computed metrics.

Use cases

• estimate uncertain quantities with confidence intervals
• run monte carlo simulations on spreadsheet-like models
• build fermi estimates with ranges instead of point values
• propagate uncertainty through mathematical models
• visualize probability distributions of calculated metrics
• model business or scientific forecasts with uncertain inputs

When to choose

• you need uncertainty-aware estimates rather than single point values
• you want an Excel-like interface with distributions as inputs
• you need quick quantitative modeling without writing code

When to avoid

• you need exact deterministic calculations rather than sampled estimates
• you require advanced spreadsheet features like imports, macros, or collaboration
• you need high-performance simulation with millions of samples

Facets

application · maturity maintenance

simulation data-visualization math data-science analytics developer-tools mathematics cross-platform monte-carlo fermi-estimation spreadsheet uncertainty typescript react web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="getguesstimate/guesstimate-app")