About Story Estimator

A modern, collaborative platform for agile teams to estimate user stories efficiently

What is Story Estimator?

Story Estimator is a real-time collaborative estimation tool designed for agile development teams. It features an intelligent weighted scoring algorithm that helps you estimate user stories with greater accuracy using popular techniques like Fibonacci (1-55), T-shirt sizing (XS-XXL), and Powers of 2 (1-64).

Built with Next.js 16, TypeScript, and powered by Supabase for real-time collaboration, Story Estimator combines ease of use with sophisticated estimation logic to make sprint planning sessions more efficient, accurate, and engaging.

Collaborative

Real-time estimation with your entire team

Multiple team members can join sessions simultaneously and estimate stories together with live updates and instant synchronization.

Fast & Simple

No registration required, shareable links

Create sessions instantly with just a nickname. Share a simple link with your team—they just add their name and join. Automatic session recovery lets you pick up where you left off if you reload the page.

Anonymous Estimation

Prevent anchoring bias in your team

Estimates remain hidden until the host reveals them, ensuring unbiased estimation and encouraging independent thinking.

Intelligent Algorithm

Weighted scoring with risk damping

Answer 5 questions about complexity, effort, risk, capabilities, and clarity. Our algorithm uses weighted scoring (complexity matters most), risk damping to prevent overestimation, and guarantees monotonicity. Or skip questions and select your estimate directly.

How It Works

Create a Session: The host creates a session and selects an estimation method

Invite Your Team: Copy the shareable session link and send it to team members—they just add their name to join

Add Stories: The host adds user stories to estimate

Estimate Together: Each team member estimates independently

Reveal & Discuss: The host reveals estimates and the team discusses differences

Open Source & Free

Story Estimator is completely free to use. Built with Next.js 16, React 19, TypeScript, Supabase for real-time collaboration, and Tailwind CSS v4 for modern styling. Fully tested with 213 automated tests (189 unit + 24 E2E). Designed to make accurate agile estimation accessible to teams of all sizes.