Grace Ge

Grace Ge

Building systems for better decisions.

Building systems for better decisions.

Decision Systems Toolkit

Decision Systems Toolkit

A/B Test Calculator

A/B Test Calculator

Run statistically sound A/B tests.

Interpret results with confidence.


A lightweight offline toolkit that runs entirely in your browser.

No installation.

No account.


Yours to keep.

Run statistically sound A/B tests.

Interpret results with confidence.


A lightweight offline toolkit that runs entirely in your browser.

No installation.

No account.


Yours to keep.

Download Free Toolkit

What's Included

What's Included

Four practical tools for common A/B testing decisions.

Four practical tools for common A/B testing decisions.

You join the pilot, prepare your foundation, build the system live, then receive a personalized operating manual so you can maintain and use the system independently.

You join the pilot, prepare your foundation, build the system live, then receive a personalized operating manual so you can maintain and use the system independently.

01 · Mean Comparison

Compare continuous metrics such as revenue, order value, or time on page.

02 · Proportion Comparison

Compare conversion rates and other binary outcomes.

03 · Sample Size

Estimate how many observations you'll need before running a test.

04 · Statistical Power

Understand whether your experiment has enough power to detect a difference.