# A/B Buddy

> Sample Size & Power Calculator

Canonical page: [https://chrome-stats.com/d/id1446129030](https://chrome-stats.com/d/id1446129030)

## Overview

- **ID:** `id1446129030`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Evan Miller
- **Category:** Utilities
- **Rating:** 4.00 / 5 (4 ratings)
- **Version:** 1.1.0
- **Last updated:** 2020-04-14
- **First published:** 2019-01-15
- **Size:** 1.74 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/a-b-buddy/id1446129030)
- **Privacy policy:** [https://www.evanmiller.org/ab-testing/privacy.html](https://www.evanmiller.org/ab-testing/privacy.html)

## Description

If you're planning to run an experiment – either on the web or in real-life – it's critical to collect the right amount data so that you know the experiment results are scientifically valid.

A/B Buddy is a sample-size calculator that helps you design A/B experiments with a quick slide of a finger. It uses a power-analysis formula to tell you exactly how many subjects, or users, that you'll need in an experiment in order to detect a statistically significant difference between two groups. Because if you have too few users in the experiment, you'll never see any difference between "A" and "B"; if you have too many enrolled, the experiment will never end. A/B Buddy tells you exactly the right number.

How does it work? Let's say your current conversion rate is 10%, and you want to see if a proposed change from the design team can boost that number up to 12% – that is, a 20% lift in the conversion rate. Simply pop open A/B Buddy, set the Baseline conversion rate to 10%, and the Minimum Detectable Effect to 20%, and your answer is waiting for you at the top of the screen.

A/B Buddy includes a Share button, which links to a web page displaying your sample size calculation. Your numbers, however, remain 100% private – all the information is stored in the URL fragment, and is never transmitted to any servers.

By default, A/B Buddy uses the most common statistical thresholds: 5% for the significance level (false-positive rate), and 80% for the power level (ability to detect the Minimum Detectable Effect). Power users can adjust these values after unlocking the Pro Features in-app purchase. But most users will find the defaults adequate for their needs.

Questions? Suggestions? Ideas? Feedback is always welcome at emmiller@gmail.com

## Rankings

- #518,842 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1446129030)