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A/B Buddy for iOS

By Evan Miller Free

Developer's 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

Full Specifications

What's new in version 1.0.1


Release October 29, 2019
Date Added October 29, 2019
Version 1.0.1

Operating Systems

Operating Systems iOS
Additional Requirements Requires iOS 10.0 or later. Compatible with iPhone 5S, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, iPad Pro (12.9-inch), iPad Pro (12.9-inch) Wi-Fi + Cellular, iPad Pro (9.7â??inch), iPad Pro (9.7-inch) Wiâ??Fi + Cellular, iPad (5th generation), iPad (5th generation) Wiâ??Fi + Cellular, iPad Pro (12.9â??inch) (2nd generation), iPad Pro (12.9â??inch) (2nd generation) Wiâ??Fi + Cellular, iPad Pro (10.5â??inch), iPad Pro (10.5-inch) Wiâ??Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro (12.9-inch) (3rd generation), iPad Pro (12.9-inch) (3rd generation) Wi-Fi + Cellular, iPad mini (5th generation), iPad mini (5th generation) Wi-Fi + Cellular, iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular, iPad (7th generation), iPad (7th generation) Wi-Fi + Cellular, and iPod touch.


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