A/B Pre-test Calculator by Speero

Speero's A/B Pre-test Calculator helps you answer vital pre-test questions like MDE, sample size, duration, and more.

A/B Pre-test Calculator by Speero

"A/B Pre-test Calculator by Speero" is a powerful Chrome extension that helps you answer key pre-test questions such as minimal detectable effect (MDE), sample size, and test duration. Input your website’s weekly sessions, conversions, and the number of test variants, or connect with Google Analytics for hassle-free analysis. Designed for easy use, this extension allows you to filter data by URL and supports quick decision-making for your A/B testing needs, all within your browser.
Install from Chrome Web Store

Extension stats

Users: 1,000+
Version: 1.4 (Last updated: 2024-02-08)
Creation date: 2023-08-09
Risk impact: Moderate risk impact
Risk likelihood:
Manifest version: 3
Permissions:
  • storage
  • identity
Host permissions:
  • https://accounts.google.com/o/oauth2/token
Size: 42.19K

Other platforms

Not available on Android
Not available on Firefox
Not available on Edge
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Extension summary

Speero's A/B Pre-test Calculator helps you answer all important pre-test questions like:

— What is the minimal detectible effect I can test for? — How long should I test for considering the effect? — What's the sample size?

— How to use Speero's A/B Pre-test Calculator? —

Type in the number of weekly sessions or users, conversions, and a number of test variants, and see if your website has the capacity to test your ideas.

Or just sign in with Google Analytics and let Speero’s calculator get the results for you.

Speero’s A/B Pre-test Calculator is pre-defined for 2 variants (including control), confidence of 95% and statical power of 80%.

— Why Speero’s A/B Pre-test Calculator? —

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Extension safety

Risk impact

A/B Pre-test Calculator by Speero requires a few sensitive permissions. Exercise caution before installing.

Risk likelihood

A/B Pre-test Calculator by Speero is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.

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Promo images

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