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A/B Pre-test Calculator by Speero

Chrome extension by Speero · Productivity · Developer

  • Trader

A Chrome extension in Productivity · Developer with 1 000 users, a small but real audience.

Specific sites only: 1 match pattern.

What the developer says, and 3 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
1 000
Rating
not rated yet
Users, last 16 days
unchanged
Version
1.4
Updated in the store
2024-02-08
Published
2023-08-09
Manifest
V3
Browser access
2 permissions, 1 site pattern

How it has moved

Users
unchanged since 31.08
1k · 2 readings
  1. 2026-08-311k
  2. 2026-09-151k
Users
unchanged since 31.08
1k · 2 readings
  1. 2026-08-311k
  2. 2026-09-151k

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Specific sites only: 1 match pattern.

  • https://accounts.google.com/o/oauth2/token
  • Sign you in with a Google account identity
  • Store data in your browser storage

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

Speero. Listed website: speero.com.

Like this one

Listings the catalog judges closest in what they say they do.

  1. A/B Test Calculator - PMToolKit Describes nearly the same job, smaller audience 3 users
  2. The Experimenteurs Toolkit - Pre/Post test statistics, estimated impact Describes nearly the same job, smaller audience 8 users
  3. McGaw.io AB Testing Tracking Tool Describes nearly the same job, smaller audience 574 users ★ 5.0
  4. Sample Size Describes nearly the same job, smaller audience 14 users ★ 5.0
  5. A/B Test Statistical Significance Calculator Describes nearly the same job, smaller audience 3 users

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

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Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.