Free CRO tools
Free tools to plan and read your conversion tests.
- A/B test calculatorWhich version wins, by how much, and how sure you can be.
- A/B test duration calculatorHow many visitors your test needs, and how many days it will run.
- Conversion lift calculatorWhat a higher conversion rate is worth, per month and per year.
- Landing page checkerYour page as Polish reads it, in one pass.
- Headline generatorFour rewrites of your headline, one per kind of visitor.
- CTA generatorFour button labels, one per kind of visitor.
- UTM builderClean campaign links, and how Polish reads the visitors who click them.
- UTM checkerThe tags that quietly split your reports in two.
- Social preview checkerThe card each platform shows when your link is shared.
Your website rewrites itself until it converts.
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