23 free tools
Free A/B Testing and CRO Tools
Plan experiments, verify results, optimize assets, create lightweight widgets, and turn test ideas into a prioritized roadmap.
Calculators
3 toolsSample Size Calculator
Find the visitors needed per variant before an experiment can detect the lift you care about.
Duration Calculator
Turn required sample size into a run-time estimate using daily traffic and number of variants.
Significance Calculator
Check completed control and variant counts with a two-sample conversion-rate test.
Image Optimization
6 toolsImage Compressor
Compress JPEG, PNG, and WebP assets locally before using them in tests or landing pages.
Shopify Image Compressor
Resize product, collection, and hero images before uploading to Shopify themes.
Ecommerce Image Optimizer
Prepare PDP, gallery, collection, and campaign images for faster ecommerce pages.
Product Image Compressor
Shrink product photos for product pages, marketplaces, ads, and email blocks.
WebP Converter
Convert JPEG and PNG files to WebP in the browser with optional resizing.
Amazon Image Compressor
Resize listing, secondary, A+ content, and ad images before Seller Central upload.
On-page Widgets
2 toolsTemplates & Resources
4 toolsTest Result Image Generator
Combine control and variant screenshots into a clean result image for reports and social posts.
Dynamic UTM Templates
Copy consistent paid-media UTM templates for Google, Meta, TikTok, Pinterest, and Microsoft Ads.
Ecommerce CRO Checklist
Work through 100 conversion checks across PDPs, cart, checkout, trust, UX, and analytics.
A/B Test Playbook
Browse ecommerce test ideas by page, impact, effort, and primary learning.
Experiment Planning
8 toolsHypothesis Generator
Turn an experiment idea into a structured hypothesis, title, and success criteria.
Design Hypothesis Generator
Describe control and variant designs to create a test hypothesis, rationale, and risk checklist.
Headline Generator
Generate headline variants from your product, audience, benefit, and tone.
MDE Calculator
Translate baseline and target conversion rates into absolute-point and relative lift targets.
Conversion Rate Calculator
Calculate conversion rate, remaining conversions to target, and required visitor volume.
Sample Ratio Mismatch Checker
Detect suspicious traffic allocation drift between intended and observed variant splits.
Revenue Impact Calculator
Estimate incremental monthly revenue from traffic, conversion lift, and average order value.
Test Prioritization Calculator
Score experiment ideas with impact, confidence, ease, reach, and learning value.