Free CRM A/B Testing and Email Templates
CRM A/B Buddy is a free browser-based tool for CRM and email marketing teams. Run statistically valid A/B tests and build production-ready email templates without a data science team or a paid platform.
A/B Test Analyser
Upload your campaign CSV to get z-test significance results, segment balance checks, outlier detection and exportable reports. Everything runs in your browser. No data leaves your device.
- Sample size calculator for one-time sends and automated journeys
- Segment balance checker to validate your audience split
- Outlier detection with Winsorisation for revenue metrics
- Two-proportion z-test with p-value, confidence intervals and relative uplift
- Export results to Excel or copy a plain-text summary
Email Template Builder
Drag-and-drop email builder with 15 block types. Build, preview and export production-ready HTML for Klaviyo, Mailchimp or any ESP. No account required.
- Heading, text, image, button, divider and spacer blocks
- Navbar, footer, product grid, columns and box layout blocks
- Desktop and mobile preview
- Export as plain HTML, Klaviyo or Mailchimp format
- Import and round-trip edit existing HTML emails
Built for lean CRM teams
Both tools are free and require no account. Your data never leaves your browser. Designed for CRM analysts and email marketers who need rigorous results without the overhead of enterprise tooling.
Open the free A/B test analyser or open the email template builder.
Frequently Asked Questions
- What is CRM A/B testing?
- CRM A/B testing is the process of sending two versions of a campaign to different subsets of your audience and measuring which performs better. You change one variable, such as a subject line or CTA, and keep everything else the same so the result can be attributed to that single change.
- Is this tool really free?
- Yes. The A/B test analyser and email template builder are completely free with no account required. There are no usage limits, no trial period, and no credit card needed.
- Do I need a data science team to run A/B tests?
- No. CRM A/B Buddy walks you through sample size calculation, segment balance checking, outlier detection, and statistical significance testing step by step. It is designed for CRM analysts, email marketers, and lean teams who want rigorous results without specialist tooling.
- What file format does the tool accept?
- CSV and Excel (.xlsx) files. Your file needs a CustomerID column, a group column (a for control, b for variant), and at least one metric column such as Opens, Clicks, Transactions, or Revenue. Segment columns are optional.
- Is my data private?
- Yes. The tool runs entirely in your browser. No data is sent to a server, nothing is stored, and closing or refreshing the tab clears everything. You can use it with real customer data without any privacy risk.