Free Analytics, attribution & CRO Tools

UTM, GA4, A/B tests, funnels and unit economics. 17 free tools, no sign-up.

UTM Builder Create clean, consistent campaign links with this UTM builder for GA4, with channel presets, bulk tagging and a QR code for print. In your browser UTM Parameter Checker Audit tagged links before launch with this UTM checker, which parses each URL and flags missing, messy or inconsistent UTM parameters. In your browser QR Code Generator Create static QR codes for links, WhatsApp, phone, email or Wi-Fi with this free QR code generator, and add UTM tags to measure offline campaigns. In your browser A/B Test Significance Calculator Find out whether a test result is real or noise with this A/B test calculator, and plan the sample size and duration your next test needs. In your browser GA4 Event Builder & Naming Checker Plan GA4 custom events that follow Google's naming rules with this GA4 event builder, then copy gtag.js or dataLayer code and export a tracking plan. In your browser Marketing Attribution Model Calculator See how credit shifts between channels with this attribution model calculator, comparing five common models on your own conversion paths. In your browser Conversion Funnel Calculator Find where you lose the most people with this conversion funnel calculator, which charts each step and estimates the revenue from fixing the worst leak. In your browser Customer Acquisition Cost (CAC) Calculator Work out what it really costs to win a customer with this CAC calculator, showing blended, marketing-only and paid customer acquisition cost. In your browser Customer Lifetime Value (CLV) Calculator Estimate how much a customer is worth over the whole relationship with this CLV calculator, based on gross profit rather than revenue alone. In your browser LTV to CAC Ratio Calculator Check whether growth pays for itself with this LTV to CAC ratio calculator, which also shows how many months it takes to earn back acquisition cost. In your browser Marketing ROI Calculator See whether marketing really pays back with this marketing ROI calculator, which compares ROI on revenue with ROI on gross profit. In your browser Revenue Per Visitor Calculator Measure what each visit is worth with this revenue per visitor calculator, then compare the effect of more traffic with a higher RPV from CRO. In your browser Cart Abandonment Rate Calculator Put a rupee figure on abandoned carts with this cart abandonment rate calculator, and see what cutting abandonment by a few points could be worth. In your browser Form Abandonment Rate Calculator Measure how many people start your form but never submit it with this form abandonment rate calculator, and what those lost leads are worth. In your browser Marketing Budget Calculator Plan spend with this marketing budget calculator: set a share of revenue, split it across channels and see annual and monthly amounts instantly. In your browser Conversion Rate Calculator Find your conversion rate and the revenue uplift from improving it with this free conversion rate calculator for websites, landing pages and ads. In your browser SEO ROI Calculator Estimate what an SEO investment could return with this SEO ROI calculator, from extra organic visits to conversions, revenue and ROI. In your browser

About analytics, attribution & cro tools

Good decisions start with clean data. The tracking tools in this group help you tag campaigns consistently with UTM parameters, check tagged links for mistakes, plan GA4 events that follow Google's naming rules and create QR codes that carry campaign tags offline.

The CRO and unit-economics tools then help you read the numbers: test whether an A/B result is statistically significant, find the biggest leak in a funnel, compare attribution models, and work out CAC, lifetime value, LTV:CAC, revenue per visitor and marketing ROI. Use tracking tools before a campaign launches and the calculators when reviewing results. All of them run in your browser.

Frequently asked questions

Why do UTM parameters matter for GA4?

GA4 uses source, medium and campaign values to group traffic into channels. Untagged or inconsistently tagged links, such as mixing Facebook and facebook, split your reports and can push visits into Unassigned or the wrong channel. A shared UTM convention and a quick check before launch keep reports clean.

How long should an A/B test run?

Run it until you reach the sample size planned in advance, and for at least one full weekly cycle so weekday and weekend behaviour are both included. Stopping as soon as a result looks significant increases the chance of a false winner. The A/B test calculator can estimate the sample size and duration you need.

What is a healthy LTV to CAC ratio?

A ratio around 3:1 is a commonly quoted rule of thumb, but the right level depends on your cash position, payback period and growth plans. Below 1:1 you lose money on each customer. Track the ratio over time and alongside CAC payback months rather than relying on one number.