Free tools for marketers and analysts. Calculate what your campaigns are actually costing, validate your UTM setup before it corrupts your data, check whether an A/B test winner is real and see what you are trading away by using a heavier analytics tool.
No account required. Everything runs in your browser.
Calculators
Conversion rate calculator: Calculate your conversion rate, the traffic you need to hit a goal, and what a small improvement is actually worth in extra conversions per month.
A/B test significance calculator: Check whether the winner of your A/B test is real or random noise, and how many visitors your test needs before you can trust it.
Ad cost calculator: Enter your campaign numbers once and calculate your CPC, CPM and CPA alongside derived metrics like click-through rate and conversion rate.
Cookie banner traffic loss calculator: Estimate how many visitors are invisible to Google Analytics because of consent banner declines, and what that does to your reported numbers.
URL tools
UTM builder: Generate correctly formatted UTM-tagged URLs for your campaigns without doing it by hand.
UTM checker: Paste a tagged URL to validate it, spot naming inconsistencies and get a clean corrected version ready to copy.
Comparisons
Script size comparison: Google Analytics loads 135KB of JavaScript for every new visitor. Plausible loads 2.5KB and needs no cookie banner on top.