UTM builder and link checker
Build tagged campaign URLs, or audit a link you already have.
Takes: A destination URL and your campaign names
Open
Free tools
Small tools that answer one question each.
Campaign builders and marketing calculators, free and without an account. Every one of them runs entirely in your browser: there is no server call, nothing is stored, and nothing you type is ever sent to us. That is not a policy, it is how they are built, and you can confirm it in your network tab.
Do I need a cookie banner?
Four questions that tell you whether consent is actually required.
Takes: Four yes or no answers about your site
OpenCookie banner traffic loss calculator
See how many visitors your consent banner hides from your analytics.
Takes: Monthly visitors and your consent decline rate
OpenConversion rate calculator
Conversion rate, plus the traffic needed to hit a target.
Takes: Visitors and conversions
OpenBounce rate calculator
Bounce rate from your session counts, plus the GA4 equivalent.
Takes: Total sessions and single-page sessions
OpenAd cost calculator
CPC, CPM, CPA, CTR and ROAS from one set of campaign numbers.
Takes: Ad spend plus any counts you have
OpenRevenue per channel calculator
Revenue per visitor by channel, and which one is undervalued by traffic.
Takes: Visitors and revenue for each channel
OpenCAC payback calculator
CAC, payback months, LTV and the ROAS you have to beat.
Takes: Spend, new customers, revenue, margin and churn
Open
Why they are free
No account, no email, no catch.
Free tools are usually a trade: you get the calculator, the site gets your email address and a tracking profile. These are not that. There is no form in front of them, no gate after the result, and no request for an address to send it to.
They also do not phone home. Each tool is a small piece of JavaScript that runs on the page you are already on. Type a client's campaign URL into the builder and it stays in your tab, because there is nowhere for it to go. A company that argues sites should not collect data they do not need would look foolish collecting data it does not need.
What we get is the honest version of the trade: if a tool is useful, some people will look at what else we make. That is the whole funnel.
sonex itself works the same way. No cookies, no fingerprinting, no consent banner, and a free plan that does not expire.