Free Tools
Tools we actually use, free for everyone
Every tool here started life as something we needed at our own desks — a spreadsheet, a sticky note, a bit of mental arithmetic done fifty times. They run entirely in your browser, ask for no account, and cost nothing. Pick one and get the number you came for.
UTM Builder
Build clean, trackable campaign URLs with the right UTM tags — presets, one-click copy, and a recent-links history.
Open tool → 02 AdvertisingROAS & Break-Even ROAS Calculator
See your return on ad spend, then the exact break-even ROAS and max CPA your product margins can support.
Open tool → 03 EcommerceProfit Margin Calculator
Profit per unit, gross margin and markup from any cost and selling price — and the difference between the two, finally clear.
Open tool → 04 AdvertisingMeta Ads Calculator
Turn raw campaign numbers into CPM, CPC and CTR, or estimate what a daily budget will buy before you spend it.
Open tool → 05 FreelancingInvoice Generator
A clean invoice you fill in right in the browser — line items, discount, tax — then print or save as a PDF. No sign-up, no watermark.
Open tool →Why free?
Because we kept rebuilding the same helpers for clients and for our own campaigns, and a page that answers one question well beats a spreadsheet buried in a drive folder. If a tool saves you a few minutes every week, it has done its job. Pair them with the guides on this site — the calculators give you the number, the articles explain what to do with it.
Nothing you type into these tools is sent to us or stored on a server. The maths happens on your device, and when you close the tab, it is gone. Found a number that looks wrong, or a tool you wish existed here? Tell us via the contact page — the list grows from reader requests more than from our own plans.