Our other projects
Ten small sites built by the same person, all free and all designed to answer one question quickly. If a tool you need is not here, it may be on one of these.
Invoices, quotes and NDAs as PDF, in the browser
Document generators for freelancers and small businesses — invoices, purchase orders, receipts, timesheets — plus tax and rate calculators.
iznkit.com99 free calculators, no signup
Finance, health, maths, conversions and home DIY — the calculator you need is probably one of the ninety-nine.
calclumen.com69 crypto calculators and a tax report
Position sizing, liquidation price, impermanent loss, staking yield — and capital gains reports for twelve countries.
thecryptotools.comWhat salary keeps your life the same after a move
Compare the cost of living between cities worldwide and work out the salary a relocation actually requires.
costtrek.comTest your computer, one part at a time
Browser diagnostics with nothing to install: dead pixels, backlight bleed, refresh rate, colour and motion tests.
testsweep.com59 browser games, nothing to download
Puzzle, arcade, sports and classic board games that start instantly on any device.
izngames.comHealth without the myths
Evidence-based articles and 16 calculators on nutrition, sleep, fitness and metabolism.
24zdorovie.comAll of these are run by the author of IZN Tools. None of them require an account to use, and none of them upload your files.