About Doia
Free, fast, honest tools — built because the alternatives were none of those things.
Why this exists
Search for any calculator online and you will find the same pattern: a page buried under ads, a form that demands your email before showing a result, a 'free' tool that turns out to be a trial. The calculation itself takes ten lines of code. Everything else is friction placed between you and an answer. Doia was built to remove that friction. Every tool here does one thing, does it immediately, and does not ask you for anything in return.
What you will find
Doia hosts 100 tools across five areas: • Crypto & Forex — liquidation prices, position sizing, impermanent loss, Zakat on digital assets, gas fees, and more • Finance — loan amortisation, compound interest, salary after tax, debt payoff strategies, net worth tracking • Utilities — password generation, JSON formatting, regex testing, timezone conversion, unit converters • YouTube — thumbnail downloads, SEO auditing, revenue estimation, sponsorship pricing • Media — image compression, format conversion, colour palettes, watermarking All of them are free. None of them require an account.
How we think about your data
Most of our tools never send your input anywhere. Your image compressor runs in your browser. Your password generator runs in your browser. Your salary, your portfolio, your trade sizes — they exist in your tab's memory and nowhere else. This is not a marketing position. It is an architectural one: we did not build the infrastructure to collect your data because we did not want the responsibility of holding it.
On live data
Several tools pull live information — exchange rates from the European Central Bank, blockchain data direct from the network, YouTube statistics from the official API. We do this because a currency converter with last month's rates is not a currency converter; it is a lie with a nice interface. Where we cannot get live data, we use published official figures and say so — tax brackets from revenue authorities, fee schedules from the payment processors themselves, CPI data from national statistics offices.
Three languages
Doia is available in English, Arabic, and Spanish. Not machine-translated — written properly in each. The Arabic web in particular is underserved for tools like these. A Zakat calculator that handles cryptocurrency should exist in Arabic, and until recently it largely did not. That gap is part of why this site was built.
How it is funded
Advertising, through Google AdSense. That is it. We do not sell your data — we do not have it. We do not sell premium tiers. We do not gate features behind an email. Ads pay for the servers, and in exchange the tools stay free for everyone. If ads bother you, an ad blocker will not break anything. The tools will work exactly the same.
Get in touch
Found a bug? Spotted a formula that looks wrong? Want a tool that does not exist yet? We genuinely want to hear it — email contact@doia.io. Corrections in particular are welcome; a calculator that is wrong is worse than no calculator at all.