Why we built KokoroFlow
Everyday calculations should not require an account, a complicated spreadsheet, or a sales call. Our goal is to make practical estimates easy to understand on both desktop and mobile devices.
Who runs KokoroFlow
KokoroFlow is an independent site built and maintained by Verno Yang. The tools are designed to run in your browser, so the numbers and files you enter stay on your device. You can follow the project on GitHub.
How the site is funded
Every tool is free to use. The site is supported by advertising (Google AdSense) and by Amazon affiliate links on some pages — see the Affiliate Disclosure. Ads and affiliate suggestions never change a calculation result.
How our tools are created
Each calculator states its assumptions, shows the important result details, and identifies major limitations. When a calculation depends on public rules or official rates, we link to relevant sources and review time-sensitive inputs.
Beyond calculators
We also publish practical guides that explain the math behind the calculators, with worked examples and links to official sources.
Our editorial principles
- Write for people first, not just search engines.
- Keep advertising visually separate from calculator controls.
- Do not present estimates as guaranteed outcomes.
- Correct material errors when they are identified.
- Respect visitors’ privacy and minimize unnecessary data collection.