About Toolssok

Toolssok is a collection of small, single-purpose calculators that run entirely in your browser.

What this site is

Most online calculators are buried in ads, ask you to sign up, or send your input to a server so it can be logged. Toolssok is the opposite: each tool is one page, the maths runs in JavaScript on your own device, and no value you type ever leaves the browser.

The site began in Korean, covering everyday situations — take-home pay, severance, property tax, due dates, and so on. The English section starts with display and screen tools, where the maths is universal and does not depend on any country's rules.

How the tools are built

• No frameworks. Plain HTML, CSS and vanilla JavaScript. Pages are small and load fast.
• No external scripts beyond Google Analytics and AdSense. No CDN libraries, no trackers embedded in the tools themselves.
• Nothing is uploaded. Inputs stay in the browser. Some tools remember your last entry in local storage so you do not have to retype it — that data stays on your device too.
• Explained, not just answered. Each tool shows the formula it used, so you can check the result rather than trusting it blindly.

Accuracy

The calculations are straightforward and testable, and results are cross-checked against the Korean versions of the same tools. That said, they are provided for reference. Where a tool involves a standard that changes over time or varies by manufacturer, the page says so.

Contact

Corrections, bug reports and suggestions are welcome at contact@toolssok.com. If a calculation looks wrong, please include the numbers you entered — that makes it much easier to reproduce.