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ThinkVault Tools

About ThinkVault Tools

ThinkVault Tools is a free toolbox for finance, stocks and everyday maths. Enter your numbers to compare results and check the method.

Last updated: 19 October 2026

Why we built this

Headline rates leave out fees, compounding, inflation and opportunity costs. Change an input to see how the result changes, then make your own decision.

What’s inside

Work out mortgages, deposits, loan APR and savings IRR; compare stocks, dividends and risk; or use currency, bill-splitting, date, image, PDF and AI prompt tools. Some tools fetch external rates or quotes. Each page explains its scope and limits.

Who makes this

ThinkVault Tools is built and maintained by one designer in Hong Kong using AI tools to help write and review code. Methods and limits are shown on the pages. The site is not owned by a bank, insurer, broker or estate agent. Advertising does not decide formulas or defaults.

Tool options

Add to your home screen

Add to your home screen to open the tools in a standalone window.

Scan the QR code on your phone, open the site and add it to your home screen.

Generating QR code…

https://hkdatalab.com/en

Desktop/Android: if no install button appears, use Install app or Add to Home Screen in your browser menu. Availability depends on the browser.

Some cached pages may reopen offline, but not all pages will work. New pages, updated rates and quotes need a connection.