Heslab

Offline Calculator Toolbox. Fast calculations. Private by design. Works offline.

Heslab is a practical collection of calculators and conversion tools designed for everyday use. It brings together useful tools for finance, crypto, everyday calculations, and unit conversions in one simple browser extension. Finance tools help with common calculations involving profits, margins, savings, interest, loans, discounts, taxes, and other financial values. Crypto tools provide calculations for common scenarios such as profit and loss, average purchase price, target price, break-even values, dollar-cost averaging, and transaction fees. Heslab also includes everyday tools for dates and age calculations, along with conversions for common measurement and digital storage units. Privacy-focused by design Calculations are performed locally within the extension. Heslab does not use external calculation APIs, analytics, tracking, or remote calculation services. No account is required, and the extension is designed to work offline. Heslab is developed by 42V Labs. Languages: English and Turkish.