Skip to main content
H/S INDEX   /   Curated corners of the internet   THE WEB IS STILL OPEN
HOW I SEARCHIndependent discovery index
THE H/S DISCOVERY INDEX

EXPLORE THE WEB.

Independently reviewed resources and the paths to original sources.

Find your next source

Filter your curiosity /

SHOWING 1–8 OF 8 REVIEWED SOURCESORIGINAL SOURCES ↗
Calculators & Converters / 01↗

Calculator.net

Use free online calculators for arithmetic, percentages, dates, finance, science, and everyday math problems.

calculator.netREVIEWED / 2026-10-27
Calculators & Converters / 02↗

Desmos Graphing Calculator

Graph functions and equations, plot data points, and explore mathematical relationships in an interactive workspace.

desmos.comREVIEWED / 2026-10-27
Calculators & Converters / 03↗

OANDA Currency Converter

Compare currencies using OANDA Rates™, compiled from market-data contributors and described as daily-average bid and ask rates. Access separate historical lookup tools for past exchange-rate research.

oanda.comREVIEWED / 2026-10-27
Calculators & Converters / 04↗

timeanddate.com Date Duration Calculator

Count days between dates, choose whether to include the final date, and follow related tools for workdays and calendar calculations.

timeanddate.comREVIEWED / 2026-10-27
Calculators & Converters / 05↗

UnitConverters.net

Convert units for length, temperature, mass, volume, speed, energy, and specialized engineering measurements.

unitconverters.netREVIEWED / 2026-10-27
Calculators & Converters / 06↗

Wise Currency Converter

Compare currency values at Wise’s displayed mid-market rates and explore exchange-rate histories for supported pairs.

wise.comREVIEWED / 2026-10-27
Calculators & Converters / 07↗

World Time Buddy

Compare several time zones on one timeline and identify meeting times across cities.

worldtimebuddy.comREVIEWED / 2026-10-27
Calculators & Converters / 08↗

XE Currency Converter

Convert currencies using mid-market reference rates, with tools for tracking exchange-rate changes and reviewing historical data.

xe.comREVIEWED / 2026-10-27

Publication standard: resources are reviewed for usefulness, access, provenance and notable limitations. A listing is never a guarantee of safety or accuracy; examine the original source for critical decisions.