Calculators without the ad maze.
776 tools in 13 categories. No accounts, no data collection. Ask Echo to explain complex calculations in plain English.
Every desk, at a glance
Categories from finance calculations to developer utilities. Find what you need.
Most used utilities
The tools that get the most daily traffic.
Estimate take-home pay after federal, FICA, and state tax — for any US state.
Convert between 28 world currencies with live, daily-updated exchange rates.
Compare your FY 2025-26 tax under the new and old regimes side by side.
Estimate your full monthly mortgage payment including PITI, PMI, and HOA.
Recently added tools
The latest tools built and added to the catalog.
combined OG + Twitter Card preview showing how a URL looks when shared on major platforms
generate `<meta name=\"twitter:…\">` tag blocks with card-type preview
fetch a URL and inspect its OG/Twitter Card tags with a social-preview render
build `<link rel=\"alternate\" hreflang=\"…\">` tags for multilingual pages
visually build JSON-LD for Article, Product, FAQ, BreadcrumbList, and LocalBusiness schema types
GUI to build optimised `<title>` and `<meta description>` tags with character-count guardrails
Designed to be private and quiet
No registration, no tracking scripts, no intrusive popups.
Nothing leaves your browser
Calculations run on your device. No inputs are uploaded, logged, or stored — the live tools even work offline.
Fast and ad-light
Each tool ships only its own code and loads instantly. No pop-ups, no CAPTCHA walls, no ten-step funnels.
Echo explains the result
Not sure what a number means? Echo reads what a tool just produced and tells you what to do next, in plain words.
Free, no sign-up
Every tool is free to use with no account. Bookmark the ones you use and get straight to the answer.
Meet Echo
Echoreads the numbers a tool just produced and tells you what they mean — “you'll pay $4,200 in interest; here's what an extra $100 a month does.” It can point you to the right tool, too.
Featured On
Recognized by premier developer directories, platforms, and privacy-conscious communities.
