250+ free utilities · 10+ categories · client-side & private
The right tool, and the answer.
Precision developer tools, financial math, text utilities, and converters. Fast, quiet, and runs entirely in your browser. Ask Echo to translate numerical results into insights.
Every desk, at a glance
10+ categories, from money math to developer utilities. Jump to any of them.
Popular tools
The ones people reach for most — start here if you're not sure.
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.
Where most people start
A closer look at four of the busiest categories.
Finance
Paychecks, loans, tax and retirement — the money math, worked out in full.
Trending this season
Newer and seasonal picks getting a lot of use lately.
Current conditions and a 6-day forecast for any city — no API key, no sign-up.
Extract text from images in your browser with multi-language OCR — no upload.
Project your retirement nest egg with compounding contributions and inflation.
Check any page's Google performance score and Core Web Vitals, lab and field.
Recently added
The latest tools to join the panel.
Generate click-optimized Meta Titles and Meta Descriptions for higher CTR.
Cluster lists of keywords into informational, transactional, and commercial groups.
Analyze images to write descriptive, keyword-optimized accessibility alt-text.
Build regular expression patterns from descriptions and explain how they execute.
Describe tables and target metrics to compile optimized relational SQL queries.
Understand complex code snippets from any language with plain-English breakdowns.
Translate texts across multiple languages while perfectly adapting tone and style.
Get custom mock interview questions and expert answer guidelines for any role.
Built to be fast, private, and quiet
No accounts, no tracking theatre, no dark patterns — just the answer.
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.