EVERYDAY, MADE EASIER
When life asks,
USEOYO.
Calculate, convert, create or choose. Get a clear answer quickly, with no account and no unnecessary upload.
Explore tools ↓Most work stays on-device58 tools, always freeKO / EN
DECISION STUDIO
When choosing is work,
leave it to chance.
Lunch, music, movies and anything else. Pause the debate and get one answer.
01What Should I Eat?Edit the menu list, press spin and let chance decide.↗02What Should I Listen To?Spend less time choosing and hear one curated track.↗03What Should I Watch?Stop scrolling and let one curated movie win.↗04Coin FlipWhen two choices feel equal, leave the answer to a coin.↗05Random WheelBuild a wheel and let it make the decision.↗
THE USEFUL INDEX · 58
Everything useful, indexed.
One calm directory for the small tasks that keep showing up.
01Date CalculatorFind the exact distance between any two calendar dates.Date & Time↗02D-Day CalculatorSee how many days remain until your next milestone.Date & Time↗03Age CalculatorGet an exact age for today or any reference date.Date & Time↗04Time Zone ConverterPlan global meetings and travel without time-zone guesswork.Date & Time↗05Full-Screen Digital ClockDisplay the current time in full screen where everyone can see it.Date & Time↗06Full-Screen TimerKeep classes, study sessions, workouts and talks on time.Date & Time↗07Percentage CalculatorSolve common percentage questions in one place.Money & Shopping↗08Discount CalculatorKnow the real price before you buy.Money & Shopping↗09Split Bill CalculatorSettle group expenses without awkward math.Money & Shopping↗10Unit Price CalculatorFind out whether the bigger package is actually cheaper.Money & Shopping↗11Character CounterMeasure essays, posts and application text in real time.Text & Convert↗12Unit ConverterSwitch everyday units quickly and accurately.Text & Convert↗13What Should I Eat?Edit the menu list, press spin and let chance decide.Pick for me↗14Random WheelBuild a wheel and let it make the decision.Pick for me↗15Student Number PickerDraw student numbers with or without repeats.Pick for me↗16Image Resizer & ConverterChange image dimensions, quality and format without uploading it.Files & Images↗17PDF Merge & ExtractOrganize PDF files locally with no installation.Files & Images↗18QR Code GeneratorCreate a scannable QR code and save it as PNG.Create↗19Password GeneratorUse secure browser randomness to generate a password.Create↗20UUID GeneratorCreate unique identifiers for testing and development.Create↗21JSON Formatter & ValidatorClean up complex JSON and catch syntax errors quickly.Developer↗22JSON ↔ CSV ConverterMove copied data between JSON and CSV instantly.Developer↗23URL & Base64 EncoderHandle common developer encodings in one place.Developer↗24Hash GeneratorCreate integrity hashes locally with Web Crypto.Developer↗25Regex TesterSafely try a regular expression on your own sample.Developer↗26Case ConverterTurn names and sentences into the notation you need.Text & Convert↗27Color ConverterCompare common web color codes in one place.Text & Convert↗28Net Pay EstimatorModel take-home pay with tax, insurance and other deductions.Money & Shopping↗29What Should I Listen To?Spend less time choosing and hear one curated track.Pick for me↗30What Should I Watch?Stop scrolling and let one curated movie win.Pick for me↗31Coin FlipWhen two choices feel equal, leave the answer to a coin.Pick for me↗32Business Day CalculatorMeasure deadlines, delivery windows and leave in actual working days.Date & Time↗33Loan Payment CalculatorCompare the real cost of fixed-rate, fully amortizing loans.Money & Shopping↗34Compound Interest CalculatorSee how regular saving and compounding may grow over time.Money & Shopping↗35Electricity Cost CalculatorCheck the running cost of air conditioners, computers, heaters and other appliances.Money & Shopping↗36Trip Fuel Cost CalculatorSplit the fuel cost of road trips and commutes before you leave.Money & Shopping↗37Favicon & App Icon GeneratorPrepare browser, Apple touch and PWA icons from a single logo.Create↗38Photo Metadata RemoverRemove attached information in your browser before sharing an image.Files & Images↗39WCAG Color Contrast CheckerTest whether a color pair stays readable for normal and large text.Create↗40Random Team GeneratorAssign classes, workshops and games quickly and fairly.Pick for me↗41Random Seating ChartCreate and share a fresh seating plan for students or attendees.Pick for me↗42Pomodoro Timer & StopwatchBuild focused work blocks and time tasks from one screen.Date & Time↗43Invoice & Estimate GeneratorPrepare a simple business document in your browser without an account.Create↗44Cron Expression Builder & ExplainerBuild a recurring schedule from presets or inspect a custom expression before deployment.Developer↗45Unix Timestamp ConverterAuto-detect seconds or milliseconds and view local, UTC and ISO values together.Developer↗46JWT DecoderQuickly inspect JWT claims while keeping the distinction between decoding and signature verification clear.Developer↗47Text Diff CheckerFind changed lines in configs, drafts and code snippets directly in your browser.Developer↗48chmod CalculatorUse checkboxes or a three-digit octal value to build a Unix permission and chmod command.Developer↗49Room Area & Paint CalculatorAccount for doors and windows, coats, paint coverage and extra flooring allowance.Home & Living↗50Feet and Inches CalculatorWork with feet, inches and common fractional inches without converting them by hand.Home & Living↗51Tile and Flooring CalculatorPlan a flooring order with cuts, breakage and whole-box purchasing included.Home & Living↗52Concrete CalculatorTurn feet and inch-depth measurements into an order quantity using the yield printed on your bag.Home & Living↗53Mulch CalculatorPlan bagged or bulk mulch using common U.S. feet, inches and cubic-yard units.Home & Living↗54Time Card CalculatorTotal a time card with overnight shifts, empty days and payroll-ready decimal hours.Date & Time↗55Overtime Pay CalculatorUse editable 40-hour and 1.5× defaults to model a U.S. weekly paycheck before deductions.Money & Shopping↗56Decimal Hours ConverterTranslate 7 hours 30 minutes and 7.5 hours without confusing base-60 time and decimal notation.Date & Time↗57Profit Margin and Markup CalculatorInclude both fixed and percentage fees instead of judging a sale from headline revenue.Money & Shopping↗58Break-Even CalculatorSee how many sales are required before a product, event or small project recovers its fixed cost.Money & Shopping↗
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