3 new tools in the last 30 days
Calculators, converters, and a few things to poke at when you are bored. No sign-up, no install.
A mind map for laying out everything you need to study on one canvas. Branch out fast with the keyboard, stay smooth as it grows, and save your maps to a file or Google Drive.
Try it →July 29Slide and merge 3D tiles, build combo chains, and challenge your personal best in an immersive 2048 game.
Try it →July 27A mock trading game where you predict the next candle direction and practice day and swing trading.
Try it →July 25Tap a fortune cookie or four-leaf clover to reveal a playful daily fortune.
Try it →July 25An interactive simulator where you drag, tear, texture with images, and set fire to Verlet-physics cloth.
Try it →April 3All-in-one JSON validation, formatting, comparison, and conversion
Try it →A mind map for laying out everything you need to study on one canvas. Branch out fast with the keyboard, stay smooth as it grows, and save your maps to a file or Google Drive.
Slide and merge 3D tiles, build combo chains, and challenge your personal best in an immersive 2048 game.
A mock trading game where you predict the next candle direction and practice day and swing trading.
Tap a fortune cookie or four-leaf clover to reveal a playful daily fortune.
An interactive simulator where you drag, tear, texture with images, and set fire to Verlet-physics cloth.
All-in-one JSON validation, formatting, comparison, and conversion
A private study tool for organizing sets in folders, reviewing flashcards, and backing everything up as JSON.
Find the one tile with a slightly different color in the grid to test your color perception.
Search emoji by Korean or English keywords and copy them instantly.
Choose a difficulty and region, identify world flags, and challenge your best score.
Compare two GitHub profiles with public metrics, charts, and a clear winner card.
Browse NASA Astronomy Picture of the Day entries by date and save favorites in your browser.
Preview animated text in real time and export ready-to-use CSS or Motion code.
Review historical FX charts and simulate conversions for a specific past date.
Generate downloadable QR codes for text, URLs, WiFi, and more in one place.
Generate an Ethereum address, private key, and 12-word mnemonic locally in the browser, then back them up with QR and JSON.
Accurately calculate the elapsed days from birth date to a reference date.
Check body text counts and the title/description length shown in search results in one place.
Quickly convert mistyped text between Korean and English keyboard layouts.
A free tool to visually create CSS gradients and copy the code.
Convert between all Ethereum denomination units including ETH, Gwei, and Wei.
Analyze script timing and 4-section pacing to polish your interview self-introduction.
Calculate workdays between two dates, excluding weekends and Korean holidays.
Calculate the difference between two dates in days, weeks, and months.
Count down the remaining days to your target date in real time.
Generate random numbers instantly within a specified min–max range.
Randomly draw 6 numbers from 1–45 for the Korean Lotto 6/45.
Convert between HEX, RGB, and HSL color codes in real time.
Randomly pick one item from your list — an online raffle tool.
Switch between discount, change rate, ratio, and margin calculations with tabs.
Aim at a spinning target with 2–10 options, decide by the sector you hit, and share the result.
Quickly check the latest water temperature and pH at major Han River monitoring points.
Enter your Earth age and see your age on all 8 planets updated in real time.
Calculate remaining service days and upcoming milestones based on enlistment date.
Quickly convert between time and frame values based on video length and frame rate.