01
Loan Calculator ↗
Compare amortization payments (equal principal, equal payment, bullet loan) and monthly schedule tables.
Calculator
JUUALABS APP STUDIO
We turn useful, playful ideas into apps.
Everyday friction, curious ideas, and repetitive tasks become simple web apps that people can try, use, and enjoy right away.
idea queue
shipping
Today's Experiment
Sharing 3-minute logs with friends like a game
comfort
Friction-free flow
play
Joy that brings you back
OUR UTILITIES
Delightful web utilities that simplify calculations.
Search, filter, and explore our collection of lightweight calculators and conversion tools.
02
Korean Jeonse Deposit Calculator (Korean-specific) ↗
Calculate needed loan amounts and budget deficits based on deposit amount and equity.
Calculator
03
Area Pyeong-Sqm Converter (Korean-specific) ↗
Convert apartment sizes between Korean Pyeong and Square Meters (㎡) bi-directionally.
Converter
04
Percentage Calculator ↗
Easily calculate percentage increases, decreases, discount rates, and basic proportions.
Calculator
05
D-Day & Date Calculator ↗
Compute days between two dates, add or subtract days, and exclude weekends if needed.
Converter
06
VAT & Tax Calculator ↗
Calculate 10% value-added tax bi-directionally from net values or gross amounts.
Calculator
07
Solar-Lunar Calendar Converter (Korean-specific) ↗
Convert solar dates to lunar dates and vice versa. Explores lunar leap months and Korean traditional calendar info.
Converter
08
Jeonse Loan Limit Calculator (Korean-specific) ↗
Check your estimated maximum loan limit based on deposit size, annual income, interest rates, and current DSR regulations.
Calculator
09
Salary Take-Home Calculator (Korean-specific) ↗
Calculate your monthly net pay after all Korean deductions — national pension, health insurance, income tax — using 2025 official rates.
Calculator
OUR PLAYGROUND
Relax your mind and enjoy lightweight browser games.
Take a quick break and train your brain with our selection of interactive mini-games.
01
Sakura Memory Game ↗
Match cards decorated with beautiful cherry blossom emojis. Test and train your short-term memory.
Game / External Link
02
Daily Word Puzzle
A daily brain training word puzzle where you guess the hidden Korean or English words.
Game / Coming Soon
03
Mini Minesweeper
A classic minesweeper puzzle game built for quick breaks, optimized for both desktop and mobile.
Game / Coming Soon
HOW WE MOVE
We don't overthink ideas. We build small and learn fast.
We watch for recurring friction and strangely delightful moments.
We trim down to the single most essential action for the first version.
We let real user responses shape what comes next.
CONTACT