Tools & Playground
A collection of interactive mini apps — all client-side, no backend required.
Typing Speed Test
Test your typing speed and accuracy with real-time WPM tracking and bilingual word sets.
Chemical Equation Balancer
Balance any chemical equation with exact integer coefficients instantly.
Subscription Manager
Track monthly subscriptions with renewal calendar and spending analytics.
Task Manager
Kanban-style task dashboard with drag & drop, filters, and priority management.
Periodic Table
Interactive periodic table of elements with bilingual EN/VI support.
Color Generator
Generate random color palettes and copy hex codes instantly.
2048
Slide tiles, merge numbers, and reach 2048. Classic puzzle game.
Simple Calculator
A basic calculator with +, −, ×, ÷ operations.
What If?
A good thing happens... but with a catch. Would you press the button?
FormForge
Build dynamic forms from JSON schemas with real-time preview.
Running Pace & Race Predictor
Calculate your target pace for any race distance and plan your weekly long runs.
Dev Utilities
Password generator & encoder/decoder for developers.
Aim Trainer
Test your reaction speed and click accuracy in a 30-second aim challenge.
Barbell Loader & 1RM
Plate loader visualizer and one-rep max calculator for strength training.
Vietnam Salary & Tax Visualizer
Calculate your net salary after BHXH insurance and personal income tax (PIT) with a visual flow breakdown.
PSU Estimator
Estimate power supply wattage for your PC build with real component TDPs.