Free Tools. Zero BS.
Free browser-based tools in 9 languages. No login, no install.
Explore ToolsReaction Speed Test
Test your reaction time and see how you compare with people worldwide.
CPS Test
Measure your clicks per second and compare with players worldwide.
Visual Memory Test
Test your visual memory by remembering grid patterns of increasing difficulty.
Aim Trainer
Train your aim speed and accuracy by clicking targets as fast as you can.
Keyboard Test
Test your keyboard for ghosting, N-key rollover, and key response time.
Keyboard Heatmap
Track your most-used keys in real time, build a heatmap from actual typing, and export the result as a PNG.
Typing Speed Test
Test your typing speed and accuracy with a gaming-themed typing challenge.
Monitor Refresh Rate
Detect your monitor's refresh rate and compare with other setups.
Mouse DPI Analyzer
Measure your mouse DPI and see how it compares with other gamers.
Color Blindness Test
Test your color vision with Ishihara-style plates optimized for gamers.
Spacebar Counter
How fast can you press the spacebar? Test your spacebar speed.
Scroll Speed Test
Measure your mouse scroll wheel speed and compare with others.
Number Memory Test
How many digits can you memorize? Test your number memory span.
Mouse Double-Click Tester
Detect if your mouse has a double-click problem. Click 20 times and we'll flag any unintended double-clicks from a worn-out microswitch.
Mouse Acceleration Detector
Find out if your OS mouse acceleration is active. Move slowly then quickly — we analyze your cursor's nonlinearity.
Mouse Sensitivity Converter
Convert your mouse sensitivity across 50+ games instantly. Enter your DPI and sensitivity to see your cm/360° and equivalent settings in every game.
.env Converter
Convert .env files to JSON, YAML, TOML, shell export, and Docker ENV instantly in your browser. Nothing is uploaded — all conversion is client-side.
JSON Formatter & Validator
Format, validate, and minify JSON instantly in your browser. Zero network requests — your data never leaves your device.
JWT Decoder
Decode JWT headers and payloads locally in your browser. Inspect claims, expiry, issuer, and timestamps without sending tokens anywhere.
Base64 Encoder / Decoder
Encode and decode Base64 locally in your browser. Supports text conversion, URL-safe Base64, and file-to-Base64 export.
Cron Expression Builder
Build cron expressions visually for Unix, Quartz, AWS EventBridge, and GitHub Actions. Preview upcoming run times instantly in your browser.
YAML ↔ JSON ↔ TOML Converter
Convert YAML, JSON, and TOML locally in your browser with multi-document YAML support and anchor resolution.
HTTP Security Headers Checker
Paste raw response headers or curl -I output to review common security headers locally, including CSP, HSTS, and COOP.
Log Formatter
Paste JSON, nginx, Docker, syslog, or plain logs to normalize, filter by level, and inspect them locally in your browser.
Aspect Ratio Calculator
Calculate aspect ratios instantly. Convert dimensions, solve for missing sides, and browse 2025/2026 social media image sizes.
Salary Calculator
Convert salary to hourly rate instantly. Calculate annual, monthly, weekly, daily, and hourly pay with configurable working hours and leave days.
Tip Calculator
Calculate tips and split bills instantly. Supports HK 10% service charge toggle, custom tip %, and per-person split with WhatsApp sharing.
Reading Time Estimator
Estimate reading and speaking time instantly. Paste any text to get word count, character count, reading time, and speaking time — CJK-aware.
Color Palette + WCAG Checker
Check contrast ratios, AA/AAA compliance, generate palette variants, and export CSS or Tailwind v4 color tokens locally.
GPA / Final Grade Calculator
Calculate the final exam score you need, run GPA what-if scenarios across multiple grading systems, and export a verdict card locally.
Floor Plan Tool
Lay out a room in 2D, drag furniture into place, rotate selected items, and export a clean PNG with no account or watermark.
Invoice Generator
Create a client-ready invoice with your branding, taxes, and line items, keep drafts locally, and download a clean PDF with no watermark.
Net Worth Tracker
Track assets, liabilities, and net worth locally with HK-friendly fields, automatic history snapshots, and CSV export.
TDEE Calculator
Estimate your daily calories with Mifflin-St Jeor, compare Harris-Benedict, and get macro targets you can bookmark.
ADHD Task Prioritiser
Paste your task list, answer three low-friction questions, and get one next task to do right now.
Cover Letter Builder
Build a tailored cover letter with three templates, instant preview, and PDF download in your browser.