Essential phone tools,
in one webpage
Calculator, currency converter, pomodoro, QR code, image compressor, white noise, ledger… the utility apps you use most, all here: no install, instant open, offline-ready, data stays local.
Calculators
12 toolsCalculator
Arithmetic with history and keyboard input
∑Scientific Calculator
Trig, log, powers; degrees and radians
换Unit Converter
12 categories: length, weight, temperature, storage and more
¥Currency Converter
20 currencies, auto-updated online, cached offline
01Base Converter
Binary/octal/decimal/hex and any base from 2 to 36
体BMI Calculator
Body mass index with Chinese standard grading
税Income Tax
Take-home pay with social insurance and deductions
房Mortgage Calculator
Equal payment or principal; monthly cost and total interest
存Savings Planner
Simple/compound interest and recurring investment growth
日Date Calculator
Date intervals, workday counts, date arithmetic
时Timestamp Converter
Unix timestamp to date and back, live
折Discount Calculator
Final price after discounts, thresholds and coupons
Time & Focus
7 toolsPomodoro
25-minute focus sessions with auto breaks and stats
表Stopwatch
Millisecond precision with lap times
倒Countdown
Countdown for any duration with alarm
钟World Clock
Live time and offsets for major world cities
历Calendar
Lunar calendar, solar terms and traditional festivals
事To-Do List
Today's tasks with check-off, saved locally
记Notes
Quick notes with autosave and multi-note management
Random
6 toolsText
8 toolsText Diff
Line-by-line comparison with highlighted changes
字Word Counter
Characters, words, paragraphs and reading time
AaCase Converter
camelCase, snake_case, CONST and more in one click
{}JSON Formatter
Validate, format, minify and inspect JSON
M↓Markdown
Markdown editor with live preview
64Base64
Text and file Base64 encode/decode, Unicode-safe
%%URL Codec
URL encode/decode and query parameter parsing
·-Morse Code
Text to Morse and back, with audio playback
Image & Color
8 toolsImage Compressor
Compress JPEG/PNG right in the browser
转Image Converter
Convert between PNG, JPG and WebP
裁Image Cropper
Free cropping with aspect-ratio lock
拼Image Stitcher
Stitch images horizontally, vertically or in grids
色Color Palette
Color picker, harmonies and image color extraction
QRQR Code
QR codes from text or links, colored and downloadable
渐Gradient Maker
Visual CSS gradient editor, one-click copy
像Avatar Generator
Deterministic cartoon avatars, SVG/PNG download
Life & Health
7 toolsWater Tracker
Daily water intake logging with goal progress
重Weight Tracker
Weight trend chart with change tracking
月Period Tracker
Cycle, ovulation and fertility predictions
音White Noise
Rain, wind, waves — synthesized for sleep
拍Metronome
BPM 30-300 with accent and tap tempo
息Breathing Exercise
4-7-8 breathing for quick relaxation
账Ledger
Income/expense records with monthly stats