iConverter — 99 Tools, One App Everything you calculate, converted. 99 essential tools for everyday math, unit conversion, and developer utilities — all offline, ad-free, and free forever. Why iConverter? More than a calculator. Check your BMI, debug APIs, compare mortgage plans, convert recipes, track global time zones, clarify family relations, or extract video frames — all in one app. Nine categories. 99 tools. Instant launch, zero clutter. Nine Categories, 99 Tools Calculators (3) Standard, Scientific, and Programmer modes. Full DEC/HEX/OCT/BIN support with bitwise ops; switchable 8/16/32/64-bit word sizes. Finance (7) Mortgage (Standard/Combined/LPR), Prepayment Comparison (term vs. payment), Second-hand Home Taxes (deed/income/VAT/agent), Income Tax (deductions + bonus comparison), Compound Interest (inflation-adjusted), Discount Calculator (6 modes), Tip & Bill Split (weighted + tax). Date & Time (9) Age & Anniversary, Date Arithmetic, Lunar Calendar (1900–2100), Solar Terms, Countdown (syncs to calendar), Due Date, Menstrual & Ovulation Cycle, World Clock (map picker), Zodiac Signs. Math (7) Percentage (multi-mode), Fraction Calculator (auto-simplify), Prime Factorization (GCD/LCM), Quadratic Equation Solver, Statistics, Permutations & Combinations, Geometry. Encoding & Dev (25) HTTP Request (headers/body/certs/latency), HTTP Status Codes, JSON Formatter, JWT Decoder, Cron Parser, IP Utility (subnet/v6), Regex Tester, Password Generator, Random Number, Base64, URL Encoder/Decoder, Hash (MD5/SHA), Bank Card Validator (Luhn + issuer), QR Code (gen/scan), Roman Numerals, Unix Timestamp, Word Count, Color Converter, Text Case (10+ styles), Text Diff, Morse Code, ASCII Table (0–255), File Downloader (speed/progress), Web Browser (bookmarks/history/JS console/UA switch/source view). Lifestyle (15) BMI, BMR & TDEE, Clothing Size (CN/US/EU/JP), Ring Size, Height Converter, Fuel Cost, Shipping Fee, Blood Alcohol (global limits), Relationship Terms (kinship lookup), ID Card Parser (region/gender/age), Coin Flip, Dice Roller, Random Draw, Spin Wheel, Video Frame Export (batch JPEG/PNG export). Sensors (3) Compass (true/magnetic north), Level (no permissions), Altitude (GPS + barometric). Chinese Tools (3) Chinese Number Converter, Reverse Converter, Formal Invoice Amount. Unit Conversion (27 categories) Length, Area, Volume, Weight, Temperature, Time, Speed, Pressure, Energy, Power, Force, Torque, Frequency, Angle, Data Storage, Data Transfer Rate, Illuminance, Magnetic Flux Density, Radioactivity, Viscosity, Fuel Economy, Flow Rate, Density, Magnetic Flux, Absorbed Dose, Equivalent Dose, Amount of Substance. Home & Lock Screen Widgets (21 designs) Interactive widgets for Calculator, Relationships, BMI, Fuel Cost, Discount, Tip Split, Compound Interest, Mortgage, Unit Conversions, World Clock, Countdown, Date Math, Lunar Calendar, and more. Access tools instantly without opening the app. Thoughtful Details 1. Languages: Simplified/Traditional Chinese, English (follows system or overrides). 2. Shortcuts: Long-press home icon for 4 customizable favorites. 3. Icons: 12 alternate app icons (Neon, Gold, Vintage, etc.). 4. Theming: 12 accent colors + custom picker; syncs with widgets. 5. History: Shared calculator history across modes; one-tap session restore. 6. Search: Full-text menu search (supports aliases). 7. Copy: One-tap copy for all results with toast confirmation. 8. Compatibility: All iPhone models, iOS 15.0+. Privacy First Zero ads. Zero tracking. Zero in-app purchases. Nearly all tools run 100% offline. Your data never leaves your device, never uploaded, never analyzed. • Only exception: The HTTP Request tool connects to the internet only upon your explicit command. • Permissions: Compass (Location) and Altitude (Motion) are requested on-demand and fully revocable in Settings. iConverter — the only tool app you'll use every day.