Utilities
Free Tools
Client-side utilities. No accounts, no signup. Your inputs and calculations never leave your browser. The site itself is ad-supported and uses analytics — see our privacy policy.
90+ client-side tools · 30 dev · 15 finance · LLM cost calc · freelance rate · solar savings · 4 insurance · 7 health · 18 construction · 4 image · QR · word counter · 6 everyday · currency · + more
Developer · Utilities
Developer Tools Suite
30 client-side tools in one page: JSON, JWT, Base64, regex tester, cron parser, diff checker, markdown preview, code beautifier, CSV↔JSON, chmod, CIDR, password generator, favicon maker, and more.
ΦDeveloper · AI/LLM
LLM Token Counter & API Cost Calculator
Count tokens and compare monthly API costs across 32 models from Anthropic, OpenAI, Google, xAI, and DeepSeek. Live pricing sourced from provider pages with per-entry source URLs. Sortable comparison table plus per-family reference.
¥Finance · Calculators
Financial Calculators
15 client-side calculators: paycheck / take-home (2026 federal + FICA), mortgage (PITI/PMI/extra), auto loan, retirement/401(k), debt payoff, rent vs. buy, inflation, income tax bracket, freelancer tax, compound interest, savings goal, ROI, FIRE, side hustle, and crypto DCA. Each has its own deep page.
▲Finance · Freelancer
Freelance Rate Calculator
Work out the hourly and day rate you need to charge to hit your take-home target. Accounts for self-employment tax (2026 constants), federal/state income tax, overhead, health insurance, retirement, and billable utilization. Shows a full "where every dollar goes" breakdown.
☀Home · Energy
Solar Savings Estimator
Rough-order-of-magnitude estimate of system size, upfront cost, payback period, and 25-year savings using NREL-derived state peak-sun-hours. Honest range machine, not a precision quote. Reflects the 2026 termination of the 30% federal residential credit (OBBBA).
☢Analysis · AI-Powered
Manipulation Detector
Paste any text and get an instant analysis of persuasion tactics, emotional manipulation, logical fallacies, and deceptive language patterns. See through the noise.
Demo mode — AI layer temporarily offline. Pattern-matching engine still active.
⚄Cryptography · Randomness
Entropy Visualizer
Generate true random numbers from device entropy — mouse movement, sensors, and cryptographic sources. Watch randomness form in real time. Bank-grade HMAC-DRBG.
🖼File Tools · Image
Image Tools
4 image utilities: compressor with quality slider, format converter (JPG/PNG/WebP/AVIF), resizer (dimensions, %, or target file size), and cropper (freeform + fixed ratios). EXIF orientation handled; files never leave your browser.
▩Utilities · QR Codes
QR Code Generator
Generate QR codes for URLs, text, WiFi credentials, vCards, or email links. Custom colors with contrast warning, error-correction levels, center logo overlay (auto-bumps EC to H), PNG + SVG download.
✍Text · Writing
Word Counter & Text Tools
Live word/character/sentence/paragraph counting with reading + speaking time, keyword density, Flesch reading ease, and Flesch-Kincaid grade level. Nothing you type is uploaded.
⚙Everyday · Calculators
Everyday Calculators
6 utilities for common tasks: percentage (three modes), age with next-birthday countdown, date duration with business-days, GPA (4.0 scale + weighted), time zone meeting planner, and wheel spinner / random picker with shareable URL.
🛡Insurance · Coverage
Insurance Calculators
4 client-side calculators: life insurance needs (DIME + income-multiple side by side), term vs. whole life comparison, disability insurance gap analysis, and auto insurance coverage recommender with state minimums for all 50 states + DC.
⚕Health & Fitness · Body Metrics
Health & Fitness Calculators
7 client-side calculators: BMI, TDEE (Mifflin-St Jeor with safety-floor clamp on calorie targets), macro split, BMR with 3 formulas side by side, body fat percentage (US Navy tape method), ideal weight (4 formulas), and daily water intake.
€Finance · Foreign Exchange
Currency Converter
Convert between 30+ world currencies using European Central Bank reference rates via the Frankfurter API. localStorage cache with graceful offline fallback. The only tool on the site that fetches external data (disclosed in-UI).
⚒Construction · Calculators
Construction Calculators
18 client-side estimators covering concrete, paint, flooring, lumber, fencing, wallpaper, drywall, tile, gravel, mulch, roofing/shingles, deck materials, stair rise/run, asphalt, insulation R-value, BTU/HVAC sizing, sod, and retaining wall blocks. Imperial + metric on every tool.
☉Wellness · Breathwork
Breathwork Timer
Guided breathing exercises with hypnotic visualizations. Box Breathing, 4-7-8, Wim Hof, and Nadi Shodhana. No app install needed. Just breathe.
✲Developer · Regex
AI Regex Architect
Describe what you want to match in plain English and get the exact regex. 35+ built-in patterns, live test area, match highlighting, and a cheat sheet. Terminal aesthetic.
Demo mode — AI layer temporarily offline. Keyword matching against 35+ built-in patterns still active.
✦Developer · Reference
The Nexus — API Directory
Curated directory of 50+ public APIs across AI, data intelligence, government transparency, payments, and more. Categorized, searchable, with docs links and auth info.
♫Music · Rhythm
Polyrhythm Metronome
Visual metronome for complex time signatures. Two independent rhythm layers with circular visualization, accent patterns, tap tempo, and presets for Hemiola, Afro-Cuban, Balkan, and more.