All Tools

Paste. Compare. Copy the diff.

Semantic diff for JSON & YAML with color-coded comparison and copyable plain-text summaries.

The Unix timestamp converter that tells you what you're looking at.

Auto-detects seconds, milliseconds, microseconds, or nanoseconds. Multi-format output with one-click copy.

The jq playground developers actually keep open.

WASM-powered jq execution with shareable permalinks, curated examples, and persistent query history.

The fastest, cleanest JSON formatter online.

Instant beautify and minify with syntax highlighting, error positions, and one-click copy.

See exactly which cron field is wrong, and why.

Field-level cron validation with human-readable schedule descriptions and next execution dates.

Hex math that shows its work in every base.

Hex calculator with arithmetic and bitwise operations, plus live output in hex, decimal, octal, and binary.

Paste a messy table. Get a perfect one, aligned as you type.

Markdown table formatter with live preview and correct CJK wide-character alignment.

Build an RBAC matrix. Export it anywhere.

Checkbox-grid permission matrix generator with export to Excel, CSV, Markdown, and JSON. No spreadsheet required.

CSV to JSON in one paste.

Auto-delimiter detection, four JSON output modes, pretty-print or compact, download or copy.

Format SQL in seconds, right in the browser.

14 SQL dialects, keyword case controls, indentation options, and a unique before/after diff view.

Token count and cost: exact for GPT, estimated for Claude and Gemini.

Multi-model token counter with cost estimation, context window usage, and live stats. Everything runs in your browser.

Every composition guide, on any photo, in your browser.

Overlay a golden spiral, phi grid, golden triangle, or rule-of-thirds guide on any image you upload: instant, non-destructive composition analysis in the browser tab you already have open.

Your favicon set, dark-mode ready, in 90 seconds.

Favicon package generator producing dark-mode-ready SVG favicons and cross-platform icon sets, fully processed in the browser.

CSS text gradients with real fonts and real color science.

A client-side CSS text gradient generator with Google Fonts, OKLCH color, and a live typography preview. Copy production-ready CSS in under a minute.

CSS gradients with Tailwind output and OKLCH color quality.

Visual gradient builder with perceptual color space interpolation, Tailwind-native code output, and one-click copy.

Drop an image, paste a :root.

Image-to-palette extractor with CSS custom properties, Tailwind v3/v4 output, JSON design tokens, and a WCAG contrast pairings matrix.

Convert colors as you type. Copy in one click.

HEX, RGB, HSL, and CMYK conversion in real time with a session color history that persists across page refreshes.

Contrast ratio, instantly clear.

WCAG 2.2 + APCA contrast checker that shows the closest on-brand fix for failing color pairs and generates shareable permalinks.

Hit space. Get colors that actually pass.

Spacebar-fast, accessibility-first color palette builder. WCAG 2.1 AA/AAA and APCA scored on every pair, with plain-language coaching and CSS / Tailwind v4 export.

Font pairings that explain themselves.

Curated heading/subheading/body trios from Google Fonts with plain-language explanations of why each pairing works.

The honest ceramic coating cost and payback calculator.

Free, no-signup ceramic coating calculator: coverage, real DIY-vs-pro cost, and the month it pays for itself, in under a minute.

Accurate drywall sheets in seconds.

Drywall sheet estimator with door/window deductions, accessories breakdown, and cost estimate in under 60 seconds.

Know exactly how many boxes to buy.

Flooring calculator for hardwood, laminate, LVP, tile, and carpet with smart waste defaults per material type and cost estimates.

Know exactly how much mulch you need, beds and bags both.

Cubic yard and bag count estimates for garden beds. Enter dimensions, pick depth, get bag counts and a cost total.

The wallpaper roll calculator that prints your shopping list.

Per-wall wallpaper roll calculator with door and window deductions, pattern match handling, a waste slider, and a printable shopping list.

Compost ratios in plain language, not just a C:N number.

A mobile-first compost calculator that turns carbon-to-nitrogen math into plain-language recipes: "add 2.5 buckets of dried leaves to reach 28:1."

Mark your studs right the first time.

Stud spacing calculator with a scaled placement diagram listing exact stud positions in feet and inches. The output no competitor offers.

Know exactly what to buy before you hit the paint aisle.

Accent wall paint calculator with door/window subtraction, cost estimates at three price tiers, and a printable shopping list.

The compound interest calculator that doesn't get in your way.

Drag sliders, watch your money grow. Real-time compound interest with a stacked growth chart and a full year-by-year breakdown.

See what your photos are hiding, then strip it.

In-browser metadata removal for JPEG, PNG, WebP, HEIC, and AVIF. Preview GPS, device IDs, and timestamps before wiping them in one click.

COGS, gross profit, and margin in one calculation.

Enter inventory and costs, hit Calculate, and get COGS, gross profit, gross margin, and a step-by-step formula breakdown.

Compress unlimited images without a single upload.

Browser-only batch image compressor with a live before/after slider, unlimited queue, and zero network requests.

Density, mass, volume: solved and explained.

Three-variable calculator with unit conversion across 24 units, step-by-step breakdowns, and a material reference table.

The clean APR↔APY converter. Your answer in 10 seconds.

Bidirectional APR↔APY converter with eight compounding frequencies, live results, and the formula always in plain sight. No funnels, no clutter.

Every down payment scenario, side by side.

Compare 3%, 5%, 10%, 20%, or your own down payment with real PMI costs, the year PMI drops off, and total cash needed at closing.

Test statistic in, p-value out. 30 seconds.

P-value calculator for Z, T, chi-square, and F distributions with tail selection and plain-English significance interpretation.

Am I intoxicated? How long until I'm sober?

BAC calculator with custom ABV per drink, color-coded results against the legal limit, and an estimate of how long until your BAC reads zero.

The shrink number Ugly's leaves out, front and center, in one glance.

Free conduit offset and 3-point saddle calculator for electricians. Pick a trade angle, enter the rise, and read your mark spacing plus the shrink to add back, with shrink as the hero output, in under 15 seconds.

Cut crown molding right the first time.

Free crown molding compound miter calculator that gives exact saw miter and bevel angles for any spring angle and real wall corner, plus a diagram showing how to orient the piece on the saw.

Read the stick, get the gallons.

A free, mobile-first calculator that turns a horizontal-tank dipstick reading into gallons remaining and gallons to fill.

Tension per sling leg, from a tape measure, not a protractor.

Sling tension calculator for field riggers. Enter height and leg length with no protractor needed, or type a known angle straight in, and read tension per leg, the tension factor, and a color-coded danger warning in under 30 seconds.

Know how far your blade runs past the line before the first cut.

A free calculator that tells stone and concrete cutters exactly how far a large-diameter circular blade overruns the cut line, with bevel and reverse safe-depth modes and a live side-profile diagram in Forward and Reverse.

The ramp length you need, and whether you'll drag your belly getting up it.

A free, vendor-neutral ramp calculator that solves the length you need for a safe loading angle, and gives a plain-language breakover verdict on whether a low vehicle will high-center at the transition.

Wilks and DOTS side by side, with the math shown.

A free relative-strength calculator that scores your Wilks and DOTS coefficients side by side as co-equals, then lets you expand the math to see both formulas worked with your own bodyweight and total.

Your coefficients, your roster, one pace grid.

A free pace chart builder for coaches: athletes down the side, your own coefficient columns across the top, every cell computed live in mm:ss.00. Copy the whole grid into Google Sheets as text that stays text.

Your macros in 30 seconds, with the math shown.

Free macro calculator that returns your daily calorie target and protein, carb, and fat grams instantly, with dietary-style presets and a live macro-split chart.

Enter two of pace, time, distance. Get the third and splits.

A three-way running pace calculator that solves pace, finish time, or distance from any two of them, in min/mile and min/km at once, with a cumulative splits table you can copy to the clipboard.

Two numbers. Instant one-rep max. No funnel.

Client-side one-rep-max calculator with Epley/Brzycki/Lombardi formulas, an lb/kg toggle, an auto %1RM table, and a rep-count accuracy caveat.

Exact plates per side, both directions, in one glance.

A free barbell plate calculator that works both ways: enter a target to see the exact plates per side on a to-scale bar, or tap plates onto the bar to build a running total. lb and kg on one page, custom bar weight and inventory, and an honest nearest-achievable weight when a target can't be loaded exactly.

Body-fat percentage from a tape measure. No calipers.

US Navy body-fat calculator with tape-placement guidance on every field, a transparent formula, a fat- and lean-mass breakdown, and an honest accuracy caveat at the result.

Your daily calories, remembered for your next visit.

A zero-friction TDEE and BMR calculator that shows every activity level at once, explains why your number differs from other calculators, and remembers your inputs on-device so a return visit opens pre-filled with your number already on screen.