All tools — Page 7
983 useful tools. Browse a category or search the full toolkit.
Proportion Confidence Interval Calculator
Calculate a bounded Wilson score interval from a success count and sample size.
MathProportion Sample Size Calculator
Plan a simple-random proportion sample from confidence, margin, and an explicit anticipated proportion.
MathTwo-proportion A/B Test Calculator
Compare two independent success rates with an explicitly approximate two-sided pooled z test.
MathPearson and Spearman Correlation Calculator
Measure paired linear or rank association with explicit average ranks for ties.
MathChi-square Independence Calculator
Inspect a two-way count table with Pearson’s statistic, expected counts, and a conditional approximate p value.
MathPercentile Calculator
Compute specified percentiles of a finite sample using a named interpolation or rank convention.
MathMoving Average and EWMA Calculator
Smooth an ordered numeric series with full-window simple averages or a stated EWMA seed.
Date & timeTime Zone Converter
Render an explicitly offset timestamp in several IANA time zones without guessing ambiguous local time.
Date & timeMeeting Time Zone Planner
Find 15-minute-grid meeting starts inside each participant’s local daily availability on a chosen UTC search day.
Date & timeTimesheet Elapsed Hours Calculator
Sum nonoverlapping work intervals with explicit timestamp offsets and unpaid break minutes.
Date & timeRecurring Calendar Date Generator
Generate bounded daily, weekly, monthly, or yearly dates while skipping nonexistent calendar dates.
Date & timeISO Fixed Duration Calculator
Add or subtract signed ISO day/time durations with exact millisecond arithmetic.
Music & audioMusic Pitch and Interval Calculator
Convert scientific note names, MIDI notes and frequencies, or compare a pitch interval under your chosen A4 tuning.
Music & audioTempo and Note Duration Calculator
Calculate note, tuplet and bar durations from an explicit BPM beat unit, dot count and time signature.
Music & audioTest Tone WAV Generator
Generate a bounded sine-wave tone as a downloadable 48 kHz mono16-bit PCM WAV, with a digital level and optional fade.
Music & audioPCM WAV Inspector and Trimmer
Inspect, frame-trim, peak-normalize or swap channels in a bounded local16-bit mono or stereo PCM WAV file.
Music & audioChord Chart Transposer
Transpose a chord-only chart, preserving supported quality modifiers, slash bass, whitespace and barlines.
CalculatorsRecipe Serving Scaler
Scale every named ingredient to one or several serving counts, keeping original units and exact fraction results.
CalculatorsBaker’s Percentage Workbench
Calculate whole-formula baker percentages, explicit water hydration and scaled dough masses across final-mix and preferment components.
ImagesImage Print Size Calculator
Plan image print dimensions, required pixels or effective PPI on each axis, with explicit aspect-ratio checks.
CalculatorsScreen Pixel Density Calculator
Calculate native display PPI, pixel pitch and active width/height from resolution and a measured diagonal; optionally compare two panels.
DeveloperTypography Scale and Token Generator
Build a bounded type-size ladder and named role styles as CSS custom properties or JSON tokens, using your own base and ratio.
DeveloperCSS Border Radius Workbench
Generate eight-value elliptical corner CSS, calculate overlap scaling and preview the resulting rounded rectangle locally.
DeveloperHTML Formatter and Minifier
Format static HTML or remove ordinary comments while preserving all other source characters.
DeveloperCSS Formatter and Minifier
Format a CSS stylesheet or serialize its syntax tree with compact token spacing.
DeveloperJavaScript Formatter and Minifier
Format JavaScript or compact parsed script/module source without executing it.
DeveloperJavaScript AST Explorer
Inspect syntax-node types and source ranges in a JavaScript script or module.
DeveloperStatic Module Dependency Graph
Map supplied JavaScript modules, unresolved imports and dependency cycles locally.
DeveloperCSS Selector Specificity Analyzer
Calculate selector specificity tuples, including supported functional selector rules.
DeveloperCSS Custom Property Resolver
Resolve var() references, fallbacks and cycles in an explicit custom-property map.
DeveloperHTTP Message Framing Inspector
Inspect one supplied HTTP1 message and decode strictly bounded chunked content offline.
DeveloperContent Disposition Workbench
Build download headers or inspect international filename parameters safely.
DeveloperMultipart Form Body Workbench
Build ordered text/file-like parts or inspect a bounded Base64 multipart body.
DeveloperTLS ClientHello Inspector
Decode captured ClientHello record bytes without making a TLS connection.
DeveloperIP CIDR Set Aggregator
Merge IPv4/IPv6 CIDRs or calculate exact set intersection and difference.
DeveloperURI Template Expander
Expand supported RFC6570 URI templates from explicit scalar, list and map variables.
SEOSecurity.txt Workbench
Build or inspect supported security.txt contact and disclosure-policy fields.
DeveloperPermissions Policy Workbench
Build or inspect supported Permissions-Policy headers and iframe allow grammar.
DeveloperPostgreSQL Query Plan Explorer
Explore supplied EXPLAIN JSON with node hierarchy, estimates and explicitly labeled actual metrics.
DeveloperSource Map Explorer
Decode basic version3 source maps and inspect generated/original mapping anchors.
DeveloperDNS Wire Message Workbench
Build an offline DNS query or inspect a bounded captured DNS wire message.
DeveloperWebAssembly Binary Inspector
Inspect selected WebAssembly section ranges, imports, exports and declared memory limits without execution.
DeveloperDevelopment Key Pair Generator
Generate local test signing keys with an explicit private-key export choice.
FilesDetached File Signature Workbench
Sign exact local file bytes or verify a detached signature with a supplied JWK.
DeveloperKey Derivation Test Workbench
Compute reproducible HKDF or PBKDF2 vectors from explicit hexadecimal inputs.
DeveloperOAuth PKCE S256 Workbench
Generate a random PKCE verifier/challenge or check a supplied S256 pair locally.
DeveloperHTTP Digest Authentication Test
Reproduce a supported qop=auth MD5 or SHA256 response from explicit test fields.
ImagesImage Perspective Editor
Rectify a convex raster quadrilateral into a bounded rectangular PNG.