All tools — Page 9
983 useful tools. Browse a category or search the full toolkit.
IndexNow Payload Workbench
Validate a bounded offline IndexNow JSON payload against declared host,key and directory-scope rules.
AccessibilityExplicit Table Header Association Auditor
Inspect explicit headers references and scope declarations within each static HTML table.
AccessibilityStatic Landmark Region Auditor
Inventory declared/native landmark candidates and limited naming evidence in pasted HTML source.
AccessibilityStatic Focus Order Inspector
Inspect a limited source-order model of explicit tabindex and common native focus candidates.
AccessibilityDocument Language and Direction Auditor
Inspect inherited HTML lang/dir declarations over literal text regions with explicit uncertainty.
AccessibilitySVG Source Accessibility Auditor
Inspect SVG title/description,label references and decorative intent without rendering the vector.
CalculatorsDuPont ROE Calculator
Decompose a user-supplied return on equity into profit margin, asset turnover and equity multiplier.
CalculatorsPortfolio Allocation Delta Calculator
Reconcile current holding values with user-chosen target weights and a cash contribution or withdrawal.
CalculatorsPayment Fee Calculator
Calculate net proceeds or the smallest minor-unit gross amount under one entered percentage-plus-fixed fee rule.
CalculatorsTiered Commission Calculator
Compare marginal and retroactive commission rules with an explicit per-tier breakdown.
CalculatorsInvoice Early-payment Terms Calculator
Compare an entered invoice discount with its simple annualized financing equivalent over the extra payment days.
CalculatorsOvertime Pay Scenario Calculator
Estimate gross pay from entered hours, a regular-hour threshold and a user-defined premium multiplier.
CalculatorsClosed Funnel Conversion Calculator
Calculate stage conversion, drop-off and overall completion from one matched closed-funnel population.
CalculatorsCohort Retention Calculator
Calculate an age-aligned retention matrix while keeping unobserved cohort periods separate from actual zeros.
CalculatorsRecurring Revenue Bridge Calculator
Reconcile user-entered recurring-revenue movements and explicitly defined opening-cohort retention fractions.
CalculatorsDated Cash-flow Balance Planner
Build a calendar-day closing-balance schedule from supplied signed cash movements and an opening balance.
CalculatorsCash Denomination Planner
Find a minimum-item allocation of exact minor units using allowed denominations and optional stock limits.
MathTrigonometric Functions Calculator
Evaluate a real trigonometric or inverse function with explicit degree/radian conventions and domain checks.
MathExact Rational Representation Workbench
Convert recurring decimals and fractions, or find a best bounded-denominator approximation on the same page.
MathFinite Difference Table Calculator
Build exact differences across a bounded observation list without inferring a unique sequence formula.
MathPolynomial Long Division Calculator
Divide exact plain-decimal coefficient polynomials and export quotient/remainder coefficients.
MathBracketed Polynomial Root Finder
Find one supported real root inside a supplied sign-change bracket and report its enclosure and residual.
MathAffine Coordinate Transform Composer
Apply ordered numeric2D translation, rotation, scaling or skew to a point table, with a guarded inverse mode.
MathBarycentric Coordinate Calculator
Find exact-grid triangle weights and classify supplied points as inside, on the boundary or outside.
MathPoint in Polygon Calculator
Classify query points against one validated simple planar polygon using exact-grid boundary and winding tests.
MathLine and Segment Intersection Calculator
Distinguish unique intersections, collinear overlaps, parallel lines and degenerate planar segments on a declared grid.
Math2D Convex Hull Calculator
Reduce a bounded point cloud to an ordered exact-grid convex boundary with a stated collinear policy.
MathCartesian Cylindrical and Spherical Coordinates
Convert a numeric3D point with explicit azimuth and spherical polar-inclination conventions.
Date & timeRetail Fiscal Calendar Calculator
Map a date to a user-anchored retail fiscal week and period, and download the complete week calendar.
Date & timeJulian Date and MJD Converter
Convert a bounded UT1 Gregorian calendar clock to noon-based Julian Date or Modified Julian Date and back.
Date & timeVideo Timecode and Frame Count Calculator
Convert legal non-drop or NTSC drop-frame labels to exact frame counts with rational-rate elapsed time.
Date & timeInterval Schedule Coverage Analyzer
Merge explicit-offset schedule intervals or find intersection, coverage thresholds and finite-horizon gaps.
CalculatorsBilling Proration Scenario Calculator
Calculate an entered price’s partial-period share with an explicit day/second basis and exact rounding convention.
MathDensity Mass and Volume Calculator
Solve one missing SI quantity in the density relationship with explicit zero and inverse states.
MathNewton Force Mass Acceleration Calculator
Solve one-dimensional net force, mass or acceleration in an explicit SI Newtonian model.
MathMechanical Energy Calculator
Calculate kinetic and reference-dependent gravitational energy from entered SI values.
MathEnergy Power and Time Calculator
Solve average power, energy or a positive elapsed time in consistent joule/watt/second units.
MathTorque and Lever Balance Calculator
Calculate planar torque magnitude or an opposing force for a simple perpendicular lever balance.
MathLinear Spring and Oscillator Calculator
Calculate ideal spring restoring force, stored energy and undamped oscillation period.
MathIdeal Thermal Mixing Calculator
Find a same-phase equilibrium temperature from supplied masses, heat capacities and Kelvin temperatures.
MathIdeal Gas Law Calculator
Solve pressure, volume, amount or absolute temperature in the entered ideal-gas SI state.
MathSeries RLC Impedance Calculator
Calculate series RLC reactance, impedance, phase and RMS current for an entered sinusoidal model.
MathLoaded Voltage Divider Calculator
Calculate an ideal divider output with an explicit optional resistance across its lower leg.
MathLED Series Resistor Scenario Calculator
Calculate a resistor for an entered LED drop/current scenario and verify current after optional E12 rounding.
MathFirst-order RC Filter Calculator
Find a single-pole RC cutoff and ideal unloaded gain/phase at an entered frequency.
MathResistor Color Code Workbench
Decode supported four/five-band resistance colors or encode an exactly representable nominal value.
MathIdeal Op-amp Gain Calculator
Calculate a fixed inverting/noninverting ideal gain and compare the unclipped output with user-entered bounds.
MathFree-space RF Link Budget Calculator
Reconcile user transmit/gain/loss assumptions under a declared far-field free-space model.