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Everything you need.
One Kit.
Hundreds of ready-made tasks — PDF, images, audio, OCR, text AI, scraping, data and more — behind a single REST API. Send a job, get a finished result by webhook. No servers, no per-model tokens, a price you can read.
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The full catalog
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⚙️ Developer UtilitiesFree
Beat frequency of two waves calculator
find the audible beat rate
K
POST /trig/beat-frequency$0.002⚙️ Developer UtilitiesFree
Negative-angle identity calculator
even and odd trig parity
P
POST /trig/negative-angle-identity$0.002⚙️ Developer UtilitiesFree
Supplementary angle calculator
find the angle that adds to 180°
B
POST /trig/supplementary-angle$0.002⚙️ Developer UtilitiesFree
Gudermannian function calculator
compute gd(x)
F
POST /trig/gudermannian$0.002⚙️ Developer UtilitiesFree
Haversine function calculator
hav(θ)=(1−cos θ)/2 = sin²(θ/2)
S
POST /trig/haversine-function$0.002⚙️ Developer UtilitiesFree
Is it a right triangle checker
three sides, Pythagoras test
P
POST /trig/is-right-triangle$0.002⚙️ Developer UtilitiesFree
Rafter length from pitch angle and run calculator
K
POST /trig/rafter-length$0.002⚙️ Developer UtilitiesFree
Resultant course with current calculator
vessel course and ground speed
F
POST /trig/resultant-course-current$0.002⚙️ Developer UtilitiesFree
Rotate point about a center calculator
free 2D trig
A
POST /trig/rotate-point-about-center$0.002⚙️ Developer UtilitiesFree
Superposition of two sinusoids calculator
same-frequency phasor sum
S
POST /trig/superpose-same-frequency$0.002⚙️ Developer UtilitiesFree
Thirty-sixty-ninety triangle solver
find every side
B
POST /trig/thirty-sixty-ninety$0.002⚙️ Developer UtilitiesFree
2D cross product magnitude calculator
signed determinant
B
POST /trig/cross-product-magnitude-2d$0.002⚙️ Developer UtilitiesFree
Frequency from period calculator
find cycles per unit interval
K
POST /trig/frequency-from-period$0.002⚙️ Developer UtilitiesFree
Sagitta of a circular arc calculator
height from radius and central angle
A
POST /trig/sagitta$0.002⚙️ Developer UtilitiesFree
Along-track distance great-circle calculator
spherical trigonometry, free
S
POST /trig/along-track-distance$0.002⚙️ Developer UtilitiesFree
Angle Between Two Bearings Calculator
Smallest Difference
K
POST /trig/angle-between-bearings$0.002⚙️ Developer UtilitiesFree
Evaluate trig expression at an angle
six-function calculator
B
POST /trig/evaluate-expression-at-angle$0.002⚙️ Developer UtilitiesFree
NATO mils to degrees calculator
artillery angle conversion free
A
POST /trig/mil-to-degrees$0.002⚙️ Developer UtilitiesFree
Simple harmonic motion position calculator
x(t) = A cos(ωt + φ)
P
POST /trig/simple-harmonic-position$0.002⚙️ Developer UtilitiesFree
Solar Elevation Angle Calculator
Sun Altitude from Latitude
F
POST /trig/solar-elevation-angle$0.002⚙️ Developer UtilitiesFree
Solar azimuth angle calculator from latitude, declination and hour angle
F
POST /trig/azimuth-of-sun$0.002⚙️ Developer UtilitiesFree
Critical angle total internal reflection calculator
B
POST /trig/critical-angle$0.002⚙️ Developer UtilitiesFree
Solar declination approximation calculator
cosine axial tilt model
A
POST /trig/declination-approx$0.002⚙️ Developer UtilitiesFree
Parallelogram diagonal calculator from sides and angle
F
POST /trig/diagonal-of-parallelogram$0.002⚙️ Developer UtilitiesFree
Distance to horizon calculator
range from observer height, free
P
POST /trig/horizon-distance$0.002⚙️ Developer UtilitiesFree
Isosceles triangle from leg and apex angle calculator
K
POST /trig/isosceles-triangle-from-apex$0.002⚙️ Developer UtilitiesFree
Tidal height sinusoid model
water level from high, low, and period
A
POST /trig/model-tide-sinusoid$0.002⚙️ Developer UtilitiesFree
Regular polygon apothem calculator from circumradius
K
POST /trig/regular-polygon-apothem$0.002⚙️ Developer UtilitiesFree
Tangent from line slope calculator
inclination angle in degrees
P
POST /trig/tangent-from-slope$0.002⚙️ Developer UtilitiesFree
Triangle height from base and two base angles calculator
S
POST /trig/triangle-height-two-angles$0.002⚙️ Developer UtilitiesFree
Triangle angle from side and altitude calculator
asin(h/s)
S
POST /trig/triangle-angle-from-side-altitude$0.002⚙️ Developer UtilitiesFree
Derivative of Logarithmic Function Calculator
F
POST /calculus/derivative-logarithm$0.002⚙️ Developer UtilitiesFree
Power Rule Derivative Calculator for a·x^n
B
POST /calculus/derivative-power-rule$0.002⚙️ Developer UtilitiesFree
Infinite limit from the right calculator for rational functions
K
POST /calculus/limit-infinite-from-right$0.002⚙️ Developer UtilitiesFree
Limit Product and Quotient Rule Calculator
F
POST /calculus/limit-product-quotient$0.002⚙️ Developer UtilitiesFree
Equation of tangent line calculator
find slope and intercept
K
POST /calculus/tangent-line-equation$0.002⚙️ Developer UtilitiesFree
Implicit Derivative of an Ellipse Calculator
B
POST /calculus/implicit-derivative-ellipse$0.002⚙️ Developer UtilitiesFree
Concave up intervals calculator
where p″(x) > 0 for a polynomial
S
POST /calculus/concave-up-intervals$0.002⚙️ Developer UtilitiesFree
Critical Points of a Polynomial Calculator
B
POST /calculus/critical-points-polynomial$0.002⚙️ Developer UtilitiesFree
Derivative sign at a point calculator
increasing or decreasing
K
POST /calculus/derivative-sign-at-point$0.002⚙️ Developer UtilitiesFree
Increasing or Decreasing at a Point Calculator
B
POST /calculus/increasing-decreasing-test$0.002⚙️ Developer UtilitiesFree
Inflection points of a polynomial calculator
K
POST /calculus/inflection-points-polynomial$0.002⚙️ Developer UtilitiesFree
Minimum Sum with a Fixed Product Optimization Calculator
F
POST /calculus/optimization-min-sum-fixed-product$0.002⚙️ Developer UtilitiesFree
Rolle's Theorem Point Finder Calculator
F
POST /calculus/rolle-theorem-point$0.002⚙️ Developer UtilitiesFree
Secant line slope calculator for two points
F
POST /calculus/secant-line-slope$0.002⚙️ Developer UtilitiesFree
Horizontal tangent points calculator
solve f′(x)=0 for a polynomial
S
POST /calculus/tangent-horizontal-points$0.002⚙️ Developer UtilitiesFree
Two-Point Gauss-Legendre Quadrature Calculator
F
POST /calculus/gauss-legendre-2point$0.002⚙️ Developer UtilitiesFree
Improper integral of exponential calculator
∫₀^∞ a e^{-kx} dx
S
POST /calculus/improper-integral-exponential$0.002⚙️ Developer UtilitiesFree
Indefinite Integral of Polynomial Calculator
B
POST /calculus/indefinite-integral-polynomial$0.002⚙️ Developer UtilitiesFree
Polynomial even/odd symmetry checker
classify by exponent parity
S
POST /calculus/polynomial-symmetry$0.002⚙️ Developer UtilitiesFree
Simpson's three-eighths rule calculator for definite integrals
K
POST /calculus/simpson-three-eighths$0.002⚙️ Developer UtilitiesFree
Accumulation Function Value Calculator
F
POST /calculus/accumulation-function$0.002⚙️ Developer UtilitiesFree
Center of Mass from Density Calculator
F
POST /calculus/center-of-mass-1d$0.002⚙️ Developer UtilitiesFree
Centroid X-Coordinate of a Region Calculator
B
POST /calculus/centroid-region-x$0.002⚙️ Developer UtilitiesFree
Finite geometric series partial sum
S_n = a(1−r^n)/(1−r)
S
POST /calculus/geometric-series-sum-finite$0.002⚙️ Developer UtilitiesFree
Moment of a Region About the X-Axis Calculator
B
POST /calculus/moment-region-x$0.002⚙️ Developer UtilitiesFree
Net Signed Area Calculator for Polynomials
K
POST /calculus/net-signed-area$0.002⚙️ Developer UtilitiesFree
Radius of convergence from coefficients calculator
K
POST /calculus/power-series-radius$0.002⚙️ Developer UtilitiesFree
Midpoint Riemann sum calculator
approximate ∫ₐᵇ f(x) dx
S
POST /calculus/riemann-sum-midpoint$0.002⚙️ Developer UtilitiesFree
Taylor Coefficients of Natural Log Calculator
B
POST /calculus/taylor-coefficients-ln$0.002No capabilities match your search.
How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
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Free tools
$0.00
On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
$0.002+
The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
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