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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
Bitwise OR calculator
compute a | b of two integers
P
POST /math/or$0.002⚙️ Developer UtilitiesFree
Pentagon calculator
regular pentagon area and perimeter
S
POST /math/pentagon$0.002⚙️ Developer UtilitiesFree
Percentage change calculator
signed % from old to new
A
POST /math/percentage-change$0.002⚙️ Developer UtilitiesFree
Percentage difference calculator
relative to the average
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POST /math/percentage-difference$0.002⚙️ Developer UtilitiesFree
Percent of time calculator
elapsed vs total duration
A
POST /math/percent-time$0.002⚙️ Developer UtilitiesFree
Percentage of a percentage calculator
X% of Y%
S
POST /math/percentage-of-percentage$0.002⚙️ Developer UtilitiesFree
Perfect square trinomial
factor ax²+bx+c if it is a square
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POST /math/perfect-square-trinomial$0.002⚙️ Developer UtilitiesFree
Rectangle perimeter from area and one side
P = 2(s + A/s)
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POST /math/perimeter-of-a-rectangle-with-given-area$0.002⚙️ Developer UtilitiesFree
Perimeter of a sector
arc plus two radii
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POST /math/perimeter-of-a-sector$0.002⚙️ Developer UtilitiesFree
Triangle perimeter from vertices
three coordinates, free
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POST /math/perimeter-of-a-triangle-with-vertices$0.002⚙️ Developer UtilitiesFree
Perimeter of a rectangle
P = 2(L + W) from length and width
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POST /math/perimeter-of-rectangle$0.002⚙️ Developer UtilitiesFree
Phase shift calculator
horizontal shift −C/B of a sinusoid
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POST /math/phase-shift$0.002⚙️ Developer UtilitiesFree
Polar decomposition calculator
orthogonal and PSD factors
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POST /math/polar-decomposition$0.002⚙️ Developer UtilitiesFree
Polar form of a complex number
magnitude and angle
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POST /math/polar-form$0.002⚙️ Developer UtilitiesFree
Polygon angle
interior and exterior
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POST /math/polygon-angle$0.002⚙️ Developer UtilitiesFree
Polynomial division calculator
quotient and remainder, free
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POST /math/polynomial-division$0.002⚙️ Developer UtilitiesFree
Polynomial graphing calculator
sample x-y points, free
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POST /math/polynomial-graphing$0.002⚙️ Developer UtilitiesFree
Power modulo calculator
remainder of base^exp mod m
A
POST /math/power-modulo$0.002⚙️ Developer UtilitiesFree
Power of a power calculator
(a^m)^n = a^(mn), free
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POST /math/power-of-a-power$0.002⚙️ Developer UtilitiesFree
Power-reducing identities calculator
sin²(θ) and cos²(θ)
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POST /math/power-reducing$0.002⚙️ Developer UtilitiesFree
Prisoner's dilemma calculator
both scores from one round
A
POST /math/prisoners-dilemma$0.002⚙️ Developer UtilitiesFree
Pyramid angle calculator
slant-edge to base from side and height
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POST /math/pyramid-angle$0.002⚙️ Developer UtilitiesFree
Pythagorean triples
generate primitives up to a hypotenuse
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POST /math/pythagorean-triples$0.002⚙️ Developer UtilitiesFree
QR decomposition
factor matrix into Q and R
A
POST /math/qr-decomposition$0.002⚙️ Developer UtilitiesFree
Quarter circle perimeter
P = r(π/2 + 2) from radius
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POST /math/quarter-circle-perimeter$0.002⚙️ Developer UtilitiesFree
Quaternion calculator
norm and conjugate of w + xi + yj + zk
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POST /math/quaternion$0.002⚙️ Developer UtilitiesFree
Simplify radical
√n to simplest form a√b, free
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POST /math/radical$0.002⚙️ Developer UtilitiesFree
Radius of a circle
r = C/(2π) from circumference, free
A
POST /math/radius-of-a-circle$0.002⚙️ Developer UtilitiesFree
Sphere radius calculator
from volume, surface or diameter
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POST /math/radius-of-sphere$0.002⚙️ Developer UtilitiesFree
Ratio of 2 numbers calculator
simplify a:b by GCD
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POST /math/ratio-of-2-numbers$0.002⚙️ Developer UtilitiesFree
Rational exponents calculator
evaluate a^(p/q), free
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POST /math/rational-exponents$0.002⚙️ Developer UtilitiesFree
Rationalize denominator calculator
rewrite a/√n, free
A
POST /math/rationalize-denominator$0.002⚙️ Developer UtilitiesFree
Reciprocal calculator
1/x for any finite non-zero number
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POST /math/reciprocal$0.002⚙️ Developer UtilitiesFree
Rectangle diagonal angle calculator
from length and width
A
POST /math/rectangle-diagonal-angle$0.002⚙️ Developer UtilitiesFree
Rectangular prism volume
V = l × w × h in cubic units, free
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POST /math/rectangular-prism-volume$0.002⚙️ Developer UtilitiesFree
Rectangular to polar
radius and angle in degrees
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POST /math/rectangular-to-polar$0.002⚙️ Developer UtilitiesFree
Regular polygon perimeter
P = n × side, n ≥ 3
A
POST /math/regular-polygon-perimeter$0.002⚙️ Developer UtilitiesFree
Relatively prime checker
test if two integers have gcd 1
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POST /math/relatively-prime$0.002⚙️ Developer UtilitiesFree
Right circular cone
volume surface and slant
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POST /math/right-circular-cone$0.002⚙️ Developer UtilitiesFree
Right rectangular pyramid
volume and surface from L, W, H
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POST /math/right-rectangular-pyramid$0.002⚙️ Developer UtilitiesFree
Right trapezoid area calculator
two bases and height, free
A
POST /math/right-trapezoid-area$0.002⚙️ Developer UtilitiesFree
Right triangle trigonometry
all remaining sides and angles
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POST /math/right-triangle-trigonometry$0.002⚙️ Developer UtilitiesFree
Rise over run calculator
slope as a fraction and a decimal
A
POST /math/rise-over-run$0.002⚙️ Developer UtilitiesFree
Round to the nearest hundred
free calculator
A
POST /math/round-to-the-nearest-hundred$0.002⚙️ Developer UtilitiesFree
Round to the nearest penny
half-up cents, free
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POST /math/round-to-the-nearest-penny$0.002⚙️ Developer UtilitiesFree
Round to the nearest ten
free calculator
A
POST /math/round-to-the-nearest-ten$0.002⚙️ Developer UtilitiesFree
Rounding calculator
half-up to N decimal places, free
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POST /math/rounding$0.002⚙️ Developer UtilitiesFree
Round to the nearest thousandth
three decimals, free
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POST /math/round-to-the-nearest-thousandth$0.002⚙️ Developer UtilitiesFree
SAS triangle solver
two sides and the included angle
A
POST /math/sas-triangle$0.002⚙️ Developer UtilitiesFree
Scatter plot calculator
correlation, slope and intercept
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POST /math/scatter-plot$0.002⚙️ Developer UtilitiesFree
Scientific notation
coefficient × 10^n, free
A
POST /math/scientific-notation$0.002⚙️ Developer UtilitiesFree
Segment addition postulate calculator
find a missing length
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POST /math/segment-addition-postulate$0.002⚙️ Developer UtilitiesFree
Segment area calculator
radius and central angle, free
A
POST /math/segment-area$0.002⚙️ Developer UtilitiesFree
Sig fig calculator
round to N significant figures, free
A
POST /math/sig-fig$0.002⚙️ Developer UtilitiesFree
Similar right triangles
find the missing corresponding side
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POST /math/similar-right-triangles$0.002⚙️ Developer UtilitiesFree
Simplify radicals calculator
√n as a√b, square-free, free
A
POST /math/simplify-radicals$0.002⚙️ Developer UtilitiesFree
Sine calculator
sin(θ) in degrees or radians, free
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POST /math/sin$0.002⚙️ Developer UtilitiesFree
Sin degrees calculator
sine of an angle in degrees, free
A
POST /math/sin-degrees$0.002⚙️ Developer UtilitiesFree
Sine function calculator
y = a·sin(bx + c) at x, free
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POST /math/sine-function$0.002⚙️ Developer UtilitiesFree
Sin triangle calculator
missing side or angle using sine
A
POST /math/sin-triangle$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
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
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+
Top up your balance and spend it across web, API and the app. It never expires.