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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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6channels
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The full catalog
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⚙️ Developer UtilitiesFree
Double factorial calculator
compute n!! with BigInt precision
A
POST /math/double-factorial$0.002⚙️ Developer UtilitiesFree
Factorial calculator
n! exact BigInt product, free
A
POST /math/factorial-calculator$0.002⚙️ Developer UtilitiesFree
Fibonacci number calculator
nth term and sequence, free
A
POST /math/fibonacci$0.002⚙️ Developer UtilitiesFree
Sum of Fibonacci series
first n terms equal F(n+2)−1
A
POST /math/fibonacci-sum$0.002⚙️ Developer UtilitiesFree
Infinite geometric series sum
S = a/(1−r), free calculator
A
POST /math/geometric-series-sum$0.002⚙️ Developer UtilitiesFree
Hexagonal number calculator
H(n)=n(2n−1) and membership test, free
A
POST /math/hexagonal-number$0.002⚙️ Developer UtilitiesFree
Look-and-say sequence
n-th term from a seed by run-length
A
POST /math/look-and-say$0.002⚙️ Developer UtilitiesFree
Padovan sequence calculator
n-th Padovan number P(n)
P
POST /math/padovan-number$0.002⚙️ Developer UtilitiesFree
Pentagonal number calculator
P(n)=n(3n−1)/2 and membership test
A
POST /math/pentagonal-number$0.002⚙️ Developer UtilitiesFree
Polygonal number calculator
n-th s-gonal figurate number
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POST /math/polygonal-number$0.002⚙️ Developer UtilitiesFree
Primorial calculator
n# product of primes ≤ n, free
A
POST /math/primorial$0.002⚙️ Developer UtilitiesFree
Square pyramidal number
sum of first n squares n(n+1)(2n+1)/6
A
POST /math/pyramidal-number$0.002⚙️ Developer UtilitiesFree
Stern diatomic / Stern-Brocot sequence
n-th term s(n)
P
POST /math/stern-brocot$0.002⚙️ Developer UtilitiesFree
Sum of first n even numbers
2+4+…+2n = n(n+1)
A
POST /math/sum-of-even$0.002⚙️ Developer UtilitiesFree
Sum of first n odd numbers
equals n squared, free calculator
A
POST /math/sum-of-odd$0.002⚙️ Developer UtilitiesFree
Sum of first n squares
1²+2²+…+n² = n(n+1)(2n+1)/6
A
POST /math/sum-of-squares$0.002⚙️ Developer UtilitiesFree
Sylvester sequence calculator
nth term with BigInt, free
A
POST /math/sylvester-sequence$0.002⚙️ Developer UtilitiesFree
Angular velocity calculator
ω from angle & time or RPM, free
P
POST /mech/angular-velocity$0.002⚙️ Developer UtilitiesFree
Atwood machine calculator
acceleration & tension, free in browser
P
POST /mech/atwood-machine$0.002⚙️ Developer UtilitiesFree
Average velocity calculator
displacement over time in m/s and km/h free
A
POST /mech/average-velocity$0.002⚙️ Developer UtilitiesFree
Banked curve calculator
ideal banking angle from radius and speed
A
POST /mech/banked-curve$0.002⚙️ Developer UtilitiesFree
Centripetal acceleration calculator
a = v²/r from speed and radius free
A
POST /mech/centripetal-acceleration$0.002⚙️ Developer UtilitiesFree
Centripetal force calculator
F=mv²/r from mass, speed, and radius
A
POST /mech/centripetal-force$0.002⚙️ Developer UtilitiesFree
Coefficient of friction calculator
μ = Ff / N, free in browser
P
POST /mech/coefficient-of-friction$0.002⚙️ Developer UtilitiesFree
Elastic collision calculator
final velocities of two masses in 1D free
A
POST /mech/elastic-collision$0.002⚙️ Developer UtilitiesFree
Force calculator
F=ma from mass and acceleration (or solve mass/accel)
A
POST /mech/force-mass-accel$0.002⚙️ Developer UtilitiesFree
Free fall calculator
fall time and impact velocity from rest
A
POST /mech/free-fall$0.002⚙️ Developer UtilitiesFree
Hooke's law calculator
spring force F=kx (or solve k or x)
A
POST /mech/hookes-law$0.002⚙️ Developer UtilitiesFree
Horizontal projectile motion calculator
fall time, range and impact velocity free
A
POST /mech/horizontal-projectile$0.002⚙️ Developer UtilitiesFree
Impulse calculator
impulse and Δp from force and contact time
A
POST /mech/impulse$0.002⚙️ Developer UtilitiesFree
Inclined plane calculator
acceleration and normal force free
A
POST /mech/inclined-plane$0.002⚙️ Developer UtilitiesFree
Kinematics distance calculator
displacement from velocity, acceleration, time
A
POST /mech/kinematics-distance$0.002⚙️ Developer UtilitiesFree
Final velocity calculator
v = u + at, free in browser
P
POST /mech/kinematics-velocity$0.002⚙️ Developer UtilitiesFree
Kinetic energy calculator
KE = ½mv², free in browser
P
POST /mech/kinetic-energy$0.002⚙️ Developer UtilitiesFree
Moment of inertia calculator
ring, disc, sphere, rod, free
P
POST /mech/moment-of-inertia$0.002⚙️ Developer UtilitiesFree
Momentum calculator
linear momentum p=mv in kg·m/s free
A
POST /mech/momentum$0.002⚙️ Developer UtilitiesFree
Newton's second law calculator
F = ma, free in browser
P
POST /mech/newton-second-law$0.002⚙️ Developer UtilitiesFree
Pendulum length calculator
required length from period and g free
A
POST /mech/pendulum-length$0.002⚙️ Developer UtilitiesFree
Power calculator
mechanical power in watts and horsepower from work and time
A
POST /mech/power$0.002⚙️ Developer UtilitiesFree
Power from force and velocity
P=Fv in watts free
A
POST /mech/power-force-velocity$0.002⚙️ Developer UtilitiesFree
Projectile from height calculator
range and flight time above ground
A
POST /mech/projectile-launch-from-height$0.002⚙️ Developer UtilitiesFree
Pulley mechanical advantage calculator
ideal IMA and effort force free
A
POST /mech/pulley-mechanical-advantage$0.002⚙️ Developer UtilitiesFree
Rotational kinetic energy calculator
KE=½Iω² in joules free
A
POST /mech/rotational-kinetic-energy$0.002⚙️ Developer UtilitiesFree
Spring constant calculator
k = F/x, free in browser
P
POST /mech/spring-constant$0.002⚙️ Developer UtilitiesFree
Terminal velocity calculator
mass, drag, density and area free
A
POST /mech/terminal-velocity$0.002⚙️ Developer UtilitiesFree
Torque calculator
τ = rF sin(θ) in newton-metres
A
POST /mech/torque$0.002⚙️ Developer UtilitiesFree
Work done calculator
W=Fd cos θ in joules free
A
POST /mech/work-done$0.002⚙️ Developer UtilitiesFree
Aliquot sum calculator
proper divisors, perfect / deficient / abundant
P
POST /numth/aliquot-sum$0.002⚙️ Developer UtilitiesFree
Amicable numbers checker
test if two integers form an amicable pair
A
POST /numth/amicable-numbers$0.002⚙️ Developer UtilitiesFree
Armstrong number checker
narcissistic numbers, digit power sum
P
POST /numth/armstrong-number$0.002⚙️ Developer UtilitiesFree
Automorphic number checker
does n² end with n, free
A
POST /numth/automorphic-number$0.002⚙️ Developer UtilitiesFree
Digit sum calculator
sum digits in any base, free
A
POST /numth/digit-sum$0.002⚙️ Developer UtilitiesFree
Digital root calculator
repeated digit sum and additive persistence
A
POST /numth/digital-root$0.002⚙️ Developer UtilitiesFree
Number of divisors calculator
tau(n) from prime factors
A
POST /numth/divisor-count$0.002⚙️ Developer UtilitiesFree
Sum of divisors calculator
sigma(n) from prime factors
P
POST /numth/divisor-sum$0.002⚙️ Developer UtilitiesFree
Euler's totient φ(n)
count coprimes from prime factors
A
POST /numth/euler-totient$0.002⚙️ Developer UtilitiesFree
Extended Euclidean calculator
gcd and Bézout coefficients x, y
A
POST /numth/extended-euclidean$0.002⚙️ Developer UtilitiesFree
Factorial prime factorization
n! factors via Legendre formula
P
POST /numth/factorial-prime-factors$0.002⚙️ Developer UtilitiesFree
Happy number checker
sum of squares of digits until 1 or a cycle
A
POST /numth/happy-number$0.002⚙️ Developer UtilitiesFree
Jacobi symbol calculator
(a/n) via quadratic reciprocity
P
POST /numth/jacobi-symbol$0.002No capabilities match your search.
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1
Get your key
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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.
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$0.002+
The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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$10.00+
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