ForHosting KIT
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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
Search or filter by category. Every capability is its own endpoint with a published price.
⚙️ Developer UtilitiesFree
Legendre symbol (a/p)
quadratic residuosity mod odd prime
A
POST /numth/legendre-symbol$0.002⚙️ Developer UtilitiesFree
Mersenne number checker
compute 2^p−1 and Lucas-Lehmer primality
A
POST /numth/mersenne-number$0.002⚙️ Developer UtilitiesFree
Modular exponentiation calculator
base^exp mod m (fast BigInt)
P
POST /numth/modular-exponentiation$0.002⚙️ Developer UtilitiesFree
Modular multiplicative inverse
a⁻¹ mod m via extended Euclidean
A
POST /numth/modular-inverse$0.002⚙️ Developer UtilitiesFree
Next prime after n
smallest prime strictly greater than n
A
POST /numth/next-prime$0.002⚙️ Developer UtilitiesFree
Pandigital number checker
each base digit once, missing digits
P
POST /numth/pandigital-checker$0.002⚙️ Developer UtilitiesFree
Previous prime finder
largest prime strictly less than n
P
POST /numth/prev-prime$0.002⚙️ Developer UtilitiesFree
Prime counting function π(n)
count primes ≤ n by sieve
A
POST /numth/prime-counting$0.002⚙️ Developer UtilitiesFree
Quadratic residue checker
is a a square mod m, list residues
A
POST /numth/quadratic-residue$0.002⚙️ Developer UtilitiesFree
Radix converter
change integer bases 2–36, free
A
POST /numth/radix-convert$0.002⚙️ Developer UtilitiesFree
Factorial trailing zeros
count zeros of n! via powers of five
A
POST /numth/trailing-zeros-factorial$0.002⚙️ Developer UtilitiesFree
Twin prime checker
test (n, n+2) and list pairs up to a limit
A
POST /numth/twin-primes$0.002⚙️ Developer UtilitiesFree
Brewster angle calculator
polarization angle from n₁, n₂, free
P
POST /optics/brewster-angle$0.002⚙️ Developer UtilitiesFree
Critical angle calculator
total internal reflection from two indices
A
POST /optics/critical-angle$0.002⚙️ Developer UtilitiesFree
Diffraction grating calculator
angle from d, λ, order m, free
P
POST /optics/diffraction-grating$0.002⚙️ Developer UtilitiesFree
F-stop calculator
f-number from focal length and aperture diameter, free
A
POST /optics/f-number$0.002⚙️ Developer UtilitiesFree
Lens magnification calculator
linear m = −v/u for lenses and mirrors, free
A
POST /optics/lens-magnification$0.002⚙️ Developer UtilitiesFree
Lens power calculator
diopters from focal length (m), free
P
POST /optics/lens-power$0.002⚙️ Developer UtilitiesFree
Mirror equation calculator
image distance & magnification from f and do
A
POST /optics/mirror-equation$0.002⚙️ Developer UtilitiesFree
Single-slit diffraction calculator
angular position of minima from a, λ and order m, free
A
POST /optics/single-slit-diffraction$0.002⚙️ Developer UtilitiesFree
Snell's law calculator
refraction angle from n1, n2 and incidence, free
A
POST /optics/snell-law$0.002⚙️ Developer UtilitiesFree
Telescope magnification calculator
angular M from objective & eyepiece
A
POST /optics/telescope-magnification$0.002⚙️ Developer UtilitiesFree
Beat frequency calculator
f_beat = |f1 − f2| free, rejects negative Hz
A
POST /phys/beat-frequency$0.002⚙️ Developer UtilitiesFree
Doppler effect calculator
observed frequency and frequency shift, free
P
POST /phys/doppler-effect$0.002⚙️ Developer UtilitiesFree
Doppler shift sound calculator
perceived frequency from relative speed
A
POST /phys/doppler-sound$0.002⚙️ Developer UtilitiesFree
Period to frequency calculator
convert T↔f (Hz) free, rejects zero
A
POST /phys/period-frequency$0.002⚙️ Developer UtilitiesFree
Pipe resonance calculator
open/closed pipe fundamental and harmonics
A
POST /phys/pipe-resonance$0.002⚙️ Developer UtilitiesFree
Sound intensity calculator
I = P / (4πr²) in W/m², free
P
POST /phys/sound-intensity$0.002⚙️ Developer UtilitiesFree
Decibel calculator
sound intensity level L=10·log₁₀(I/I₀) free, rejects non-positive I
A
POST /phys/sound-intensity-db$0.002⚙️ Developer UtilitiesFree
Speed of sound calculator
dry air from temperature (m/s)
A
POST /phys/speed-of-sound-air$0.002⚙️ Developer UtilitiesFree
Standing wave calculator
nodes and wavelength from harmonic number and string length, free
A
POST /phys/standing-wave$0.002⚙️ Developer UtilitiesFree
Wave speed on a string calculator
v = √(T/μ), free
P
POST /phys/wave-on-string-speed$0.002⚙️ Developer UtilitiesFree
Wave speed calculator
v=fλ from frequency and wavelength (or solve any)
A
POST /phys/wave-speed$0.002⚙️ Developer UtilitiesFree
Birthday paradox calculator
shared day probability for n people
A
POST /prob/birthday-paradox$0.002⚙️ Developer UtilitiesFree
Coin flip probability
exactly k heads in n flips, free
A
POST /prob/coin-flip$0.002⚙️ Developer UtilitiesFree
Conditional probability calculator
P(A|B) and independence test
P
POST /prob/conditional-probability$0.002⚙️ Developer UtilitiesFree
Dice sum probability
every total for k dice with s sides
A
POST /prob/dice-sum$0.002⚙️ Developer UtilitiesFree
Dice roll probability
exact or at-least target sum with k s-sided dice
P
POST /prob/dice-target$0.002⚙️ Developer UtilitiesFree
Expected value calculator
mean, variance and standard deviation
A
POST /prob/expected-value$0.002⚙️ Developer UtilitiesFree
Geometric distribution calculator
P(first success on trial k) and E[X]
P
POST /prob/geometric-distribution$0.002⚙️ Developer UtilitiesFree
Hypergeometric probability
k successes in n draws, free
A
POST /prob/hypergeometric$0.002⚙️ Developer UtilitiesFree
Odds to probability converter
a to b, percent, free
A
POST /prob/odds-converter$0.002⚙️ Developer UtilitiesFree
Poisson probability calculator
P(X=k), CDF, mean and variance
A
POST /prob/poisson-distribution$0.002⚙️ Developer UtilitiesFree
Poker hand odds
exact pair, flush, full house probability
A
POST /prob/poker-odds$0.002⚙️ Developer UtilitiesFree
Beam deflection calculator
simply supported max δ = PL³/(48EI)
A
POST /sci/beam-deflection$0.002⚙️ Developer UtilitiesFree
Bending stress calculator
σ = My/I elastic flexure formula
A
POST /sci/bending-stress$0.002⚙️ Developer UtilitiesFree
Gear ratio calculator
teeth counts to GR and output speed, free
P
POST /sci/gear-ratio$0.002⚙️ Developer UtilitiesFree
Shear stress calculator
τ = F/A in pascals, free
P
POST /sci/shear-stress$0.002⚙️ Developer UtilitiesFree
Stress calculator
mechanical stress σ = F/A in pascals and megapascals, free
A
POST /sci/stress$0.002⚙️ Developer UtilitiesFree
Thermal stress calculator
constrained bar σ = E·α·ΔT in Pa and MPa, free
A
POST /sci/thermal-stress$0.002⚙️ Developer UtilitiesFree
Young's modulus calculator
elasticity E = σ/ε, solve stress, strain or E, free
A
POST /sci/youngs-modulus$0.002⚙️ Developer UtilitiesFree
Coefficient of variation calculator
CV ratio and percentage from a list
A
POST /stat/coefficient-variation$0.002⚙️ Developer UtilitiesFree
Five-number summary calculator
min, Q1, median, Q3, max of a data set, free
A
POST /stat/five-number-summary$0.002⚙️ Developer UtilitiesFree
Geometric mean calculator
n-th root of the product of positive numbers, free
A
POST /stat/geometric-mean$0.002⚙️ Developer UtilitiesFree
Harmonic mean calculator
reciprocal average of positive numbers
P
POST /stat/harmonic-mean$0.002⚙️ Developer UtilitiesFree
Linear regression calculator
least-squares slope, intercept and R², free
A
POST /stat/linear-regression$0.002⚙️ Developer UtilitiesFree
Mean median mode calculator
average, mid value, most common, range
P
POST /stat/mean-median-mode$0.002⚙️ Developer UtilitiesFree
Quartile and IQR calculator
Q1 Q2 Q3, range and outlier fences
P
POST /stat/quartiles$0.002⚙️ Developer UtilitiesFree
Skewness and kurtosis calculator
sample shape of a data set
P
POST /stat/skewness-kurtosis$0.002⚙️ Developer UtilitiesFree
Variance calculator
population and sample variance with mean
A
POST /stat/variance$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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Per task
$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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