ForHosting KIT

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.

REST APILive
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TelegramLive
iOS & AndroidBuilding
WhatsAppComing
7554ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesVolume to density calculatorρ=m/V from mass and volumeAabuela$0.002Open phys.volume_to_densityNew⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulationNew⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_numberNew⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocityNew⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficientNew⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rateNew⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strainNew⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmissionNew⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffnessNew⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_springNew⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertiaNew⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation

The full catalog

Search or filter by category. Every capability is its own endpoint with a published price.

⚙️ Developer UtilitiesFree
Telescoping series sum
Σ 1/(k(k+1)) = n/(n+1), free
Ssamurai
POST /math/telescoping-sum$0.002
⚙️ Developer UtilitiesFree
Tetrahedral number calculator
n-th Te_n = n(n+1)(n+2)/6, free
Ssamurai
POST /math/tetrahedral-number$0.002
⚙️ Developer UtilitiesFree
Acceleration calculator
a = Δv/t average acceleration, free
Ssamurai
POST /mech/acceleration$0.002
⚙️ Developer UtilitiesFree
Circular motion velocity calculator
v = 2πr/T tangential speed, free
Ssamurai
POST /mech/circular-velocity$0.002
⚙️ Developer UtilitiesFree
Free fall time calculator
t = √(2d/g) from rest, free
Ssamurai
POST /mech/free-fall-time$0.002
⚙️ Developer UtilitiesFree
Friction force calculator
F = μ·N from coefficient and normal force, free
Ssamurai
POST /mech/friction-force$0.002
⚙️ Developer UtilitiesFree
Inelastic collision calculator
common final velocity v_f, free
Ssamurai
POST /mech/inelastic-collision$0.002
⚙️ Developer UtilitiesFree
Lever calculator
effort force for a balanced lever, free
Ssamurai
POST /mech/lever$0.002
⚙️ Developer UtilitiesFree
Gravitational potential energy calculator
PE = m·g·h in joules, free
Ssamurai
POST /mech/potential-energy$0.002
⚙️ Developer UtilitiesFree
Projectile max height calculator
H = v₀² sin²θ / (2g), free
Ssamurai
POST /mech/projectile-max-height$0.002
⚙️ Developer UtilitiesFree
RPM to linear speed calculator
v = 2πr·(rpm/60) rim speed, free
Ssamurai
POST /mech/rpm-to-linear$0.002
⚙️ Developer UtilitiesFree
Spring potential energy calculator
PE = ½kx² in joules, free
Ssamurai
POST /mech/spring-potential-energy$0.002
⚙️ Developer UtilitiesFree
Velocity components calculator
horizontal vx and vertical vy, free
Ssamurai
POST /mech/velocity-components$0.002
⚙️ Developer UtilitiesFree
Weight calculator
W = m·g force in newtons, free
Ssamurai
POST /mech/weight-force$0.002
⚙️ Developer UtilitiesFree
Abundant number checker
aliquot sum and abundance amount, free
Ssamurai
POST /numth/abundant-number$0.002
⚙️ Developer UtilitiesFree
Carmichael function calculator
compute λ(n) for any positive integer
Ssamurai
POST /numth/carmichael-function$0.002
⚙️ Developer UtilitiesFree
Chinese remainder theorem solver
solve x ≡ ai mod ni, free
Ssamurai
POST /numth/chinese-remainder$0.002
⚙️ Developer UtilitiesFree
Collatz conjecture calculator
3n+1 sequence, steps and peak, free
Ssamurai
POST /numth/collatz$0.002
⚙️ Developer UtilitiesFree
Coprime checker
test gcd(a,b)=1 and return the gcd, free
Ssamurai
POST /numth/coprime-checker$0.002
⚙️ Developer UtilitiesFree
Kaprekar number checker
square splits that add back to n, free
Ssamurai
POST /numth/kaprekar-number$0.002
⚙️ Developer UtilitiesFree
Nth prime calculator
find the n-th prime number, free
Ssamurai
POST /numth/nth-prime$0.002
⚙️ Developer UtilitiesFree
Prime factorization calculator
factor any integer into prime powers
Ssamurai
POST /numth/prime-factorization$0.002
⚙️ Developer UtilitiesFree
Primitive root calculator
smallest generator mod prime p, free
Ssamurai
POST /numth/primitive-root$0.002
⚙️ Developer UtilitiesFree
Smith number checker
digit sum vs prime-factor digit sum, free
Ssamurai
POST /numth/smith-number$0.002
⚙️ Developer UtilitiesFree
Double slit calculator
fringe spacing Δy = λL/d, free
Ssamurai
POST /optics/double-slit$0.002
⚙️ Developer UtilitiesFree
Focal length calculator
lens f from object & image distance, free
Ssamurai
POST /optics/focal-length$0.002
⚙️ Developer UtilitiesFree
Refractive index calculator
n = c/v or speed from n, free
Ssamurai
POST /optics/refractive-index$0.002
⚙️ Developer UtilitiesFree
Thin lens calculator
image distance & magnification, free
Ssamurai
POST /optics/thin-lens$0.002
⚙️ Developer UtilitiesFree
Sound level distance calculator
inverse-square dB from one range, free
Ssamurai
POST /phys/decibel-distance$0.002
⚙️ Developer UtilitiesFree
Frequency calculator
f = v / λ from wave speed and wavelength, free
Ssamurai
POST /phys/frequency$0.002
⚙️ Developer UtilitiesFree
String harmonic frequency calculator
f₁ = (1/2L)√(T/μ), free
Ssamurai
POST /phys/harmonic-string$0.002
⚙️ Developer UtilitiesFree
Bayes theorem calculator
posterior from prior, sensitivity, FPR, free
Ssamurai
POST /prob/bayes-theorem$0.002
⚙️ Developer UtilitiesFree
Binomial probability calculator
P(X=k), CDF, mean, variance, free
Ssamurai
POST /prob/binomial-distribution$0.002
⚙️ Developer UtilitiesFree
Lottery odds calculator
match m of r in n-choose-r, optional bonus, free
Ssamurai
POST /prob/lottery-odds$0.002
⚙️ Developer UtilitiesFree
Negative binomial calculator
P(r-th success on trial k), free
Ssamurai
POST /prob/negative-binomial$0.002
⚙️ Developer UtilitiesFree
Factor of safety calculator
n = ultimate strength / working stress, free
Ssamurai
POST /sci/factor-of-safety$0.002
⚙️ Developer UtilitiesFree
Poisson's ratio calculator
ν = −ε_lateral/ε_axial from strains, free
Ssamurai
POST /sci/poisson-ratio$0.002
⚙️ Developer UtilitiesFree
Engineering strain calculator
ε = ΔL/L₀ as ratio and percent, free
Ssamurai
POST /sci/strain$0.002
⚙️ Developer UtilitiesFree
Correlation coefficient calculator
Pearson r for two series, free
Ssamurai
POST /stat/correlation$0.002
⚙️ Developer UtilitiesFree
Mean absolute deviation calculator
MAD about the mean, free
Ssamurai
POST /stat/mean-absolute-deviation$0.002
⚙️ Developer UtilitiesFree
Percentile calculator
k-th percentile & rank by linear, free
Ssamurai
POST /stat/percentile$0.002
⚙️ Developer UtilitiesFree
Standard deviation calculator
population & sample σ, variance, free
Ssamurai
POST /stat/standard-deviation$0.002
⚙️ Developer UtilitiesFree
Convert to alternating case
aLtErNaTiNg text converter, free
Ssamurai
POST /str/alternating-case$0.002
⚙️ Developer UtilitiesFree
Convert to camelCase
phrase to camelCase converter, free
Ssamurai
POST /str/camel-case$0.002
⚙️ Developer UtilitiesFree
Count characters
with/without spaces and UTF-8 bytes, free
Ssamurai
POST /str/char-count$0.002
⚙️ Developer UtilitiesFree
Convert to CONSTANT_CASE
phrase to SCREAMING_SNAKE_CASE, free
Ssamurai
POST /str/constant-case$0.002
⚙️ Developer UtilitiesFree
Count vowels and consonants
digits and other chars too, free
Ssamurai
POST /str/count-vowels$0.002
⚙️ Developer UtilitiesFree
Word frequency counter
count and rank words in text, free
Ssamurai
POST /str/frequency$0.002
⚙️ Developer UtilitiesFree
Remove all whitespace
strip spaces, tabs, line breaks free
Ssamurai
POST /str/remove-whitespace$0.002
⚙️ Developer UtilitiesFree
Repeat text
string repeater with optional separator, free
Ssamurai
POST /str/repeat$0.002
⚙️ Developer UtilitiesFree
Text to slug
URL-friendly titles with hyphens, free
Ssamurai
POST /str/slugify$0.002
⚙️ Developer UtilitiesFree
Convert to uppercase
all-caps text converter, free
Ssamurai
POST /str/uppercase$0.002
⚙️ Developer UtilitiesFree
Boiling point altitude calculator
water Tb vs elevation or pressure, free
Ssamurai
POST /thermo/boiling-point-altitude$0.002
⚙️ Developer UtilitiesFree
Combined gas law calculator
P₁V₁/T₁ = P₂V₂/T₂, free
Ssamurai
POST /thermo/combined-gas-law$0.002
⚙️ Developer UtilitiesFree
Coefficient of performance calculator
COP = Q/W refrigerator &, free
Ssamurai
POST /thermo/cop-refrigerator$0.002
⚙️ Developer UtilitiesFree
Volumetric flow rate calculator
Q = A·v pipe discharge, free
Ssamurai
POST /thermo/flow-rate$0.002
⚙️ Developer UtilitiesFree
Carnot efficiency calculator
η = 1 − Tc/Th heat engine limit, free
Ssamurai
POST /thermo/heat-engine-efficiency$0.002
⚙️ Developer UtilitiesFree
Latent heat calculator
Q = mL phase-change energy, free
Ssamurai
POST /thermo/latent-heat$0.002
⚙️ Developer UtilitiesFree
Poiseuille flow calculator
Q = π r⁴ ΔP / (8 μ L), free
Ssamurai
POST /thermo/poiseuille-flow$0.002
⚙️ Developer UtilitiesFree
Stefan-Boltzmann calculator
P = εσAT⁴ radiated power, free
Ssamurai
POST /thermo/stefan-boltzmann$0.002

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.

Balance
$10.00+

Top up your balance and spend it across web, API and the app. It never expires.