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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
Cramer's V calculator
association strength from a contingency table
B
POST /stat/cramers-v$0.002⚙️ Developer UtilitiesFree
Polynomial regression calculator
least-squares coefficients
K
POST /stat/polynomial-regression$0.002⚙️ Developer UtilitiesFree
Regression residuals calculator
observed minus predicted values
B
POST /stat/regression-residuals$0.002⚙️ Developer UtilitiesFree
Kendall's W concordance calculator for ranked data
K
POST /stat/kendall-w$0.002⚙️ Developer UtilitiesFree
Total sum of squares calculator
squared deviations from the mean
B
POST /stat/total-sum-squares$0.002⚙️ Developer UtilitiesFree
Conditional expectation calculator
expected value given an event
K
POST /stat/conditional-expectation$0.002⚙️ Developer UtilitiesFree
Joint probability of two events calculator
independent events
B
POST /stat/joint-probability-two$0.002⚙️ Developer UtilitiesFree
Poker hand probability calculator
exact five-card odds
B
POST /stat/poker-hand-odds$0.002⚙️ Developer UtilitiesFree
Binomial At Most Probability Calculator
B
POST /stat/binomial-at-most$0.002⚙️ Developer UtilitiesFree
Geometric PMF calculator
first success on trial k
K
POST /stat/geometric-pmf$0.002⚙️ Developer UtilitiesFree
Probability Exactly One Event Calculator
Find P(A or B, Not Both)
K
POST /stat/probability-exactly-one$0.002⚙️ Developer UtilitiesFree
Chi-Square Critical Value Calculator
K
POST /stat/chi-square-critical$0.002⚙️ Developer UtilitiesFree
Discrete uniform mean and variance calculator
B
POST /stat/discrete-uniform-mean-variance$0.002⚙️ Developer UtilitiesFree
Normal probability between values calculator
K
POST /stat/normal-between$0.002⚙️ Developer UtilitiesFree
Z-score to percentile calculator
standard normal percentile
B
POST /stat/z-to-percentile$0.002⚙️ Developer UtilitiesFree
Confidence Interval for the Difference of Proportions Calculator
B
POST /stat/ci-diff-proportions$0.002⚙️ Developer UtilitiesFree
F Distribution CDF Calculator
B
POST /stat/f-cdf$0.002⚙️ Developer UtilitiesFree
Lognormal Distribution CDF Calculator
K
POST /stat/lognormal-cdf$0.002⚙️ Developer UtilitiesFree
Confidence Interval for a Ratio of Variances Calculator
B
POST /stat/ci-ratio-variances$0.002⚙️ Developer UtilitiesFree
Sample Size for a Mean Calculator
K
POST /stat/sample-size-mean$0.002⚙️ Developer UtilitiesFree
Standard Error of Difference of Proportions Calculator
K
POST /stat/se-diff-proportions$0.002⚙️ Developer UtilitiesFree
F Test for Two Variances Calculator
F Statistic and P-Value
K
POST /stat/f-test-variances$0.002⚙️ Developer UtilitiesFree
Levene Test Calculator
Statistic and P-Value
K
POST /stat/levene-test$0.002⚙️ Developer UtilitiesFree
Wilcoxon signed-rank test calculator
statistic and p-value
B
POST /stat/wilcoxon-signed-rank$0.002⚙️ Developer UtilitiesFree
Two-Proportion Z-Test Calculator
B
POST /stat/z-test-two-proportions$0.002⚙️ Developer UtilitiesFree
Eta squared calculator
variance explained from sums of squares
B
POST /stat/eta-squared$0.002⚙️ Developer UtilitiesFree
Odds Ratio Calculator for a 2x2 Table
K
POST /stat/odds-ratio$0.002⚙️ Developer UtilitiesFree
Weighted moving average calculator
sliding weighted mean
B
POST /stat/weighted-moving-average$0.002⚙️ Developer UtilitiesFree
Atkinson Index Calculator for Income Inequality
B
POST /stat/atkinson-index$0.002⚙️ Developer UtilitiesFree
Double Exponential Smoothing Calculator
Holt Forecast
K
POST /stat/double-exponential-smoothing$0.002⚙️ Developer UtilitiesFree
Kullback-Leibler Divergence Calculator for Probability Distributions
K
POST /stat/kl-divergence$0.002⚙️ Developer UtilitiesFree
Two-argument arctangent calculator in degrees
atan2(y, x)
B
POST /trig/atan2-degrees$0.002⚙️ Developer UtilitiesFree
Cotangent of an angle in radians calculator
K
POST /trig/cot-radians$0.002⚙️ Developer UtilitiesFree
Right triangle from hypotenuse and angle calculator
K
POST /trig/right-triangle-hypotenuse-angle$0.002⚙️ Developer UtilitiesFree
Sine of an angle in radians calculator
decimal result
B
POST /trig/sin-radians$0.002⚙️ Developer UtilitiesFree
Ladder angle against wall calculator
length and base distance
K
POST /trig/ladder-angle$0.002⚙️ Developer UtilitiesFree
Shadow length from sun angle calculator
B
POST /trig/shadow-length$0.002⚙️ Developer UtilitiesFree
SSA number of triangles calculator
zero, one, or two
B
POST /trig/ssa-number-of-solutions$0.002⚙️ Developer UtilitiesFree
Cosine of a difference calculator
evaluate cos(A − B)
K
POST /trig/cos-difference$0.002⚙️ Developer UtilitiesFree
Cosine Half-Angle Calculator
Choose the Correct Quadrant Sign
B
POST /trig/cos-half-angle$0.002⚙️ Developer UtilitiesFree
Solve A sin(Bx) + C equation calculator
B
POST /trig/solve-asinbxc-equation$0.002⚙️ Developer UtilitiesFree
Sum-to-product sine calculator
factor sin A + sin B
K
POST /trig/sum-to-product-sin$0.002⚙️ Developer UtilitiesFree
Triangle area from two sides and included angle calculator
K
POST /trig/area-sas$0.002⚙️ Developer UtilitiesFree
Radians to gradians conversion calculator
rad to gon
K
POST /trig/rad-to-gradian$0.002⚙️ Developer UtilitiesFree
Midpoint of polar coordinates calculator
B
POST /trig/polar-midpoint$0.002⚙️ Developer UtilitiesFree
Exponential growth model solution calculator
evaluate A(t)
B
POST /calculus/exponential-growth-solution$0.002⚙️ Developer UtilitiesFree
Runge-Kutta 2 ODE Solver Calculator
B
POST /calculus/rk2-method$0.002⚙️ Developer UtilitiesFree
Involute function
tan(a) minus a for a pressure angle in radians
G
POST /math/involute-function$0.002⚙️ Developer UtilitiesFree
Irregular polygon area calculator
shoelace formula from vertices
H
POST /math/irregular-polygon-area$0.002⚙️ Developer UtilitiesFree
Irregular trapezoid area calculator
two parallel sides and height, free
H
POST /math/irregular-trapezoid-area$0.002⚙️ Developer UtilitiesFree
Is modulo associative?
compare (a % b) % c vs a % (b % c)
G
POST /math/is-modulo-associative$0.002⚙️ Developer UtilitiesFree
Isosceles right triangle calculator
leg or hypotenuse from one known side
H
POST /math/isosceles-right-triangle$0.002⚙️ Developer UtilitiesFree
Isosceles triangle angles
base angles from the vertex angle, in degrees
G
POST /math/isosceles-triangle-angles$0.002⚙️ Developer UtilitiesFree
Isosceles triangle area calculator
from base and equal sides
H
POST /math/isosceles-triangle-a$0.002⚙️ Developer UtilitiesFree
Isosceles triangle area calculator
area from base and equal sides, free
G
POST /math/isosceles-triangle-area$0.002⚙️ Developer UtilitiesFree
HSL to CMYK converter
hue, saturation, lightness to print percentages
P
POST /color/hsl-cmyk$0.002⚙️ Developer UtilitiesFree
HSL to HWB converter
hue, saturation, lightness to HWB, free
S
POST /color/hsl-hwb$0.002⚙️ Developer UtilitiesFree
Isosceles triangle height calculator
height from base and equal side
H
POST /math/isosceles-triangle-height$0.002⚙️ Developer UtilitiesFree
Isosceles triangle side calculator
equal sides from base and height, free
G
POST /math/isosceles-triangle-side$0.002⚙️ Developer UtilitiesFree
Lagrange error bound calculator
max interpolation error, free
G
POST /math/lagrange-error-bound$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.