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.

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Get your API key Browse the catalog
7825ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesNull space calculatorkernel basis of a matrix from its rowsSsamurai$0.002Open math.null_space →New⚙️ Developer UtilitiesLogical NOR calculatortrue only when both inputs are falsePPavilion$0.002Open math.nor →New⚙️ Developer UtilitiesMultiply complex numbers(a+bi)(c+di) product, freeAabuela$0.002Open math.multiply_complex_numbers →New⚙️ Developer UtilitiesMöbius strip calculatorsurface area and edge lengthSsamurai$0.002Open math.mobius_strip →New⚙️ Developer UtilitiesLong multiplication calculatordigit-by-digit product, freeAabuela$0.002Open math.long_multiplication →New⚙️ Developer UtilitiesMean calculatorarithmetic mean of a list of numbersPPavilion$0.002Open math.mean →New⚙️ Developer UtilitiesLog2 calculatorbase-2 logarithm of a positive numberSsamurai$0.002Open math.log_2 →New⚙️ Developer UtilitiesLine of intersection of two planesparametric formAabuela$0.002Open math.line_of_intersection_of_two_planes →New⚙️ Developer UtilitiesLinear-feedback shift registerLFSR bit sequence from tapsSsamurai$0.002Open math.linear_feedback_shift_register →New⚙️ Developer UtilitiesLinear combination calculatorweighted sum of vectorsPPavilion$0.002Open math.linear_combination →New⚙️ Developer UtilitiesLength of a rectangle calculatorfrom area and width, freeAabuela$0.002Open math.length_of_a_rectangle →New⚙️ Developer UtilitiesLeast to greatest fractionssort a list from smallest to largestPPavilion$0.002Open math.least_to_greatest_fractions →

Popular capabilities

Loved right now, by real traffic.

The full catalog

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

⚙️ Developer UtilitiesFree
Combinations without repetition
C(n,k) n choose k, free
PPavilion
POST /stat/combinations-without-repetition$0.002
⚙️ Developer UtilitiesFree
Confusion matrix calculator
TP, TN, FP, FN from labels
Aabuela
POST /stat/confusion-matrix$0.002
⚙️ Developer UtilitiesFree
Critical value calculator
standard normal z for α
PPavilion
POST /stat/critical-value$0.002
⚙️ Developer UtilitiesFree
D20 dice roller
seeded twenty-sided die, result 1–20, free
Aabuela
POST /stat/d20-dice-roller$0.002
⚙️ Developer UtilitiesFree
Decimal random number generator
seeded min-max decimal, free
PPavilion
POST /stat/decimal-random-number-generator$0.002
⚙️ Developer UtilitiesFree
Dice expected value and variance
fair n-sided die, n rolls
Aabuela
POST /stat/dice$0.002
⚙️ Developer UtilitiesFree
Dispersion calculator
range, variance and standard deviation
PPavilion
POST /stat/dispersion$0.002
⚙️ Developer UtilitiesFree
D&D dice roller
2d6+3 notation, faces and total, free
Aabuela
POST /stat/dnd-dice-roller$0.002
⚙️ Developer UtilitiesFree
Error propagation calculator
combined uncertainty from a formula
PPavilion
POST /stat/error-propagation$0.002
⚙️ Developer UtilitiesFree
False positive rate calculator
FPR from FP and TN
Aabuela
POST /stat/false-positive$0.002
⚙️ Developer UtilitiesFree
Fisher's exact test calculator
2x2 table p-value free
PPavilion
POST /stat/fishers-exact-test$0.002
⚙️ Developer UtilitiesFree
Fractional odds converter
decimal, implied probability, profit
Aabuela
POST /stat/fractional-odds$0.002
⚙️ Developer UtilitiesFree
Histogram calculator
bin ranges and frequencies from data
PPavilion
POST /stat/histogram$0.002
⚙️ Developer UtilitiesFree
Hypergeometric distribution
P(X=k) without replacement
Aabuela
POST /stat/hypergeometric-distribution$0.002
⚙️ Developer UtilitiesFree
IQR calculator
interquartile range as Q3 minus Q1
PPavilion
POST /stat/iqr$0.002
⚙️ Developer UtilitiesFree
Joint probability calculator
P(A and B) from two events
Aabuela
POST /stat/joint-probability$0.002
⚙️ Developer UtilitiesFree
Lottery jackpot probability
balls, draw, matches, and odds
PPavilion
POST /stat/lottery$0.002
⚙️ Developer UtilitiesFree
MAD calculator
mean absolute deviation from a list of numbers
Aabuela
POST /stat/mad$0.002
⚙️ Developer UtilitiesFree
McNemar's test calculator
chi-square and p-value free
PPavilion
POST /stat/mcnemars-test$0.002
⚙️ Developer UtilitiesFree
Median calculator
middle value of a list of numbers
Aabuela
POST /stat/median$0.002
⚙️ Developer UtilitiesFree
MSE calculator
mean squared error of predicted vs actual
Aabuela
POST /stat/mse$0.002
⚙️ Developer UtilitiesFree
Normal approximation calculator
binomial P(X=k) via N(μ,σ)
PPavilion
POST /stat/normal-approximation$0.002
⚙️ Developer UtilitiesFree
Or probability calculator
P(A or B) from three probabilities
PPavilion
POST /stat/or-probability$0.002
⚙️ Developer UtilitiesFree
Order from least to greatest
sort numbers smallest to largest
Aabuela
POST /stat/order-from-least-to-greatest$0.002
⚙️ Developer UtilitiesFree
Password combination calculator
possible passwords from charset size
Aabuela
POST /stat/password-combination$0.002
⚙️ Developer UtilitiesFree
Permutation with repetition
n! / (n1! n2! … nk!), free
PPavilion
POST /stat/permutation-with-repetition$0.002
⚙️ Developer UtilitiesFree
Pie chart percentage calculator
slices that sum to 100
Aabuela
POST /stat/pie-chart-percentage$0.002
⚙️ Developer UtilitiesFree
Post-test probability calculator
disease chance after a test, free
PPavilion
POST /stat/post-test-probability$0.002
⚙️ Developer UtilitiesFree
Probability to fraction converter
reduced numerator/denominator
Aabuela
POST /stat/probability-fraction$0.002
⚙️ Developer UtilitiesFree
Quartic regression calculator
least-squares 4th-degree fit, free
PPavilion
POST /stat/quartic-regression$0.002
⚙️ Developer UtilitiesFree
Random dice roller
N dice of S sides, faces and total, free
Aabuela
POST /stat/random-dice-roller$0.002
⚙️ Developer UtilitiesFree
Relative error calculator
|measured − true| / |true|
Aabuela
POST /stat/relative-error$0.002
⚙️ Developer UtilitiesFree
Sampling distribution of a sample proportion
mean and SD
Aabuela
POST /stat/sampling-distribution-sample-proportion$0.002
⚙️ Developer UtilitiesFree
Skewness calculator
sample G1 coefficient of a numeric list
Aabuela
POST /stat/skewness$0.002
⚙️ Developer UtilitiesFree
Standard error calculator
SE = s/√n from sample SD and n, free
Aabuela
POST /stat/standard-error$0.002
⚙️ Developer UtilitiesFree
Two dice probability
P(sum) for two fair six-sided dice
Aabuela
POST /stat/two-dice-probability$0.002
⚙️ Developer UtilitiesFree
Weibull distribution calculator
PDF and CDF from shape and scale
Aabuela
POST /stat/weibull-distribution$0.002
⚙️ Developer UtilitiesFree
Acres to square miles converter
exact factor, free
Ssamurai
POST /conv/acres-to-square-miles$0.002
⚙️ Developer UtilitiesFree
Angstrom to nm converter
wavelength Å ÷ 10, free
PPavilion
POST /conv/angstrom-to-nm-conversion$0.002
⚙️ Developer UtilitiesFree
Ares to hectares converter
100 ares = 1 ha, free
Aabuela
POST /conv/ares-to-hectares$0.002
⚙️ Developer UtilitiesFree
Astronomical unit converter
AU to km and miles, free
Ssamurai
POST /conv/astronomical-unit$0.002
⚙️ Developer UtilitiesFree
ATM to pascals conversion
exact 101325 Pa factor, free
PPavilion
POST /conv/atm-to-pascals-conversion$0.002
⚙️ Developer UtilitiesFree
Bar to psig converter
gauge pressure, free in browser
Aabuela
POST /conv/bar-to-psig-conversion$0.002
⚙️ Developer UtilitiesFree
Billion to trillion converter
divide by 1,000
Ssamurai
POST /conv/billion-to-trillion-converter$0.002
⚙️ Developer UtilitiesFree
Binary converter
decimal integer ↔ base-2 string, free
PPavilion
POST /conv/binary$0.002
⚙️ Developer UtilitiesFree
Binary to octal converter
base-2 string to base-8, free
Aabuela
POST /conv/binary-to-octal$0.002
⚙️ Developer UtilitiesFree
Byte converter
convert bytes, KB, MB, GB, TB free
Ssamurai
POST /conv/byte-converter$0.002
⚙️ Developer UtilitiesFree
CC to grams converter
volume × density, free
Aabuela
POST /conv/cc-to-grams-converter$0.002
⚙️ Developer UtilitiesFree
CC to ml converter
1 cc equals 1 ml exactly, free
Ssamurai
POST /conv/cc-to-ml-converter$0.002
⚙️ Developer UtilitiesFree
CC to oz converter
cubic centimeters to US fluid ounces
PPavilion
POST /conv/cc-to-oz-converter$0.002
⚙️ Developer UtilitiesFree
CCF to therms converter
natural gas volume to energy, free
PPavilion
POST /conv/ccf-to-therms$0.002
⚙️ Developer UtilitiesFree
Centigrade to Celsius converter
identical scale, free
Aabuela
POST /conv/centigrade-to-celsius$0.002
⚙️ Developer UtilitiesFree
Centimeter converter
cm, inches, feet, meters, mm, free
Ssamurai
POST /conv/centimeter$0.002
⚙️ Developer UtilitiesFree
Cents to euros converter
divide euro cents by 100, free
PPavilion
POST /conv/cents-to-euros$0.002
⚙️ Developer UtilitiesFree
CGS system of units converter
SI to cm, g, s, free
Ssamurai
POST /conv/cgs-system-of-units$0.002
⚙️ Developer UtilitiesFree
CM height conversion
centimeters to feet and inches, free
Aabuela
POST /conv/cm-height-conversion$0.002
⚙️ Developer UtilitiesFree
CM to in converter
centimeters to inches, exact 2.54
PPavilion
POST /conv/cm-to-in$0.002
⚙️ Developer UtilitiesFree
CM to km converter
exact 100000 factor, free
Ssamurai
POST /conv/cm-to-km-conversion$0.002
⚙️ Developer UtilitiesFree
CM to mm conversion
centimeters to millimeters, free
Aabuela
POST /conv/cm-to-mm-conversion$0.002
⚙️ Developer UtilitiesFree
Conversion calculator
same-kind units with fixed factors, free
PPavilion
POST /conv/conversion-calculator$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.

Pay-as-you-go
Per task
$0.002+

The full API — 7800+ 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.

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