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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7554ready-made tools
6channels
1API & key
$0.002per call, from
The full catalog
Search or filter by category. Every capability is its own endpoint with a published price.
⚙️ Developer UtilitiesFree
Quadratic maximum-minimum calculator
vertex of ax²+bx+c, free
P
POST /algebra/quadratic-max-min$0.002⚙️ Developer UtilitiesFree
Quartic equation from roots calculator
expand four factors
B
POST /algebra/quartic-from-roots$0.002⚙️ Developer UtilitiesFree
Height of a cylinder calculator
from volume and base radius
G
POST /math/height-of-cylinder$0.002⚙️ Developer UtilitiesFree
Heptagon calculator
interior angles, perimeter and area
H
POST /math/heptagon$0.002⚙️ Developer UtilitiesFree
Compound inequality solver
AND/OR to interval notation, free
A
POST /algebra/compound-inequality$0.002⚙️ Developer UtilitiesFree
Factor trinomial calculator
factor ax² + bx + c over integers
K
POST /algebra/factor-trinomial$0.002⚙️ Developer UtilitiesFree
Vertical shift of a function calculator
move a graph up or down
B
POST /algebra/function-vertical-shift$0.002⚙️ Developer UtilitiesFree
Polynomial LCM calculator
least common multiple using GCD
B
POST /algebra/polynomial-lcm$0.002⚙️ Developer UtilitiesFree
Simplify rational expression calculator
factor, cancel, excluded values
S
POST /algebra/rational-expression-simplify$0.002⚙️ Developer UtilitiesFree
Rational function x-intercepts calculator
zeros of N in domain
S
POST /algebra/rational-function-x-intercepts$0.002⚙️ Developer UtilitiesFree
System of linear inequalities calculator
boundaries and corner points
P
POST /algebra/system-of-inequalities$0.002⚙️ Developer UtilitiesFree
Hexagonal pyramid surface area
from base side and slant height, free
H
POST /math/hexagonal-pyramid-surface-area$0.002⚙️ Developer UtilitiesFree
Hilbert's hotel paradox
shift every guest and free rooms for new arrivals
H
POST /math/hilberts-hotel-paradox$0.002⚙️ Developer UtilitiesFree
Complex Reciprocal Calculator
Find 1/z
B
POST /algebra/complex-reciprocal$0.002⚙️ Developer UtilitiesFree
Complex to polar form calculator
find modulus and argument
K
POST /algebra/complex-to-polar$0.002⚙️ Developer UtilitiesFree
Exponential growth calculator
future value and growth factor
B
POST /algebra/exponential-growth$0.002⚙️ Developer UtilitiesFree
Exponential equation same-base solver
rewrite bases, equate exponents
S
POST /algebra/exponential-same-base$0.002⚙️ Developer UtilitiesFree
Function zeros calculator
real roots of f(x) = 0, free
A
POST /algebra/function-zeros$0.002⚙️ Developer UtilitiesFree
Hyperbolic functions calculator
sinh, cosh and tanh online
G
POST /math/hyperbolic-functions$0.002⚙️ Developer UtilitiesFree
Imaginary unit powers
compute i raised to any integer exponent
H
POST /math/imaginary-number$0.002⚙️ Developer UtilitiesFree
Improper fraction to mixed number converter
whole part and remainder
G
POST /math/improper-fraction-to-mixed-number$0.002⚙️ Developer UtilitiesFree
Inscribed angle calculator
angle from intercepted arc, free online
H
POST /math/inscribed-angle$0.002⚙️ Developer UtilitiesFree
Common Difference Calculator
Check an Arithmetic Sequence
B
POST /algebra/arithmetic-common-difference$0.002⚙️ Developer UtilitiesFree
Arithmetic mean calculator
average of a list of numbers, free
A
POST /algebra/arithmetic-mean$0.002⚙️ Developer UtilitiesFree
Distance between complex numbers calculator
|z₁−z₂| in the plane
S
POST /algebra/complex-distance$0.002⚙️ Developer UtilitiesFree
Complex number from modulus and argument calculator
rectangular form
K
POST /algebra/complex-from-modulus-argument$0.002⚙️ Developer UtilitiesFree
Exponential function from two points
y = a·b^x, free
A
POST /algebra/exponential-model-from-two-points$0.002⚙️ Developer UtilitiesFree
Matrix scalar multiplication calculator
scale every entry
B
POST /algebra/matrix-scalar-multiply$0.002⚙️ Developer UtilitiesFree
Sequence Term from Explicit Formula Calculator
K
POST /algebra/sequence-term-from-formula$0.002⚙️ Developer UtilitiesFree
Sum of first n even numbers calculator
S = n(n+1)
S
POST /algebra/sum-of-even-numbers$0.002⚙️ Developer UtilitiesFree
Integer checker
test whether a value is a whole number
G
POST /math/integer$0.002⚙️ Developer UtilitiesFree
Integration by completing the square
arctangent antiderivative, free
H
POST /math/integration-by-completing-the-square$0.002⚙️ Developer UtilitiesFree
Binomial expansion specific term calculator
coefficient and powers
B
POST /algebra/binomial-specific-term$0.002⚙️ Developer UtilitiesFree
Identity matrix generator
I_n with ones on the diagonal, free
A
POST /algebra/identity-matrix$0.002⚙️ Developer UtilitiesFree
2×2 matrix inverse calculator
adjugate over det, free
S
POST /algebra/matrix-inverse-2x2$0.002⚙️ Developer UtilitiesFree
Row echelon form calculator
forward Gaussian elimination
K
POST /algebra/matrix-row-echelon$0.002⚙️ Developer UtilitiesFree
Interior and exterior triangle angles calculator
from two known angles
G
POST /math/interior-and-exterior-triangle-angles$0.002⚙️ Developer UtilitiesFree
Interval notation converter
bounds and inclusivity to interval form
H
POST /math/interval-notation$0.002⚙️ Developer UtilitiesFree
Absolute value equation two solutions calculator
|ax+b|=c both roots
S
POST /algebra/absolute-value-two-solutions$0.002⚙️ Developer UtilitiesFree
Compound rule of three calculator
mixed direct and inverse
A
POST /algebra/compound-rule-of-three$0.002⚙️ Developer UtilitiesFree
Collinear points checker
three points on one line, shared slope
A
POST /algebra/collinear-points-check$0.002⚙️ Developer UtilitiesFree
Linear combination of two numbers
find x, y for ax + by = c
S
POST /algebra/linear-combination$0.002⚙️ Developer UtilitiesFree
Nested absolute value equation solver
solve ||ax+b|+c|=d for x
S
POST /algebra/solve-absolute-value-equation-nested$0.002⚙️ Developer UtilitiesFree
Circular orbit speed calculator
v = √(μ/r) from μ and radius
S
POST /astro/circular-orbit-speed$0.002⚙️ Developer UtilitiesFree
Orbital radius from vis-viva calculator
solve r from v, a, μ
S
POST /astro/vis-viva-radius$0.002⚙️ Developer UtilitiesFree
Semi-major axis from apsides
a = (ra + rp) / 2
S
POST /astro/semimajor-from-apsides$0.002⚙️ Developer UtilitiesFree
Orbital mean motion calculator
n = √(μ/a³) from μ and a
S
POST /astro/mean-motion$0.002⚙️ Developer UtilitiesFree
Semi-major axis from period calculator
a from T and μ (Kepler)
S
POST /astro/sma-from-period$0.002⚙️ Developer UtilitiesFree
Orbital period with both masses
Kepler T from m1, m2 and a
S
POST /astro/kepler-two-masses$0.002⚙️ Developer UtilitiesFree
Characteristic energy C3 calculator
C3 = v∞² launch energy
S
POST /astro/characteristic-energy-c3$0.002⚙️ Developer UtilitiesFree
Radial/transverse orbital velocity
v_r and v_⊥ from e, ν, h
S
POST /astro/orbital-velocity-vector$0.002⚙️ Developer UtilitiesFree
Hohmann second burn Δv calculator
circularize at the outer orbit
S
POST /astro/hohmann-deltav2$0.002⚙️ Developer UtilitiesFree
Launch window phase angle calculator for Hohmann transfers
B
POST /astro/launch-window-phase-angle$0.002⚙️ Developer UtilitiesFree
Magnitude Difference to Brightness Ratio Calculator
B
POST /astro/magnitude-diff-to-ratio$0.002⚙️ Developer UtilitiesFree
Two-body reduced mass calculator
calculate reduced mass in kilograms
B
POST /astro/reduced-mass$0.002⚙️ Developer UtilitiesFree
Rigid body Roche limit calculator
radius and density ratio
K
POST /astro/roche-limit-rigid$0.002⚙️ Developer UtilitiesFree
Total magnitude of equal stars calculator
combine stellar brightness
K
POST /astro/cluster-total-magnitude$0.002⚙️ Developer UtilitiesFree
Radial Velocity from Doppler Shift Calculator
K
POST /astro/radial-velocity-doppler$0.002⚙️ Developer UtilitiesFree
White dwarf radius from mass calculator
Nauenberg relation
K
POST /astro/white-dwarf-radius$0.002⚙️ Developer UtilitiesFree
Wien peak wavelength calculator
blackbody temperature to metres
B
POST /astro/wien-peak-wavelength$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.