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
Euler Method ODE Solver Calculator
Step-by-Step Table
F
POST /calculus/euler-method-step$0.002⚙️ Developer UtilitiesFree
P-series convergence checker
test whether a series converges
K
POST /calculus/p-series-convergence$0.002⚙️ Developer UtilitiesFree
Series Partial Sum Calculator
Add the First n Terms
F
POST /calculus/partial-sum-series$0.002⚙️ Developer UtilitiesFree
Sum of the first n cubes calculator
1³+…+n³ = (n(n+1)/2)²
S
POST /calculus/sum-of-cubes-formula$0.002⚙️ Developer UtilitiesFree
Damped oscillator position calculator
x(t)=A e^{-βt} cos(ωt+φ)
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POST /calculus/damped-oscillator-position$0.002⚙️ Developer UtilitiesFree
ODE half-life from decay constant calculator
ln(2) / lambda
B
POST /calculus/half-life-from-decay-constant$0.002⚙️ Developer UtilitiesFree
Runge-Kutta 4 single-step calculator
compute RK4 slopes
K
POST /calculus/rk4-single-step$0.002⚙️ Developer UtilitiesFree
Separable Differential Equation Solver Calculator
F
POST /calculus/separable-ode$0.002⚙️ Developer UtilitiesFree
Series sum by partial fractions
telescoping closed form calculator
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POST /calculus/series-sum-by-partial-fractions$0.002⚙️ Developer UtilitiesFree
Euler Method for a 2D System Calculator
Show Every Step
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POST /calculus/euler-method-system-2d$0.002⚙️ Developer UtilitiesFree
Fixed-point iteration single-step calculator
apply g once to x_n
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POST /calculus/fixed-point-single-step$0.002⚙️ Developer UtilitiesFree
Mixing tank concentration calculator
first-order ODE C(t), free
A
POST /calculus/mixing-tank-concentration$0.002⚙️ Developer UtilitiesFree
Taylor Series Method ODE Calculator
B
POST /calculus/taylor-method-ode$0.002⚙️ Developer UtilitiesFree
Natural cubic spline interpolation calculator
evaluate S(x) at a target
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POST /calculus/cubic-spline-natural$0.002⚙️ Developer UtilitiesFree
Inverse interpolation calculator
estimate x from target y, free
A
POST /calculus/inverse-interpolation$0.002⚙️ Developer UtilitiesFree
Least squares residuals calculator
residuals and residual sum of squares
F
POST /calculus/least-squares-residuals$0.002⚙️ Developer UtilitiesFree
Least-squares regression prediction calculator
K
POST /calculus/linear-regression-predict$0.002⚙️ Developer UtilitiesFree
Newton Backward Difference Interpolation Calculator
B
POST /calculus/newton-backward-interpolation$0.002⚙️ Developer UtilitiesFree
Newton-Raphson Single Step Calculator
F
POST /calculus/newton-raphson-single-step$0.002⚙️ Developer UtilitiesFree
Steffensen method root finder calculator
quadratic convergence
K
POST /calculus/steffensen-method$0.002⚙️ Developer UtilitiesFree
Double Integral Midpoint Rule Calculator
F
POST /calculus/double-integral-midpoint$0.002⚙️ Developer UtilitiesFree
Gradient magnitude calculator
||∇f|| from ∂f/∂x and ∂f/∂y
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POST /calculus/gradient-magnitude$0.002⚙️ Developer UtilitiesFree
Hessian determinant calculator
apply the second derivative test
K
POST /calculus/hessian-determinant$0.002⚙️ Developer UtilitiesFree
Normal line to surface calculator
parametric line from gradient, free
A
POST /calculus/normal-line-surface$0.002⚙️ Developer UtilitiesFree
Numerical Partial Derivative with Respect to x Calculator
B
POST /calculus/partial-derivative-x-numeric$0.002⚙️ Developer UtilitiesFree
RGB to XYZ converter
sRGB to CIE 1931 XYZ (D65), free
B
POST /color/rgb-xyz$0.002⚙️ Developer UtilitiesFree
LAB to RGB converter
CIE L*a*b* to sRGB channels (D65), free
S
POST /color/lab-rgb$0.002⚙️ Developer UtilitiesFree
RGB to LCH converter
sRGB channels to CIE L*C*h° (D65), free
A
POST /color/rgb-lch$0.002⚙️ Developer UtilitiesFree
RGB to OKLCH converter
perceptual lightness, chroma and hue
F
POST /color/rgb-oklch$0.002⚙️ Developer UtilitiesFree
RGB to YUV converter
BT.601 luminance and chrominance, free
K
POST /color/rgb-yuv$0.002⚙️ Developer UtilitiesFree
YIQ to RGB converter
convert NTSC luminance and chrominance
B
POST /color/yiq-rgb$0.002⚙️ Developer UtilitiesFree
CMYK to HSV converter
print ink to hue and value
B
POST /color/cmyk-hsv$0.002⚙️ Developer UtilitiesFree
HSV to HSL converter
hue, saturation, value to lightness free
A
POST /color/hsv-hsl$0.002⚙️ Developer UtilitiesFree
HWB to HSL converter
hue, saturation and lightness
K
POST /color/hwb-hsl$0.002⚙️ Developer UtilitiesFree
RGB to LUV converter
sRGB channels to CIE L*u*v* (D65), free
S
POST /color/rgb-luv$0.002⚙️ Developer UtilitiesFree
XYZ to xyY converter
CIE chromaticity and luminance
F
POST /color/xyz-xyy$0.002⚙️ Developer UtilitiesFree
Expand shorthand hex color
#RGB to #RRGGBB free
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POST /color/hex3-hex6$0.002⚙️ Developer UtilitiesFree
Hex8 to RGBA converter
parse #RRGGBBAA color channels
B
POST /color/hex8-rgba$0.002⚙️ Developer UtilitiesFree
Hex to CMYK converter
#RRGGBB to cyan magenta yellow key, free
S
POST /color/hex-cmyk$0.002⚙️ Developer UtilitiesFree
LAB to hex converter
CIE L*a*b* to sRGB hex, free
F
POST /color/lab-hex$0.002⚙️ Developer UtilitiesFree
OKLCH to hex converter
accurate sRGB color conversion
K
POST /color/oklch-hex$0.002⚙️ Developer UtilitiesFree
RGB555 to RGB Unpacker
Convert 15-Bit Color to 8-Bit Channels
K
POST /color/rgb555-rgb$0.002⚙️ Developer UtilitiesFree
XYZ to hex converter
CIE XYZ tristimulus to #RRGGBB sRGB, free
A
POST /color/xyz-hex$0.002⚙️ Developer UtilitiesFree
Darken hex color by percent
HSL lightness, free online
S
POST /color/darken-percent$0.002⚙️ Developer UtilitiesFree
Dim a color by reducing HSV value
deterministic color tool
K
POST /color/dim-hsv$0.002⚙️ Developer UtilitiesFree
Apply gamma correction to a color
RGB power curve, free
S
POST /color/gamma$0.002⚙️ Developer UtilitiesFree
Hex to grayscale by Rec. 709 luminance
B
POST /color/grayscale-luminance$0.002⚙️ Developer UtilitiesFree
Blend two colors by ratio
weighted RGB color calculator
F
POST /color/mix-ratio$0.002⚙️ Developer UtilitiesFree
RGB565 to RGB unpacker
convert 16-bit color to 8-bit RGB
F
POST /color/rgb565-rgb$0.002⚙️ Developer UtilitiesFree
RGB to color temperature
estimate Kelvin CCT from sRGB, free
A
POST /color/rgb-kelvin$0.002⚙️ Developer UtilitiesFree
Clamp color to gamut
fix RGB values to the 0–255 range
B
POST /color/clamp-gamut$0.002⚙️ Developer UtilitiesFree
Color Burn Blend Two Colors
Hex and RGB Result
F
POST /color/color-burn$0.002⚙️ Developer UtilitiesFree
Hex to grayscale by lightness
HSL (max+min)/2 gray hex, free
A
POST /color/grayscale-lightness$0.002⚙️ Developer UtilitiesFree
Subtractive color mixer
blend two colours like paint (RYB), free
S
POST /color/mix-subtractive$0.002⚙️ Developer UtilitiesFree
Overlay blend two colors
deterministic hex calculator
K
POST /color/overlay$0.002⚙️ Developer UtilitiesFree
Shift color temperature warmer or cooler
hex color tool
F
POST /color/temperature-shift$0.002⚙️ Developer UtilitiesFree
Unpremultiply RGBA Alpha
Recover Straight Color Channels
K
POST /color/unpremultiply$0.002⚙️ Developer UtilitiesFree
Darken blend two colors
min RGB channels, free
A
POST /color/darken-only$0.002⚙️ Developer UtilitiesFree
Exclusion blend two colors
calculate the resulting hex color
B
POST /color/exclusion$0.002⚙️ Developer UtilitiesFree
Pin light blend
combine two colors (darken or lighten by top)
S
POST /color/pin-light$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.