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
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Get your API key Browse the catalog
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_density →New⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulation →New⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_number →New⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocity →New⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficient →New⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rate →New⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strain →New⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmission →New⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffness →New⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_spring →New⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertia →New⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation →

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
Square color scheme generator
four balanced colors from one hex
Kkatherine
POST /color/square-scheme$0.002
⚙️ Developer UtilitiesFree
Generate color tints
create an even palette toward white
Ffrances
POST /color/tints-palette$0.002
⚙️ Developer UtilitiesFree
APCA contrast calculator
Lc between text and background
Aabuela
POST /color/apca-contrast$0.002
⚙️ Developer UtilitiesFree
W3C brightness difference calculator
test two colors
Kkatherine
POST /color/brightness-diff-w3c$0.002
⚙️ Developer UtilitiesFree
CIE94 color difference calculator
Delta E 1994
Ffrances
POST /color/delta-e-94$0.002
⚙️ Developer UtilitiesFree
Evenly spaced hue palette
N colors around the wheel, free
Ssamurai
POST /color/hue-wheel$0.002
⚙️ Developer UtilitiesFree
Relative luminance calculator
WCAG sRGB formula, free
Ffrances
POST /color/relative-luminance$0.002
⚙️ Developer UtilitiesFree
Simulate protanomaly color
reduced red sensitivity filter for hex/RGB
Ssamurai
POST /color/sim-protanomaly$0.002
⚙️ Developer UtilitiesFree
Protanopia color simulator
Brettel-Vienot matrix
Bbarbara
POST /color/sim-protanopia$0.002
⚙️ Developer UtilitiesFree
Warm and cool color variant palette generator
Kkatherine
POST /color/temperature-palette$0.002
⚙️ Developer UtilitiesFree
Contrast ratio letter grade
WCAG pair scored A to fail
Aabuela
POST /color/contrast-grade$0.002
⚙️ Developer UtilitiesFree
Gradient color stops generator
evenly space colors
Bbarbara
POST /color/gradient-stops$0.002
⚙️ Developer UtilitiesFree
Hex alpha to opacity percent
convert #RRGGBBAA transparency
Bbarbara
POST /color/hex-alpha-to-opacity$0.002
⚙️ Developer UtilitiesFree
HSL to CSS string formatter
create a valid hsl() color
Kkatherine
POST /color/hsl-to-css$0.002
⚙️ Developer UtilitiesFree
Interpolate two colors in HSL
shortest hue path blender
Ffrances
POST /color/interpolate-hsl$0.002
⚙️ Developer UtilitiesFree
OKLCH to CSS string
format valid oklch() colors, free
Ssamurai
POST /color/oklch-to-css$0.002
⚙️ Developer UtilitiesFree
Color swatch SVG generator
inline hex rectangle markup, free
Aabuela
POST /color/swatch-svg$0.002
⚙️ Developer UtilitiesFree
Cubic-bezier color interpolation
eased RGB color at any fraction
Ffrances
POST /color/bezier-interpolate$0.002
⚙️ Developer UtilitiesFree
Rich black recipe generator
CMYK under full black for press
Ssamurai
POST /color/black-generation$0.002
⚙️ Developer UtilitiesFree
Halftone tint to gray calculator
include dot gain
Ffrances
POST /color/halftone-gray$0.002
⚙️ Developer UtilitiesFree
Hex to CMYK ink percentages
#RRGGBB to print channels, free
Ssamurai
POST /color/hex-to-ink-channels$0.002
⚙️ Developer UtilitiesFree
Quantize a color to the nearest palette entry
Bbarbara
POST /color/quantize-to-palette$0.002
⚙️ Developer UtilitiesFree
Quantile color scale buckets
map numbers to colors
Kkatherine
POST /color/scale-buckets$0.002
⚙️ Developer UtilitiesFree
Spot to process approximation
CMYK recipe from RGB with Delta E
Aabuela
POST /color/spot-to-process$0.002
⚙️ Developer UtilitiesFree
Under-color removal calculator for CMYK ink reduction
Bbarbara
POST /color/ucr$0.002
⚙️ Developer UtilitiesFree
Color and complement distance
perceptual harmony strength
Ffrances
POST /color/complement-distance$0.002
⚙️ Developer UtilitiesFree
Is color light or dark
perceived brightness for overlay text, free
Aabuela
POST /color/is-light-or-dark$0.002
⚙️ Developer UtilitiesFree
Validate hex color
check 3, 4, 6, or 8 digit codes
Bbarbara
POST /color/is-valid-hex$0.002
⚙️ Developer UtilitiesFree
Lightest color in a list
WCAG relative luminance, free
Ssamurai
POST /color/lightest-in-list$0.002
⚙️ Developer UtilitiesFree
Sort colors by luminance
darkest to lightest hex palette
Kkatherine
POST /color/sort-by-luminance$0.002
⚙️ Developer UtilitiesFree
Warm or cool color checker by hue angle
Ffrances
POST /color/warm-or-cool$0.002
⚙️ Developer UtilitiesFree
HWB to CMYK converter
print ink percentages free online
Aabuela
POST /color/hwb-cmyk$0.002
⚙️ Developer UtilitiesFree
Color palette contrast matrix
audit every WCAG color pair
Kkatherine
POST /color/palette-contrast-matrix$0.002
⚙️ Developer UtilitiesFree
Caster sugar cups to grams converter
superfine sugar by density, free
Ssamurai
POST /cook/caster-sugar-cups-to-grams$0.002
⚙️ Developer UtilitiesFree
Chocolate chips cups to grams converter
Bbarbara
POST /cook/chocolate-chips-cups-to-grams$0.002
⚙️ Developer UtilitiesFree
Maple syrup cups to grams converter
fixed kitchen conversion
Kkatherine
POST /cook/maple-syrup-cups-to-grams$0.002
⚙️ Developer UtilitiesFree
Whole Milk Cups to Grams Converter
Ffrances
POST /cook/whole-milk-cups-to-grams$0.002
⚙️ Developer UtilitiesFree
Whole wheat flour cups to grams converter
Bbarbara
POST /cook/whole-wheat-flour-cups-to-grams$0.002
⚙️ Developer UtilitiesFree
Brown sugar grams to cups converter
packed brown sugar by density, free
Ssamurai
POST /cook/brown-sugar-grams-to-cups$0.002
⚙️ Developer UtilitiesFree
Cake flour grams to cups converter
quick US cup conversion
Ffrances
POST /cook/cake-flour-grams-to-cups$0.002
⚙️ Developer UtilitiesFree
Greek yogurt cups to grams converter
fixed density, free
Aabuela
POST /cook/greek-yogurt-cups-to-grams$0.002
⚙️ Developer UtilitiesFree
Honey tablespoons to grams converter
quick fixed conversion
Bbarbara
POST /cook/honey-tbsp-to-grams$0.002
⚙️ Developer UtilitiesFree
Salt teaspoons to grams converter
fixed 6 g per tsp
Kkatherine
POST /cook/salt-tsp-to-grams$0.002
⚙️ Developer UtilitiesFree
Vanilla extract teaspoons to grams converter
fixed tsp mass, free
Ssamurai
POST /cook/vanilla-extract-tsp-to-grams$0.002
⚙️ Developer UtilitiesFree
Bundt pan volume estimator
calculate batter capacity
Kkatherine
POST /cook/bundt-pan-volume$0.002
⚙️ Developer UtilitiesFree
Butter sticks to grams converter
quick US butter conversion
Ffrances
POST /cook/butter-sticks-to-grams$0.002
⚙️ Developer UtilitiesFree
Celsius to Gas Mark Converter
British Oven Settings
Bbarbara
POST /cook/celsius-to-gas-mark$0.002
⚙️ Developer UtilitiesFree
Round cake pan area calculator
base area from diameter, free
Ssamurai
POST /cook/round-pan-area$0.002
⚙️ Developer UtilitiesFree
Square to round pan size converter
match batter capacity by area
Ffrances
POST /cook/square-to-round-pan$0.002
⚙️ Developer UtilitiesFree
Tablespoons to fluid ounces converter
exact US factor, free
Aabuela
POST /cook/tbsp-to-fl-oz$0.002
⚙️ Developer UtilitiesFree
High-altitude liquid adjuster for baking
fixed formula
Kkatherine
POST /cook/altitude-liquid$0.002
⚙️ Developer UtilitiesFree
High-Altitude Oven Temperature Adjuster
Ffrances
POST /cook/altitude-temp-adjust$0.002
⚙️ Developer UtilitiesFree
Cake batter depth calculator
volume ÷ pan base area
Aabuela
POST /cook/batter-depth$0.002
⚙️ Developer UtilitiesFree
Double a recipe calculator
double ingredient quantity for a larger batch
Ssamurai
POST /cook/recipe-double$0.002
⚙️ Developer UtilitiesFree
Tube pan volume calculator
batter capacity from pan dimensions
Bbarbara
POST /cook/tube-pan-volume$0.002
⚙️ Developer UtilitiesFree
Active dry to instant yeast converter
fixed 0.75 factor, free
Ssamurai
POST /cook/active-to-instant-yeast$0.002
⚙️ Developer UtilitiesFree
Baker's percentage to weight calculator
flour % to grams
Aabuela
POST /cook/bakers-pct-to-weight$0.002
⚙️ Developer UtilitiesFree
Dough weight per piece calculator for rolls and loaves
Bbarbara
POST /cook/dough-per-piece$0.002
⚙️ Developer UtilitiesFree
Scale recipe from ingredient on hand
free calculator
PPavilion
POST /cook/leftover-scale$0.002
⚙️ Developer UtilitiesFree
Sourdough levain build calculator
flour and water amounts
Ffrances
POST /cook/levain-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 — 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.

Recharge balance