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

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_densityNew⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulationNew⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_numberNew⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocityNew⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficientNew⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rateNew⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strainNew⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmissionNew⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffnessNew⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_springNew⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertiaNew⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation

The full catalog

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

⚙️ Developer UtilitiesFree
Raoult's law two-component calculator
P = x₁P₁° + x₂P₂° free
AAspire
POST /chem/raoult-two-component$0.002
⚙️ Developer UtilitiesFree
Rate constant at new temperature calculator
Arrhenius k2, free
PPavilion
POST /chem/rate-constant-new-temperature$0.002
⚙️ Developer UtilitiesFree
Rate from stoichiometry calculator
reaction rate from species rate and coefficient, free
Aabuela
POST /chem/rate-from-stoichiometry$0.002
⚙️ Developer UtilitiesFree
Rate law calculator
reaction rate from k and concentrations, free
Aabuela
POST /chem/rate-law$0.002
⚙️ Developer UtilitiesFree
Reactant mass needed calculator
grams for a target product, free
Aabuela
POST /chem/reactant-mass-for-product$0.002
⚙️ Developer UtilitiesFree
Reaction quotient Q calculator
Qc from concentrations and coefficients, free
PPavilion
POST /chem/reaction-quotient$0.002
⚙️ Developer UtilitiesFree
Reaction rate calculator
average rate from Δconcentration and time, free
PPavilion
POST /chem/reaction-rate$0.002
⚙️ Developer UtilitiesFree
Reduced properties calculator
Pr, Tr, Vr from critical constants
PPavilion
POST /chem/reduced-state-variables$0.002
⚙️ Developer UtilitiesFree
Relative vapor pressure lowering calculator
ΔP/P° free
AAspire
POST /chem/relative-vapor-lowering$0.002
⚙️ Developer UtilitiesFree
Reverse osmosis net driving pressure
applied P minus feed osmotic π
PPavilion
POST /chem/reverse-osmosis-pressure$0.002
⚙️ Developer UtilitiesFree
Root-mean-square speed calculator
v_rms from molar mass and T, free
PPavilion
POST /chem/rms-speed$0.002
⚙️ Developer UtilitiesFree
Second-order concentration calculator
remaining [A] from k, A₀, t, free
Aabuela
POST /chem/second-order-concentration$0.002
⚙️ Developer UtilitiesFree
Second-order half-life calculator
t½ = 1/(k·[A]₀), free
PPavilion
POST /chem/second-order-half-life$0.002
⚙️ Developer UtilitiesFree
Serial dilution calculator
concentration at each step free
AAspire
POST /chem/serial-dilution$0.002
⚙️ Developer UtilitiesFree
First-order shelf-life calculator
t90 for 10% decomposition, free
PPavilion
POST /chem/shelf-life-first-order$0.002
⚙️ Developer UtilitiesFree
Solution density from mass percent
ideal mixture estimate, free
Aabuela
POST /chem/solution-density-from-percent$0.002
⚙️ Developer UtilitiesFree
Solution freezing point calculator
Tf from solvent, molality, Kf and van't Hoff
PPavilion
POST /chem/solution-freezing-point$0.002
⚙️ Developer UtilitiesFree
Standard cell potential calculator
E° from cathode & anode, free
Aabuela
POST /chem/standard-cell-potential$0.002
⚙️ Developer UtilitiesFree
Stoichiometric air-fuel ratio calculator
AFR from C and H, free
AAspire
POST /chem/stoichiometric-air-fuel-ratio$0.002
⚙️ Developer UtilitiesFree
Mole ratio calculator
product moles from stoichiometric coefficients free
AAspire
POST /chem/stoichiometry-mole-ratio$0.002
⚙️ Developer UtilitiesFree
Theoretical yield calculator
moles × stoichiometric ratio, free
Aabuela
POST /chem/theoretical-yield$0.002
⚙️ Developer UtilitiesFree
Titration equivalence point volume calculator
Veq from C and V
Aabuela
POST /chem/titration-equivalence-volume$0.002
⚙️ Developer UtilitiesFree
Titration pH at equivalence calculator
salt C and Kb, free
PPavilion
POST /chem/titration-ph-at-equivalence$0.002
⚙️ Developer UtilitiesFree
Van der Waals molar volume calculator
real gas Vm from P, T, a, b
PPavilion
POST /chem/van-der-waals-volume$0.002
⚙️ Developer UtilitiesFree
Van't Hoff factor calculator
i from ions and dissociation, free
Aabuela
POST /chem/vant-hoff-factor$0.002
⚙️ Developer UtilitiesFree
Vapor phase composition calculator
Raoult y_i from x_i and P_i^sat, free
Aabuela
POST /chem/vapor-phase-composition$0.002
⚙️ Developer UtilitiesFree
Vapor pressure lowering calculator
ΔP = x·P° from mole fraction and pure solvent pressure
PPavilion
POST /chem/vapor-pressure-lowering$0.002
⚙️ Developer UtilitiesFree
Volume for target molarity calculator
V = n/M from moles, free
PPavilion
POST /chem/volume-for-target-molarity$0.002
⚙️ Developer UtilitiesFree
Volume percent to molarity calculator
M from % v/v free
AAspire
POST /chem/volume-percent-to-molarity$0.002
⚙️ Developer UtilitiesFree
Gas volume to moles calculator
convert STP gas volume to moles free
AAspire
POST /chem/volume-to-moles-gas$0.002
⚙️ Developer UtilitiesFree
Weight/volume percent calculator
% w/v from grams and mL, free
Aabuela
POST /chem/weight-volume-percent$0.002
⚙️ Developer UtilitiesFree
Weight-volume % to molarity calculator
% w/v to M, free
PPavilion
POST /chem/weight-volume-to-molarity$0.002
⚙️ Developer UtilitiesFree
Precipitation ion product calculator
Q vs Ksp, free
Aabuela
POST /chem/will-precipitate$0.002
⚙️ Developer UtilitiesFree
Analogous color generator
two neighbors by hue shift angle, free palette
AAspire
POST /color/analogous$0.002
⚙️ Developer UtilitiesFree
CMYK to RGB converter
cyan magenta yellow key free
Aabuela
POST /color/cmyk-rgb$0.002
⚙️ Developer UtilitiesFree
Complementary color finder
opposite hue on the wheel, free
Aabuela
POST /color/complementary$0.002
⚙️ Developer UtilitiesFree
Color to grayscale converter
luminosity hex & gray value, free
PPavilion
POST /color/grayscale$0.002
⚙️ Developer UtilitiesFree
Hex to HSL converter
hue, saturation, lightness free
Aabuela
POST /color/hex-hsl$0.002
⚙️ Developer UtilitiesFree
Hex to color name
nearest CSS named color for any hex code, free
AAspire
POST /color/hex-name$0.002
⚙️ Developer UtilitiesFree
Hex to RGB converter
#RRGGBB to red, green, blue, free
PPavilion
POST /color/hex-rgb$0.002
⚙️ Developer UtilitiesFree
HSL to HSV converter
convert hue saturation lightness and value both ways, free
AAspire
POST /color/hsl-hsv$0.002
⚙️ Developer UtilitiesFree
HSL to RGB converter
hue, saturation, lightness to red green blue 0–255, free
AAspire
POST /color/hsl-rgb$0.002
⚙️ Developer UtilitiesFree
HSV to RGB converter
hue, saturation, value to red, green, blue, free
PPavilion
POST /color/hsv-rgb$0.002
⚙️ Developer UtilitiesFree
Color lightener
lighten a hex color by percentage, free HSL tool
AAspire
POST /color/lighten$0.002
⚙️ Developer UtilitiesFree
Color mixer
blend two hex colours by ratio, free
Aabuela
POST /color/mix$0.002
⚙️ Developer UtilitiesFree
CSS color name to hex
tomato, navy, rebeccapurple to #RRGGBB, free
PPavilion
POST /color/name-hex$0.002
⚙️ Developer UtilitiesFree
RGB to HSL converter
hue, saturation, lightness free
Aabuela
POST /color/rgb-hsl$0.002
⚙️ Developer UtilitiesFree
RGB to decimal integer
24-bit color pack free
Aabuela
POST /color/rgb-int$0.002
⚙️ Developer UtilitiesFree
Color shades generator
tints and shades by stepping HSL lightness, free
AAspire
POST /color/shades$0.002
⚙️ Developer UtilitiesFree
Triadic color scheme generator
three hues at 120°, free
PPavilion
POST /color/triadic$0.002
⚙️ Developer UtilitiesFree
Combinations calculator
n choose r (binomial coefficient)
PPavilion
POST /combo/combinations$0.002
⚙️ Developer UtilitiesFree
Integer compositions calculator
ordered partitions into positive parts
PPavilion
POST /combo/compositions$0.002
⚙️ Developer UtilitiesFree
Derangement calculator
subfactorial !n, no fixed points
Aabuela
POST /combo/derangement$0.002
⚙️ Developer UtilitiesFree
Multinomial coefficient calculator
n! / (n1! n2! … nk!)
PPavilion
POST /combo/multinomial$0.002
⚙️ Developer UtilitiesFree
Integer partition calculator
p(n) ways to sum, free
AAspire
POST /combo/partition-count$0.002
⚙️ Developer UtilitiesFree
Pascal's triangle generator
first n rows with exact BigInt entries
Aabuela
POST /combo/pascal-triangle$0.002
⚙️ Developer UtilitiesFree
Permutations calculator
P(n,r) = n!/(n−r)! with BigInt
Aabuela
POST /combo/permutations$0.002
⚙️ Developer UtilitiesFree
Permutations with repetition
n^r ordered selections, free
AAspire
POST /combo/permutations-with-repetition$0.002
⚙️ Developer UtilitiesFree
Round-robin matches calculator
games and rounds for n teams
AAspire
POST /combo/round-robin$0.002
⚙️ Developer UtilitiesFree
Stirling numbers of the second kind
S(n,k) partitions, free
AAspire
POST /combo/stirling-second$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

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Free tools
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Balance
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