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
Speed converter
m/s, km/h, mph, knots, ft/s, free
PPavilion
POST /conv/speed$0.002
⚙️ Developer UtilitiesFree
Surface tension converter
N/m, mN/m, dyn/cm, lbf/ft, free
PPavilion
POST /conv/surface-tension$0.002
⚙️ Developer UtilitiesFree
Thermal conductivity converter
W/(m·K), BTU/(h·ft·°F), cal/(s·cm·°C) free
Ssamurai
POST /conv/thermal-conductivity$0.002
⚙️ Developer UtilitiesFree
Thermal resistance converter
K/W, °C/W, °F·h/BTU, free
AAspire
POST /conv/thermal-resistance$0.002
⚙️ Developer UtilitiesFree
Time unit converter
seconds, minutes, hours, days, weeks, ms and µs, free
AAspire
POST /conv/time$0.002
⚙️ Developer UtilitiesFree
Torque converter
N·m, N·cm, lbf·ft, lbf·in, kgf·m, free
PPavilion
POST /conv/torque$0.002
⚙️ Developer UtilitiesFree
Screen size converter
diagonal in/cm and W×H from aspect ratio, free
Aabuela
POST /conv/tv-size$0.002
⚙️ Developer UtilitiesFree
Points to pixels converter
pt, px and picas at 96 DPI, free
Aabuela
POST /conv/typography-pt-px$0.002
⚙️ Developer UtilitiesFree
PX to EM converter
CSS pixels ↔ em with base font size, free
Ssamurai
POST /conv/typography-px-em$0.002
⚙️ Developer UtilitiesFree
px to rem converter
CSS pixels ↔ rem with root font size
PPavilion
POST /conv/typography-px-rem$0.002
⚙️ Developer UtilitiesFree
Voltage converter
V, mV, µV, kV, MV, free
PPavilion
POST /conv/voltage$0.002
⚙️ Developer UtilitiesFree
Volume converter
liters, gallons, quarts, m³, ft³, free
Aabuela
POST /conv/volume$0.002
⚙️ Developer UtilitiesFree
Water hardness converter
ppm, mg/L, gpg, °dH free
Ssamurai
POST /conv/water-hardness$0.002
⚙️ Developer UtilitiesFree
Wire gauge converter
AWG to mm, inches & area, free
PPavilion
POST /conv/wire-gauge$0.002
⚙️ Developer UtilitiesFree
Complete the square calculator
vertex form a(x−h)²+k, free
Ssamurai
POST /algebra/complete-the-square$0.002
⚙️ Developer UtilitiesFree
Cross product calculator
3D vector a×b and parallelogram area, free
Ssamurai
POST /algebra/cross-product$0.002
⚙️ Developer UtilitiesFree
Exponent rules calculator
product, quotient, power, free
Ssamurai
POST /algebra/exponent-rules$0.002
⚙️ Developer UtilitiesFree
Linear inequality solver
ax+b ⊙ c for x, interval form, free
Ssamurai
POST /algebra/inequality-solver$0.002
⚙️ Developer UtilitiesFree
Matrix inverse calculator
Gauss-Jordan A⁻¹, free
Ssamurai
POST /algebra/matrix-inverse$0.002
⚙️ Developer UtilitiesFree
Matrix multiplication calculator
A×B product matrix, free
Ssamurai
POST /algebra/matrix-multiply$0.002
⚙️ Developer UtilitiesFree
Polynomial long division calculator
quotient and remainder, free
Ssamurai
POST /algebra/polynomial-divide$0.002
⚙️ Developer UtilitiesFree
Polynomial GCD calculator
Euclidean algorithm on coefficients, free
Ssamurai
POST /algebra/polynomial-gcd$0.002
⚙️ Developer UtilitiesFree
Reduced row echelon form calculator
Gauss-Jordan RREF, free
Ssamurai
POST /algebra/rref$0.002
⚙️ Developer UtilitiesFree
3×3 system of equations solver
Cramer's rule, free
Ssamurai
POST /algebra/system-3x3$0.002
⚙️ Developer UtilitiesFree
Absolute magnitude calculator
M from m and distance (pc), free
Ssamurai
POST /astro/absolute-magnitude$0.002
⚙️ Developer UtilitiesFree
Light travel time calculator
t = d/c from km or AU, free
Ssamurai
POST /astro/light-travel-time$0.002
⚙️ Developer UtilitiesFree
Planet density calculator
mean bulk density from M and R, free
Ssamurai
POST /astro/planet-density$0.002
⚙️ Developer UtilitiesFree
Schwarzschild radius calculator
Rs = 2GM/c² event horizon, free
Ssamurai
POST /astro/schwarzschild-radius$0.002
⚙️ Developer UtilitiesFree
Surface gravity calculator
g = G·M/R² in m/s², free
Ssamurai
POST /astro/surface-gravity$0.002
⚙️ Developer UtilitiesFree
Telescope resolution calculator
Rayleigh criterion θ=1.22λ/D, free
Ssamurai
POST /astro/telescope-resolution$0.002
⚙️ Developer UtilitiesFree
Arrhenius equation calculator
k = A·e^(−Ea/RT), free
Ssamurai
POST /chem/arrhenius$0.002
⚙️ Developer UtilitiesFree
Arrhenius temperature calculator
T from k, A, Ea, free
Ssamurai
POST /chem/arrhenius-temperature$0.002
⚙️ Developer UtilitiesFree
Average molecular speed calculator
v̄ = √(8RT/πM), free
Ssamurai
POST /chem/average-molecular-speed$0.002
⚙️ Developer UtilitiesFree
Average rate of reaction calculator
|Δc|/Δt from concentration, free
Ssamurai
POST /chem/average-reaction-rate$0.002
⚙️ Developer UtilitiesFree
Avogadro's law moles calculator
n₂ = n₁(V₂/V₁), free
Ssamurai
POST /chem/avogadro-law-moles$0.002
⚙️ Developer UtilitiesFree
Boiling point elevation calculator
ΔTb = i·Kb·m, free
Ssamurai
POST /chem/boiling-point-elevation$0.002
⚙️ Developer UtilitiesFree
Born-Haber lattice energy calculator
U from formation, sublimation, free
Ssamurai
POST /chem/born-haber-cycle$0.002
⚙️ Developer UtilitiesFree
Charles's law final volume calculator
V₂ = V₁(T₂/T₁), free
Ssamurai
POST /chem/charles-final-volume$0.002
⚙️ Developer UtilitiesFree
Vaporization enthalpy calculator
Clausius–Clapeyron ΔHvap from two, free
Ssamurai
POST /chem/clausius-clapeyron-enthalpy$0.002
⚙️ Developer UtilitiesFree
Combined gas law final volume calculator
V₂ = P₁V₁T₂/(P₂T₁), free
Ssamurai
POST /chem/combined-gas-final-volume$0.002
⚙️ Developer UtilitiesFree
Cryoscopic constant calculator
Kf = ΔTf/(i·m), free
Ssamurai
POST /chem/cryoscopic-constant$0.002
⚙️ Developer UtilitiesFree
Decay constant calculator
λ from half-life, free
Ssamurai
POST /chem/decay-constant-half-life$0.002
⚙️ Developer UtilitiesFree
Degree of dissociation calculator
α from van't Hoff factor i, free
Ssamurai
POST /chem/degree-dissociation-from-i$0.002
⚙️ Developer UtilitiesFree
Dilution factor calculator
DF = V_final/V_stock and fold dilution, free
Ssamurai
POST /chem/dilution-factor$0.002
⚙️ Developer UtilitiesFree
Degree of dissociation calculator
α from Kc and initial, free
Ssamurai
POST /chem/dissociation-from-kc$0.002
⚙️ Developer UtilitiesFree
Empirical formula from percent composition calculator
free
Ssamurai
POST /chem/empirical-from-percent$0.002
⚙️ Developer UtilitiesFree
Heat of formation from reaction calculator
unknown ΔH_f, free
Ssamurai
POST /chem/enthalpy-of-formation-unknown$0.002
⚙️ Developer UtilitiesFree
Molar enthalpy calculator
ΔH = Q/n from heat and moles, free
Ssamurai
POST /chem/enthalpy-per-mole$0.002
⚙️ Developer UtilitiesFree
Equilibrium constant from Gibbs calculator
K = exp(−ΔG°/RT), free
Ssamurai
POST /chem/equilibrium-from-gibbs$0.002
⚙️ Developer UtilitiesFree
Equilibrium yield calculator
percent of theoretical maximum at, free
Ssamurai
POST /chem/equilibrium-yield$0.002
⚙️ Developer UtilitiesFree
Formula units calculator
N = (m/M)·N_A from mass, free
Ssamurai
POST /chem/formula-units$0.002
⚙️ Developer UtilitiesFree
Fraction of molecules above Ea calculator
f = e^(−Ea/RT), free
Ssamurai
POST /chem/fraction-molecules-above-ea$0.002
⚙️ Developer UtilitiesFree
Freezing point depression calculator
ΔTf = i·Kf·m from molality, free
Ssamurai
POST /chem/freezing-point-depression-molality$0.002
⚙️ Developer UtilitiesFree
Fuel energy content calculator
E = m × energy density, free
Ssamurai
POST /chem/fuel-energy-content$0.002
⚙️ Developer UtilitiesFree
Effusion remaining fraction calculator
lighter gas left after, free
Ssamurai
POST /chem/gas-leak-effusion-fraction$0.002
⚙️ Developer UtilitiesFree
Gas stoichiometry volume calculator
product gas V from moles, free
Ssamurai
POST /chem/gas-stoichiometry-volume$0.002
⚙️ Developer UtilitiesFree
Gas volume at STP calculator
V = n × 22.4 L, free
Ssamurai
POST /chem/gas-stp-volume$0.002
⚙️ Developer UtilitiesFree
Gas temperature from P, V, n calculator
T = PV/nR (ideal gas), free
Ssamurai
POST /chem/gas-temperature-from-ptv$0.002
⚙️ Developer UtilitiesFree
Gas volume at NTP calculator
V = n × 24.0 L, free
Ssamurai
POST /chem/gas-volume-at-ntp$0.002
⚙️ Developer UtilitiesFree
Gibbs free energy calculator
ΔG = ΔH − TΔS from enthalpy, free
Ssamurai
POST /chem/gibbs-from-enthalpy-entropy$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
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.

Balance
$10.00+

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