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
EmailLive
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iOS & AndroidBuilding
WhatsAppComing
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
Area converter
m², ft², acres, hectares, mi², km² free
Ssamurai
POST /conv/area$0.002
⚙️ Developer UtilitiesFree
Astronomical distance converter
AU, ly, pc, km, mi, free
PPavilion
POST /conv/astronomical-distance$0.002
⚙️ Developer UtilitiesFree
Blood glucose converter
mg/dL ↔ mmol/L free
Ssamurai
POST /conv/blood-glucose$0.002
⚙️ Developer UtilitiesFree
Bra size converter
US, UK, EU, French & Australian sizes, free
Ssamurai
POST /conv/bra-size$0.002
⚙️ Developer UtilitiesFree
Capacitance converter
farads, millifarads, microfarads, picofarads, free
AAspire
POST /conv/capacitance$0.002
⚙️ Developer UtilitiesFree
Catalytic activity converter
katal, µkat, nkat and enzyme units (U), free
PPavilion
POST /conv/catalytic-activity$0.002
⚙️ Developer UtilitiesFree
Cholesterol unit converter
mg/dL ↔ mmol/L for total, HDL and LDL, free
AAspire
POST /conv/cholesterol$0.002
⚙️ Developer UtilitiesFree
Clothing size converter
US, UK, EU and S/M/L, free
Aabuela
POST /conv/clothing-size$0.002
⚙️ Developer UtilitiesFree
Molar concentration converter
mol/L, mmol/L, µmol/L, mol/m³ free
Ssamurai
POST /conv/concentration$0.002
⚙️ Developer UtilitiesFree
Conductance converter
siemens, millisiemens, microsiemens, free
AAspire
POST /conv/conductance$0.002
⚙️ Developer UtilitiesFree
Data transfer rate converter
bps, Mbps, MB/s, free
Aabuela
POST /conv/data-rate$0.002
⚙️ Developer UtilitiesFree
Digital storage converter
bytes, KB, MB, GB, TB, KiB, MiB free
Ssamurai
POST /conv/data-size$0.002
⚙️ Developer UtilitiesFree
Density converter
kg/m³, g/cm³, lb/ft³ and lb/gal, free
AAspire
POST /conv/density$0.002
⚙️ Developer UtilitiesFree
Dynamic viscosity converter
Pa·s, poise, cP, lbf·s/ft² free
Ssamurai
POST /conv/dynamic-viscosity$0.002
⚙️ Developer UtilitiesFree
Electric charge converter
C, mC, µC, Ah, mAh, e free
Ssamurai
POST /conv/electric-charge$0.002
⚙️ Developer UtilitiesFree
Electric current converter
A, mA, µA, kA, abA, free
Aabuela
POST /conv/electric-current$0.002
⚙️ Developer UtilitiesFree
Electric field strength converter
V/m, V/cm, kV/m, V/mil, free
PPavilion
POST /conv/electric-field$0.002
⚙️ Developer UtilitiesFree
Energy converter
joules, calories, kWh, BTU, eV, free
Aabuela
POST /conv/energy$0.002
⚙️ Developer UtilitiesFree
Fahrenheit to Celsius converter
exact (F−32)×5/9, free
PPavilion
POST /conv/fahrenheit-to-celsius$0.002
⚙️ Developer UtilitiesFree
Volume flow rate converter
L/s, m³/h, GPM, CFM, free
Aabuela
POST /conv/flow-rate$0.002
⚙️ Developer UtilitiesFree
Force converter
newtons, kN, dynes, lbf, kgf, poundals, free
Aabuela
POST /conv/force$0.002
⚙️ Developer UtilitiesFree
Frequency converter
Hz, kHz, MHz, GHz, RPM, rad/s free
Ssamurai
POST /conv/frequency$0.002
⚙️ Developer UtilitiesFree
Frequency wavelength converter
f ↔ λ with c or custom speed, free
Ssamurai
POST /conv/frequency-wavelength$0.002
⚙️ Developer UtilitiesFree
Fuel economy converter
MPG US, MPG imperial, km/L and L/100km, free
AAspire
POST /conv/fuel-economy$0.002
⚙️ Developer UtilitiesFree
Fuel price unit converter
US gal, imperial gal, liter, free
Aabuela
POST /conv/fuel-price$0.002
⚙️ Developer UtilitiesFree
Grain weight converter
grains, grams, milligrams, ounces, free
Aabuela
POST /conv/grain-weight$0.002
⚙️ Developer UtilitiesFree
Hat size converter
US fitted, UK, EU cm, head circumference, free
AAspire
POST /conv/hat-size$0.002
⚙️ Developer UtilitiesFree
Heat flux density converter
W/m², W/cm², BTU/(h·ft²), cal/(s·cm²), free
AAspire
POST /conv/heat-flux$0.002
⚙️ Developer UtilitiesFree
Heat transfer coefficient converter
W/(m²·K), BTU/(h·ft²·°F), free
Ssamurai
POST /conv/heat-transfer-coefficient$0.002
⚙️ Developer UtilitiesFree
Illuminance converter
lux, foot-candles, phot, lm/m² free
Ssamurai
POST /conv/illuminance$0.002
⚙️ Developer UtilitiesFree
Inductance converter
H, mH, µH, nH, pH, free
Aabuela
POST /conv/inductance$0.002
⚙️ Developer UtilitiesFree
Gold karat converter
karats, fineness, purity %, free
PPavilion
POST /conv/karat-gold$0.002
⚙️ Developer UtilitiesFree
Kinematic viscosity converter
m²/s, stokes, centistokes and ft²/s, free
AAspire
POST /conv/kinematic-viscosity$0.002
⚙️ Developer UtilitiesFree
Luminance converter
nit, stilb, lambert, foot-lambert and apostilb, free
AAspire
POST /conv/luminance$0.002
⚙️ Developer UtilitiesFree
Luminous flux converter
lm, mlm, µlm, klm, Mlm, free
PPavilion
POST /conv/luminous-flux$0.002
⚙️ Developer UtilitiesFree
Luminous intensity converter
cd, mcd, kcd, candlepower, free
Aabuela
POST /conv/luminous-intensity$0.002
⚙️ Developer UtilitiesFree
Magnetic flux converter
weber, milliweber, microweber, maxwell, free
AAspire
POST /conv/magnetic-flux$0.002
⚙️ Developer UtilitiesFree
Magnetic flux density converter
tesla, millitesla, gauss, Wb/m², free
AAspire
POST /conv/magnetic-flux-density$0.002
⚙️ Developer UtilitiesFree
Mass converter
kg, g, lb, oz, stone, tonne and mg, free
AAspire
POST /conv/mass$0.002
⚙️ Developer UtilitiesFree
Mass flow rate converter
kg/s, g/s, lb/h, t/h, free
Aabuela
POST /conv/mass-flow-rate$0.002
⚙️ Developer UtilitiesFree
Molar mass converter
g/mol, kg/mol, kg/kmol, free
Aabuela
POST /conv/molar-mass$0.002
⚙️ Developer UtilitiesFree
Momentum converter
kg·m/s, g·cm/s, lb·ft/s free
Ssamurai
POST /conv/momentum$0.002
⚙️ Developer UtilitiesFree
Running pace converter
min/km, min/mile, km/h and mph, free
AAspire
POST /conv/pace$0.002
⚙️ Developer UtilitiesFree
Paper size dimensions
ISO A B C, US Letter, Legal, Tabloid, free
AAspire
POST /conv/paper-size$0.002
⚙️ Developer UtilitiesFree
Paper weight converter
gsm ↔ lb for text, bond, cover, index
Ssamurai
POST /conv/paper-weight$0.002
⚙️ Developer UtilitiesFree
Power converter
W, kW, MW, hp, BTU/h, ft·lb/s free
Ssamurai
POST /conv/power$0.002
⚙️ Developer UtilitiesFree
PPM percent converter
ppm, ppb, percent and per-mille free
AAspire
POST /conv/ppm$0.002
⚙️ Developer UtilitiesFree
Radiation exposure converter
C/kg, roentgen, mR, free
Aabuela
POST /conv/radiation-exposure$0.002
⚙️ Developer UtilitiesFree
Radioactivity converter
Bq, Ci, Rd and SI multiples, free
PPavilion
POST /conv/radioactivity$0.002
⚙️ Developer UtilitiesFree
Electrical resistance converter
ohms, mΩ, kΩ, MΩ, GΩ free
Ssamurai
POST /conv/resistance$0.002
⚙️ Developer UtilitiesFree
Electrical resistivity converter
Ω·m, Ω·cm, μΩ·cm, Ω·cmil/ft free
Ssamurai
POST /conv/resistivity$0.002
⚙️ Developer UtilitiesFree
Ring size converter
US, UK, EU and diameter mm equivalents, free
AAspire
POST /conv/ring-size$0.002
⚙️ Developer UtilitiesFree
Roof pitch converter
rise-in-12, degrees and percent slope, free
Aabuela
POST /conv/roof-pitch$0.002
⚙️ Developer UtilitiesFree
Shoe size converter
US, UK, EU and cm, men & women, free
PPavilion
POST /conv/shoe-size$0.002
⚙️ Developer UtilitiesFree
Slope grade converter
percent grade, degrees and rise-over-run, free
AAspire
POST /conv/slope-grade$0.002
⚙️ Developer UtilitiesFree
Solid angle converter
steradians, deg², spat, sphere free
Ssamurai
POST /conv/solid-angle$0.002
⚙️ Developer UtilitiesFree
Sound pressure level converter
Pa ↔ dB SPL, free
Aabuela
POST /conv/sound-level$0.002
⚙️ Developer UtilitiesFree
Specific energy converter
J/kg, kJ/kg, cal/g, BTU/lb, free
Aabuela
POST /conv/specific-energy$0.002
⚙️ Developer UtilitiesFree
Specific heat capacity converter
J/(kg·K), cal/(g·°C), BTU/(lb·°F), free
PPavilion
POST /conv/specific-heat$0.002
⚙️ Developer UtilitiesFree
Specific volume converter
m³/kg, L/kg, ft³/lb, free
Aabuela
POST /conv/specific-volume$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.

Balance
$10.00+

Top up your balance and spend it across web, API and the app. It never expires.