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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TelegramLive
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
Coriolis parameter calculator
f = 2Ω sin(φ) from latitude
Ssamurai
POST /earth/coriolis-parameter$0.002
⚙️ Developer UtilitiesFree
Effective growing degree days calculator
GDD with upper cutoff
Ssamurai
POST /earth/degree-days-effective$0.002
⚙️ Developer UtilitiesFree
Density altitude from pressure altitude and temperature calculator
Kkatherine
POST /earth/density-altitude-from-pressure$0.002
⚙️ Developer UtilitiesFree
Sonntag 1990 dew point calculator from temperature and humidity
Kkatherine
POST /earth/dew-point-sonntag$0.002
⚙️ Developer UtilitiesFree
Diurnal temperature range calculator
daily max minus min average
Ssamurai
POST /earth/diurnal-temperature-range$0.002
⚙️ Developer UtilitiesFree
Equivalent potential temperature calculator
Bolton θe
Ssamurai
POST /earth/equivalent-potential-temperature$0.002
⚙️ Developer UtilitiesFree
Blaney-Criddle evapotranspiration calculator
estimate reference ET
Ffrances
POST /earth/evapotranspiration-blaney-criddle$0.002
⚙️ Developer UtilitiesFree
Hargreaves-Samani ET0 calculator
reference evapotranspiration
Ssamurai
POST /earth/evapotranspiration-hargreaves$0.002
⚙️ Developer UtilitiesFree
Ship Froude number calculator
hull speed and wave resistance
Ffrances
POST /earth/froude-wave-ship$0.002
⚙️ Developer UtilitiesFree
Geopotential to Geometric Height Calculator
Ffrances
POST /earth/geopotential-to-geometric-height$0.002
⚙️ Developer UtilitiesFree
Greywater Reuse Water Savings Calculator
Kkatherine
POST /earth/greywater-reuse-savings$0.002
⚙️ Developer UtilitiesFree
Growing degree days calculator
single-day averaging method
Bbarbara
POST /earth/growing-degree-days$0.002
⚙️ Developer UtilitiesFree
Growing Season Length Calculator from Daily Frost Data
Kkatherine
POST /earth/growing-season-length$0.002
⚙️ Developer UtilitiesFree
Simplified heat index calculator
Steadman approximation
Bbarbara
POST /earth/heat-index-simple$0.002
⚙️ Developer UtilitiesFree
Steadman apparent temperature calculator with wind and radiation
Bbarbara
POST /earth/heat-index-steadman$0.002
⚙️ Developer UtilitiesFree
Heat Pump Output from COP Calculator
Bbarbara
POST /earth/heat-pump-cop-output$0.002
⚙️ Developer UtilitiesFree
Hydraulic conductivity from permeability calculator
Kkatherine
POST /earth/hydraulic-conductivity$0.002
⚙️ Developer UtilitiesFree
Hydraulic Radius of Channel Calculator
Area ÷ Wetted Perimeter
Bbarbara
POST /earth/hydraulic-radius$0.002
⚙️ Developer UtilitiesFree
Solar inverter sizing calculator
convert array watts to AC rating
Kkatherine
POST /earth/inverter-sizing$0.002
⚙️ Developer UtilitiesFree
Koppen Climate Classification Calculator
Ffrances
POST /earth/koppen-classification$0.002
⚙️ Developer UtilitiesFree
Landfill methane generation calculator
first-order decay model
Ssamurai
POST /earth/landfill-methane$0.002
⚙️ Developer UtilitiesFree
Lifting condensation level temperature calculator
Bolton relation
Ffrances
POST /earth/lcl-temperature$0.002
⚙️ Developer UtilitiesFree
Longshore sediment transport rate calculator
CERC formula
PPavilion
POST /earth/longshore-transport$0.002
⚙️ Developer UtilitiesFree
Earthquake energy ratio between magnitudes calculator
Bbarbara
POST /earth/magnitude-energy-ratio$0.002
⚙️ Developer UtilitiesFree
Manning Open-Channel Discharge Calculator
Kkatherine
POST /earth/manning-discharge$0.002
⚙️ Developer UtilitiesFree
Atmospheric moisture flux calculator
q × wind for water vapor transport
PPavilion
POST /earth/moisture-flux$0.002
⚙️ Developer UtilitiesFree
Annual pluviometric index calculator
compare rainfall with the mean
Bbarbara
POST /earth/pluviometric-index$0.002
⚙️ Developer UtilitiesFree
Radiometric age calculator
age from parent/daughter ratio and λ
Ssamurai
POST /earth/radiometric-age-general$0.002
⚙️ Developer UtilitiesFree
Uranium-lead radiometric age calculator
206Pb/238U dating free
PPavilion
POST /earth/radiometric-age-u-pb$0.002
⚙️ Developer UtilitiesFree
Refrigerant leak CO2 equivalent calculator
Bbarbara
POST /earth/refrigerant-co2-equivalent$0.002
⚙️ Developer UtilitiesFree
Relative humidity from specific humidity
RH from q, T, P
PPavilion
POST /earth/relative-humidity-specific$0.002
⚙️ Developer UtilitiesFree
Richter magnitude from amplitude calculator
seismograph and distance
Kkatherine
POST /earth/richter-from-amplitude$0.002
⚙️ Developer UtilitiesFree
Atmospheric scale height calculator
temperature, molar mass and gravity
Kkatherine
POST /earth/scale-height$0.002
⚙️ Developer UtilitiesFree
Seawater density calculator from salinity, temperature and pressure
Ffrances
POST /earth/seawater-density$0.002
⚙️ Developer UtilitiesFree
Sediment compaction porosity calculator
exponential depth law
PPavilion
POST /earth/sediment-compaction$0.002
⚙️ Developer UtilitiesFree
Sediment Accumulation Rate Calculator
Ffrances
POST /earth/sedimentation-rate$0.002
⚙️ Developer UtilitiesFree
Radiation shielding half-value layer calculator
Kkatherine
POST /earth/shielding-half-value-layer$0.002
⚙️ Developer UtilitiesFree
Significant wave height calculator
Hs from wave record
PPavilion
POST /earth/significant-wave-height$0.002
⚙️ Developer UtilitiesFree
Snow-to-liquid ratio calculator
snowfall from liquid precip
PPavilion
POST /earth/snow-to-liquid-ratio$0.002
⚙️ Developer UtilitiesFree
Solar panels needed for net zero
count from annual kWh and panel yield
Ssamurai
POST /earth/solar-panel-breakeven-count$0.002
⚙️ Developer UtilitiesFree
Solar Panel Payback Period Calculator
Bbarbara
POST /earth/solar-payback-period$0.002
⚙️ Developer UtilitiesFree
Solar panel power output calculator
PV watts from irradiance
PPavilion
POST /earth/solar-power-output$0.002
⚙️ Developer UtilitiesFree
Groundwater Specific Discharge Calculator
Darcy Flux and Velocity
Bbarbara
POST /earth/specific-discharge$0.002
⚙️ Developer UtilitiesFree
Specific humidity to mixing ratio calculator
Kkatherine
POST /earth/specific-humidity-to-mixing-ratio$0.002
⚙️ Developer UtilitiesFree
Tidal prism volume calculator
estuary water exchange
Ffrances
POST /earth/tidal-prism$0.002
⚙️ Developer UtilitiesFree
True wind from apparent wind calculator
TWS and direction free
Aabuela
POST /earth/true-wind-from-apparent$0.002
⚙️ Developer UtilitiesFree
Recycling CO2 savings calculator
avoided landfill emissions
Ffrances
POST /earth/waste-recycling-co2-savings$0.002
⚙️ Developer UtilitiesFree
Absolute water vapor density calculator
ρv from e and T (ideal gas)
Ssamurai
POST /earth/water-vapor-density$0.002
⚙️ Developer UtilitiesFree
Ocean Wave Group Velocity Calculator
Wavelength and Depth
Bbarbara
POST /earth/wave-group-velocity$0.002
⚙️ Developer UtilitiesFree
Deep-water wave celerity from period
phase speed c = gT/(2π)
Ssamurai
POST /earth/wave-speed-from-period$0.002
⚙️ Developer UtilitiesFree
WBGT estimate from temperature and humidity calculator
Kkatherine
POST /earth/wbgt-estimate$0.002
⚙️ Developer UtilitiesFree
Old wind chill calculator
Siple & Passel 1945 index
Ssamurai
POST /earth/wind-chill-old$0.002
⚙️ Developer UtilitiesFree
Wind direction to 32-point compass calculator
Kkatherine
POST /earth/wind-direction-to-compass-32$0.002
⚙️ Developer UtilitiesFree
Billable weight calculator
chargeable weight from actual vs dimensional
Ssamurai
POST /ecom/billable-weight$0.002
⚙️ Developer UtilitiesFree
Boxes per pallet calculator
calculate layers and total boxes
Ffrances
POST /ecom/boxes-per-pallet$0.002
⚙️ Developer UtilitiesFree
Cash on delivery total calculator
goods + shipping + COD fee
Ssamurai
POST /ecom/cod-total$0.002
⚙️ Developer UtilitiesFree
Shipping fuel surcharge calculator
freight total with fuel %
Aabuela
POST /ecom/fuel-surcharge$0.002
⚙️ Developer UtilitiesFree
Order handling fee calculator
fixed and percentage fees
Kkatherine
POST /ecom/handling-fee$0.002
⚙️ Developer UtilitiesFree
Import Tax and VAT Estimate Calculator
Bbarbara
POST /ecom/import-tax-estimate$0.002
⚙️ Developer UtilitiesFree
Pallet positions in container calculator
floor capacity and space left
Ffrances
POST /ecom/pallet-positions$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.