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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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
Divisibility test
check if one integer is evenly divisible by another
Hhedy
POST /math/divisibility-test$0.002
⚙️ Developer UtilitiesFree
Divisor calculator
all positive divisors of an integer, sorted
Ggrace
POST /math/divisor$0.002
⚙️ Developer UtilitiesFree
Regular dodecagon
area, perimeter and interior angle from the side length
Hhedy
POST /math/dodecagon$0.002
⚙️ Developer UtilitiesFree
Double-angle formula
evaluate sin(2x), cos(2x) or tan(2x) from one angle
Ggrace
POST /math/double-angle-formula$0.002
⚙️ Developer UtilitiesFree
Double-angle identities
sin(2x), cos(2x) and tan(2x) from one angle
Ggrace
POST /math/double-angle-identities$0.002
⚙️ Developer UtilitiesFree
e^x calculator
exponential of x online, free
Ggrace
POST /math/e-power-x$0.002
⚙️ Developer UtilitiesFree
Egyptian fraction calculator
distinct unit fraction expansion, free
Hhedy
POST /math/egyptian-fraction$0.002
⚙️ Developer UtilitiesFree
Eigenvalue and eigenvector calculator
any square matrix, free
Hhedy
POST /math/eigenvalue-eigenvector$0.002
⚙️ Developer UtilitiesFree
Elimination method
solve a system of two linear equations, free
Ggrace
POST /math/elimination-method$0.002
⚙️ Developer UtilitiesFree
Ellipse circumference calculator
Ramanujan approximation from semi-axes
Ggrace
POST /math/ellipse-circumference$0.002
⚙️ Developer UtilitiesFree
Ellipse perimeter
Ramanujan approximation from the semi-axes
Hhedy
POST /math/ellipse-perimeter$0.002
⚙️ Developer UtilitiesFree
Ellipse standard form
center and semi-axes from the general equation
Hhedy
POST /math/ellipse-standard-form$0.002
⚙️ Developer UtilitiesFree
Endpoint calculator
find the missing endpoint from the midpoint
Ggrace
POST /math/endpoint$0.002
⚙️ Developer UtilitiesFree
Engineering notation
coefficient and exponent (multiple of 3)
Hhedy
POST /math/engineering-notation$0.002
⚙️ Developer UtilitiesFree
Equation of a circle from diameter endpoints
center, radius
Hhedy
POST /math/equation-circle-diameter-endpoints$0.002
⚙️ Developer UtilitiesFree
Equation of a plane
from three points or a point and normal vector
Ggrace
POST /math/equation-of-a-plane$0.002
⚙️ Developer UtilitiesFree
Equilateral triangle area calculator
area from side length, free
Ggrace
POST /math/equilateral-triangle-area$0.002
⚙️ Developer UtilitiesFree
Equivalent fractions calculator
multiply numerator and denominator, free
Hhedy
POST /math/equivalent-fractions$0.002
⚙️ Developer UtilitiesFree
Equivalent ratio calculator
scale numerator and denominator free
Ggrace
POST /math/equivalent-ratio$0.002
⚙️ Developer UtilitiesFree
Error function calculator
erf(x) between -1 and 1
Hhedy
POST /math/error-function$0.002
⚙️ Developer UtilitiesFree
Euclidean algorithm calculator
GCD with every division step
Ggrace
POST /math/euclidean-algorithm$0.002
⚙️ Developer UtilitiesFree
Euclidean distance calculator
distance between two vectors, free
Hhedy
POST /math/euclidean-distance$0.002
⚙️ Developer UtilitiesFree
Euler's polyhedron formula calculator
V − E + F = 2, free
Ggrace
POST /math/eulers-formula-for-polyhedron$0.002
⚙️ Developer UtilitiesFree
Exact value of trig functions
sin cos tan csc sec cot in radicals, free
Hhedy
POST /math/exact-value-of-trig-functions$0.002
⚙️ Developer UtilitiesFree
Expanded form calculator
expand a number into place-value terms
Ggrace
POST /math/expanded-form$0.002
⚙️ Developer UtilitiesFree
Expanding logarithms
product, quotient and power rules
Ggrace
POST /math/expanding-logarithms$0.002
⚙️ Developer UtilitiesFree
Exponent calculator
raise any base to any power
Hhedy
POST /math/exponent$0.002
⚙️ Developer UtilitiesFree
Exponential form
write any number as mantissa times ten to a power, free
Ggrace
POST /math/exponential-form$0.002
⚙️ Developer UtilitiesFree
Exponential function calculator
evaluate a·b^x
Hhedy
POST /math/exponential-function$0.002
⚙️ Developer UtilitiesFree
Exterior angles of a triangle calculator
from the three interior angles
Hhedy
POST /math/exterior-angles-of-a-triangle$0.002
📄 Documents & PDFFree
Booklet imposition sheets calculator
pages, sheets and blanks
Ffrances
POST /pdf/booklet-sheets$0.002
📄 Documents & PDFFree
Duplex pages to sheets calculator
double-sided printing
Bbarbara
POST /pdf/duplex-pages-to-sheets$0.002
📄 Documents & PDFFree
Leaflet panels from folds calculator
bi-fold, tri-fold and more
Ffrances
POST /pdf/leaflet-folds$0.002
⚙️ Developer UtilitiesFree
Rent vs Buy Equipment Calculator
Compare Total Costs
Kkatherine
POST /realestate/rent-vs-buy-equipment$0.002
⚙️ Developer UtilitiesFree
Most frequent value calculator
find modes and counts in a list
Aabuela
POST /stat/most-frequent-value$0.002
⚙️ Developer UtilitiesFree
Percent change between values calculator
increase or decrease
Ffrances
POST /stat/percent-change$0.002
⚙️ Developer UtilitiesFree
Total monthly subscriptions cost calculator
recurring spend free
Ssamurai
POST /str/monthly-subscriptions-total$0.002
⚙️ Developer UtilitiesFree
Spell out dollar amount calculator
invoices & contracts, free
Ssamurai
POST /str/spell-dollar-amount$0.002
⚙️ Developer UtilitiesFree
Overnight layover cost calculator
compare with a direct flight
Ffrances
POST /travel/overnight-layover-cost$0.002
🎬 VideoFree
Streaming services total cost calculator
monthly and yearly bundle cost
Ffrances
POST /video/streaming-total-cost$0.002
⚙️ Developer UtilitiesFree
Bishop Score Calculator
Cervical Readiness Assessment
Bbarbara
POST /health/bishop-score$0.002
⚙️ Developer UtilitiesFree
Pediatric BMI z-score calculator
LMS method from L, M, S
Ssamurai
POST /health/bmi-z-pediatric$0.002
⚙️ Developer UtilitiesFree
Corrected reticulocyte count calculator
retic% × Hct / normal Hct
Aabuela
POST /health/corrected-reticulocyte$0.002
⚙️ Developer UtilitiesFree
Creatinine clearance calculator
Cockcroft-Gault CrCl free
PPavilion
POST /health/creatinine-clearance$0.002
⚙️ Developer UtilitiesFree
Due date from CRL ultrasound calculator
gestational age free
PPavilion
POST /health/due-date-crl$0.002
⚙️ Developer UtilitiesFree
FIB-4 liver fibrosis calculator
age, AST, ALT and platelets
Kkatherine
POST /health/fib4$0.002
⚙️ Developer UtilitiesFree
HOMA-IR insulin resistance calculator
fasting glucose and insulin
Bbarbara
POST /health/homa-ir$0.002
⚙️ Developer UtilitiesFree
IVF transfer due date calculator
embryo age to estimated delivery date
Ssamurai
POST /health/ivf-due-date$0.002
⚙️ Developer UtilitiesFree
Optimal nap length calculator
find your nap end time
Kkatherine
POST /health/nap-length$0.002
⚙️ Developer UtilitiesFree
QTc Framingham Calculator
Correct QT for Heart Rate
Ffrances
POST /health/qtc-framingham$0.002
⚙️ Developer UtilitiesFree
Wake time after sleep cycles calculator
Ffrances
POST /health/wake-after-cycles$0.002
⚙️ Developer UtilitiesFree
Pregnancy weeks to months converter
four-week months
Ffrances
POST /health/weeks-to-months-preg$0.002
⚙️ Developer UtilitiesFree
Brick wall calculator
estimate bricks and mortar joints
Kkatherine
POST /home/brick-wall$0.002
⚙️ Developer UtilitiesFree
Ceiling joist count calculator
joists from room length and OC spacing
Aabuela
POST /home/ceiling-joist-count$0.002
⚙️ Developer UtilitiesFree
Collar tie count calculator
ties from ridge length and required spacing
Aabuela
POST /home/collar-tie-count$0.002
⚙️ Developer UtilitiesFree
Concrete bag calculator
40, 60, or 80 lb bags from volume
Kkatherine
POST /home/concrete-bags$0.002
⚙️ Developer UtilitiesFree
Concrete pier calculator
cylindrical pier and tube form volume
Ffrances
POST /home/concrete-pier$0.002
⚙️ Developer UtilitiesFree
Corner stud count calculator
extra studs for corners and tees
Ssamurai
POST /home/corner-studs$0.002
⚙️ Developer UtilitiesFree
Deck footing count calculator
estimate posts and concrete footings
Ffrances
POST /home/deck-footing-count$0.002
⚙️ Developer UtilitiesFree
Drip Edge Calculator
Linear Feet and 10-Foot Pieces
Ffrances
POST /home/drip-edge$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