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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Get your API key Browse the catalog
7825ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesNull space calculatorkernel basis of a matrix from its rowsSsamurai$0.002Open math.null_space →New⚙️ Developer UtilitiesLogical NOR calculatortrue only when both inputs are falsePPavilion$0.002Open math.nor →New⚙️ Developer UtilitiesMultiply complex numbers(a+bi)(c+di) product, freeAabuela$0.002Open math.multiply_complex_numbers →New⚙️ Developer UtilitiesMöbius strip calculatorsurface area and edge lengthSsamurai$0.002Open math.mobius_strip →New⚙️ Developer UtilitiesLong multiplication calculatordigit-by-digit product, freeAabuela$0.002Open math.long_multiplication →New⚙️ Developer UtilitiesMean calculatorarithmetic mean of a list of numbersPPavilion$0.002Open math.mean →New⚙️ Developer UtilitiesLog2 calculatorbase-2 logarithm of a positive numberSsamurai$0.002Open math.log_2 →New⚙️ Developer UtilitiesLine of intersection of two planesparametric formAabuela$0.002Open math.line_of_intersection_of_two_planes →New⚙️ Developer UtilitiesLinear-feedback shift registerLFSR bit sequence from tapsSsamurai$0.002Open math.linear_feedback_shift_register →New⚙️ Developer UtilitiesLinear combination calculatorweighted sum of vectorsPPavilion$0.002Open math.linear_combination →New⚙️ Developer UtilitiesLength of a rectangle calculatorfrom area and width, freeAabuela$0.002Open math.length_of_a_rectangle →New⚙️ Developer UtilitiesLeast to greatest fractionssort a list from smallest to largestPPavilion$0.002Open math.least_to_greatest_fractions →

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
Capacitor voltage rating selector
derate working voltage to a standard rating
AAspire
POST /elec/capacitor-voltage-rating$0.002
⚙️ Developer UtilitiesFree
Drift velocity calculator
find vd from current, n, A and q
AAspire
POST /elec/drift-velocity$0.002
⚙️ Developer UtilitiesFree
Transformer turns ratio calculator
Np/Ns and voltages, free
AAspire
POST /elec/transformer-turns$0.002
⚙️ Developer UtilitiesFree
Damm check digit
compute and validate, catch typos free
PPavilion
POST /enc/damm$0.002
⚙️ Developer UtilitiesFree
Keyword substitution cipher
encrypt & decrypt online, free
PPavilion
POST /enc/keyword-cipher$0.002
⚙️ Developer UtilitiesFree
Scytale cipher
encrypt or decrypt with a column transposition
PPavilion
POST /enc/scytale$0.002
⚙️ Developer UtilitiesFree
encodeURIComponent tool
encode and decode URI components, free
PPavilion
POST /enc/url-component$0.002
⚙️ Developer UtilitiesFree
UTF-16 code unit converter
encode or decode hex, free
PPavilion
POST /enc/utf16$0.002
⚙️ Developer UtilitiesFree
Octal to decimal converter
base-8 string to integer, free
PPavilion
POST /fmt/octal-decimal$0.002
⚙️ Developer UtilitiesFree
Cardinal to ordinal number converter
1st, 2nd, 3rd, free
PPavilion
POST /fmt/ordinal$0.002
⚙️ Developer UtilitiesFree
Initial bearing calculator
forward azimuth between two coordinates
Aabuela
POST /geo/bearing$0.002
⚙️ Developer UtilitiesFree
Crosswind component calculator
wind speed and angle, free
Aabuela
POST /geo/crosswind-component$0.002
⚙️ Developer UtilitiesFree
Geohash encoder
latitude and longitude to a compact string
Aabuela
POST /geo/geohash-encode$0.002
⚙️ Developer UtilitiesFree
Geographic midpoint calculator
great-circle halfway point free
Aabuela
POST /geo/midpoint$0.002
⚙️ Developer UtilitiesFree
Geographic polygon perimeter
great-circle length of a lat/lon ring
Aabuela
POST /geo/polygon-perimeter$0.002
⚙️ Developer UtilitiesFree
Pythagorean equirectangular distance
approximate ground metres between two points
Aabuela
POST /geo/pythagorean-geo-distance$0.002
⚙️ Developer UtilitiesFree
Capsule volume & surface area
stadium of revolution, free
Ssamurai
POST /geom/capsule$0.002
⚙️ Developer UtilitiesFree
Hyperbola eccentricity
from semi-axes a and b, free
Ssamurai
POST /geom/hyperbola-eccentricity$0.002
⚙️ Developer UtilitiesFree
Polygon interior angle calculator
sum, exterior & per-angle
Ssamurai
POST /geom/polygon-interior-angle$0.002
⚙️ Developer UtilitiesFree
Star polygon area calculator
regular {n/d} area from points, density, radius
Ssamurai
POST /geom/star-polygon-area$0.002
⚙️ Developer UtilitiesFree
Triangle incenter calculator
incenter and inradius from vertices
Ssamurai
POST /geom/triangle-incenter$0.002
⚙️ Developer UtilitiesFree
Mifflin-St Jeor BMR calculator
basal metabolic rate from weight, height, age and sex
Aabuela
POST /health/bmr-mifflin$0.002
⚙️ Developer UtilitiesFree
Caffeine dose by body weight
mg from mg/kg target, free
Aabuela
POST /health/caffeine-per-kg$0.002
⚙️ Developer UtilitiesFree
eGFR kidney function calculator
CKD-EPI creatinine free
Aabuela
POST /health/egfr$0.002
⚙️ Developer UtilitiesFree
Fat mass from body fat %
convert weight and percent to kg
Aabuela
POST /health/fat-mass-from-percent$0.002
⚙️ Developer UtilitiesFree
Ponderal index calculator
mass over height cubed, free
Aabuela
POST /health/ponderal-index$0.002
⚙️ Developer UtilitiesFree
Metronome subdivision calculator
duration in ms and frequency from tempo
Aabuela
POST /hobby/metronome-subdivision$0.002
⚙️ Developer UtilitiesFree
Home circuit count calculator
lighting & outlets from sq ft
Aabuela
POST /home/circuit-count$0.002
⚙️ Developer UtilitiesFree
Metal roofing panel calculator
panels from roof area and overlap
Aabuela
POST /home/metal-roofing-panels$0.002
⚙️ Developer UtilitiesFree
Sod calculator
rolls and pallets from lawn area and waste
Aabuela
POST /home/sod$0.002
⚙️ Developer UtilitiesFree
Harmonic series calculator
n-th partial sum H_n
Ssamurai
POST /math/harmonic-series$0.002
⚙️ Developer UtilitiesFree
Prime factorization
break any integer into primes and exponents
Ssamurai
POST /math/prime-factorization$0.002
⚙️ Developer UtilitiesFree
Projectile range calculator
speed, angle and gravity, free
AAspire
POST /mech/projectile-range$0.002
⚙️ Developer UtilitiesFree
Time of flight calculator
projectile launch speed, angle, gravity
AAspire
POST /mech/projectile-time-of-flight$0.002
⚙️ Developer UtilitiesFree
Simple pendulum period
T = 2π√(L/g) online
AAspire
POST /mech/simple-pendulum$0.002
⚙️ Developer UtilitiesFree
Flywheel spin-down time
inertia, speed, and braking torque
AAspire
POST /mech/spin-down-time$0.002
⚙️ Developer UtilitiesFree
List all ordered compositions of an integer
free
Ssamurai
POST /numth/compositions-list$0.002
⚙️ Developer UtilitiesFree
Discrete logarithm solver
baby-step giant-step mod p
Ssamurai
POST /numth/discrete-log$0.002
⚙️ Developer UtilitiesFree
Divisors of a number
list, count and sum, free
Ssamurai
POST /numth/divisor-list$0.002
⚙️ Developer UtilitiesFree
Is prime checker
trial division and Miller–Rabin, free
Ssamurai
POST /numth/prime-checker$0.002
⚙️ Developer UtilitiesFree
Acoustic resonance Q factor calculator
f0 over half-power bandwidth
AAspire
POST /optics/acoustic-resonance-q-factor$0.002
⚙️ Developer UtilitiesFree
Lensmaker's equation
focal length from n, R1, R2
AAspire
POST /optics/lensmaker$0.002
⚙️ Developer UtilitiesFree
Wavelength calculator
speed divided by frequency, free
AAspire
POST /phys/wavelength$0.002
⚙️ Developer UtilitiesFree
Durbin-Watson statistic calculator
first-order residual autocorrelation
Ssamurai
POST /stat/durbin-watson$0.002
⚙️ Developer UtilitiesFree
Tukey HSD post-hoc
pairwise comparisons after ANOVA, free
Ssamurai
POST /stat/tukey-hsd$0.002
⚙️ Developer UtilitiesFree
Reverse line order
flip text lines top to bottom, free
PPavilion
POST /str/reverse-lines$0.002
⚙️ Developer UtilitiesFree
Charles's law calculator
find V2 or T2 at constant pressure
AAspire
POST /thermo/charles-law$0.002
⚙️ Developer UtilitiesFree
EV trip charging cost
distance, efficiency, and electricity price
Aabuela
POST /travel/ev-trip-cost$0.002
⚙️ Developer UtilitiesFree
Half-angle calculator
sin, cos, tan of half the angle with correct signs
Ssamurai
POST /trig/half-angle$0.002
⚙️ Developer UtilitiesFree
Rectangular to polar converter
r and theta in the correct quadrant
Ssamurai
POST /trig/rectangular-to-polar$0.002
⚙️ Developer UtilitiesFree
Midline of a sinusoidal function
find y = D from the vertical shift
Ssamurai
POST /trig/sinusoid-midline$0.002
⚙️ Developer UtilitiesFree
EMC field strength converter
V/m, dBµV/m, A/m, free
Aabuela
POST /conv/emc-field-strength$0.002
⚙️ Developer UtilitiesFree
First-order reaction time calculator
t = ln([A]₀/[A])/k, free
Ssamurai
POST /chem/first-order-time$0.002
⚙️ Developer UtilitiesFree
Absorbed dose converter
Gy, mGy, rad and erg/g, free
PPavilion
POST /conv/absorbed-dose$0.002
⚙️ Developer UtilitiesFree
Acceleration converter
m/s², ft/s², g and gal, free
AAspire
POST /conv/acceleration$0.002
⚙️ Developer UtilitiesFree
Mole unit converter
mol, mmol, µmol, kmol and lb-mol, free
AAspire
POST /conv/amount-of-substance$0.002
⚙️ Developer UtilitiesFree
Angle converter
degrees, radians, gradians, turns, free
PPavilion
POST /conv/angle$0.002
⚙️ Developer UtilitiesFree
Angular acceleration converter
rad/s², deg/s² and rev/min², free
AAspire
POST /conv/angular-acceleration$0.002
⚙️ Developer UtilitiesFree
Angular velocity converter
rad/s, deg/s, RPM, RPS free
Ssamurai
POST /conv/angular-velocity$0.002
⚙️ Developer UtilitiesFree
Area converter
m², ft², acres, hectares, mi², km² free
Ssamurai
POST /conv/area$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 — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.

Balance
$10.00+

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