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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6channels
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The full catalog
Search or filter by category. Every capability is its own endpoint with a published price.
⚙️ Developer UtilitiesFree
Distributive property calculator
expand expressions
F
POST /algebra/distribute-expression$0.002⚙️ Developer UtilitiesFree
Interval notation from inequality calculator
open/closed brackets, free
A
POST /algebra/interval-from-inequality$0.002⚙️ Developer UtilitiesFree
What percent of calculator
find the percentage
K
POST /algebra/is-what-percent-of$0.002⚙️ Developer UtilitiesFree
Midpoint of a segment calculator
halfway point between two endpoints
S
POST /algebra/midpoint-of-segment$0.002⚙️ Developer UtilitiesFree
Solve for x in a ratio calculator
equivalent proportions
F
POST /algebra/ratio-solver$0.002⚙️ Developer UtilitiesFree
Slope from linear equation calculator
solve any line for y
B
POST /algebra/slope-of-line-from-equation$0.002⚙️ Developer UtilitiesFree
Cross multiplication calculator
solve a/b = c/d for the unknown
S
POST /algebra/cross-multiply$0.002⚙️ Developer UtilitiesFree
GCF of monomials calculator
greatest common factor of algebraic terms
P
POST /algebra/gcf-of-terms$0.002⚙️ Developer UtilitiesFree
Aphelion distance from eccentricity calculator
F
POST /astro/aphelion-distance$0.002⚙️ Developer UtilitiesFree
Orbital speed at altitude calculator
circular v from μ, R, and h, free
A
POST /astro/orbital-speed-at-altitude$0.002⚙️ Developer UtilitiesFree
Perihelion velocity calculator
maximum orbital speed at closest approach
B
POST /astro/perihelion-velocity$0.002⚙️ Developer UtilitiesFree
Specific orbital energy from semi-major axis calculator
K
POST /astro/specific-energy-from-sma$0.002⚙️ Developer UtilitiesFree
Apparent magnitude from absolute magnitude and distance calculator
F
POST /astro/apparent-from-absolute$0.002⚙️ Developer UtilitiesFree
Apsis speed ratio calculator
periapsis to apoapsis speed
K
POST /astro/apsis-speed-ratio$0.002⚙️ Developer UtilitiesFree
Combined maneuver Δv calculator
speed change + plane change burn
S
POST /astro/combined-plane-change$0.002⚙️ Developer UtilitiesFree
Escape burn delta-v calculator from a circular orbit
B
POST /astro/escape-burn-deltav$0.002⚙️ Developer UtilitiesFree
Escape velocity at altitude calculator
mass, radius and height
F
POST /astro/escape-velocity-at-altitude$0.002⚙️ Developer UtilitiesFree
Orbital flight path angle calculator
eccentricity and true anomaly
B
POST /astro/flight-path-angle$0.002⚙️ Developer UtilitiesFree
Hohmann Total Delta-V Calculator for Circular Orbits
B
POST /astro/hohmann-deltav-total$0.002⚙️ Developer UtilitiesFree
Hohmann transfer orbit semi-major axis calculator
F
POST /astro/hohmann-transfer-sma$0.002⚙️ Developer UtilitiesFree
Hyperbolic semi-major axis calculator
a=−μ/v∞² from μ, v∞
A
POST /astro/hyperbolic-semimajor$0.002⚙️ Developer UtilitiesFree
Gravity balance point distance calculator between two masses
B
POST /astro/l1-gravity-balance$0.002⚙️ Developer UtilitiesFree
L4 and L5 Lagrange Point Geometry Calculator
K
POST /astro/lagrange-l4-l5-geometry$0.002⚙️ Developer UtilitiesFree
Brightness ratio to magnitude difference calculator
K
POST /astro/ratio-to-magnitude-diff$0.002⚙️ Developer UtilitiesFree
Rocket final mass calculator
dry mass from Δv, ve, and m₀
A
POST /astro/rocket-final-mass$0.002⚙️ Developer UtilitiesFree
Orbital semi-latus rectum calculator
p = a(1−e²) from a and e, free
P
POST /astro/semilatus-rectum$0.002⚙️ Developer UtilitiesFree
Sphere of influence calculator
patched-conic r_SOI = a(m/M)^(2/5)
A
POST /astro/sphere-of-influence$0.002⚙️ Developer UtilitiesFree
Rocket structural coefficient calculator
dry and propellant mass
K
POST /astro/structural-coefficient$0.002⚙️ Developer UtilitiesFree
Rocket thrust from mass flow
F = ṁ·ve in newtons, free
P
POST /astro/thrust-from-mass-flow$0.002⚙️ Developer UtilitiesFree
Rocket thrust-to-weight ratio calculator
thrust, mass and gravity
F
POST /astro/thrust-to-weight$0.002⚙️ Developer UtilitiesFree
Differential tidal force calculator
Δa = 2GML/r³ inverse-cube free
S
POST /astro/tidal-force$0.002⚙️ Developer UtilitiesFree
True anomaly from eccentric anomaly calculator
half-angle formula, free
S
POST /astro/true-anomaly-from-eccentric$0.002⚙️ Developer UtilitiesFree
Blackbody radiant exitance calculator
Stefan-Boltzmann law
F
POST /astro/blackbody-flux$0.002⚙️ Developer UtilitiesFree
Bolometric magnitude calculator
apply a bolometric correction
B
POST /astro/bolometric-magnitude$0.002⚙️ Developer UtilitiesFree
Atmospheric extinction magnitude calculator
magnitudes lost
K
POST /astro/extinction-magnitude$0.002⚙️ Developer UtilitiesFree
Mass ratio from barycenter calculator
m₁/m₂ = r₂/r₁
P
POST /astro/mass-ratio-from-barycenter$0.002⚙️ Developer UtilitiesFree
Proper motion calculator
arcsec/yr from tangential velocity and distance
A
POST /astro/proper-motion-from-velocity$0.002⚙️ Developer UtilitiesFree
Surface brightness calculator
magnitude per square arcsecond
F
POST /astro/surface-brightness$0.002⚙️ Developer UtilitiesFree
Combined magnitude of two stars
total apparent magnitude from flux sum
S
POST /astro/combined-magnitude$0.002⚙️ Developer UtilitiesFree
Planet equilibrium temperature calculator
stellar flux and albedo
B
POST /astro/equilibrium-temperature$0.002⚙️ Developer UtilitiesFree
Main-sequence lifetime calculator
τ ≈ 10¹⁰ · (M/L) years, free
P
POST /astro/main-sequence-lifetime$0.002⚙️ Developer UtilitiesFree
Stellar lifetime energy calculator
total radiant energy in joules
F
POST /astro/stellar-energy-output$0.002⚙️ Developer UtilitiesFree
Stellar flux at planet calculator
luminosity and orbital distance
K
POST /astro/stellar-flux-at-planet$0.002⚙️ Developer UtilitiesFree
Chandrasekhar mass limit calculator
5.83/μe² solar masses
S
POST /astro/chandrasekhar-mass$0.002⚙️ Developer UtilitiesFree
Hubble time calculator
expansion timescale t_H = 1/H0 in years, free
P
POST /astro/hubble-time$0.002⚙️ Developer UtilitiesFree
Simple lookback time calculator
low-redshift estimate
F
POST /astro/lookback-time-lowz$0.002⚙️ Developer UtilitiesFree
Matter density at redshift calculator
rho(z) from present density
K
POST /astro/matter-density-at-z$0.002⚙️ Developer UtilitiesFree
Scale factor from redshift calculator
a = 1/(1 + z)
B
POST /astro/scale-factor-from-redshift$0.002⚙️ Developer UtilitiesFree
Stellar angular diameter calculator
mas from radius and distance
A
POST /astro/stellar-angular-diameter$0.002⚙️ Developer UtilitiesFree
Stellar surface escape velocity calculator
mass and radius
K
POST /astro/stellar-escape-velocity$0.002⚙️ Developer UtilitiesFree
Universe age from Hubble constant
matter-dominated flat age t=(2/3)/H0
A
POST /astro/age-from-hubble$0.002⚙️ Developer UtilitiesFree
Low-redshift luminosity distance calculator
d_L ≈ cz/H0 in Mpc
S
POST /astro/luminosity-distance-lowz$0.002⚙️ Developer UtilitiesFree
Planet mass from surface gravity
M = g·R²/G in kilograms, free
P
POST /astro/mass-from-gravity$0.002⚙️ Developer UtilitiesFree
Moon orbital speed calculator
mean circular-orbit speed
K
POST /astro/moon-orbital-speed$0.002⚙️ Developer UtilitiesFree
Planet mass from density and radius calculator
B
POST /astro/planet-mass-from-density$0.002⚙️ Developer UtilitiesFree
Solar Day Length Calculator
Sidereal Rotation and Orbit
F
POST /astro/solar-day-length$0.002⚙️ Developer UtilitiesFree
Telescope light-gathering power calculator
compare with the human eye
F
POST /astro/light-gathering-power$0.002⚙️ Developer UtilitiesFree
Minimum useful magnification calculator for telescopes
K
POST /astro/min-useful-magnification$0.002⚙️ Developer UtilitiesFree
Moon illuminated fraction calculator
from phase angle, free
S
POST /astro/moon-illumination-fraction$0.002⚙️ Developer UtilitiesFree
Planet year length calculator
orbital year from stellar mass and a
P
POST /astro/planet-year-length$0.002No capabilities match your search.
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.