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
Relative velocity 2D calculator
magnitude and direction of v1−v2
A
POST /mech/relative-velocity-2d$0.002⚙️ Developer UtilitiesFree
Torricelli equation calculator
v² = u² + 2as final speed
S
POST /mech/torricelli-equation$0.002⚙️ Developer UtilitiesFree
Vertical throw flight time calculator
calculate 2v/g
F
POST /mech/vertical-throw-flight-time$0.002⚙️ Developer UtilitiesFree
General form equation of a circle
from center and radius
G
POST /math/general-form-equation-circle$0.002⚙️ Developer UtilitiesFree
General to standard form of a circle
center and radius from coefficients
H
POST /math/general-to-standard-form-circle$0.002⚙️ Developer UtilitiesFree
Rectangle calculator
area and perimeter from length and width
G
POST /math/generic-rectangle$0.002⚙️ Developer UtilitiesFree
Angle of repose calculator
θ = arctan(μₛ) from static friction
A
POST /mech/angle-of-repose$0.002⚙️ Developer UtilitiesFree
Force resolution calculator
horizontal and vertical components
F
POST /mech/force-components$0.002⚙️ Developer UtilitiesFree
Incline friction to prevent sliding calculator
K
POST /mech/incline-friction-needed$0.002⚙️ Developer UtilitiesFree
Mean velocity under uniform acceleration
(vi + vf) / 2 free
S
POST /mech/mean-velocity-uniform-acceleration$0.002⚙️ Developer UtilitiesFree
Projectile range on an incline calculator
uphill or downhill
F
POST /mech/projectile-on-incline-range$0.002⚙️ Developer UtilitiesFree
Complementary angle range calculator
equal range from two launch angles
P
POST /mech/projectile-range-two-angles$0.002⚙️ Developer UtilitiesFree
Tension in accelerating cord calculator
two masses, force F
S
POST /mech/tension-accelerating-rope$0.002⚙️ Developer UtilitiesFree
Two-rope tension calculator
solve tension from weight and angles
B
POST /mech/tension-two-ropes-angle$0.002⚙️ Developer UtilitiesFree
Golden ratio calculator
split a segment into its golden-ratio parts
H
POST /math/golden-ratio$0.002⚙️ Developer UtilitiesFree
Gradient calculator
slope of the line through two points
G
POST /math/gradient$0.002⚙️ Developer UtilitiesFree
Centrifuge g-force calculator
convert rotor radius and RPM to RCF
F
POST /mech/centrifuge-g-force$0.002⚙️ Developer UtilitiesFree
Kinetic energy ratio calculator
compare energy at two speeds
F
POST /mech/kinetic-energy-ratio$0.002⚙️ Developer UtilitiesFree
Max speed on flat curve calculator
v = √(μ g r) from friction and radius
A
POST /mech/max-speed-flat-curve$0.002⚙️ Developer UtilitiesFree
Output power from efficiency calculator
watts from input power
B
POST /mech/output-power-efficiency$0.002⚙️ Developer UtilitiesFree
Pendulum speed at the bottom calculator
K
POST /mech/pendulum-speed-bottom$0.002⚙️ Developer UtilitiesFree
Screw jack mechanical advantage calculator
MA from lever arm and pitch
P
POST /mech/screw-mechanical-advantage$0.002⚙️ Developer UtilitiesFree
Maximum static friction calculator
find the force before sliding
B
POST /mech/static-friction-max$0.002⚙️ Developer UtilitiesFree
Work-energy theorem calculator
net work from ΔKE free
S
POST /mech/work-energy-theorem$0.002⚙️ Developer UtilitiesFree
Gram-Schmidt calculator
orthonormal basis from independent vectors
H
POST /math/gram-schmidt$0.002⚙️ Developer UtilitiesFree
Graph linear inequalities on a number line
interval and shading
G
POST /math/graphing-inequalities-1d$0.002⚙️ Developer UtilitiesFree
Angular displacement calculator
θ = ω₀t + ½αt², free
P
POST /mech/angular-displacement$0.002⚙️ Developer UtilitiesFree
1D momentum conservation calculator
solve final velocity
K
POST /mech/conservation-momentum-1d$0.002⚙️ Developer UtilitiesFree
Explosion fragment velocity calculator
find the second fragment speed
B
POST /mech/explosion-two-fragments$0.002⚙️ Developer UtilitiesFree
Impulse on bouncing ball calculator
floor impulse from mass and speeds
A
POST /mech/impulse-bouncing-ball$0.002⚙️ Developer UtilitiesFree
Point Mass Moment of Inertia Calculator
I = mr²
K
POST /mech/moment-of-inertia-point-mass$0.002⚙️ Developer UtilitiesFree
Ring moment of inertia calculator
I = m r² for a thin hoop, free
S
POST /mech/moment-of-inertia-ring$0.002⚙️ Developer UtilitiesFree
Newton's cradle calculator
outgoing balls and speed
F
POST /mech/newtons-cradle$0.002⚙️ Developer UtilitiesFree
Parallel axis theorem calculator
find I with I_c + md²
B
POST /mech/parallel-axis-theorem$0.002⚙️ Developer UtilitiesFree
Power to overcome drag calculator
P = F_d × v at steady speed
P
POST /mech/power-to-overcome-drag$0.002⚙️ Developer UtilitiesFree
Rolling down incline calculator
acceleration with inertia
F
POST /mech/rolling-down-incline-acceleration$0.002⚙️ Developer UtilitiesFree
Rotational work calculator
W=τθ in joules free
A
POST /mech/rotational-work$0.002⚙️ Developer UtilitiesFree
Spring launch speed calculator
v from k, compression, and mass
S
POST /mech/spring-launch-speed$0.002⚙️ Developer UtilitiesFree
Graphing quadratic inequalities
boundary roots and shaded solution region
H
POST /math/graphing-quadratic-inequalities$0.002⚙️ Developer UtilitiesFree
Belt and pulley speed calculator
find driven pulley RPM
B
POST /mech/belt-speed$0.002⚙️ Developer UtilitiesFree
Orbit total energy calculator
circular satellite energy
K
POST /mech/circular-orbit-energy-total$0.002⚙️ Developer UtilitiesFree
Orbital angular momentum calculator
specific h from r, v, and path angle
B
POST /mech/orbital-angular-momentum$0.002⚙️ Developer UtilitiesFree
Specific orbital energy calculator
ε = −μ/(2a) free
S
POST /mech/specific-orbital-energy$0.002⚙️ Developer UtilitiesFree
Surface gravity from density calculator
g = (4/3)πGρr free
A
POST /mech/surface-gravity-from-density$0.002⚙️ Developer UtilitiesFree
Gravitational binding energy two masses calculator
U = −Gm₁m₂/r free
S
POST /mech/two-mass-gravitational-pe$0.002⚙️ Developer UtilitiesFree
First-class lever calculator
find the required effort force
K
POST /mech/lever-first-class$0.002⚙️ Developer UtilitiesFree
Friction for rolling without slipping
μ_min from angle and inertia factor
P
POST /mech/rolling-friction-needed$0.002⚙️ Developer UtilitiesFree
Seconds pendulum length calculator
two-second period from gravity
B
POST /mech/seconds-pendulum$0.002⚙️ Developer UtilitiesFree
SHM displacement calculator
amplitude, frequency and phase
K
POST /mech/shm-displacement$0.002⚙️ Developer UtilitiesFree
SHM total energy calculator
E = ½kA² for mass-spring oscillators
A
POST /mech/shm-total-energy$0.002⚙️ Developer UtilitiesFree
Force to Tip an Object Calculator
B
POST /mech/toppling-force$0.002⚙️ Developer UtilitiesFree
Vertical spring stretch calculator
δ = mg/k for a hanging mass
S
POST /mech/vertical-spring-stretch$0.002⚙️ Developer UtilitiesFree
Apparent weight in fluid calculator
subtract buoyant force
K
POST /mech/apparent-weight-submerged$0.002⚙️ Developer UtilitiesFree
G-force calculator
convert acceleration to standard gravity
K
POST /mech/g-force-acceleration$0.002⚙️ Developer UtilitiesFree
Ladder equilibrium calculator
min friction and reactions
P
POST /mech/ladder-against-wall$0.002⚙️ Developer UtilitiesFree
Moment of a force calculator
M = F × d in newton-metres
A
POST /mech/moment-of-force$0.002⚙️ Developer UtilitiesFree
Pulley system effort calculator
force to lift a block and tackle load
S
POST /mech/pulley-system-effort$0.002⚙️ Developer UtilitiesFree
Stokes drag force calculator
F = 6πηrv for a sphere in viscous fluid
S
POST /mech/stokes-drag$0.002⚙️ Developer UtilitiesFree
Weight at latitude calculator
Earth rotation, free
P
POST /mech/weight-at-latitude$0.002⚙️ Developer UtilitiesFree
All primitive roots modulo n
complete generator list
B
POST /numth/all-primitive-roots$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
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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.