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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7554ready-made tools
6channels
1API & key
$0.002per call, from
The full catalog
Search or filter by category. Every capability is its own endpoint with a published price.
⚙️ Developer UtilitiesFree
Cylinder circumference
circular base perimeter from radius or diameter
H
POST /math/cylinder-circumference$0.002⚙️ Developer UtilitiesFree
Slope angle to grade percentage calculator
B
POST /geo/angle-to-grade$0.002⚙️ Developer UtilitiesFree
Contour interval from map scale and terrain relief
B
POST /geo/contour-interval$0.002⚙️ Developer UtilitiesFree
Terrain line of sight calculator
clear LOS over a height profile
A
POST /geo/line-of-sight$0.002⚙️ Developer UtilitiesFree
Net elevation change
total gain and loss along a profile
S
POST /geo/net-elevation-change$0.002⚙️ Developer UtilitiesFree
Atmospheric refraction correction calculator for surveying
F
POST /geo/refraction-correction$0.002⚙️ Developer UtilitiesFree
Slope degrees between two points
elevation angle calculator
K
POST /geo/slope-degrees-two-points$0.002⚙️ Developer UtilitiesFree
Mutual visibility range
max line-of-sight from two heights, free
P
POST /geo/target-visibility-range$0.002⚙️ Developer UtilitiesFree
Cylinder diameter calculator
from volume and height, free online
G
POST /math/cylinder-diameter$0.002⚙️ Developer UtilitiesFree
Cylinder volume in gallons
from radius and height in inches
H
POST /math/cylinder-volume-gallons$0.002⚙️ Developer UtilitiesFree
Cylinder volume in liters
from radius and height in centimeters
H
POST /math/cylinder-volume-liters$0.002⚙️ Developer UtilitiesFree
Buffer radius bounding box calculator for latitude and longitude
B
POST /geo/buffer-bbox$0.002⚙️ Developer UtilitiesFree
Point distance matrix
pairwise great-circle distances
K
POST /geo/distance-matrix$0.002⚙️ Developer UtilitiesFree
K nearest neighbor points
great-circle distance lookup
F
POST /geo/k-nearest-neighbors$0.002⚙️ Developer UtilitiesFree
Mean center of points
spherical average of lat/lon free
A
POST /geo/mean-center$0.002⚙️ Developer UtilitiesFree
Standard distance of points
spatial std. dev. around mean center
P
POST /geo/standard-distance$0.002⚙️ Developer UtilitiesFree
Switchback count estimate
climb elevation within a max grade
S
POST /geo/switchback-count$0.002⚙️ Developer UtilitiesFree
Cylindrical coordinates converter
radius, azimuth and height
G
POST /math/cylindrical-coordinates$0.002⚙️ Developer UtilitiesFree
Regular decagon
area, perimeter, interior angle and diagonal count
H
POST /math/decagon$0.002⚙️ Developer UtilitiesFree
Authalic latitude calculator
geodetic to equal-area latitude
F
POST /geo/authalic-latitude$0.002⚙️ Developer UtilitiesFree
Bounding box contains check
does one AABB fully contain another?
A
POST /geo/bbox-contains-bbox$0.002⚙️ Developer UtilitiesFree
Bounding box union
smallest box containing two bboxes, free
S
POST /geo/bbox-union$0.002⚙️ Developer UtilitiesFree
Concave hull approximation from point coordinates
B
POST /geo/concave-hull-approx$0.002⚙️ Developer UtilitiesFree
Round coordinate precision
lat/lon decimal places for privacy or storage
P
POST /geo/coordinate-round$0.002⚙️ Developer UtilitiesFree
Circular geofence check
point inside radius and margin distance
F
POST /geo/geofence-circle-check$0.002⚙️ Developer UtilitiesFree
Grid-based point clustering
count coordinates by cell
K
POST /geo/point-cluster-grid$0.002⚙️ Developer UtilitiesFree
Rectifying latitude calculator
geodetic φ to μ (meridian arc)
S
POST /geo/rectifying-latitude$0.002⚙️ Developer UtilitiesFree
Decimal expansion of a fraction
with repeating part
G
POST /math/decimal$0.002⚙️ Developer UtilitiesFree
Decimal to degrees and minutes converter
whole degrees + minutes
H
POST /math/decimal-to-minutes-degrees$0.002⚙️ Developer UtilitiesFree
Behrmann Equal-Area Projection Calculator
B
POST /geo/behrmann-projection$0.002⚙️ Developer UtilitiesFree
32-point compass to bearing
rose name to degrees, free
P
POST /geo/cardinal32-to-bearing$0.002⚙️ Developer UtilitiesFree
Equidistant conic projection
lat/lon to X/Y, free
S
POST /geo/equidistant-conic$0.002⚙️ Developer UtilitiesFree
Great-circle maximum latitude calculator using Clairaut's relation
K
POST /geo/great-circle-max-latitude$0.002⚙️ Developer UtilitiesFree
Polygon bounding box calculator
latitude and longitude bounds
F
POST /geo/polygon-bounding-box$0.002⚙️ Developer UtilitiesFree
Meridian radius of curvature
WGS84 M(φ) at geodetic latitude
A
POST /geo/radius-meridian-curvature$0.002⚙️ Developer UtilitiesFree
Rhumb line midpoint calculator
find the loxodrome halfway point
B
POST /geo/rhumb-midpoint$0.002⚙️ Developer UtilitiesFree
Determinant calculator
det(A) of a square matrix, free online
G
POST /math/determinant$0.002⚙️ Developer UtilitiesFree
Distance off by two bearings
coastal navigation distance off landmark
A
POST /geo/distance-off-two-bearings$0.002⚙️ Developer UtilitiesFree
Diagonal of a rectangle
instant length from width and height
G
POST /math/diagonal-of-rectangle$0.002⚙️ Developer UtilitiesFree
Diagonalize a matrix
eigenvalues and change-of-basis P, free
H
POST /math/diagonalize-matrix$0.002⚙️ Developer UtilitiesFree
Phase difference to path difference calculator
radians and wavelength
K
POST /optics/phase-to-path-difference$0.002⚙️ Developer UtilitiesFree
String wave average power calculator
P = ½ μ v ω² A²
S
POST /optics/string-wave-average-power$0.002⚙️ Developer UtilitiesFree
Wave intensity inverse square law calculator
B
POST /optics/wave-intensity-inverse-square$0.002⚙️ Developer UtilitiesFree
Angular wave number calculator
k = 2π/λ from wavelength (m)
P
POST /optics/wave-number-from-wavelength$0.002⚙️ Developer UtilitiesFree
Wave phase value calculator
instantaneous phase in radians
F
POST /optics/wave-phase-value$0.002⚙️ Developer UtilitiesFree
Diameter of cone
base diameter from volume and height online
H
POST /math/diameter-of-cone$0.002⚙️ Developer UtilitiesFree
Closed pipe fundamental frequency calculator
F
POST /optics/closed-pipe-fundamental$0.002⚙️ Developer UtilitiesFree
Group velocity calculator
vg ≈ Δω/Δk from two (k, ω) points
P
POST /optics/group-velocity-finite-difference$0.002⚙️ Developer UtilitiesFree
Shallow water wave speed calculator
c = sqrt(g h)
F
POST /optics/shallow-water-wave-speed$0.002⚙️ Developer UtilitiesFree
Standing wave antinodes count calculator
nth harmonic fixed-fixed string
S
POST /optics/standing-wave-antinodes-count$0.002⚙️ Developer UtilitiesFree
String linear density from frequency calculator
μ = T/(2Lf)²
K
POST /optics/string-linear-density-from-frequency$0.002⚙️ Developer UtilitiesFree
String nth harmonic frequency
from wave speed and length
B
POST /optics/string-nth-harmonic-frequency$0.002⚙️ Developer UtilitiesFree
Wave amplitude reflection coefficient calculator
R from Z1 and Z2 free
A
POST /optics/wave-reflection-coefficient$0.002⚙️ Developer UtilitiesFree
Pipe end correction calculator
acoustic ΔL ≈ 0.6·r from tube radius
P
POST /optics/pipe-end-correction$0.002⚙️ Developer UtilitiesFree
Resonance tube speed of sound calculator
consecutive lengths
B
POST /optics/resonance-tube-speed-of-sound$0.002⚙️ Developer UtilitiesFree
Speed from Mach number calculator
actual speed = M × local speed of sound
A
POST /optics/speed-from-mach-number$0.002⚙️ Developer UtilitiesFree
Speed of sound in ideal gas calculator
γ, temperature and molar mass
K
POST /optics/speed-of-sound-ideal-gas$0.002⚙️ Developer UtilitiesFree
String frequency after tension change
f₂ = f₁√(T₂/T₁)
S
POST /optics/string-frequency-from-tension-change$0.002⚙️ Developer UtilitiesFree
Distance for target sound level
inverse-square range from dB, free
P
POST /optics/distance-for-target-sound-level$0.002⚙️ Developer UtilitiesFree
Sound power from power level calculator
watts from Lw (dB re 1 pW)
S
POST /optics/sound-power-from-power-level$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.