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
Specific Acoustic Impedance Calculator
Density × Sound Speed
K
POST /optics/specific-acoustic-impedance$0.002⚙️ Developer UtilitiesFree
Average Absorption Coefficient Calculator for Rooms
B
POST /optics/average-absorption-coefficient$0.002⚙️ Developer UtilitiesFree
Doppler effect with wind
observed frequency via effective sound speed
A
POST /optics/doppler-with-wind$0.002⚙️ Developer UtilitiesFree
Mass law transmission loss
sound TL from surface mass & frequency
S
POST /optics/mass-law-transmission-loss$0.002⚙️ Developer UtilitiesFree
MIDI note to frequency calculator
Hz from MIDI number (A4=440)
P
POST /optics/midi-note-to-frequency$0.002⚙️ Developer UtilitiesFree
Schroeder frequency calculator
room modes and diffuse field
K
POST /optics/schroeder-frequency$0.002⚙️ Developer UtilitiesFree
Semitones between frequencies calculator
equal temperament interval
F
POST /optics/semitones-between-frequencies$0.002⚙️ Developer UtilitiesFree
Ultrasound Doppler frequency shift calculator
reflected wave
F
POST /optics/ultrasound-doppler-shift$0.002⚙️ Developer UtilitiesFree
Combined focal length of lenses in contact calculator
B
POST /optics/combined-focal-lenses-contact$0.002⚙️ Developer UtilitiesFree
Focal length from lens radii
thin lens f from n, R1, R2
A
POST /optics/focal-length-from-radii$0.002⚙️ Developer UtilitiesFree
Helmholtz resonator volume calculator
V from f, A, L, c
P
POST /optics/helmholtz-resonator-volume$0.002⚙️ Developer UtilitiesFree
Object distance thin lens calculator
do from f and di, free
S
POST /optics/object-distance-thin-lens$0.002⚙️ Developer UtilitiesFree
Object height from magnification calculator
ho = hi / m
F
POST /optics/object-height-from-magnification$0.002⚙️ Developer UtilitiesFree
Pythagorean tuning frequency
pure fifths from a reference pitch
A
POST /optics/pythagorean-tuning-frequency$0.002⚙️ Developer UtilitiesFree
Sound level exponential decay calculator
SPL after time
K
POST /optics/sound-level-exponential-decay$0.002⚙️ Developer UtilitiesFree
Wavelength of a musical note calculator
frequency to length
B
POST /optics/wavelength-of-musical-note$0.002⚙️ Developer UtilitiesFree
Compound microscope magnification calculator
total M from L, f_o, f_e
S
POST /optics/compound-microscope-magnification$0.002⚙️ Developer UtilitiesFree
Lens focal length in a medium calculator
K
POST /optics/lens-focal-length-in-medium$0.002⚙️ Developer UtilitiesFree
Mirror focal length from radius
f = R/2 for spherical mirrors
A
POST /optics/mirror-focal-from-radius$0.002⚙️ Developer UtilitiesFree
Spherical mirror image height calculator
height from magnification
B
POST /optics/mirror-image-height$0.002⚙️ Developer UtilitiesFree
Telescope objective focal length calculator
target magnification
F
POST /optics/telescope-objective-focal$0.002⚙️ Developer UtilitiesFree
Telescope true field of view calculator
TFOV = AFOV / M
P
POST /optics/telescope-true-field-of-view$0.002⚙️ Developer UtilitiesFree
Abbe number calculator from refractive indices
F
POST /optics/abbe-number$0.002⚙️ Developer UtilitiesFree
Camera angle of view calculator
sensor size and focal length
F
POST /optics/camera-angle-of-view$0.002⚙️ Developer UtilitiesFree
Diffraction-limited spot size
Airy diameter (λ, f-number)
S
POST /optics/diffraction-limited-spot-size$0.002⚙️ Developer UtilitiesFree
Prism angle of deviation calculator
incidence, emergence and apex angle
K
POST /optics/prism-angle-of-deviation$0.002⚙️ Developer UtilitiesFree
Refractive index from speed of light
n = c/v calculator, free
P
POST /optics/refractive-index-from-speed$0.002⚙️ Developer UtilitiesFree
Total internal reflection critical angle calculator
B
POST /optics/total-internal-reflection-angle$0.002⚙️ Developer UtilitiesFree
Fresnel reflection at normal incidence
R from n₁, n₂, free
S
POST /optics/fresnel-reflection-normal$0.002⚙️ Developer UtilitiesFree
Grating resolving power calculator
order times illuminated lines
F
POST /optics/grating-resolving-power$0.002⚙️ Developer UtilitiesFree
Grating wavelength from angle calculator
K
POST /optics/grating-wavelength-from-angle$0.002⚙️ Developer UtilitiesFree
Single-slit diffraction minima angle
θ from m, λ and a
P
POST /optics/single-slit-minima-angle$0.002⚙️ Developer UtilitiesFree
Thin prism deviation calculator
δ = (n − 1)A, free
A
POST /optics/thin-prism-deviation$0.002⚙️ Developer UtilitiesFree
Wavelength from double-slit fringes calculator
B
POST /optics/wavelength-from-double-slit$0.002⚙️ Developer UtilitiesFree
Anti-reflection coating thickness calculator
quarter-wave t = λ/(4n)
A
POST /optics/antireflection-coating-thickness$0.002⚙️ Developer UtilitiesFree
Fresnel number calculator
aperture, distance and wavelength
F
POST /optics/fresnel-number$0.002⚙️ Developer UtilitiesFree
Michelson interferometer mirror displacement
ΔL = Nλ/2 from fringes
P
POST /optics/michelson-mirror-displacement$0.002⚙️ Developer UtilitiesFree
Newton's rings lens radius of curvature
R from ring radius, order, λ
S
POST /optics/newtons-rings-lens-radius$0.002⚙️ Developer UtilitiesFree
Photoelectric Threshold Wavelength Calculator
K
POST /optics/photoelectric-threshold-wavelength$0.002⚙️ Developer UtilitiesFree
Photon Flux from Power Calculator
Photons per Second
B
POST /optics/photon-flux-from-power$0.002⚙️ Developer UtilitiesFree
Unpolarized light through polarizer calculator
B
POST /optics/unpolarized-through-polarizer$0.002⚙️ Developer UtilitiesFree
Wavelength from photon energy
λ = hc/E calculator
S
POST /optics/wavelength-from-photon-energy$0.002⚙️ Developer UtilitiesFree
Exposure value from aperture and shutter calculator
B
POST /optics/exposure-value-from-settings$0.002⚙️ Developer UtilitiesFree
Illuminance from luminous intensity
E = I / r² lux calculator, free
P
POST /optics/illuminance-from-intensity$0.002⚙️ Developer UtilitiesFree
ISO stops difference calculator
compare camera sensitivity
F
POST /optics/iso-stops-difference$0.002⚙️ Developer UtilitiesFree
Luminous efficacy calculator
lumens per watt from light output and power
K
POST /optics/luminous-efficacy$0.002⚙️ Developer UtilitiesFree
Shutter speed from exposure value
t from EV and f-number
S
POST /optics/shutter-speed-from-ev$0.002⚙️ Developer UtilitiesFree
Temperature from radiated power
inverted Stefan–Boltzmann T from P, A, ε
A
POST /optics/temperature-from-radiated-power$0.002⚙️ Developer UtilitiesFree
Wien displacement law calculator
blackbody peak wavelength
F
POST /optics/wien-peak-wavelength$0.002⚙️ Developer UtilitiesFree
Fiber material dispersion calculator
pulse broadening from D, Δλ, L
S
POST /optics/fiber-material-dispersion$0.002⚙️ Developer UtilitiesFree
Fiber relative refractive index difference
Δ core/cladding
P
POST /optics/fiber-relative-index-difference$0.002⚙️ Developer UtilitiesFree
Fiber total loss calculator
attenuation over link length
K
POST /optics/fiber-total-loss$0.002⚙️ Developer UtilitiesFree
Flash distance from guide number
distance = GN ÷ f-number
A
POST /optics/flash-distance-from-guide-number$0.002⚙️ Developer UtilitiesFree
Optical path length calculator
refractive index × distance
F
POST /optics/optical-path-length$0.002⚙️ Developer UtilitiesFree
Single-mode fiber cutoff wavelength calculator
B
POST /optics/single-mode-cutoff-wavelength$0.002⚙️ Developer UtilitiesFree
Optical etendue calculator
source area and solid angle
B
POST /optics/etendue$0.002⚙️ Developer UtilitiesFree
IQR outlier detection calculator
flag values beyond 1.5 IQR
B
POST /stat/iqr-outlier-detection$0.002⚙️ Developer UtilitiesFree
Median absolute deviation calculator
Find MAD online
K
POST /stat/median-absolute-deviation$0.002⚙️ Developer UtilitiesFree
Mode of a dataset calculator
most frequent value(s), free
P
POST /stat/mode-value$0.002⚙️ Developer UtilitiesFree
Population variance calculator
divide squared deviations by N
K
POST /stat/population-variance$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.
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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+
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