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
Rayleigh angular resolution calculator
1.22 λ/D
B
POST /astro/rayleigh-resolution$0.002⚙️ Developer UtilitiesFree
Solar declination by day of year
cosine seasonal model, free
A
POST /astro/solar-declination-day$0.002⚙️ Developer UtilitiesFree
Airmass from altitude calculator
secant approximation
F
POST /astro/airmass-from-altitude$0.002⚙️ Developer UtilitiesFree
Aperture from focal ratio calculator
diameter D = f/N in mm, free
A
POST /astro/aperture-from-focal-ratio$0.002⚙️ Developer UtilitiesFree
Focal reducer calculator
effective focal length and f-ratio
P
POST /astro/focal-reducer$0.002⚙️ Developer UtilitiesFree
Image scale calculator
arcsec/pixel from pixel size & focal length
S
POST /astro/image-scale-pixel$0.002⚙️ Developer UtilitiesFree
Modified Julian Date calculator
MJD from Julian Date, free
A
POST /astro/modified-julian-date$0.002⚙️ Developer UtilitiesFree
Sidereal drift rate calculator
star motion by declination
K
POST /astro/sidereal-drift-rate$0.002⚙️ Developer UtilitiesFree
Days since J2000 epoch calculator
JD minus 2451545.0
S
POST /astro/days-since-j2000$0.002⚙️ Developer UtilitiesFree
Declination from horizontal coords
altitude, azimuth, latitude
P
POST /astro/declination-horizontal$0.002⚙️ Developer UtilitiesFree
Hour angle from LST and right ascension calculator
B
POST /astro/hour-angle-from-lst$0.002⚙️ Developer UtilitiesFree
Precession of declination calculator
annual Δδ from n·cos(α)
A
POST /astro/precession-dec$0.002⚙️ Developer UtilitiesFree
Right Ascension from Ecliptic Coordinates Calculator
K
POST /astro/ra-from-ecliptic$0.002⚙️ Developer UtilitiesFree
Transit altitude from declination calculator
F
POST /astro/transit-altitude$0.002⚙️ Developer UtilitiesFree
Black hole event horizon area calculator
Schwarzschild formula
K
POST /astro/event-horizon-area$0.002⚙️ Developer UtilitiesFree
Orbital period in days calculator
Kepler T from AU and solar masses
S
POST /astro/orbital-period-days$0.002⚙️ Developer UtilitiesFree
Photon sphere radius calculator
from black hole mass
F
POST /astro/photon-sphere-radius$0.002⚙️ Developer UtilitiesFree
Binary Roche lobe radius calculator
Eggleton approximation
F
POST /astro/roche-radius-binary$0.002⚙️ Developer UtilitiesFree
Hohmann departure speed calculator
periapsis from radii and μ
A
POST /astro/transfer-departure-speed$0.002⚙️ Developer UtilitiesFree
Bond albedo from reflected flux calculator
reflected to incident ratio
K
POST /astro/albedo-from-flux$0.002⚙️ Developer UtilitiesFree
Escape to circular speed ratio calculator
v_esc = √2 · v_circ
P
POST /astro/escape-to-circular-ratio$0.002⚙️ Developer UtilitiesFree
J2 nodal precession rate calculator for satellite orbits
B
POST /astro/nodal-regression-rate$0.002⚙️ Developer UtilitiesFree
Relativistic perihelion precession calculator
GR arcsec per orbit
A
POST /astro/relativistic-perihelion-shift$0.002⚙️ Developer UtilitiesFree
Exoplanet transit duration calculator
central transit hours from P, R★, a
S
POST /astro/transit-duration$0.002⚙️ Developer UtilitiesFree
Subtract weeks from a date
exact date calculator
B
POST /date/subtract-weeks$0.002⚙️ Developer UtilitiesFree
Orbit total energy calculator
mass, mu, and semi-major axis
F
POST /astro/orbital-energy-total$0.002⚙️ Developer UtilitiesFree
Add decades to a date
ISO ± N ten-year decades, free
P
POST /date/add-decades$0.002⚙️ Developer UtilitiesFree
Add hours to a datetime
ISO clock shift in UTC, free
S
POST /date/add-hours$0.002⚙️ Developer UtilitiesFree
Difference in decades between dates
whole decade calculator
B
POST /date/diff-in-decades$0.002⚙️ Developer UtilitiesFree
Difference in minutes between two datetimes
signed UTC, free
A
POST /date/diff-in-minutes$0.002⚙️ Developer UtilitiesFree
Subtract minutes from a datetime
UTC calculator
K
POST /date/subtract-minutes$0.002⚙️ Developer UtilitiesFree
Days remaining in the quarter
calendar day counter
B
POST /date/days-remaining-quarter$0.002⚙️ Developer UtilitiesFree
Midpoint between two dates
exact halfway datetime in UTC, free
P
POST /date/midpoint-between-dates$0.002⚙️ Developer UtilitiesFree
Nearest weekday to a date
snap weekends to Mon–Fri business day, free
S
POST /date/nearest-weekday$0.002⚙️ Developer UtilitiesFree
Net working days between dates
weekends and holidays excluded
F
POST /date/net-workdays-between$0.002⚙️ Developer UtilitiesFree
Working days in a year
exclude weekends and holidays
K
POST /date/workdays-in-year$0.002⚙️ Developer UtilitiesFree
Business days until a date
exclude weekends and holidays
F
POST /date/business-days-until-date$0.002⚙️ Developer UtilitiesFree
Start and end of century
first and last year from an ISO date, free
P
POST /date/century-start-end$0.002⚙️ Developer UtilitiesFree
Fraction of quarter elapsed
ISO datetime to 0–1 quarter progress
A
POST /date/fraction-of-quarter-elapsed$0.002⚙️ Developer UtilitiesFree
Start and end of ISO week
Monday and Sunday dates from any day, free
S
POST /date/iso-week-start-end$0.002⚙️ Developer UtilitiesFree
Start of next year
get January 1 from an ISO date
B
POST /date/start-of-next-year$0.002⚙️ Developer UtilitiesFree
Weeks until a future date
exact whole and fractional weeks
K
POST /date/weeks-until-date$0.002⚙️ Developer UtilitiesFree
Ascension Day date calculator
39 days after Easter
B
POST /date/ascension-day$0.002⚙️ Developer UtilitiesFree
Count a specific weekday in a year from an ISO date
F
POST /date/count-weekday-in-year$0.002⚙️ Developer UtilitiesFree
Day number within quarter
one-based day of Q1–Q4 from ISO date
A
POST /date/day-number-in-quarter$0.002⚙️ Developer UtilitiesFree
Convert .NET ticks to an ISO date and time
K
POST /date/dotnet-ticks-to-date$0.002⚙️ Developer UtilitiesFree
Gregorian epact calculator
moon age on January 1, free
A
POST /date/epact-gregorian$0.002⚙️ Developer UtilitiesFree
Excel serial number to date
1900 system converter with leap bug, free
P
POST /date/excel-serial-to-date$0.002⚙️ Developer UtilitiesFree
Floor datetime to a minute or second interval in UTC
K
POST /date/floor-to-interval$0.002⚙️ Developer UtilitiesFree
Gregorian to Ethiopian date converter
free calendar tool
A
POST /date/gregorian-to-ethiopian$0.002⚙️ Developer UtilitiesFree
Gregorian to Hebrew date converter
deterministic calendar arithmetic
F
POST /date/gregorian-to-hebrew$0.002⚙️ Developer UtilitiesFree
Gregorian to Hijri date converter
tabular Islamic calendar, free
S
POST /date/gregorian-to-hijri$0.002⚙️ Developer UtilitiesFree
Gregorian to Julian calendar date converter
F
POST /date/gregorian-to-julian-cal$0.002⚙️ Developer UtilitiesFree
Gregorian to Indian Saka calendar converter
free ISO date tool
P
POST /date/gregorian-to-saka$0.002⚙️ Developer UtilitiesFree
Hijri year length calculator
354 or 355 days
B
POST /date/hijri-year-length$0.002⚙️ Developer UtilitiesFree
Is a weekend day?
Saturday/Sunday checker for an ISO date
A
POST /date/is-weekend$0.002⚙️ Developer UtilitiesFree
Japanese nengo era year calculator
Reiwa, Heisei, Showa from ISO date
S
POST /date/japanese-nengo-year$0.002⚙️ Developer UtilitiesFree
List all of a weekday in a month
every Monday–Sunday date, free
P
POST /date/list-weekday-dates-month$0.002⚙️ Developer UtilitiesFree
Maya Calendar Round Calculator for Any Date
K
POST /date/maya-calendar-round$0.002⚙️ Developer UtilitiesFree
Maya Long Count from date
free converter
F
POST /date/maya-long-count$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
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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+
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