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
CMB Temperature at Redshift Calculator
T(z) = T0(1 + z)
B
POST /astro/cmb-temperature-at-z$0.002⚙️ Developer UtilitiesFree
Critical density of the universe calculator
from the Hubble constant
K
POST /astro/critical-density$0.002⚙️ Developer UtilitiesFree
Photon Flux from Luminosity Calculator
Photons per Second
B
POST /astro/photon-flux-from-power$0.002⚙️ Developer UtilitiesFree
Central mass from moon orbit calculator
Kepler's third law
K
POST /astro/central-mass-from-moon$0.002⚙️ Developer UtilitiesFree
Hubble constant from velocity and distance calculator
K
POST /astro/hubble-constant-from-velocity$0.002⚙️ Developer UtilitiesFree
Focal ratio and f-number calculator from focal length and aperture
B
POST /astro/focal-ratio$0.002⚙️ Developer UtilitiesFree
Seasonal Solar Declination Range Calculator
K
POST /astro/planet-axial-tilt-season$0.002⚙️ Developer UtilitiesFree
Planet orbital speed around a star calculator
B
POST /astro/planet-orbital-speed$0.002⚙️ Developer UtilitiesFree
True field of view calculator
telescope eyepiece degrees
K
POST /astro/true-field-of-view$0.002⚙️ Developer UtilitiesFree
Julian Date to Gregorian date and time calculator
B
POST /astro/datetime-from-julian-date$0.002⚙️ Developer UtilitiesFree
Pixel Sampling and Resolution Check Calculator
B
POST /astro/pixel-sampling$0.002⚙️ Developer UtilitiesFree
Star trail length calculator
exposure time and declination
K
POST /astro/star-trail-length$0.002⚙️ Developer UtilitiesFree
Azimuth from equatorial coordinates calculator
K
POST /astro/azimuth-equatorial$0.002⚙️ Developer UtilitiesFree
Day of year calculator from a calendar date
K
POST /astro/day-of-year$0.002⚙️ Developer UtilitiesFree
Equation of time approximation calculator
solar time offset
B
POST /astro/equation-of-time$0.002⚙️ Developer UtilitiesFree
Orbital radius from period in days calculator
semi-major axis in AU
B
POST /astro/orbital-radius-from-period-days$0.002⚙️ Developer UtilitiesFree
Black hole evaporation time calculator
Hawking lifetime
K
POST /astro/black-hole-lifetime$0.002⚙️ Developer UtilitiesFree
Orbital altitude from period and body calculator
B
POST /astro/orbital-altitude-from-period$0.002⚙️ Developer UtilitiesFree
Orbital speed in kilometres per second calculator
K
POST /astro/orbital-velocity-kms$0.002⚙️ Developer UtilitiesFree
Reflected-Light Planet Apparent Magnitude Calculator
B
POST /astro/apparent-magnitude-planet$0.002⚙️ Developer UtilitiesFree
Stellar luminosity in solar units calculator
K
POST /astro/stellar-number-density$0.002⚙️ Developer UtilitiesFree
Add minutes to a datetime
deterministic ISO UTC calculator
B
POST /date/add-minutes$0.002⚙️ Developer UtilitiesFree
Add quarters to a date
three-month date calculator with clamping
K
POST /date/add-quarters$0.002⚙️ Developer UtilitiesFree
Date difference in years, months and days
exact calendar breakdown
B
POST /date/diff-breakdown-ymd$0.002⚙️ Developer UtilitiesFree
Working days remaining in month
exclude weekends and holidays
K
POST /date/workdays-remaining-month$0.002⚙️ Developer UtilitiesFree
Days remaining in the month
calculate days until month end
K
POST /date/days-remaining-month$0.002⚙️ Developer UtilitiesFree
Start and end of decade
find first and last year from a date
K
POST /date/decade-start-end$0.002⚙️ Developer UtilitiesFree
Fraction of year elapsed
UTC year progress calculator
B
POST /date/fraction-of-year-elapsed$0.002⚙️ Developer UtilitiesFree
First and last day of year
find calendar year boundaries
B
POST /date/year-start-end$0.002⚙️ Developer UtilitiesFree
End of next month calculator
find the exact date
B
POST /date/end-of-next-month$0.002⚙️ Developer UtilitiesFree
Nth weekday after a date
find the next chosen weekday occurrence
B
POST /date/nth-weekday-from-date$0.002⚙️ Developer UtilitiesFree
Weekday of the first of the month from an ISO date
K
POST /date/weekday-of-first-of-month$0.002⚙️ Developer UtilitiesFree
Julian–Gregorian day offset calculator by date year
K
POST /date/julian-gregorian-offset$0.002⚙️ Developer UtilitiesFree
Week number within quarter
calculate from an ISO date
B
POST /date/week-number-in-quarter$0.002⚙️ Developer UtilitiesFree
Number of weeks in a month
calendar week calculator
K
POST /date/weeks-in-month$0.002⚙️ Developer UtilitiesFree
Date to .NET ticks converter
exact UTC DateTime ticks
B
POST /date/date-to-dotnet-ticks$0.002⚙️ Developer UtilitiesFree
Hebrew Year Length Calculator
353 to 385 Days
B
POST /date/hebrew-year-length$0.002⚙️ Developer UtilitiesFree
Hijri month length calculator
29 or 30 days
K
POST /date/hijri-month-length$0.002⚙️ Developer UtilitiesFree
Ethiopian to Gregorian date converter
K
POST /date/ethiopian-to-gregorian$0.002⚙️ Developer UtilitiesFree
Good Friday date calculator
Gregorian calendar
K
POST /date/good-friday$0.002⚙️ Developer UtilitiesFree
Gregorian to Minguo ROC year and date converter
B
POST /date/gregorian-to-minguo$0.002⚙️ Developer UtilitiesFree
Cyber Monday date
calculate the Monday after Thanksgiving
K
POST /date/cyber-monday$0.002⚙️ Developer UtilitiesFree
EU daylight saving end date calculator
last Sunday in October
K
POST /date/daylight-saving-end-eu$0.002⚙️ Developer UtilitiesFree
Super Bowl Sunday date calculator
second Sunday of February
B
POST /date/super-bowl-sunday$0.002⚙️ Developer UtilitiesFree
Whit Monday date calculator
the day after Pentecost
B
POST /date/whit-monday$0.002⚙️ Developer UtilitiesFree
Tabular Day of Ashura date calculator
Hijri to Gregorian
B
POST /date/ashura-tabular$0.002⚙️ Developer UtilitiesFree
Shavuot date calculator by Gregorian year
K
POST /date/shavuot-date$0.002⚙️ Developer UtilitiesFree
Gap between two time intervals
UTC duration calculator
K
POST /date/intervals-gap$0.002⚙️ Developer UtilitiesFree
ISO 8601 duration to seconds converter
K
POST /date/iso-duration-to-seconds$0.002⚙️ Developer UtilitiesFree
Milestone birthday dates calculator from a birth date
K
POST /date/milestone-birthday-dates$0.002⚙️ Developer UtilitiesFree
Date of your next round age
30th, 40th, 50th birthday calculator
B
POST /date/next-round-age-day$0.002⚙️ Developer UtilitiesFree
Time elapsed percentage calculator
ISO datetime interval progress
K
POST /date/time-progress-percent$0.002⚙️ Developer UtilitiesFree
Convert an ISO datetime to Windows FILETIME
K
POST /date/iso-to-windows-filetime$0.002⚙️ Developer UtilitiesFree
Military time zone letter
UTC offset to NATO designator
B
POST /date/military-time-zone-letter$0.002⚙️ Developer UtilitiesFree
Minutes to UTC offset string
format signed minutes as UTC±HH:MM
K
POST /date/minutes-to-offset$0.002⚙️ Developer UtilitiesFree
Civil Twilight Times Calculator
Approximate Dawn and Dusk in UTC
K
POST /date/civil-twilight-approx$0.002⚙️ Developer UtilitiesFree
Date as fractional year
convert ISO datetime to decimal year
B
POST /date/fractional-year$0.002⚙️ Developer UtilitiesFree
Next full moon date calculator
B
POST /date/next-full-moon$0.002⚙️ Developer UtilitiesFree
Maximum Power Transfer Calculator
Match Load Resistance
B
POST /elec/max-power-transfer$0.002⚙️ Developer UtilitiesFree
Two-node voltage analysis calculator
solve nodal equations
B
POST /elec/nodal-analysis-2$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.