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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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7825ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesNull space calculatorkernel basis of a matrix from its rowsSsamurai$0.002Open math.null_space →New⚙️ Developer UtilitiesLogical NOR calculatortrue only when both inputs are falsePPavilion$0.002Open math.nor →New⚙️ Developer UtilitiesMultiply complex numbers(a+bi)(c+di) product, freeAabuela$0.002Open math.multiply_complex_numbers →New⚙️ Developer UtilitiesMöbius strip calculatorsurface area and edge lengthSsamurai$0.002Open math.mobius_strip →New⚙️ Developer UtilitiesLong multiplication calculatordigit-by-digit product, freeAabuela$0.002Open math.long_multiplication →New⚙️ Developer UtilitiesMean calculatorarithmetic mean of a list of numbersPPavilion$0.002Open math.mean →New⚙️ Developer UtilitiesLog2 calculatorbase-2 logarithm of a positive numberSsamurai$0.002Open math.log_2 →New⚙️ Developer UtilitiesLine of intersection of two planesparametric formAabuela$0.002Open math.line_of_intersection_of_two_planes →New⚙️ Developer UtilitiesLinear-feedback shift registerLFSR bit sequence from tapsSsamurai$0.002Open math.linear_feedback_shift_register →New⚙️ Developer UtilitiesLinear combination calculatorweighted sum of vectorsPPavilion$0.002Open math.linear_combination →New⚙️ Developer UtilitiesLength of a rectangle calculatorfrom area and width, freeAabuela$0.002Open math.length_of_a_rectangle →New⚙️ Developer UtilitiesLeast to greatest fractionssort a list from smallest to largestPPavilion$0.002Open math.least_to_greatest_fractions →

Popular capabilities

Loved right now, by real traffic.

The full catalog

Search or filter by category. Every capability is its own endpoint with a published price.

⚙️ Developer UtilitiesFree
Dominical letter calculator
Gregorian A–G (or two letters in leap years), free
AAspire
POST /date/dominical-letter$0.002
⚙️ Developer UtilitiesFree
Doomsday rule calculator
Conway weekday from ISO date, free
Aabuela
POST /date/doomsday-weekday$0.002
⚙️ Developer UtilitiesFree
Orthodox Easter date calculator
Julian computus to Gregorian, free
AAspire
POST /date/easter-orthodox$0.002
⚙️ Developer UtilitiesFree
Friday the 13th finder
every Friday the 13th in a year, free
PPavilion
POST /date/friday-13th$0.002
⚙️ Developer UtilitiesFree
Humanize duration
seconds to days, hours, minutes (readable)
PPavilion
POST /date/humanize-duration$0.002
⚙️ Developer UtilitiesFree
Leap year checker
Gregorian leap test and divisibility reason
PPavilion
POST /date/is-leap-year$0.002
⚙️ Developer UtilitiesFree
ISO weekday number
Monday=1 to Sunday=7 from an ISO date
PPavilion
POST /date/iso-weekday-number$0.002
⚙️ Developer UtilitiesFree
Julian Day Number calculator
ISO date to astronomical JDN, free
AAspire
POST /date/julian-day-number$0.002
⚙️ Developer UtilitiesFree
Last weekday of the month
final Monday–Sunday date, free
PPavilion
POST /date/last-weekday-of-month$0.002
⚙️ Developer UtilitiesFree
Leap years in a range
count and list Gregorian leap years between two years, free
AAspire
POST /date/leap-years-between$0.002
⚙️ Developer UtilitiesFree
Printable month calendar generator
weeks layout, free
Aabuela
POST /date/month-calendar$0.002
⚙️ Developer UtilitiesFree
Months between two dates
whole months and remaining days, free
Aabuela
POST /date/months-between$0.002
⚙️ Developer UtilitiesFree
Nth weekday of the month
third Monday, last Friday and any ordinal date, free
AAspire
POST /date/nth-weekday-of-month$0.002
⚙️ Developer UtilitiesFree
ISO ordinal date converter
YYYY-MM-DD ↔ YYYY-DDD, free
Aabuela
POST /date/ordinal-date$0.002
⚙️ Developer UtilitiesFree
Previous weekday occurrence
most recent Monday–Sunday before a date, free
PPavilion
POST /date/previous-weekday$0.002
⚙️ Developer UtilitiesFree
Calendar quarter finder
ISO date to Q1–Q4 with start and end dates, free
AAspire
POST /date/quarter-of-year$0.002
⚙️ Developer UtilitiesFree
Quarter start and end dates
Q1–Q4 calendar range, free
Aabuela
POST /date/quarter-start-end$0.002
⚙️ Developer UtilitiesFree
Recurring dates generator
every N days from start to end, free
Aabuela
POST /date/recurring-dates$0.002
⚙️ Developer UtilitiesFree
Season of the year calculator
meteorological season by hemisphere
PPavilion
POST /date/season$0.002
⚙️ Developer UtilitiesFree
US week number calculator
Sunday start, week 1 has Jan 1
Aabuela
POST /date/us-week-number$0.002
⚙️ Developer UtilitiesFree
Week start and end dates
ISO date plus first weekday to Monday–Sunday range, free
AAspire
POST /date/week-start-end$0.002
⚙️ Developer UtilitiesFree
Weekday count in a year
how many Mondays, free
Aabuela
POST /date/weekday-frequency$0.002
⚙️ Developer UtilitiesFree
Weekend days between two dates
count Saturdays and Sundays in a date range, free
AAspire
POST /date/weekend-count$0.002
⚙️ Developer UtilitiesFree
Weeks between two dates
whole weeks and leftover days from ISO dates, free
AAspire
POST /date/weeks-between$0.002
⚙️ Developer UtilitiesFree
Year progress percentage
ISO date to % of calendar year elapsed, free
AAspire
POST /date/year-progress$0.002
⚙️ Developer UtilitiesFree
Zeller's congruence calculator
weekday from ISO date, step by step
PPavilion
POST /date/zeller-weekday$0.002
⚙️ Developer UtilitiesFree
Zodiac element calculator
birth date to fire, earth, air, water
Aabuela
POST /date/zodiac-element$0.002
⚙️ Developer UtilitiesFree
Western zodiac sign calculator
birth date to sign, free
Aabuela
POST /date/zodiac-sign$0.002
⚙️ Developer UtilitiesFree
AWG ampacity calculator
max safe current by wire gauge
Aabuela
POST /elec/awg-ampacity$0.002
⚙️ Developer UtilitiesFree
AWG wire gauge calculator
diameter, area and ohms per metre, free
AAspire
POST /elec/awg-wire$0.002
⚙️ Developer UtilitiesFree
Battery life calculator
runtime hours from mAh capacity and mA draw, free
AAspire
POST /elec/battery-life$0.002
⚙️ Developer UtilitiesFree
Capacitive reactance calculator
Xc=1/(2πfC) in ohms, free
AAspire
POST /elec/capacitive-reactance$0.002
⚙️ Developer UtilitiesFree
Capacitor charge calculator
Q=CV stored charge from C and V, free
AAspire
POST /elec/capacitor-charge$0.002
⚙️ Developer UtilitiesFree
Capacitor charging calculator
V(t)=Vs(1−e^(−t/RC)) voltage during charge, free
AAspire
POST /elec/capacitor-charge-time$0.002
⚙️ Developer UtilitiesFree
Parallel capacitance calculator
total C for capacitors in parallel
Aabuela
POST /elec/capacitors-parallel$0.002
⚙️ Developer UtilitiesFree
Series capacitance calculator
capacitors in series, free
PPavilion
POST /elec/capacitors-series$0.002
⚙️ Developer UtilitiesFree
Electric charge calculator
Q=It solve charge, current or time
Aabuela
POST /elec/charge-current-time$0.002
⚙️ Developer UtilitiesFree
Coulomb's law calculator
electrostatic force between two charges
Aabuela
POST /elec/coulombs-law$0.002
⚙️ Developer UtilitiesFree
Current divider calculator
branch currents for two parallel resistors, free
AAspire
POST /elec/current-divider$0.002
⚙️ Developer UtilitiesFree
Electric field force calculator
F = qE, free in browser
PPavilion
POST /elec/electric-field-force$0.002
⚙️ Developer UtilitiesFree
Electric field calculator
E=kQ/r² point charge magnitude, free
AAspire
POST /elec/electric-field-point$0.002
⚙️ Developer UtilitiesFree
Electricity cost calculator
appliance energy use and running cost
Aabuela
POST /elec/electrical-energy-cost$0.002
⚙️ Developer UtilitiesFree
Frequency period converter
T = 1/f and f = 1/T, free
Aabuela
POST /elec/frequency-period$0.002
⚙️ Developer UtilitiesFree
Inductive reactance calculator
XL = 2πfL in ohms, free
PPavilion
POST /elec/inductive-reactance$0.002
⚙️ Developer UtilitiesFree
LC resonant frequency calculator
f₀ = 1/(2π√(LC)), free
PPavilion
POST /elec/lc-resonant-frequency$0.002
⚙️ Developer UtilitiesFree
LED resistor calculator
series resistor and power rating
Aabuela
POST /elec/led-resistor$0.002
⚙️ Developer UtilitiesFree
Magnetic field of a straight wire calculator
B = μ₀I/(2πr), free
PPavilion
POST /elec/magnetic-field-wire$0.002
⚙️ Developer UtilitiesFree
Magnetic force calculator
Lorentz F=qvB sinθ on a moving charge, free
AAspire
POST /elec/magnetic-force-charge$0.002
⚙️ Developer UtilitiesFree
Force on a current-carrying wire calculator
F = I L B sin(θ)
Aabuela
POST /elec/magnetic-force-wire$0.002
⚙️ Developer UtilitiesFree
555 timer calculator
astable frequency and duty cycle
Aabuela
POST /elec/ne555-astable$0.002
⚙️ Developer UtilitiesFree
555 timer monostable calculator
pulse width t=1.1RC, free
AAspire
POST /elec/ne555-monostable$0.002
⚙️ Developer UtilitiesFree
Non-inverting amplifier calculator
gain Av = 1 + Rf/Rg, free
PPavilion
POST /elec/op-amp-noninverting$0.002
⚙️ Developer UtilitiesFree
Parallel-plate capacitor calculator
C from area, gap and dielectric
Aabuela
POST /elec/parallel-plate-capacitance$0.002
⚙️ Developer UtilitiesFree
Power gain dB calculator
G = 10·log10(Pout/Pin) from input and output power, free
AAspire
POST /elec/power-gain-db$0.002
⚙️ Developer UtilitiesFree
PWM duty cycle calculator
on-time, period, average voltage, free
PPavilion
POST /elec/pwm-duty-cycle$0.002
⚙️ Developer UtilitiesFree
RC filter cutoff calculator
fc = 1/(2πRC) for LP/HP filters
Aabuela
POST /elec/rc-filter-cutoff$0.002
⚙️ Developer UtilitiesFree
RC time constant calculator
τ=RC and 5τ settling time, free
AAspire
POST /elec/rc-time-constant$0.002
⚙️ Developer UtilitiesFree
Wire resistance calculator
R = ρL/A from resistivity, free
PPavilion
POST /elec/resistivity$0.002
⚙️ Developer UtilitiesFree
Series resistance calculator
total ohms for resistors in series, free
AAspire
POST /elec/resistors-series$0.002
⚙️ Developer UtilitiesFree
RL filter cutoff calculator
fc=R/(2πL) in hertz, free
AAspire
POST /elec/rl-filter-cutoff$0.002

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 — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.

Balance
$10.00+

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