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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
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The full catalog
Search or filter by category. Every capability is its own endpoint with a published price.
⚙️ Developer UtilitiesFree
Pie chart angles from values free online
S
POST /math/pie-chart-angles$0.002⚙️ Developer UtilitiesFree
Pipes and cisterns calculator free online
A
POST /math/pipes-cisterns$0.002⚙️ Developer UtilitiesFree
Sainte-Laguë seat allocation calculator free
S
POST /math/sainte-lague$0.002⚙️ Developer UtilitiesFree
Orthodox Christmas date
free
A
POST /date/orthodox-christmas$0.002⚙️ Developer UtilitiesFree
Victoria Day (Canada) date
free
A
POST /date/victoria-day-ca$0.002⚙️ Developer UtilitiesFree
Week of month calculator
free
A
POST /date/week-of-month$0.002⚙️ Developer UtilitiesFree
CD early withdrawal penalty
free
A
POST /finance/cd-early-penalty$0.002⚙️ Developer UtilitiesFree
Lease buyout cost
free
A
POST /finance/lease-buyout-cost$0.002⚙️ Developer UtilitiesFree
Mortgage offset account savings
free
A
POST /finance/mortgage-offset$0.002⚙️ Developer UtilitiesFree
Negative equity roll-in
free
A
POST /finance/negative-equity-rollin$0.002⚙️ Developer UtilitiesFree
Mortgage points break-even
free
A
POST /finance/points-breakeven$0.002⚙️ Developer UtilitiesFree
Prepayment penalty calculator
free
A
POST /finance/prepayment-penalty$0.002⚙️ Developer UtilitiesFree
Quarterly estimated tax
free
A
POST /finance/quarterly-estimated-tax$0.002⚙️ Developer UtilitiesFree
Standard vs itemized deduction
free
A
POST /finance/standard-vs-itemized$0.002⚙️ Developer UtilitiesFree
Gall–Peters projection calculator
free
A
POST /geo/gall-peters$0.002⚙️ Developer UtilitiesFree
Geocentric radius calculator
free
A
POST /geo/geocentric-radius$0.002⚙️ Developer UtilitiesFree
Vertical sextant angle distance
free
A
POST /geo/vertical-sextant-angle$0.002⚙️ Developer UtilitiesFree
Arithmetico-geometric series sum
free
A
POST /math/arithmetico-geometric-series$0.002⚙️ Developer UtilitiesFree
Chain discount / net price factor
free
A
POST /math/chain-discount$0.002⚙️ Developer UtilitiesFree
Hexagonal prism calculator
free
A
POST /math/hexagonal-prism$0.002⚙️ Developer UtilitiesFree
Markdown percentage calculator
free
A
POST /math/markdown-percent$0.002⚙️ Developer UtilitiesFree
Motzkin number calculator
free
A
POST /math/motzkin-number$0.002⚙️ Developer UtilitiesFree
Power of a point calculator
free
A
POST /math/power-of-a-point$0.002⚙️ Developer UtilitiesFree
Regular tetrahedron calculator
free
A
POST /math/regular-tetrahedron$0.002⚙️ Developer UtilitiesFree
Roman chronogram calculator
free
A
POST /math/roman-chronogram$0.002⚙️ Developer UtilitiesFree
Square pyramid calculator
free
A
POST /math/square-pyramid$0.002⚙️ Developer UtilitiesFree
Stair rise and run calculator
free
A
POST /math/stairs-rise-run$0.002⚙️ Developer UtilitiesFree
Tangent-secant theorem calculator
free
A
POST /math/tangent-secant-theorem$0.002⚙️ Developer UtilitiesFree
Wastage allowance calculator
free
A
POST /math/wastage-allowance$0.002⚙️ Developer UtilitiesFree
Hedges g effect size
free
A
POST /stat/hedges-g$0.002⚙️ Developer UtilitiesFree
Matthews correlation (MCC)
free
A
POST /stat/matthews-corr$0.002⚙️ Developer UtilitiesFree
Haversine distance - great-circle km, mi and m between two points
A
POST /geo/haversine$0.002⚙️ Developer UtilitiesFree
Absolute value equation solver
solve |ax+b|=c for x
S
POST /algebra/absolute-value-equation$0.002⚙️ Developer UtilitiesFree
Finite series partial sum
accumulate terms, free
S
POST /algebra/partial-sum-series$0.002⚙️ Developer UtilitiesFree
2×2 system by substitution
isolate, solve, free
S
POST /algebra/system-2x2-substitution$0.002⚙️ Developer UtilitiesFree
Kepler's third law calculator
find period or radius from a known orbit
A
POST /astro/kepler-third-law$0.002⚙️ Developer UtilitiesFree
Physical size from angular diameter
small-angle calculator
A
POST /astro/physical-size-from-angular$0.002⚙️ Developer UtilitiesFree
Propellant mass fraction calculator
delta-v and exhaust velocity
A
POST /astro/propellant-mass-fraction$0.002⚙️ Developer UtilitiesFree
Limiting reactant calculator
which reactant runs out first
A
POST /chem/limiting-reactant$0.002⚙️ Developer UtilitiesFree
Moles of product calculator
reactant moles and mole ratio
A
POST /chem/moles-of-product$0.002⚙️ Developer UtilitiesFree
Electrolysis overpotential calculator
applied vs thermodynamic voltage
A
POST /chem/overpotential$0.002⚙️ Developer UtilitiesFree
Percent yield calculator
actual over theoretical yield
A
POST /chem/percent-yield$0.002⚙️ Developer UtilitiesFree
Darken a hex color by percentage
lower lightness, free
P
POST /color/darken$0.002⚙️ Developer UtilitiesFree
RGB to CMYK converter
print percentages, free online
P
POST /color/rgb-cmyk$0.002⚙️ Developer UtilitiesFree
Binomial coefficients row
n choose 0…n as BigInt, free
S
POST /combo/binomial-row$0.002⚙️ Developer UtilitiesFree
Decibel ratio converter
dB to power or amplitude linear ratio
P
POST /conv/decibel-ratio$0.002⚙️ Developer UtilitiesFree
Electrical conductivity converter
S/m, S/cm, mho/m, free
P
POST /conv/electrical-conductivity$0.002⚙️ Developer UtilitiesFree
Convert equivalent dose
Sv, mSv, µSv, rem, free
P
POST /conv/equivalent-dose$0.002⚙️ Developer UtilitiesFree
HP to kW converter
horsepower to kilowatts, exact factor
P
POST /conv/hp-to-kw$0.002⚙️ Developer UtilitiesFree
Length converter
meters, km, miles, feet, inches, yards
P
POST /conv/length$0.002⚙️ Developer UtilitiesFree
Convert mass moment of inertia
kg·m², g·cm², lb·ft², free
P
POST /conv/moment-of-inertia$0.002⚙️ Developer UtilitiesFree
Pressure gradient converter
Pa/m, psi/ft, bar/m and more
P
POST /conv/pressure-gradient$0.002⚙️ Developer UtilitiesFree
Stone to lbs converter
exact 14 lb factor, free online
P
POST /conv/stone-to-lbs$0.002⚙️ Developer UtilitiesFree
Temperature converter
Celsius, Fahrenheit, Kelvin, Rankine
P
POST /conv/temperature$0.002⚙️ Developer UtilitiesFree
Add working days to a date
skip weekends, free
A
POST /date/add-workdays$0.002⚙️ Developer UtilitiesFree
US daylight saving start date
second Sunday of March, free
A
POST /date/daylight-saving-start-us$0.002⚙️ Developer UtilitiesFree
Days elapsed in the quarter
count whole days from quarter start
A
POST /date/days-elapsed-quarter$0.002⚙️ Developer UtilitiesFree
Easter Sunday date
Gregorian computus for any year
A
POST /date/easter$0.002⚙️ Developer UtilitiesFree
Generation by birth year
Millennial, Gen Z, Boomer and more
A
POST /date/generation-cohort$0.002⚙️ Developer UtilitiesFree
Battery runtime from Ah
capacity, load current, and usable DoD
A
POST /elec/battery-runtime-ah$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 — 7800+ 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.