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
Check password patterns
keyboard walks, repeats, and substitutions
K
POST /security/password-breach-pattern-check$0.002🎧 Audio & VoiceFree
Compute multitrack mixdown gain from peaks and relative levels
K
POST /audio/multi-track-mixdown-levels$0.002⚙️ Developer UtilitiesFree
Add or subtract days from a date
calendar date calculator
F
POST /math/add-subtract-days$0.002⚙️ Developer UtilitiesFree
Calculate countdown to a target date in days, hours and minutes
B
POST /math/countdown-to-date$0.002🎬 VideoFree
Calculate a multicam clip sync offset from audio spikes
B
POST /video/multi-cam-sync-offset$0.002🎬 VideoFree
Convert timecode to frame number
HH:MM:SS:FF ↔ total frames
A
POST /video/timecode-convert-frames$0.002⚙️ Developer UtilitiesFree
Calculate basal metabolic rate with the Mifflin-St Jeor equation
B
POST /math/bmr-calculate$0.002⚙️ Developer UtilitiesFree
Calculate paint needed for an area
coats and coverage calculator
K
POST /math/paint-area-coverage$0.002⚙️ Developer UtilitiesFree
Estimate pregnancy due date
LMP + 280 days (Naegele)
S
POST /math/pregnancy-due-date$0.002⚙️ Developer UtilitiesFree
Predict race finish time with Riegel's formula
F
POST /math/race-finish-time-predict$0.002⚙️ Developer UtilitiesFree
Calculate time difference between UTC offsets
K
POST /math/time-zone-offset-diff$0.002⚙️ Developer UtilitiesFree
Calculate tiles needed for a floor area with waste allowance
B
POST /math/tile-flooring-count$0.002⚙️ Developer UtilitiesFree
Find overlapping meeting hours across time zones
free
P
POST /travel/time-zone-meeting-finder$0.002🗂️ Data & FilesFree
Normalize text line endings
convert LF and CRLF online
F
POST /data/normalize-line-endings$0.002⚙️ Developer UtilitiesFree
Test score curve calculator
adjust grades with three methods
F
POST /edu/test-curve-adjust$0.002🎧 Audio & VoiceFree
Shift karaoke lyrics timing by a global millisecond offset
F
POST /audio/karaoke-lyrics-sync-shift$0.002⚙️ Developer UtilitiesFree
Calculate class attendance percentage and check a policy threshold
K
POST /edu/attendance-percentage$0.002⚙️ Developer UtilitiesFree
Allocate Exam Time per Question by Points
B
POST /edu/exam-time-per-question$0.002⚙️ Developer UtilitiesFree
Merge flashcard decks
dedupe by front, keep first card
P
POST /edu/flashcard-deck-merge$0.002⚙️ Developer UtilitiesFree
Lesson plan time budget
allocate class minutes by activity weight
S
POST /edu/lesson-plan-time-budget$0.002⚙️ Developer UtilitiesFree
Shuffle quiz answer choices with a seed
keep the correct index
A
POST /edu/multiple-choice-shuffle-seeded$0.002⚙️ Developer UtilitiesFree
Dragon Boat Festival date
free
A
POST /date/dragon-boat-festival$0.002⚙️ Developer UtilitiesFree
Seeded Giveaway Winner Picker
Reproducible Weighted Draw
K
POST /game/giveaway-winner-pick$0.002⚙️ Developer UtilitiesFree
Filter Wordle candidate words by green, yellow and gray clues
F
POST /game/wordle-solver-filter$0.002🗂️ Data & FilesFree
Convert JSON object to query string
percent-encoded URL params free
P
POST /data/json-to-query-params$0.002⚙️ Developer UtilitiesFree
Anagram solver against a dictionary
find every possible word
B
POST /game/anagram-solver-dictionary$0.002⚙️ Developer UtilitiesFree
Ex-meridian reduction latitude
free
A
POST /geo/ex-meridian$0.002⚙️ Developer UtilitiesFree
Check a Valid Word Ladder Step
One-Letter Difference
K
POST /game/word-ladder-step-check$0.002⚙️ Developer UtilitiesFree
Validate chess algebraic notation
SAN syntax checker
F
POST /game/chess-algebraic-validate$0.002⚙️ Developer UtilitiesFree
Trivia quiz score calculator with speed bonuses
K
POST /game/trivia-score-calc$0.002⚙️ Developer UtilitiesFree
Calculate Scrabble Word Score with Letter and Word Multipliers
F
POST /game/scrabble-word-score$0.002🎬 VideoFree
Shift SRT subtitle timing by milliseconds
F
POST /video/subtitle-srt-shift$0.002⚙️ Developer UtilitiesFree
Blackjack Hand Value Calculator
Count Aces Correctly
B
POST /game/blackjack-hand-value$0.002⚙️ Developer UtilitiesFree
Calculate cart abandonment rate from carts and checkouts
K
POST /ecom/cart-abandonment-rate$0.002⚙️ Developer UtilitiesFree
Calculate target price for margin from product cost
F
POST /ecom/product-margin-target-price$0.002⚙️ Developer UtilitiesFree
Calculate average order value from revenue and orders
B
POST /ecom/average-order-value$0.002⚙️ Developer UtilitiesFree
Angular momentum calculator
L = Iω in kg·m²/s
B
POST /mech/angular-momentum$0.002⚙️ Developer UtilitiesFree
Hollow Cylinder Moment of Inertia Calculator
K
POST /mech/moment-of-inertia-cylinder-hollow$0.002⚙️ Developer UtilitiesFree
Rod moment of inertia about one end
I = (1/3) m L² free
S
POST /mech/moment-of-inertia-rod-end$0.002⚙️ Developer UtilitiesFree
Rotational Power Calculator
Torque Times Angular Velocity
F
POST /mech/rotational-power$0.002⚙️ Developer UtilitiesFree
Angular to arc distance calculator
wheel travel from radians
K
POST /mech/angular-to-arc-distance$0.002⚙️ Developer UtilitiesFree
Gravitational field strength calculator
g = GM/r² free
S
POST /mech/gravitational-field-strength$0.002⚙️ Developer UtilitiesFree
Hollow sphere moment of inertia
thin shell I = ⅔ m r²
P
POST /mech/moment-of-inertia-sphere-hollow$0.002⚙️ Developer UtilitiesFree
Rolling shapes race calculator
rank acceleration by inertia
B
POST /mech/rolling-race$0.002⚙️ Developer UtilitiesFree
Torque Wrench Force Calculator
Force from Torque and Length
F
POST /mech/torque-wrench$0.002⚙️ Developer UtilitiesFree
Escape energy calculator
kinetic energy needed to leave a planet
K
POST /mech/escape-energy$0.002⚙️ Developer UtilitiesFree
Gravitational potential calculator
Φ = −GM/r free
S
POST /mech/gravitational-potential$0.002⚙️ Developer UtilitiesFree
Orbit altitude from period calculator
h from T, mass and radius, free
P
POST /mech/orbital-altitude-from-period$0.002⚙️ Developer UtilitiesFree
Synchronous orbit radius calculator
planet mass and day length
F
POST /mech/synchronous-orbit-radius$0.002⚙️ Developer UtilitiesFree
Vis-viva calculator
orbital speed from radius and semi-major axis
B
POST /mech/vis-viva$0.002⚙️ Developer UtilitiesFree
Compare fractions
which of a/b and c/d is larger
G
POST /math/comparing-fractions$0.002⚙️ Developer UtilitiesFree
Complementary angle calculator
complement of an acute angle in degrees
G
POST /math/complementary-angles$0.002⚙️ Developer UtilitiesFree
Mutual gravitational acceleration calculator
a₁=Gm₂/r² free
S
POST /mech/mutual-gravitational-acceleration$0.002⚙️ Developer UtilitiesFree
SHM maximum acceleration calculator
a max = Aω²
K
POST /mech/shm-max-acceleration$0.002⚙️ Developer UtilitiesFree
Mass-spring period calculator
T = 2π√(m/k)
F
POST /mech/shm-period-mass-spring$0.002⚙️ Developer UtilitiesFree
SHM velocity calculator
velocity at a displacement
B
POST /mech/shm-velocity$0.002⚙️ Developer UtilitiesFree
Compatible numbers
estimate a quotient or product with friendly numbers
H
POST /math/compatible-numbers$0.002⚙️ Developer UtilitiesFree
Completing the square
rewrite ax²+bx+c as a(x−h)²+k, free
G
POST /math/completing-the-square$0.002⚙️ Developer UtilitiesFree
Second-class lever calculator
wheelbarrow effort from load and arms
S
POST /mech/lever-second-class$0.002⚙️ Developer UtilitiesFree
Pendulum bob maximum speed calculator from length and angle
B
POST /mech/pendulum-bob-speed$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.