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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Get your API key Browse the catalog
7554ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesVolume to density calculatorρ=m/V from mass and volumeAabuela$0.002Open phys.volume_to_density →New⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulation →New⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_number →New⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocity →New⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficient →New⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rate →New⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strain →New⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmission →New⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffness →New⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_spring →New⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertia →New⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation →

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
Tariff Revenue Calculator
Imports Remaining After a Tariff
Kkatherine
POST /econ/tariff-revenue$0.002
⚙️ Developer UtilitiesFree
Theil index calculator
inequality T from income distribution
Ssamurai
POST /econ/theil-index-distribution$0.002
⚙️ Developer UtilitiesFree
Total market surplus calculator
consumer + producer at equilibrium
Aabuela
POST /econ/total-surplus-market$0.002
⚙️ Developer UtilitiesFree
Consumption beyond PPF from trade
specialization & terms of trade
Aabuela
POST /econ/trade-gain-consumption$0.002
⚙️ Developer UtilitiesFree
Value of Marginal Product of Labor Calculator
Bbarbara
POST /econ/value-of-marginal-product$0.002
⚙️ Developer UtilitiesFree
Zero-Sum Game Value Calculator
2x2 Optimal Strategies
Bbarbara
POST /econ/zero-sum-game-value$0.002
⚙️ Developer UtilitiesFree
Average of grades calculator
mean, total, and count
Ffrances
POST /edu/average-of-grades$0.002
⚙️ Developer UtilitiesFree
CEFR vocabulary target
how many words to learn to the next level
Aabuela
POST /edu/cefr-vocab-target$0.002
⚙️ Developer UtilitiesFree
Citation Density Calculator
Citations per 1,000 Words
Kkatherine
POST /edu/citation-density$0.002
⚙️ Developer UtilitiesFree
Class exam average calculator
mean, highest, lowest, and range of scores
Ssamurai
POST /edu/class-exam-average$0.002
⚙️ Developer UtilitiesFree
Cosine Text Similarity Calculator
Compare Word Frequency Vectors
Bbarbara
POST /edu/cosine-text-similarity$0.002
⚙️ Developer UtilitiesFree
Course load weekly hours
contact + study across enrolled courses
PPavilion
POST /edu/course-load-hours$0.002
⚙️ Developer UtilitiesFree
Current Grade Percentage Calculator
Graded Work Only
Bbarbara
POST /edu/current-grade-percentage$0.002
⚙️ Developer UtilitiesFree
Daily study hours for goal
hours per day until your deadline
Aabuela
POST /edu/daily-study-goal$0.002
⚙️ Developer UtilitiesFree
Debate speaking time split
constructive, rebuttal & CX by format
Ssamurai
POST /edu/debate-time-split$0.002
⚙️ Developer UtilitiesFree
Direct Proportion Solver
Find the Missing Ratio Term
Kkatherine
POST /edu/direct-proportion$0.002
⚙️ Developer UtilitiesFree
Effective reading rate with comprehension
WPM × accuracy
Ssamurai
POST /edu/effective-reading-rate$0.002
⚙️ Developer UtilitiesFree
Essay Completion Percentage Calculator
Track Words Left
Ffrances
POST /edu/essay-completion-percent$0.002
⚙️ Developer UtilitiesFree
Exam Pass Threshold Checker
Score, Percentage and Margin
Kkatherine
POST /edu/exam-pass-threshold$0.002
⚙️ Developer UtilitiesFree
Exam Prep Timeline Builder
Schedule Every Topic Before Test Day
Ffrances
POST /edu/exam-prep-timeline$0.002
⚙️ Developer UtilitiesFree
Exam topics coverage
% of syllabus topics you have studied
Aabuela
POST /edu/exam-topics-coverage$0.002
⚙️ Developer UtilitiesFree
Exponent power calculator
base^n with zero and negative exponents
PPavilion
POST /edu/exponent-power$0.002
⚙️ Developer UtilitiesFree
Daily flashcard review load calculator
Bbarbara
POST /edu/flashcard-review-load$0.002
⚙️ Developer UtilitiesFree
Flat Bump Grade Curve Calculator
Bbarbara
POST /edu/flat-bump-curve$0.002
⚙️ Developer UtilitiesFree
Simplify fraction to lowest terms
reduce by GCD free
Ssamurai
POST /edu/fraction-simplify$0.002
⚙️ Developer UtilitiesFree
GPA 10 to 4 point converter
Indian CGPA to US GPA (×0.4)
Ssamurai
POST /edu/gpa-10-to-4-scale$0.002
⚙️ Developer UtilitiesFree
GPA after dropping a course
recompute average without withdrawn class
PPavilion
POST /edu/gpa-after-dropping-course$0.002
⚙️ Developer UtilitiesFree
GPA from letter grades calculator
credit-weighted GPA
Ffrances
POST /edu/gpa-from-letter-grades$0.002
⚙️ Developer UtilitiesFree
GPA to India percentage converter for applications
Kkatherine
POST /edu/gpa-to-india-percent$0.002
⚙️ Developer UtilitiesFree
GPA to percentage converter
4.0 scale GPA to percent grade
Aabuela
POST /edu/gpa-to-percentage$0.002
⚙️ Developer UtilitiesFree
Grade from number of errors
percentage and letter grade
Bbarbara
POST /edu/grade-from-errors$0.002
⚙️ Developer UtilitiesFree
Grade percentage from fraction
score out of total to % and letter
Aabuela
POST /edu/grade-percentage-from-fraction$0.002
⚙️ Developer UtilitiesFree
Possible final grade range
best and worst grades still reachable
Ffrances
POST /edu/grade-range-remaining$0.002
⚙️ Developer UtilitiesFree
GRE Total Score Combiner
Add Verbal and Quantitative Scores
Bbarbara
POST /edu/gre-total-combine$0.002
⚙️ Developer UtilitiesFree
Lexical Density Calculator
Measure Content Word Ratio
Kkatherine
POST /edu/lexical-density$0.002
⚙️ Developer UtilitiesFree
Linear grade curve calculator
add points to every score, cap at 100%
Ssamurai
POST /edu/linear-grade-curve$0.002
⚙️ Developer UtilitiesFree
Minimum passing grade calculator
score needed on remaining work to pass
Aabuela
POST /edu/minimum-passing-grade$0.002
⚙️ Developer UtilitiesFree
Mixed number to improper fraction
whole + a/b to numerator/denominator
PPavilion
POST /edu/mixed-to-improper$0.002
⚙️ Developer UtilitiesFree
MLA format pages estimator
word count to pages (TNR 12, double space)
PPavilion
POST /edu/mla-pages-estimate$0.002
⚙️ Developer UtilitiesFree
Multiple choice exam score
correct, incorrect, blank + penalty
Aabuela
POST /edu/multiple-choice-score$0.002
⚙️ Developer UtilitiesFree
Next spaced repetition interval calculator
Bbarbara
POST /edu/next-spaced-interval$0.002
⚙️ Developer UtilitiesFree
Participation Weighted Grade Calculator
Kkatherine
POST /edu/participation-weighted-grade$0.002
⚙️ Developer UtilitiesFree
Score Above Mean Calculator
Point and Standard-Deviation Gap
Ffrances
POST /edu/percent-above-mean$0.002
⚙️ Developer UtilitiesFree
School percentage change calculator
find increases and decreases
Bbarbara
POST /edu/percent-change-school$0.002
⚙️ Developer UtilitiesFree
Percentage to fraction for school
show and simplify p/100
Ffrances
POST /edu/percent-to-fraction$0.002
⚙️ Developer UtilitiesFree
Percentile band classifier
low, average, high score bands
Aabuela
POST /edu/percentile-band-classifier$0.002
⚙️ Developer UtilitiesFree
Plus and minus GPA converter
letter grades to grade points
Kkatherine
POST /edu/plus-minus-gpa$0.002
⚙️ Developer UtilitiesFree
Points Lost to Target Grade Calculator
Remaining Point Budget
Kkatherine
POST /edu/points-lost-to-grade$0.002
⚙️ Developer UtilitiesFree
Points needed for letter grade
total-points course calculator
Ssamurai
POST /edu/points-needed-for-letter$0.002
⚙️ Developer UtilitiesFree
Pomodoro Finish Time Estimator
Include Short and Long Breaks
Kkatherine
POST /edu/pomodoro-finish-time$0.002
⚙️ Developer UtilitiesFree
Prime Factorization for School
Steps and Exponents
Bbarbara
POST /edu/prime-factorization-school$0.002
⚙️ Developer UtilitiesFree
Q&A questions in time calculator
Kkatherine
POST /edu/qa-questions-time$0.002
⚙️ Developer UtilitiesFree
Range of grades calculator
highest minus lowest score spread
Ssamurai
POST /edu/range-of-grades$0.002
⚙️ Developer UtilitiesFree
Text grade level from length
school grade from sentences and syllables
Aabuela
POST /edu/reading-level-grade$0.002
⚙️ Developer UtilitiesFree
Reading speed needed for a deadline
required WPM from pages and time
Ssamurai
POST /edu/reading-speed-needed$0.002
⚙️ Developer UtilitiesFree
Round to decimal places
number before and after, free
Aabuela
POST /edu/round-to-places$0.002
⚙️ Developer UtilitiesFree
Rubric Weighted Score Calculator
Add Weighted Criterion Scores
Kkatherine
POST /edu/rubric-weighted-score$0.002
⚙️ Developer UtilitiesFree
SAT total score combiner
EBRW + Math on the 400–1600 scale
Ssamurai
POST /edu/sat-section-combine$0.002
⚙️ Developer UtilitiesFree
Scale grade to new maximum
rescale a score to a different point total
Aabuela
POST /edu/scale-grade-new-max$0.002
⚙️ Developer UtilitiesFree
Scale raw test score calculator
rescale scores to a new range
Bbarbara
POST /edu/scale-raw-score$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 — 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.

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