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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iOS & AndroidBuilding
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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_densityNew⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulationNew⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_numberNew⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocityNew⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficientNew⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rateNew⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strainNew⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmissionNew⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffnessNew⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_springNew⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertiaNew⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation

The full catalog

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

⚙️ Developer UtilitiesFree
Airline miles value calculator
cents per point from cash fare and taxes, free
AAspire
POST /travel/miles-to-points$0.002
⚙️ Developer UtilitiesFree
Driving range remaining calculator
fuel or charge × economy, free
Aabuela
POST /travel/range-remaining$0.002
⚙️ Developer UtilitiesFree
Road trip time calculator
driving time and arrival offset, free
PPavilion
POST /travel/road-trip-time$0.002
⚙️ Developer UtilitiesFree
Speed unit converter
km/h, mph, knots, m/s, free
Aabuela
POST /travel/speed-unit-convert$0.002
⚙️ Developer UtilitiesFree
Timezone offset difference
hours between two UTC offsets, free
PPavilion
POST /travel/timezone-offset-diff$0.002
⚙️ Developer UtilitiesFree
Tire pressure by load calculator
adjust PSI for actual load, free
AAspire
POST /travel/tire-pressure-load$0.002
⚙️ Developer UtilitiesFree
Road trip cost split
fuel and tolls per passenger free
AAspire
POST /travel/trip-cost-split$0.002
⚙️ Developer UtilitiesFree
Trip fuel cost estimator
distance, MPG and fuel price, free
Aabuela
POST /travel/trip-fuel-cost$0.002
⚙️ Developer UtilitiesFree
Walking time estimator
distance and pace to duration, free
Aabuela
POST /travel/walking-time$0.002
⚙️ Developer UtilitiesFree
Amplitude, period & phase shift calculator
from A sin(Bx+C)+D
Aabuela
POST /trig/amplitude-period$0.002
⚙️ Developer UtilitiesFree
Angle of elevation calculator
distance and height to angle, free
AAspire
POST /trig/angle-of-elevation$0.002
⚙️ Developer UtilitiesFree
Coterminal angle calculator
positive and negative within one turn
Aabuela
POST /trig/coterminal-angle$0.002
⚙️ Developer UtilitiesFree
Degrees minutes seconds converter
DMS ↔ decimal degrees either way
PPavilion
POST /trig/dms-to-decimal$0.002
⚙️ Developer UtilitiesFree
Double-angle calculator
sin(2x), cos(2x), tan(2x) from one angle
Aabuela
POST /trig/double-angle$0.002
⚙️ Developer UtilitiesFree
Arccosine calculator
acos(x) in degrees and radians, free
AAspire
POST /trig/inverse-cos$0.002
⚙️ Developer UtilitiesFree
Arctangent calculator
atan and atan2 in degrees and radians
Aabuela
POST /trig/inverse-tan$0.002
⚙️ Developer UtilitiesFree
Law of cosines angle finder
three sides to all angles, free
AAspire
POST /trig/law-of-cosines-angle$0.002
⚙️ Developer UtilitiesFree
Law of sines calculator
missing side or angle from a pair
Aabuela
POST /trig/law-of-sines$0.002
⚙️ Developer UtilitiesFree
Polar to rectangular converter
r and θ to cartesian x, y
PPavilion
POST /trig/polar-to-rectangular$0.002
⚙️ Developer UtilitiesFree
Reference angle calculator
degrees or radians, quadrant, free
AAspire
POST /trig/reference-angle$0.002
⚙️ Developer UtilitiesFree
Right triangle trig solver
one side and acute angle, free
AAspire
POST /trig/right-triangle-trig$0.002
⚙️ Developer UtilitiesFree
Sine cosine tangent calculator
sin, cos, tan, csc, sec, cot from an angle
PPavilion
POST /trig/sin-cos-tan$0.002
⚙️ Developer UtilitiesFree
Sine wave calculator
amplitude, period, phase, vertical shift, value at x
PPavilion
POST /trig/sine-wave$0.002
⚙️ Developer UtilitiesFree
Sum and difference angle calculator
sin cos tan of a±b, free
AAspire
POST /trig/sum-difference$0.002
⚙️ Developer UtilitiesFree
Exact trig values calculator
sin cos tan radicals for special angles, free
AAspire
POST /trig/trig-exact-values$0.002
⚙️ Developer UtilitiesFree
Miles to km converter
convert miles to kilometers, free
Aabuela
POST /conv/miles-to-km$0.002
⚙️ Developer UtilitiesFree
Bearing and heading calculator
compass direction between two points
Aabuela
POST /trig/bearing$0.002
⚙️ Developer UtilitiesFree
Feet to cm converter
convert feet to centimeters, free
Aabuela
POST /conv/feet-to-cm$0.002
⚙️ Developer UtilitiesFree
Triangular number calculator
n-th triangle and membership test
PPavilion
POST /math/triangular-number$0.002
⚙️ Developer UtilitiesFree
Harshad number checker
Niven test and quotient, free
AAspire
POST /numth/harshad-number$0.002
⚙️ Developer UtilitiesFree
Rate constant from rate law calculator
k from measured rate, free
AAspire
POST /chem/rate-constant-from-rate$0.002
⚙️ Developer UtilitiesFree
PEM Base64 encoder
64-char lines with BEGIN/END headers, free
PPavilion
POST /enc/base64-pem$0.002
⚙️ Developer UtilitiesFree
Absence percentage calculator
days absent over scheduled workdays
Ggrace
POST /fin/absence-percentage$0.002
⚙️ Developer UtilitiesFree
AAA triangle calculator
three angles and one side via law of sines
Aada
POST /math/aaa-triangle$0.002
⚙️ Developer UtilitiesFree
Absolute humidity calculator
grams of water vapor per cubic meter, free
Hhedy
POST /phys/absolute-humidity$0.002
🗂️ Data & FilesFree
Convert number base
bases 2 to 36 with digit validation
Mmargaret
POST /data/base-n-convert$0.002
🗂️ Data & FilesFree
IPv4 CIDR range calculator
network, broadcast and usable hosts
Mmargaret
POST /data/ipv4-cidr-range$0.002
✍️ Text & AIFree
Group anagrams online
cluster words by matching letters
Mmargaret
POST /text/anagram-groups$0.002
✍️ Text & AIFree
Pangram checker
find missing letters in any sentence
Kkatherine
POST /text/pangram-check$0.002
✍️ Text & AIFree
Run-length encoding and decoding tool
Kkatherine
POST /text/run-length-encode$0.002
✍️ Text & AIFree
Check string rotation
test whether one string rotates into another
Kkatherine
POST /text/string-rotation-check$0.002
⚙️ Developer UtilitiesFree
pH acidity classifier
acidic, neutral or basic from pH
Ssamurai
POST /chem/acidity-classification$0.002
⚙️ Developer UtilitiesFree
Battery charge capacity calculator
Q from moles and electrons, free
Ssamurai
POST /chem/battery-capacity-moles$0.002
⚙️ Developer UtilitiesFree
Buffer pH after acid addition
new pH from moles of strong acid, free
Ssamurai
POST /chem/buffer-after-addition$0.002
⚙️ Developer UtilitiesFree
Buffer pH calculator
pH from pKa and concentrations, free
Ssamurai
POST /chem/buffer-ph$0.002
⚙️ Developer UtilitiesFree
Half-cell reduction potential calculator
E from [Mⁿ⁺], E°, n
Ssamurai
POST /chem/electrode-potential-reduction$0.002
⚙️ Developer UtilitiesFree
Equilibrium moles from total pressure calculator
gas stoichiometry, free
Ssamurai
POST /chem/equilibrium-moles-from-pressure$0.002
⚙️ Developer UtilitiesFree
Electrochemical equivalents calculator
equivalents from charge Q/F
Ssamurai
POST /chem/equivalents-from-charge$0.002
⚙️ Developer UtilitiesFree
Electrolysis charge calculator
Q=I·t from current and time, free
Ssamurai
POST /chem/faraday-charge$0.002
⚙️ Developer UtilitiesFree
First-order concentration calculator
remaining [A] from k, A₀, t, free
AAspire
POST /chem/first-order-concentration$0.002
⚙️ Developer UtilitiesFree
Concentration cell potential calculator
E from two ion concentrations
Ssamurai
POST /chem/nernst-concentration-cell$0.002
⚙️ Developer UtilitiesFree
Titration unknown concentration
analyte normality N1V1=N2V2
Ssamurai
POST /chem/normality-titration$0.002
⚙️ Developer UtilitiesFree
pH from hydrogen ion concentration calculator
pH = −log₁₀([H+])
Ssamurai
POST /chem/ph-from-hydrogen-ion$0.002
⚙️ Developer UtilitiesFree
Strong base pH calculator
pH from concentration and OH count, free
Ssamurai
POST /chem/ph-strong-base$0.002
⚙️ Developer UtilitiesFree
pKa from buffer pH calculator
acid pKa from pH and base/acid ratio
Ssamurai
POST /chem/pka-from-buffer-ph$0.002
⚙️ Developer UtilitiesFree
pKa from Ka calculator
pKa = −log₁₀(Ka) for acids
Ssamurai
POST /chem/pka-from-ka$0.002
⚙️ Developer UtilitiesFree
pKa + pKb calculator
conjugate pKb from pKa (sum to 14)
Ssamurai
POST /chem/pka-pkb-sum$0.002
⚙️ Developer UtilitiesFree
Titration pH before equivalence calculator
strong acid/base excess pH
Ssamurai
POST /chem/titration-ph-before-equivalence$0.002
⚙️ Developer UtilitiesFree
Zero-order concentration calculator
remaining [A] from k, A₀, t, free
AAspire
POST /chem/zero-order-concentration$0.002
⚙️ Developer UtilitiesFree
Absolute humidity converter
g/m³, grains/ft³, kg/m³ and more, free
Ssamurai
POST /conv/absolute-humidity$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.

Balance
$10.00+

Top up your balance and spend it across web, API and the app. It never expires.