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.
REST APILive
EmailLive
Webforhosting.com/kitLive
TelegramLive
iOS & AndroidBuilding
WhatsAppComing
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
Grams of product from moles calculator
n×MM in grams, free
S
POST /chem/grams-of-product-from-moles$0.002⚙️ Developer UtilitiesFree
Grams of solute for molarity calculator
M×V×MM in grams, free
S
POST /chem/grams-solute-for-molarity$0.002⚙️ Developer UtilitiesFree
Instantaneous rate from tangent calculator
|Δc|/Δt from two nearby, free
S
POST /chem/instantaneous-rate$0.002⚙️ Developer UtilitiesFree
Equilibrium constant at new temperature
van't Hoff K2 from K1, free
S
POST /chem/k-at-new-temperature$0.002⚙️ Developer UtilitiesFree
Kp from partial pressures calculator
equilibrium Kp = ∏P^ν, free
S
POST /chem/kp-from-partial-pressures$0.002⚙️ Developer UtilitiesFree
Ksp from solubility calculator
Ksp = ∏(νᵢ·s)^νᵢ from molar s, free
S
POST /chem/ksp-from-solubility$0.002⚙️ Developer UtilitiesFree
Le Chatelier pressure shift calculator
equilibrium vs pressure, free
S
POST /chem/le-chatelier-pressure-shift$0.002⚙️ Developer UtilitiesFree
Limiting reagent from masses calculator
two reactants, free
S
POST /chem/limiting-reactant-two$0.002⚙️ Developer UtilitiesFree
Mass percent to molality calculator
w/w % + MM → mol/kg, free
S
POST /chem/mass-percent-to-molality$0.002⚙️ Developer UtilitiesFree
Mass percent to ppm converter
% w/w → ppm & ppb, free
S
POST /chem/mass-percent-to-ppm$0.002⚙️ Developer UtilitiesFree
Mass to gas volume calculator
V = mRT/(MP) ideal gas, free
S
POST /chem/mass-to-gas-volume$0.002⚙️ Developer UtilitiesFree
Mass-to-mass stoichiometry calculator
product mass from reactant, free
S
POST /chem/mass-to-mass-stoich$0.002⚙️ Developer UtilitiesFree
mg/L to molarity calculator
concentration + molar mass → mol/L, free
S
POST /chem/mg-per-liter-to-molarity$0.002⚙️ Developer UtilitiesFree
Molar concentration calculator
c = n/V in mol/L, free
S
POST /chem/molar-concentration$0.002⚙️ Developer UtilitiesFree
Molar mass from boiling point elevation
M = Kb·g / (ΔTb·kg), free
S
POST /chem/molar-mass-from-bp-elevation$0.002⚙️ Developer UtilitiesFree
Molar mass from gas density calculator
M = ρRT/P (ideal gas), free
S
POST /chem/molar-mass-from-gas-density$0.002⚙️ Developer UtilitiesFree
Molarity from moles and volume calculator
M = n/V in mol/L, free
S
POST /chem/molarity-from-moles-volume$0.002⚙️ Developer UtilitiesFree
Molarity to molality calculator
M, density, MM → mol/kg, free
S
POST /chem/molarity-to-molality$0.002⚙️ Developer UtilitiesFree
Mole fraction to mass percent calculator
free binary conversion
S
POST /chem/mole-fraction-to-mass-percent$0.002⚙️ Developer UtilitiesFree
Osmolarity calculator
Osm = i·M in osmoles per liter, free
S
POST /chem/osmolarity$0.002⚙️ Developer UtilitiesFree
Oxygen for combustion calculator
moles O₂ for CₓHᵧ hydrocarbon, free
S
POST /chem/oxygen-required-combustion$0.002⚙️ Developer UtilitiesFree
Particles to moles calculator
n = N / N_A, free
S
POST /chem/particles-to-moles$0.002⚙️ Developer UtilitiesFree
Percent composition calculator
mass % from formula, free
S
POST /chem/percent-composition$0.002⚙️ Developer UtilitiesFree
Percent to molarity calculator
mass % + density → mol/L, free
S
POST /chem/percent-to-molarity$0.002⚙️ Developer UtilitiesFree
Percent water in hydrate calculator
mass % H₂O from hydrate &, free
S
POST /chem/percent-water-in-hydrate$0.002⚙️ Developer UtilitiesFree
Strong acid pH calculator
pH = −log₁₀(C) monoprotic, free
S
POST /chem/ph-strong-acid$0.002⚙️ Developer UtilitiesFree
PPB concentration calculator
parts per billion by mass, free
S
POST /chem/ppb-concentration$0.002⚙️ Developer UtilitiesFree
PPM from molarity calculator
M, molar mass, density → ppm, free
S
POST /chem/ppm-from-molarity$0.002⚙️ Developer UtilitiesFree
Equilibrium direction predictor
Q vs K shift direction, free
S
POST /chem/q-vs-k-direction$0.002⚙️ Developer UtilitiesFree
Rate constant from half-life calculator
k = ln(2)/t½, free
S
POST /chem/rate-constant-from-half-life$0.002⚙️ Developer UtilitiesFree
Graham's law calculator
relative effusion rate √(M₂/M₁), free
S
POST /chem/rate-of-effusion$0.002⚙️ Developer UtilitiesFree
Reaction order from rate data calculator
n = log(r₁/r₂)/log(c₁/c₂), free
S
POST /chem/reaction-order-from-rates$0.002⚙️ Developer UtilitiesFree
Solution boiling point calculator
Tb = T0 + i·Kb·m, free
S
POST /chem/solution-boiling-point$0.002⚙️ Developer UtilitiesFree
Specific heat from calorimetry calculator
c = Q/(m·ΔT), free
S
POST /chem/specific-heat-from-calorimetry$0.002⚙️ Developer UtilitiesFree
Stock solution volume calculator
V1 from C1, C2, V2 dilution, free
S
POST /chem/stock-solution-volume$0.002⚙️ Developer UtilitiesFree
Theoretical moles of product calculator
limiting moles × mole ratio, free
S
POST /chem/theoretical-moles-product$0.002⚙️ Developer UtilitiesFree
Theoretical yield from limiting reactant calculator
moles, free
S
POST /chem/theoretical-yield-from-limiting$0.002⚙️ Developer UtilitiesFree
Total ion concentration calculator
C = i·M from salt molarity, free
S
POST /chem/total-ion-concentration$0.002⚙️ Developer UtilitiesFree
Total pressure of gas mixture calculator
Dalton P = ΣPᵢ, free
S
POST /chem/total-pressure-gas-mixture$0.002⚙️ Developer UtilitiesFree
Van der Waals pressure calculator
P = nRT/(V−nb) − an²/V², free
S
POST /chem/van-der-waals-pressure$0.002⚙️ Developer UtilitiesFree
Vapor pressure molar mass calculator
M from relative lowering, free
S
POST /chem/vapor-pressure-molar-mass$0.002⚙️ Developer UtilitiesFree
Volume percent calculator
% v/v from solute and solution, free
S
POST /chem/volume-percent$0.002⚙️ Developer UtilitiesFree
Volume-to-volume gas stoichiometry calculator
V₂ from V₁ and coeffs, free
S
POST /chem/volume-to-volume-gas-stoich$0.002⚙️ Developer UtilitiesFree
Work of gas expansion calculator
W = −P_ext·ΔV, free
S
POST /chem/work-gas-expansion$0.002⚙️ Developer UtilitiesFree
Zero-order half-life calculator
t½ = [A]₀/(2k), free
S
POST /chem/zero-order-half-life$0.002⚙️ Developer UtilitiesFree
WCAG contrast ratio checker
AA/AAA for normal and large text
S
POST /color/contrast$0.002⚙️ Developer UtilitiesFree
RGB to hex converter
0–255 channels to #RRGGBB, free
S
POST /color/rgb-hex$0.002⚙️ Developer UtilitiesFree
RGB to HSV converter
0–255 channels to hue, saturation, value, free
S
POST /color/rgb-hsv$0.002⚙️ Developer UtilitiesFree
RGB to LAB converter
sRGB channels to CIE L*a*b* (D65), free
S
POST /color/rgb-lab$0.002⚙️ Developer UtilitiesFree
Color temperature to RGB
Kelvin 1000–40000 to sRGB, free
S
POST /color/temperature$0.002⚙️ Developer UtilitiesFree
Tetradic color scheme generator
four hues from one hex, free
S
POST /color/tetradic$0.002⚙️ Developer UtilitiesFree
Combinations with repetition
multiset C(n+r−1, r), free
S
POST /combo/combinations-with-repetition$0.002⚙️ Developer UtilitiesFree
Handshake problem calculator
n choose 2 and inverse, free
S
POST /combo/handshake$0.002⚙️ Developer UtilitiesFree
Monotone lattice paths on an a×b grid
C(a+b, a), free
S
POST /combo/lattice-paths$0.002⚙️ Developer UtilitiesFree
Unsigned Stirling numbers of the first kind
c(n,k) cycles, free
S
POST /combo/stirling-first$0.002⚙️ Developer UtilitiesFree
Butter measurement converter
sticks, tbsp, cups, grams free
S
POST /cook/butter$0.002⚙️ Developer UtilitiesFree
Cake tin size converter
round ↔ square by area, in & cm free
S
POST /cook/cake-tin$0.002⚙️ Developer UtilitiesFree
Honey cups to grams converter
tbsp & density free
S
POST /cook/honey$0.002⚙️ Developer UtilitiesFree
Pints to liters converter
US & imperial pint free
S
POST /cook/pints-liters$0.002⚙️ Developer UtilitiesFree
Teaspoons to ml converter
US & metric tsp free
S
POST /cook/tsp-ml$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.