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
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
Estimate sweat rate from a pre- and post-workout weigh-in
Kkatherine
POST /fitness2/hydration-sweat-rate-estimate$0.002
⚙️ Developer UtilitiesFree
Progressive overload weight plan calculator
Rradia
POST /fitness2/progressive-overload-plan$0.002
⚙️ Developer UtilitiesFree
Estimate distance from step count and stride length
Bbarbara
POST /fitness2/step-count-distance-estimate$0.002
⚙️ Developer UtilitiesFree
Acute:chronic workload ratio calculator and risk zones
Kkatherine
POST /fitness2/training-load-acute-chronic$0.002
⚙️ Developer UtilitiesFree
Copyright Notice Generator
Format a Copyright Line
Rradia
POST /legal2/copyright-notice-generate$0.002
⚙️ Developer UtilitiesFree
Generate a demand letter structure template
Bbarbara
POST /legal2/demand-letter-structure$0.002
⚙️ Developer UtilitiesFree
Generate an employee termination checklist by termination type
Ffrances
POST /legal2/employment-termination-checklist$0.002
⚙️ Developer UtilitiesFree
Generate a GDPR data subject request response checklist
Kkatherine
POST /legal2/gdpr-dsar-response-checklist$0.002
⚙️ Developer UtilitiesFree
List independent contractor classification factors
Bbarbara
POST /legal2/independent-contractor-test-factors$0.002
⚙️ Developer UtilitiesFree
Standard resolutions for an aspect ratio
quick lookup
Rradia
POST /misc2/aspect-ratio-resolution-lookup$0.002
⚙️ Developer UtilitiesFree
Estimate device battery life from battery capacity and current draw
Ffrances
POST /misc2/battery-life-estimate$0.002
⚙️ Developer UtilitiesFree
Convert bra size between US, UK and EU regions
Bbarbara
POST /misc2/bra-size-convert$0.002
⚙️ Developer UtilitiesFree
Parse chess time control notation and calculate game duration
Rradia
POST /misc2/chess-clock-time-control$0.002
⚙️ Developer UtilitiesFree
Determine Chinese zodiac from year
animal and element calculator
Bbarbara
POST /misc2/chinese-zodiac-from-year$0.002
⚙️ Developer UtilitiesFree
Convert clothing sizes between US, UK and EU regions
Ffrances
POST /misc2/clothing-size-convert$0.002
⚙️ Developer UtilitiesFree
Convert data storage units
bytes, KB, MB, GB, TB, and binary units
Rradia
POST /misc2/data-storage-unit-convert$0.002
⚙️ Developer UtilitiesFree
Convert fuel efficiency units
MPG, L/100km and km/L
Mmargaret
POST /misc2/fuel-efficiency-convert$0.002
⚙️ Developer UtilitiesFree
Look up a generation cohort from a birth year
Kkatherine
POST /misc2/generation-cohort-lookup$0.002
⚙️ Developer UtilitiesFree
Estimate file download time from size and connection speed
Mmargaret
POST /misc2/internet-download-time-estimate$0.002
⚙️ Developer UtilitiesFree
Knitting gauge adjustment calculator
convert pattern stitch counts
Kkatherine
POST /misc2/knitting-gauge-convert$0.002
⚙️ Developer UtilitiesFree
Estimate the moon phase for any calendar date
Rradia
POST /misc2/moon-phase-estimate$0.002
⚙️ Developer UtilitiesFree
Calculate name numerology value
Pythagorean name number
Ffrances
POST /misc2/name-numerology-value$0.002
⚙️ Developer UtilitiesFree
Calculate your numerology life path number from a birth date
Mmargaret
POST /misc2/numerology-life-path-number$0.002
⚙️ Developer UtilitiesFree
Oil change due mileage calculator
estimate distance remaining
Ffrances
POST /misc2/oil-change-interval-estimate$0.002
⚙️ Developer UtilitiesFree
Required print DPI calculator
pixels and print size
Mmargaret
POST /misc2/print-resolution-dpi-calc$0.002
⚙️ Developer UtilitiesFree
Convert ring size between regions
US, UK and EU sizes
Mmargaret
POST /misc2/ring-size-convert$0.002
⚙️ Developer UtilitiesFree
Convert a date to Roman numeral format for tattoos and engravings
Bbarbara
POST /misc2/roman-numeral-date-convert$0.002
⚙️ Developer UtilitiesFree
Calculate screen diagonal from dimensions
width, height, and aspect ratio
Kkatherine
POST /misc2/screen-size-diagonal-calc$0.002
⚙️ Developer UtilitiesFree
Subnet usable host calculator
total addresses from CIDR or mask
Kkatherine
POST /misc2/subnet-host-count$0.002
⚙️ Developer UtilitiesFree
Convert tire pressure units between PSI, bar, and kPa
Rradia
POST /misc2/tire-pressure-convert$0.002
⚙️ Developer UtilitiesFree
Decode tire size notation
understand width, ratio, construction and rim
Kkatherine
POST /misc2/tire-size-decode$0.002
⚙️ Developer UtilitiesFree
Validate a VIN check digit
free 17-character VIN checker
Bbarbara
POST /misc2/vin-check-digit-validate$0.002
⚙️ Developer UtilitiesFree
Check WiFi channel overlap for 2.4 GHz channels
Bbarbara
POST /misc2/wifi-channel-overlap-check$0.002
⚙️ Developer UtilitiesFree
Determine zodiac sign from birthdate
month and day lookup
Ffrances
POST /misc2/zodiac-sign-from-date$0.002
⚙️ Developer UtilitiesFree
College fund progress percentage calculator
Rradia
POST /parent/college-fund-progress-percent$0.002
⚙️ Developer UtilitiesFree
Determine diaper size by weight
Rradia
POST /parent/diaper-size-by-weight$0.002
⚙️ Developer UtilitiesFree
Seeded screen-free activity picker for kids by age
Ffrances
POST /parent/screen-free-activity-pick-seeded$0.002
⚙️ Developer UtilitiesFree
Calculate total mortgage interest paid over the full loan term
Kkatherine
POST /realestate/amortization-total-interest$0.002
⚙️ Developer UtilitiesFree
Calculate property cap rate from NOI and market value
Rradia
POST /realestate/capitalization-rate$0.002
⚙️ Developer UtilitiesFree
Calculate Annual HOA Fee Total from Monthly or Quarterly Dues
Ffrances
POST /realestate/hoa-fee-annual-total$0.002
⚙️ Developer UtilitiesFree
Calculate PMI removal threshold from home value and loan balance
Rradia
POST /realestate/pmi-threshold-calc$0.002
⚙️ Developer UtilitiesFree
Annual property tax calculator
assessed value and local rate
Kkatherine
POST /realestate/property-tax-estimate$0.002
⚙️ Developer UtilitiesFree
Calculate refinance break-even months from costs and savings
Bbarbara
POST /realestate/refinance-breakeven$0.002
⚙️ Developer UtilitiesFree
Calculate room square footage from length and width
Mmargaret
POST /realestate/square-footage-from-dimensions$0.002
⚙️ Developer UtilitiesFree
Estimate utility cost per square foot
property calculator
Kkatherine
POST /realestate/utility-cost-per-sqft$0.002
⚙️ Developer UtilitiesFree
Validate API key format
check prefix, length and charset
Rradia
POST /security/api-key-format-validate$0.002
⚙️ Developer UtilitiesFree
CORS header configuration checker
find credential and Vary issues
Mmargaret
POST /security/cors-header-check$0.002
⚙️ Developer UtilitiesFree
Check File Extension Risk Level for Email Attachments
Ffrances
POST /security/file-extension-risk-check$0.002
⚙️ Developer UtilitiesFree
Map data fields to GDPR categories and special-category flags
Bbarbara
POST /security/gdpr-data-category-map$0.002
⚙️ Developer UtilitiesFree
Compare hash algorithm output length and collision security
Bbarbara
POST /security/hash-algorithm-compare$0.002
⚙️ Developer UtilitiesFree
Build an HSTS header value
max-age, subdomains, and preload
Ffrances
POST /security/hsts-header-build$0.002
⚙️ Developer UtilitiesFree
TOTP time window calculator
seconds remaining and window index
Kkatherine
POST /security/otp-time-window-calc$0.002
⚙️ Developer UtilitiesFree
Classify data fields as PII
direct, indirect, or non-PII
Kkatherine
POST /security/pii-field-classify$0.002
⚙️ Developer UtilitiesFree
Parse rate-limit response headers and calculate reset time
Bbarbara
POST /security/rate-limit-header-parse$0.002
⚙️ Developer UtilitiesFree
Estimate secure delete overwrite passes for SSD or HDD
Rradia
POST /security/secure-delete-passes-estimate$0.002
⚙️ Developer UtilitiesFree
Format an SSH key fingerprint as colon hex or Base64
Mmargaret
POST /security/ssh-key-fingerprint-format$0.002
⚙️ Developer UtilitiesFree
Check whether a TLS version is still supported
Ffrances
POST /security/tls-version-support-check$0.002
⚙️ Developer UtilitiesFree
Seeded two-factor backup code generator
Rradia
POST /security/two-factor-backup-codes-generate$0.002
⚙️ Developer UtilitiesFree
Webhook signature verification steps
build a safe HMAC receiver
Mmargaret
POST /security/webhook-signature-verify-steps$0.002
⚙️ Developer UtilitiesFree
Cash denomination calculator
minimum bills and coins, free
Mmargaret
POST /travel2/currency-cash-denomination-split$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.

Recharge balance