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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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
Series-parallel resistor network calculator
equivalent resistance
K
POST /elec/resistors-mixed$0.002⚙️ Developer UtilitiesFree
Watt-hours from power and time calculator
K
POST /elec/watt-hours-power-time$0.002⚙️ Developer UtilitiesFree
NTC thermistor temperature from resistance calculator
beta model
K
POST /elec/ntc-thermistor-temp$0.002⚙️ Developer UtilitiesFree
Six-band resistor color code calculator with temperature coefficient
B
POST /elec/resistor-color-6band$0.002⚙️ Developer UtilitiesFree
RC Discharging Voltage at Time Calculator
K
POST /elec/rc-discharge-voltage$0.002⚙️ Developer UtilitiesFree
Supercapacitor backup time calculator
estimate load runtime
K
POST /elec/supercap-backup-time$0.002⚙️ Developer UtilitiesFree
Coupled inductors in series calculator
aiding and opposing
B
POST /elec/coupled-inductors-series$0.002⚙️ Developer UtilitiesFree
Parallel plate capacitor area calculator
size plates from capacitance
B
POST /elec/parallel-plate-area$0.002⚙️ Developer UtilitiesFree
Toroid inductance calculator
L = μ₀μᵣN²A/l
K
POST /elec/toroid-inductance$0.002⚙️ Developer UtilitiesFree
AC form factor and crest factor calculator
RMS, average and peak
B
POST /elec/form-crest-factor$0.002⚙️ Developer UtilitiesFree
Impedance polar to rectangular converter
resistance and reactance
K
POST /elec/impedance-polar-rect$0.002⚙️ Developer UtilitiesFree
Three-phase power calculator
watts from voltage, current and PF
B
POST /elec/three-phase-power$0.002⚙️ Developer UtilitiesFree
Peak voltage from RMS calculator for sine waves
K
POST /elec/vpeak-from-vrms$0.002⚙️ Developer UtilitiesFree
Series diode voltage drop calculator
total drop and load voltage
K
POST /elec/diode-voltage-drop$0.002⚙️ Developer UtilitiesFree
LED resistor by color calculator
red, green, blue, yellow and white
B
POST /elec/led-resistor-by-color$0.002⚙️ Developer UtilitiesFree
Common Emitter Voltage Gain Calculator
B
POST /elec/common-emitter-gain$0.002⚙️ Developer UtilitiesFree
MOSFET Drain Current in Saturation Calculator
K
POST /elec/mosfet-drain-current$0.002⚙️ Developer UtilitiesFree
Rectifier peak inverse voltage calculator
diode PIV rating
K
POST /elec/rectifier-piv$0.002⚙️ Developer UtilitiesFree
BCD to binary converter
decode packed 8421 BCD
B
POST /elec/bcd-to-binary$0.002⚙️ Developer UtilitiesFree
Binary division calculator
quotient, remainder and restoring steps
K
POST /elec/binary-division$0.002⚙️ Developer UtilitiesFree
Ratio to gain dB calculator
voltage and power conversion
K
POST /elec/ratio-to-gain-db$0.002⚙️ Developer UtilitiesFree
Binary Counter Maximum Count Calculator
States and Modulus
K
POST /elec/counter-max-count$0.002⚙️ Developer UtilitiesFree
Binary decoder outputs calculator
address lines and range
B
POST /elec/decoder-outputs$0.002⚙️ Developer UtilitiesFree
Bit Rotate Calculator
Circular Left and Right Rotation
B
POST /elec/rotate-bits$0.002⚙️ Developer UtilitiesFree
Buck-boost converter duty cycle calculator
inverting supply
K
POST /elec/buckboost-duty$0.002⚙️ Developer UtilitiesFree
Charge pump voltage calculator
ideal multiplier output
B
POST /elec/charge-pump$0.002⚙️ Developer UtilitiesFree
Clock frequency and period calculator
frequency, period, and cycles
K
POST /elec/clock-period$0.002⚙️ Developer UtilitiesFree
555 astable resistor and capacitor calculator
B
POST /elec/ne555-astable-components$0.002⚙️ Developer UtilitiesFree
Peukert Battery Capacity Calculator for Lead-Acid Batteries
B
POST /elec/peukert-capacity$0.002⚙️ Developer UtilitiesFree
Solar array energy sizing calculator
required panel wattage
K
POST /elec/solar-array-sizing$0.002⚙️ Developer UtilitiesFree
Junction temperature calculator
power, ambient and thermal resistance
K
POST /elec/junction-temperature$0.002⚙️ Developer UtilitiesFree
Parallel conductor ampacity calculator
combined current capacity
B
POST /elec/parallel-conductors$0.002⚙️ Developer UtilitiesFree
Resistive attenuator pad calculator
matched pi and tee resistor values
B
POST /elec/resistive-attenuator$0.002⚙️ Developer UtilitiesFree
Return loss to SWR calculator for antenna tuning
K
POST /elec/return-loss-to-swr$0.002⚙️ Developer UtilitiesFree
Spherical law of cosines distance calculator
B
POST /geo/law-of-cosines-distance$0.002⚙️ Developer UtilitiesFree
Nearest point on a great-circle segment
spherical calculator
K
POST /geo/nearest-point-on-segment$0.002⚙️ Developer UtilitiesFree
Earth arc length from central angle calculator
B
POST /geo/arc-length-from-angle$0.002⚙️ Developer UtilitiesFree
Geodesic segment length calculator
latitude and longitude
K
POST /geo/segment-length$0.002⚙️ Developer UtilitiesFree
True to magnetic bearing calculator
subtract declination
B
POST /geo/true-to-magnetic$0.002⚙️ Developer UtilitiesFree
Convex Hull Perimeter Calculator for Cartesian Points
K
POST /geo/convex-hull-perimeter$0.002⚙️ Developer UtilitiesFree
Geodesic polygon area calculator on the WGS84 ellipsoid
K
POST /geo/geodesic-polygon-area$0.002⚙️ Developer UtilitiesFree
Polygon interior angles from ordered vertices
B
POST /geo/polygon-interior-angles$0.002⚙️ Developer UtilitiesFree
Spherical triangle area calculator from latitude and longitude
B
POST /geo/triangle-geodesic-area$0.002⚙️ Developer UtilitiesFree
Degrees decimal minutes to DMS converter
split DDM into seconds
K
POST /geo/ddm-to-dms$0.002⚙️ Developer UtilitiesFree
Normalize bearing to 0–360 degrees
B
POST /geo/normalize-bearing$0.002⚙️ Developer UtilitiesFree
UTM zone number from longitude
Norway and Svalbard exceptions
K
POST /geo/utm-zone-from-lon$0.002⚙️ Developer UtilitiesFree
Approximate H3 hex index
map coordinates to a hex cell
B
POST /geo/h3-cell-approx$0.002⚙️ Developer UtilitiesFree
Recover a shortened Plus Code from nearby coordinates
B
POST /geo/plus-code-recover$0.002⚙️ Developer UtilitiesFree
Quadkey to Tile XYZ Converter
Decode X, Y and Zoom
K
POST /geo/quadkey-to-tile$0.002⚙️ Developer UtilitiesFree
Three meter grid index
numeric address from latitude and longitude
K
POST /geo/what3words-grid-index$0.002⚙️ Developer UtilitiesFree
Miller cylindrical projection calculator for latitude and longitude
K
POST /geo/miller-project$0.002⚙️ Developer UtilitiesFree
Stereographic projection calculator
latitude/longitude to X/Y
B
POST /geo/stereographic-project$0.002⚙️ Developer UtilitiesFree
ECEF to local ENU converter
east, north, up coordinates
K
POST /geo/ecef-to-enu$0.002⚙️ Developer UtilitiesFree
Lambert azimuthal equal-area projection calculator
B
POST /geo/lambert-azimuthal$0.002⚙️ Developer UtilitiesFree
Course Over Ground from Vectors
COG and SOG Calculator
K
POST /geo/course-over-ground$0.002⚙️ Developer UtilitiesFree
Equal Time Point Calculator for Flight Planning
B
POST /geo/equal-time-point$0.002⚙️ Developer UtilitiesFree
Travel time from distance and speed calculator
B
POST /geo/travel-time$0.002⚙️ Developer UtilitiesFree
Descent Gradient and Top of Descent Calculator
B
POST /geo/descent-gradient$0.002⚙️ Developer UtilitiesFree
Dogleg route distance calculator
waypoint detour penalty
K
POST /geo/dogleg-distance$0.002⚙️ Developer UtilitiesFree
Three-dimensional distance
ground distance and elevation calculator
B
POST /geo/distance-3d$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.