Ohmlark vs Calculator Heaven

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Ohmlark compared with Calculator Heaven
Detail	Ohmlark	Calculator Heaven
What it does	Electronics calculators for makers	Quick, free converters and calculators for everyday use with no sign-up required
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Freemium	Free
Pricing	Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.	Not given
Key features	Resistor Color Code: read 4, 5 and 6-band resistors or find bands for a value LED Resistor: pick the current-limiting resistor and power rating Voltage Divider: output voltage, loading effect, or solve R2 for target Vout RC Filter: cutoff frequency, time constant and attenuation at any frequency LC Resonance: resonant frequency, characteristic impedance and Q 555 Timer: astable frequency/duty cycle and monostable pulse width Battery Life: runtime from capacity, active/sleep current and duty cycle PCB Trace Width: IPC-2221 trace width for current and temperature rise Electronics Unit Converter: SI prefixes, AWG to mm², mil to mm, dBm to mW, oz copper	Unit converters for length, weight and distance Cooking and baking converters including cups to grams and oven temperature Health calculators for BMI, body fat, calorie and pregnancy Math calculators including scientific, fractions and geometry Date and time calculators for age, birthdays and time zones Everyday calculators for GPA, concrete, flooring and home projects Calculations performed entirely in browser with no data transmission Internationally agreed unit conversion definitions
What makes it different	Real E-series resistor values, not ideal numbers Engineering notation input and result sharing as links No ads, no tracking, no sign-up for free calculators Whole-device BOM costing and battery-life summary in Pro Works on phone at the bench	No sign-up or clutter required Full transparency showing how calculations are derived Every calculator tested against worked examples before launch Privacy-first with calculations done entirely in browser
Community votes	0	0
DR (Domain Rating by Ahrefs)	1 +1 (up) since last check	3 no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	0	11
Referring domains (Majestic)	0	3

4 details filled in for both companies.

More alternatives to Ohmlark More alternatives to Calculator Heaven