Ohmlark vs CostCal Pro

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 CostCal Pro
Detail	Ohmlark	CostCal Pro
What it does	Electronics calculators for makers	Enter every cost, pick the profit you want, get the exact sales price
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Freemium
Pricing	Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.	Free plan forever with 5 saved calculations and 5 exports per month. Starter at $49/year with 200 saved calculations and unlimited exports. Premium at $99/year with unlimited saved calculations and 3 sites. Agency at $199/year with unlimited saved calculations and 25 sites. All plans are yearly in U
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	Exact sales price calculation from costs Cost breakdown and donut chart VAT, rounding and price floors Bulk profit calculator for 1, 10, 100 or 500 units Discount simulator Break-even orders per month calculator Save and reopen calculations PDF and CSV export Catalogue check for loss detection WooCommerce and Shopify integration
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	Exact decimal math with no rounding drift Solves circular fee dependencies exactly Free plan never expires
Community votes	0	0
DR (Domain Rating by Ahrefs)	1 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	0	0
Referring domains (Majestic)	0	0

5 details filled in for both companies.

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