Period Tools vs GQ Calc

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

Period Tools compared with GQ Calc
Detail	Period Tools	GQ Calc
What it does	Free, accurate cycle and period predictor	Fast, transparent material calculators for real projects
Stage	Startup	Not given
Founded	2026	Not given
Based in	Not given	US
Pricing model	Freemium	Free
Pricing	All calculators and guides are free. Period Tools Pro (optional): $4.99/month or $19.99/year.	Not given
Key features	Predicts next 6 periods Calculates ovulation day Identifies fertile window Private on-device tracking Cloud sync for Pro subscribers No signup required	Editable assumptions based on actual product labels Visible net quantity, waste, and package rounding Field guides for project measurement and material planning Support for US and metric measurements
What makes it different	No data collection or server storage Uses standard medical calculation methods Honest about limitations and accuracy No aggressive marketing tactics	Shows net quantity, waste allowance, and packaging rounding visibly together for easy comparison with product labels No account, sales call, or hidden formula required Fifty practical free calculators covering six major project categories Editable product-specific assumptions rather than fixed formulas Separate calculators for similar materials with different inputs and purchase results
Community votes	0	0
DR (Domain Rating by Ahrefs)	15 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	20	3
Citation Flow (Majestic)	9	25
Referring domains (Majestic)	77	12

4 details filled in for both companies.