Period Tools vs ProRataWise

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 ProRataWise
Detail	Period Tools	ProRataWise
What it does	Free, accurate cycle and period predictor	Pro rata calculator for insurance premiums
Stage	Startup	Not given
Founded	2026	Not given
Based in	Not given	Not given
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	Calculates earned and unearned premium by policy dates Shows daily rate and pro rata factors Displays full calculation formula with your numbers Handles leap years with actual calendar days Two cancellation-date rules: first day not covered or last covered day Provides total policy days, earned days, and unearned days Estimates straight-line pro rata return premium Calculations run locally in your browser
What makes it different	No data collection or server storage Uses standard medical calculation methods Honest about limitations and accuracy No aggressive marketing tactics	Transparent straight-line pro rata calculation without fees, penalties or taxes Accounts for leap years and actual calendar days automatically Shows the complete formula filled in with your own policy numbers
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	1
Citation Flow (Majestic)	9	17
Referring domains (Majestic)	77	12

4 details filled in for both companies.