Period Tools vs Owned Outright

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 Owned Outright
Detail	Period Tools	Owned Outright
What it does	Free, accurate cycle and period predictor	Mortgage payoff calculators that start from your loan's current balance
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	Extra payment calculator for monthly, yearly or lump-sum additions Amortization schedule with payment breakdown Mortgage payoff date calculator Principal vs interest crossover calculation Prepay vs invest comparison PMI removal timing and acceleration Mortgage recast calculator Refinance break-even analysis Biweekly payment calculator ARM calculator for adjustable-rate mortgages
What makes it different	No data collection or server storage Uses standard medical calculation methods Honest about limitations and accuracy No aggressive marketing tactics	Starts calculations from today's current loan balance instead of original amount Handles multiple payment patterns simultaneously Results round like a real lender for accuracy All calculations run locally with no data sent to servers Verified against published figures with automated testing
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	0
Citation Flow (Majestic)	9	4
Referring domains (Majestic)	77	1

4 details filled in for both companies.

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