Period Tools vs EZGrader

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 EZGrader
Detail	Period Tools	EZGrader
What it does	Free, accurate cycle and period predictor	Free grading calculator and printable chart for teachers
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	Three grading scales (standard, strict, lenient) Printable grading charts Half-point deductions GPA points column CSV export for spreadsheets Up to 200 questions Offline functionality No data collection
What makes it different	No data collection or server storage Uses standard medical calculation methods Honest about limitations and accuracy No aggressive marketing tactics	Instant calculation with no manual math required Privacy-first design with no student data storage Built specifically for teachers' workflow
Community votes	0	0
DR (Domain Rating by Ahrefs)	15 +1 (up) since last check	1 no change since last check
Trust Flow (Majestic)	20	1
Citation Flow (Majestic)	9	20
Referring domains (Majestic)	77	4

4 details filled in for both companies.