GPA Calculate vs Period Tools

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

GPA Calculate compared with Period Tools
Detail	GPA Calculate	Period Tools
What it does	Free online GPA calculator for students, teachers, and parents to track academic performance	Free, accurate cycle and period predictor
Stage	Not given	Startup
Founded	Not given	2026
Based in	US	Not given
Pricing model	Free	Freemium
Pricing	Not given	All calculators and guides are free. Period Tools Pro (optional): $4.99/month or $19.99/year.
Key features	Calculate GPA from course grades and credit hours Support for multiple grading scales Track multiple semesters Grade scale conversion tools GPA to percentage conversion Percentage to grade conversion Test grade calculator Easy grader calculator Grading chart reference	Predicts next 6 periods Calculates ovulation day Identifies fertile window Private on-device tracking Cloud sync for Pro subscribers No signup required
What makes it different	Free access with no cost barriers Quick and accurate GPA calculation Supports US and international grading systems Designed for students, teachers, and parents	No data collection or server storage Uses standard medical calculation methods Honest about limitations and accuracy No aggressive marketing tactics
Community votes	0	0
DR (Domain Rating by Ahrefs)	45 −4 (down) since last check	15 no change since last check
Trust Flow (Majestic)	19	20
Citation Flow (Majestic)	6	9
Referring domains (Majestic)	304	77

4 details filled in for both companies.