BaziCalculator.ai 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.

BaziCalculator.ai compared with Period Tools
Detail	BaziCalculator.ai	Period Tools
What it does	Free Four Pillars chart and analysis with auditable calculation and optional AI-powered readings	Free, accurate cycle and period predictor
Stage	Not given	Startup
Founded	Not given	2026
Based in	Not given	Not given
Pricing model	Freemium	Freemium
Pricing	Free Bazi chart with no account required. Personal Bazi Report costs $14.99 USD per saved chart, one-time payment with no subscription, available in English, Traditional Chinese or Japanese. Free summary available for saved charts.	All calculators and guides are free. Period Tools Pro (optional): $4.99/month or $19.99/year.
Key features	Four Pillars of Destiny chart generation Day Master identification Five Elements balance analysis Ten Archetypes (Ten Gods) reading Decade-by-decade Life Chapters True solar time correction Shareable chart with OG image Optional AI-powered readings for deeper interpretation Three-pillar analysis when birth time is unknown	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	Calculation before interpretation: deterministic chart generation by rule, with AI only explaining results upon request Privacy-first approach with no required account and transparent data handling Based on classical Chinese texts with auditable, reproducible calculation methods Transparent editorial boundaries separating calculation, tradition, interpretation, and AI True solar time method with historical UTC offset and birth-city longitude for accurate Hour Pillar placement	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)	18 no change since last check	15 no change since last check
Trust Flow (Majestic)	18	20
Citation Flow (Majestic)	25	9
Referring domains (Majestic)	63	77

5 details filled in for both companies.

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