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Period Tools vs Yuanzi Zhiyi

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 Yuanzi Zhiyi
DetailPeriod Tools logo Period ToolsYuanzi Zhiyi logo Yuanzi Zhiyi
What it doesFree, accurate cycle and period predictor Free Bazi Chart Calculator with True Solar Time and AI Interpretation
StageStartup Not given
Founded2026 Not given
Based inNot given Not given
Pricing modelFreemium Freemium
PricingAll calculators and guides are free. Period Tools Pro (optional): $4.99/month or $19.99/year. Free basic chart, Ten Gods, hidden stems, and luck cycles. Paid one-time reports: complete life reading with 3-year outlook and 90-day action plan (price not specified). Credit packs available for full reports, follow-ups, and advisor chats; first top-up receives 20 bonus credits. Personal AI Adviso
Key features
  • Predicts next 6 periods
  • Calculates ovulation day
  • Identifies fertile window
  • Private on-device tracking
  • Cloud sync for Pro subscribers
  • No signup required
  • Free Four Pillars chart with true solar time calibration and historical time zone handling
  • Hidden Stems and Ten Gods visualization
  • Decade-long and year-by-year luck cycle analysis
  • Register to save multiple charts for family members
  • Complete life reading exploring personality, work, relationships, and life stages
  • Personal AI Advisor for ongoing conversation about chart and life choices
  • 3-year outlook with strategic timing guidance
  • 90-day action plan with tactical focus and concrete steps
  • Solar time calibration tool to verify time zone and boundary adjustments
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 calculation with defined rules allowing verification of chart results
  • True solar time and historical time zone handling for accurate chart generation
  • Separation of chart calculation from interpretation for evidence-based analysis
  • One-time payments with zero automatic renewals or hidden charges
  • Open-source kit for developers to integrate Bazi charting into their applications
Community votes00
DR (Domain Rating by Ahrefs)15 +1 (up) since last check2 no change since last check
Trust Flow (Majestic)201
Citation Flow (Majestic)915
Referring domains (Majestic)7715

5 details filled in for both companies.

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