The Concrete Calculator 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.

The Concrete Calculator compared with Yuanzi Zhiyi
Detail	The Concrete Calculator	Yuanzi Zhiyi
What it does	Free concrete slab cost estimator with material, labor and site prep breakdowns	Free Bazi Chart Calculator with True Solar Time and AI Interpretation
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	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	Material, labor and delivery cost breakdowns Pre-calculated costs for common slab sizes Multiple calculator tools including rebar, yard, bag and footing No sign-up required, data stays in browser	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	Built by a single independent developer focused on accessible, ad-free calculation tools Transparent calculations using standard formulas so users see exactly how each number is produced Multiple concrete calculation tools sharing one consistent calculation engine	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 votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	2 no change since last check
Trust Flow (Majestic)	0	1
Citation Flow (Majestic)	16	15
Referring domains (Majestic)	4	15

4 details filled in for both companies.

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