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Online Ruler vs TangoEra

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

Online Ruler compared with TangoEra
DetailOnline Ruler logo Online RulerTangoEra logo TangoEra
What it doesMeasure anything on your screen with pixel-perfect accuracy Written BaZi readings: reflective, not fatalistic
StageNot given Not given
FoundedNot given Not given
Based inNot given HK
Pricing modelFree Paid
PricingNot given Written Reading: $49 USD one-time payment, delivered within 48 hours. Live Session: $249 (not yet available, waitlist only). Companion: planned for 2027. Free Element Check available.
Key features
  • Smart Auto-Detect identifies your device from a database of 100+ profiles
  • Three calibration methods: auto-detect, screen diagonal, and credit card
  • Place rulers on any edge of the screen in any combination
  • Click-to-measure distances in any direction
  • Live cursor position tracking
  • Dark mode with automatic system preference detection
  • Support for four measurement units: cm, mm, inches, and pixels
  • Four-pillars chart calculation from birth time and location
  • Day Master element identification
  • Ten Gods analysis showing chart structure
  • Element balance assessment
  • Three-year cycle map with themes
  • 2,000-word PDF written report
  • 14 days of email follow-up questions
  • Solar-term calendar method
  • Free Element Check for Day Master only
  • 48-hour delivery guarantee
What makes it different
  • No installation required—runs entirely in your web browser
  • Achieves near pixel-perfect accuracy typically within 0.5mm for well-calibrated screens
  • Completely free with no ads, account, or limitations
  • Calibration saved locally so no need to recalibrate on each visit
  • Works on tablets and mobile devices with touchscreen support
  • Explicitly non-fatalistic interpretation: describes tendencies and cycles, not predictions or verdicts
  • Every interpretation names the chart characters it comes from for verification
  • Cultural and reflective approach avoiding fear or urgency
  • No supernatural claims or remedies to purchase
  • 30-day money-back guarantee with rewrite option
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)4 +3 (up) since last check12 no change since last check
Trust Flow (Majestic)04
Citation Flow (Majestic)1719
Referring domains (Majestic)46

4 details filled in for both companies.

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