
Jade Codex: Chinese Almanac
Daily I Ching & Four Pillars
About
Explore ancient wisdom and gain personal insights through a digital I Ching oracle. Cast hexagrams, interpret dreams with AI, and understand your birth hexagram. All readings are processed on-device for maximum privacy.
What's New in Jade Codex
2.0
September 14, 2026
Version 2.0 — The Personal Almanac Jade Codex is now a 黄历. Today opens on a complete traditional almanac day page: the lunar date and 干支, the 建除 day officer, 值神, the lunar mansion, 彭祖百忌, the clash animal, the auspicious directions, and the day's full 宜 and 忌 columns — reproduced from 《钦定协纪辨方书》 and computed on your iPhone from solar-term astronomy. Free, complete, and the same for every reader. Then it reads that day against your own Four Pillars chart, and tells you in one line why each recommendation fits you and not someone else. Also new in 2.0: • Share today's almanac as a card. • "Today's element in Jade Codex" — Siri and Spotlight, with nothing to set up. • A sticker pack: eight trigrams, twelve earthly branches, five elements — 25 stickers for Messages. • Widgets now carry the almanac, and refresh at the turn of each 时辰 rather than on a fixed clock. • Your Day Master, month season and favourable element are now free, above the paywall. • A Sources & Lineage screen naming every classical text the almanac draws on. • Mark an 宜 item done and the day quietly remembers — no score, no streak, no notification. • The lunar calendar now runs 1900–2100, and every lunar-month start in that range is corrected — including 春节 2027.
MoreSubscriptions & In-App Purchases
Monthly
Full access to all premium features, billed monthly.
Developer apps
FAQ
What is Yao?
Yao is a digital I Ching oracle that allows you to cast hexagrams, interpret dreams using AI, and explore ancient Chinese wisdom. It offers personalized readings and insights into your birth hexagram.
How does Yao interpret dreams?
Yao uses on-device AI to analyze your dream descriptions against over 500 traditional Chinese dream symbols, providing deeply personal meanings. You can also build a Dream Bestiary and keep a journal of your dreams.
Is Yao free to use?
Yao is free to download and offers basic functionality. Premium features, including unlimited daily casts and full dream interpretations, are available through subscription plans starting at $4.99 per month.
Does Yao have ads?
No, Yao does not contain advertisements. The app is free to use with optional in-app purchases for premium features.
What devices does Yao support?
Yao is available for iPhone and iPad, supporting accessibility features like VoiceOver and Dynamic Type.
How often is Yao updated?
The app was last updated on May 11, 2026, with version 1.3. This indicates a recent update, suggesting ongoing development and support.
What are the subscription options for Yao?
Yao offers a monthly subscription for $4.99 and an annual subscription for $29.99, unlocking the complete Oracle experience and premium features.
Is my data private with Yao?
Yes, Yao prioritizes privacy by using on-device Apple Intelligence for all readings and interpretations. Your personal data and readings never leave your device.











