茶气 · Cha Qi Calculator

Gongfu tea session strength calculator. Pick a tea, enter grams — get qi score on Lu Tong's Seven Bowls scale, caffeine in milligrams and coffee-cup equivalents, sleep forecast at 23:00, qi direction (lifting to the head or grounding to the body), and TCM nature 性 (cold, cool, neutral, warm, hot).

40 tea varieties: shengs, shus, oolongs, dancongs, yancha, reds, whites, greens, GABA. 5 themes: Lacquer, Paper, Jade, Night, Rosewood. 3 languages: English, Russian, Chinese.

Cha Qi Calculator session screenshot showing qi score, caffeine, TCM nature on iPhone

Tabs

  • Session — pick a tea, set grams, see live qi score and bowl.
  • Goal — pick a state (focus, relaxation, deep dive, cha zui) and get brewing suggestions.
  • Timer — gongfu schedule (10 sec first steep, +5 each) with bronze gong on completion.
  • Diary — save sessions with bowl, score, caffeine, density, steeps, notes.
  • A/B — compare two brews.
  • Teas — manage 40 default teas plus your own. Track personal stash with automatic deduction.

Features

  • Built-in tutorial on 6 slides for newcomers
  • Bronze gong sound for the brewing timer
  • All data stored locally on device
  • Works offline
  • Free, no ads, no tracking

Open the calculator at chaqi.app or download the iOS app from the App Store.