Valence & Formula Practice2026

Offline chemistry formula

Only for iPhone

$0.29 · Designed for iPhone. Not verified for macOS.

iPhone

Valence & Formula Practice is an offline study tool for junior chemistry learners, useful for previewing lessons, correcting homework, and preparing for exams. The app focuses on the common challenge of writing chemical formulas. It provides quick lookup for common element valences, polyatomic ion cards, crisscross method practice, true or false checks, and mistake review. All content stays on the device. No login, no internet connection, and no personal data collection are required. Key features: 1. Quick lookup for common element and ion group valences by name, symbol, and category. 2. Chemical formula writing practice covering oxides, acids, bases, salts, and other common question types. 3. Crisscross method step hints to explain subscript reduction and positive-negative valence balancing. 4. Mistake notebook and mastery statistics that track weak elements and error-prone topics. 5. Offline question bank and focused practice templates for daily drills and exam review.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

Added a feedback feature.

Version 1.1

The developer, Nanjing Yunxiaochuang Technology Co., Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Nanjing Yunxiaochuang Technology Co., Ltd
    Size
    • 1.7 MB
    Category
    • Education
    Compatibility
    Requires iOS 15.6 or later.
    • iPhone
      Requires iOS 15.6 or later.
    • iPod touch
      Requires iOS 15.6 or later.
    • Mac
      Requires macOS 12.5 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 8 more
    • English, French, German, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
    Age Rating
    4+
    Copyright
    • © valenceFormulaTrainer-dh-2026
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

    More by Nanjing Yunxiaochuang Technology Co., Ltd