# Ion Coexistence Drill 2026 — High school chemistry ion

> High school chemistry ion (iPhone/iPad app by hao du.)

- Source: https://appshunter.io/ios/app/ion-coexistence-drill-2026/id6781091690 (this page in markdown: same URL + `.md`)
- Developer: [hao du](https://appshunter.io/developer/1454457703)
- Category: Education
- Price: $0.29
- Age rating: 4+
- Requires: iOS 15.6 · 1 MB
- Languages: English, French, German, Japanese, Korean, Portuguese, Russian, Chinese, Spanish
- Released: 2026-06-18
- Data updated: 2026-08-07
- User reviews in markdown: https://appshunter.io/ios/app/ion-coexistence-drill-2026/id6781091690/reviews.md

## What is Ion Coexistence Drill 2026?

Ion Coexistence is an offline practice tool for high school chemistry. It helps students quickly decide whether ions can coexist in large amounts under common conditions such as acidic, alkaline, colorless, excess reagent, and redox environments.

The app includes rules for common precipitates, gases, weak electrolytes, complex formation, and redox reactions. It supports focused practice by question type, mistake review, rule card favorites, and accuracy statistics. All data is stored locally on the device, with no login and no internet required. It is suitable for after-class practice, exam review, and organizing error causes.


## Version history (last 2 releases)

### 1.1 — 2026-08-04

Added a feedback feature.

### 1.0 — 2026-06-18

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-07.*