# ODYSSEY VSEPR Theory

> Interactive 3D VSEPR theory models for chemistry education. (iPhone/iPad app by Wavefunction, Inc..)

- Source: https://appshunter.io/ios/app/odyssey-vsepr-theory/id869643629 (this page in markdown: same URL + `.md`)
- Developer: [Wavefunction, Inc.](https://appshunter.io/developer/534726809)
- Category: Education, Reference
- Price: $3.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 9.0 · 23 MB
- Languages: American English
- Released: 2014-05-07
- Data updated: 2026-07-09
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/odyssey-vsepr-theory/id869643629/reviews.md

## What is ODYSSEY VSEPR Theory?

Why are some triatomic molecules linear (carbon dioxide, hydrogen cyanide) and others are bent (water, sulfur dioxide)? And why is the bond angle in water (~105°) smaller than that in sulfur dioxide (~119°)? Valence Shell Electron Pair Repulsion (VSEPR) theory provides surprisingly simple explanations in terms of the electron pairs that surround the central atom of a given molecule. VSEPR theory is described in detail in every introductory chemistry book.

The ODYSSEY VSEPR Theory app provides three-dimensional models of 50 small molecules and ions as well as a set of generic models that illustrate the conceivable geometries of the theory. Each model can be moved and manipulated with simple touch gestures. Bond lengths and bond angles can be queried.

Users can pick from multiple model styles (such as Ball and Spoke or Space Filling), request a schematic display of lone pair positions, and show the molecular dipole arrow. A glossary, comments section, and a set of multiple-choice questions (with randomized options) are also available.

Most learners of chemistry are visually oriented. Complementing the presentation found in any introductory textbook, ODYSSEY VSEPR Theory enables exploration of one of the most fundamental concepts in general chemistry—molecular shape.

## Key features

- Interactive 3D molecular models
- Adjustable model styles
- Measure bond lengths and angles
- Lone pair and dipole moment visualization
- Multiple-choice quizzes
- Glossary and comments section


## Frequently asked questions about ODYSSEY VSEPR Theory

### What is ODYSSEY VSEPR Theory?

ODYSSEY VSEPR Theory is an educational application that provides interactive 3D models to help users understand Valence Shell Electron Pair Repulsion theory and molecular shapes. It allows for manipulation of models, measurement of bond angles, and includes quizzes.

### How does ODYSSEY VSEPR Theory help with learning?

The app complements textbook learning by offering a visual and interactive way to explore molecular shapes, which is particularly beneficial for visually oriented chemistry learners. Users can directly manipulate and examine 50 small molecules and ions.

### What kind of models are available in ODYSSEY VSEPR Theory?

The app offers 3D models of 50 small molecules and ions, along with generic models illustrating VSEPR theory geometries. Users can choose from styles like Ball and Spoke or Space Filling, and can also request schematic displays of lone pair positions.

### Can I measure aspects of the molecules in ODYSSEY VSEPR Theory?

Yes, users can query bond lengths and bond angles directly from the 3D models. This feature allows for precise examination of molecular structures and their dimensions.

### Does ODYSSEY VSEPR Theory have quizzes?

Yes, the app includes a set of multiple-choice questions designed to test understanding of VSEPR theory. The options for these questions are randomized to provide a varied learning experience.

### What devices is ODYSSEY VSEPR Theory compatible with?

ODYSSEY VSEPR Theory is currently supported on iPads. It was released on May 7, 2014, and its latest version is 1.0.5, last updated on July 29, 2022.

### How much does ODYSSEY VSEPR Theory cost?

ODYSSEY VSEPR Theory is a paid application, priced at $3.99. There are no in-app purchases or advertisements.

### What is the age rating for ODYSSEY VSEPR Theory?

The app has an age rating of 4+, making it suitable for a wide range of users, including younger students beginning their chemistry education.

## Version history (last 5 releases)

### 1.0.5 — 2022-07-29

iOS 15 fixes- minor content updates

### 1.0.4 — 2018-12-07

Compatibility fix for iOS 10 and later.

### 1.0.3 — 2016-01-21

- iPad Pro compatibility
- Quarter point penalty for incorrect answers removed

### 1.0.2 — 2014-12-03

- Compatibility fixes for iOS 8.1
- Touch interface atom picking improved

### 1.0.1 — 2014-10-10

- Fix for retina displays under iOS 8
- Improved presentation

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## More apps by Wavefunction, Inc.

- [iSpartan](https://appshunter.io/ios/app/ispartan/id534726646)
- [ODYSSEY Atomic Orbitals](https://appshunter.io/ios/app/odyssey-atomic-orbitals/id830980902)
- [ODYSSEY Electron Sharing](https://appshunter.io/ios/app/odyssey-electron-sharing/id849135421)
- [ODYSSEY Resonance](https://appshunter.io/ios/app/odyssey-resonance/id849142769)
- [ODYSSEY Polar Bonds- Molecules](https://appshunter.io/ios/app/odyssey-polar-bonds-molecules/id869677755)

All apps by Wavefunction, Inc.: https://appshunter.io/developer/534726809

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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 2026-07-09.*