# Backside Attack vs Heterocycles

The clearest difference is in-app purchases: Backside Attack at none against Heterocycles's 1. Backside Attack also leads on ratings volume (74 vs 2) and iOS requirement (9.0 vs 15.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Heterocycles sells 1 one-off in-app purchase. Backside Attack asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Backside Attack against 5.0 for Heterocycles. That said, the two scores are not equally well evidenced: Backside Attack has 74 ratings behind it against 2, so its average is the more settled of the two.

Backside Attack ships an update every 8 months, Heterocycles every 11 months. The most recent releases landed on July 4, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Backside Attack | Heterocycles |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (74 ratings)](https://appshunter.io/ios/app/backside-attack/id1278956096/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/heterocycles/id6445909269/reviews)** |
| Number of ratings | **74** | 2 |
| Positive reviews | 95.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 11 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 178 MB | 17 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Element26, Inc.](https://appshunter.io/developer/973213639) | [Clarity Applications](https://appshunter.io/developer/1646120472) |

## What reviewers say

### Backside Attack

[App page](https://appshunter.io/ios/app/backside-attack/id1278956096)

This educational game helps students grasp fundamental organic chemistry concepts, specifically focusing on the SN2 reaction. It explores key variables like leaving group ability, nucleophilicity, steric factors, and solvent effects to build a strong foundation in chemistry.

**Highlights:** Learn SN2 reaction mechanics, Explore leaving group ability, Understand nucleophilicity, Analyze steric factors, Study solvent effects, Earn points with Check Yourself +50, Unlock Chem Yourself feature

**In-app purchases:** none


### Heterocycles

[App page](https://appshunter.io/ios/app/heterocycles/id6445909269)

Master the names and applications of organic chemistry's heterocycles. This interactive app covers over 75 compounds with hundreds of examples and personalized review modes. Track your progress with achievements and learn about their roles in medicine and biology.

**Highlights:** 75+ heterocycles, Hundreds of examples, Multiple practice modes, Personalized review, Reference table, Achievements

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


## Frequently asked questions

### Is Backside Attack free?

Backside Attack is free to download, with no in-app purchases.

### Is Heterocycles free?

Heterocycles is free to download, with in-app purchases available.

### Which has better reviews, Backside Attack or Heterocycles?

Heterocycles is rated higher. Backside Attack averages 4.9 out of 5 from 74 ratings, while Heterocycles averages 5.0 from 2 ratings.

### Do Backside Attack or Heterocycles have ads?

Neither Backside Attack nor Heterocycles shows ads.

### Which is updated more often, Backside Attack or Heterocycles?

Backside Attack ships an update every 8 months, and Heterocycles every 11 months. Most recently, Backside Attack was updated on July 4, 2026 and Heterocycles on September 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*