# Backside Attack vs Functional Groups

The clearest difference is in-app purchases: Backside Attack at none against Functional Groups's 1. Backside Attack also leads on ratings volume (74 vs 21) and iOS requirement (9.0 vs 15.0). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Functional Groups 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 4.9 for Functional Groups. Both are backed by a comparable volume of ratings — 74 and 21 respectively. Written reviews are what separate them: 95% of Backside Attack's written reviews are positive against 100% of Functional Groups's.

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

## The numbers

| Metric | Backside Attack | Functional Groups |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (74 ratings)](https://appshunter.io/ios/app/backside-attack/id1278956096/reviews) | [4.9 (21 ratings)](https://appshunter.io/ios/app/functional-groups/id1670252638/reviews) |
| Number of ratings | **74** | 21 |
| Positive reviews | 95.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 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


### Functional Groups

[App page](https://appshunter.io/ios/app/functional-groups/id1670252638)

Master organic chemistry functional groups through an engaging and interactive learning experience. Ideal for students in introductory or advanced courses, MCAT prep, and A-Level chemistry, this app covers dozens of essential groups with practice modes and progress tracking.

**Highlights:** 25+ basic and advanced functional groups, 300+ organic compounds, Multiple practice modes, Customizable study groups, Personalized review, Reference table and definitions, Progress tracking with achievements

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $9.99 | one-time |


## Frequently asked questions

### Is Backside Attack free?

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

### Is Functional Groups free?

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

### Which has better reviews, Backside Attack or Functional Groups?

Backside Attack and Functional Groups are both rated 4.9 out of 5 on the App Store, from 74 and 21 ratings respectively.

### Do Backside Attack or Functional Groups have ads?

Neither Backside Attack nor Functional Groups shows ads.

### Which is updated more often, Backside Attack or Functional Groups?

Backside Attack ships an update every 8 months, and Functional Groups every 4 months. Most recently, Backside Attack was updated on July 4, 2026 and Functional Groups 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.*