# Backside Attack vs Search PubChem

Backside Attack and Search PubChem both sit at 4.9 stars, but that hides the real split: 95% of Backside Attack's written reviews are positive against 75% of Search PubChem's. Backside Attack also leads on ratings volume (74 vs 5) and iOS requirement (9.0 vs 26.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Backside Attack against 5.0 for Search PubChem. That said, the two scores are not equally well evidenced: Backside Attack has 74 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 95% of Backside Attack's written reviews are positive against 75% of Search PubChem's.

Backside Attack ships an update every 8 months, Search PubChem every 9 months. The most recent releases landed on July 4, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Backside Attack | Search PubChem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (74 ratings)](https://appshunter.io/ios/app/backside-attack/id1278956096/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/search-pubchem/id1369742632/reviews)** |
| Number of ratings | **74** | 5 |
| Positive reviews | **95.5% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 9 months |
| Monetization | Free | Free |
| Size | 178 MB | 9 MB |
| Requires iOS | **9.0** | 26.0 |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, Mac, Vision Pro |
| Age rating | 4+ | 17+ |
| Developer | [Element26, Inc.](https://appshunter.io/developer/973213639) | [Jae-Seung Lee](https://appshunter.io/developer/1146296876) |

## 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


### Search PubChem

[App page](https://appshunter.io/ios/app/search-pubchem/id1369742632)

Access and manage chemical compound data from the PubChem database. Search for over 111 million compounds, view molecular formulas, weights, and structures, and create and track custom solutions with detailed composition information.

**Highlights:** Search PubChem database, View molecular formula, weight, and structure, Store compound information, Create and manage custom solutions, Track solution composition in grams and moles, Display 3D compound structures, Share solution data via CSV

**In-app purchases:** none


## Frequently asked questions

### Is Backside Attack free?

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

### Is Search PubChem free?

Search PubChem is free to download, with no in-app purchases.

### Which has better reviews, Backside Attack or Search PubChem?

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

### Do Backside Attack or Search PubChem have ads?

Neither Backside Attack nor Search PubChem shows ads.

### Which is updated more often, Backside Attack or Search PubChem?

Backside Attack ships an update every 8 months, and Search PubChem every 9 months. Most recently, Backside Attack was updated on July 4, 2026 and Search PubChem on June 1, 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.*