# ReactionFlash vs Search PubChem

The clearest difference is rating: Search PubChem at 5.0 against ReactionFlash's 4.8. Search PubChem also leads on device support (4 vs 2). ReactionFlash's advantage is ratings volume (41 vs 5) and update cadence (every 4 months vs every 9 months). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Search PubChem holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ReactionFlash has 41 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 81% of ReactionFlash's written reviews are positive against 75% of Search PubChem's, so the app with the better star average is not the one people write more warmly about.

ReactionFlash ships an update every 4 months, Search PubChem every 9 months. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | ReactionFlash | Search PubChem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/search-pubchem/id1369742632/reviews)** |
| Number of ratings | **41** | 5 |
| Positive reviews | **80.6% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free | Free |
| Size | 37 MB | 9 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 17+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [Jae-Seung Lee](https://appshunter.io/developer/1146296876) |

## What reviewers say

### ReactionFlash

[App page](https://appshunter.io/ios/app/reactionflash/id432080813)

This app serves as a comprehensive flashcard-style learning tool for named chemical reactions. It provides detailed information on reaction mechanisms and examples from scientific literature, with a quiz mode to test user knowledge.

**Highlights:** Learn named chemical reactions, Understand reaction mechanisms, View literature examples, Quiz mode for knowledge testing, Flashcard interface

**Features:** macOS Compatibility

**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 ReactionFlash free?

ReactionFlash 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, ReactionFlash or Search PubChem?

Search PubChem is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Search PubChem averages 5.0 from 5 ratings.

### Do ReactionFlash or Search PubChem have ads?

Neither ReactionFlash nor Search PubChem shows ads.

### Which is updated more often, ReactionFlash or Search PubChem?

ReactionFlash ships an update every 4 months, and Search PubChem every 9 months. Most recently, ReactionFlash was updated on September 21, 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.*