# ReactionFlash vs RSS Chemicals

The clearest difference is review sentiment: ReactionFlash at 81% against RSS Chemicals's 13%. ReactionFlash also leads on rating (4.8 vs 2.2) and ratings volume (41 vs 13). RSS Chemicals's advantage is update cadence (every 5 weeks vs every 4 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ReactionFlash holds the better App Store score, 4.8 against 2.2. Both are backed by a comparable volume of ratings — 41 and 13 respectively. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 13% of RSS Chemicals's.

ReactionFlash ships an update every 4 months, RSS Chemicals every 5 weeks. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | ReactionFlash | RSS Chemicals |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (41 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews)** | [2.2 (13 ratings)](https://appshunter.io/ios/app/rss-chemicals/id1067020786/reviews) |
| Number of ratings | **41** | 13 |
| Positive reviews | **80.6% of reviews** | 12.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 37 MB | 66 MB |
| Requires iOS | **14.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [The Regents of the University of California (UCOP)](https://appshunter.io/developer/916274264) |

## 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


### RSS Chemicals

[App page](https://appshunter.io/ios/app/rss-chemicals/id1067020786)

Manage your chemical inventory with this cloud-based tool. Easily track containers using barcodes, access safety information, and share chemicals with research groups while controlling access. A complementary web app offers advanced features.

**Highlights:** Barcode scanning for inventory tracking, Chemical and safety information auto-population, Create chemical networks for sharing, Access control for shared chemicals, Advanced inventory search, Complementary web application

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

**In-app purchases:** none


## Frequently asked questions

### Is ReactionFlash free?

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

### Is RSS Chemicals free?

RSS Chemicals is free to download, with no in-app purchases.

### Which has better reviews, ReactionFlash or RSS Chemicals?

ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while RSS Chemicals averages 2.2 from 13 ratings.

### Do ReactionFlash or RSS Chemicals have ads?

Neither ReactionFlash nor RSS Chemicals shows ads.

### Which is updated more often, ReactionFlash or RSS Chemicals?

ReactionFlash ships an update every 4 months, and RSS Chemicals every 5 weeks. Most recently, ReactionFlash was updated on September 21, 2026 and RSS Chemicals on September 17, 2026.

---

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