# ReactionFlash vs R Discovery

The clearest difference is in-app purchases: ReactionFlash at none against R Discovery's 6. ReactionFlash also leads on review sentiment (81% vs 58%). R Discovery's advantage is update cadence (monthly vs every 4 months) and ratings volume (926 vs 42). On price, rating, ads and device support there is nothing between them.

Both are free to download. R Discovery sells 6 in-app purchases, starting at $11.99 per month. ReactionFlash asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for ReactionFlash against 4.8 for R Discovery. That said, the two scores are not equally well evidenced: R Discovery has 926 ratings behind it against 42, so its average is the more settled of the two. Written reviews are what separate them: 81% of ReactionFlash's written reviews are positive against 58% of R Discovery's.

ReactionFlash ships an update every 4 months, R Discovery monthly. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | ReactionFlash | R Discovery |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (42 ratings)](https://appshunter.io/ios/app/reactionflash/id432080813/reviews) | **[4.8 (926 ratings)](https://appshunter.io/ios/app/r-discovery-academic-research/id1508182175/reviews)** |
| Number of ratings | 42 | **926** |
| Positive reviews | **80.6% of reviews** | 57.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | **Free** | Freemium |
| Size | 37 MB | 56 MB |
| Requires iOS | **14.0** | 15 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elsevier Limited](https://appshunter.io/developer/1437273934) | [CACTUS COMMUNICATIONS SERVICES PTE. LTD](https://appshunter.io/developer/1817173784) |

## 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


### R Discovery

[App page](https://appshunter.io/ios/app/r-discovery-academic-research/id1508182175)

Access and discover over 300 million research papers with AI-powered tools. Understand findings, chat with PDFs, and organize your academic library. Stay current in your field with personalized feeds and alerts.

**Highlights:** Discover 300M+ research papers, AI-powered research workflows, Chat with PDFs, Listen to research papers, Personalized research feeds, Organize academic library, Translate research papers

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $11.99 | per month |
| Monthly | $24.99 | per month |
| Monthly | $25.00 | per month |
| Yearly | $69.00 | per year |
| Yearly | $139.99 | per year |
| Yearly | $143.99 | per year |

**What reviewers like**

- 👍 Wonderful site for research professionals
- 🚀 Fantastic app for researchers
- 💡 Provides relevant paper recommendations

**What reviewers complain about**

- 🐛 Slow and choppy performance
- 🐛 Buggy and unreliable features
- 🐛 Difficult to use certain core functions
- 🐛 Downloading PDFs doesn't work

**Reported bugs**

- Home screen takes a long time to load
- Audio translation feature doesn't work
- Buttons are extremely slow
- Switching between dark and light mode is glitchy

**Requested features**

- Add option to view author information in preview
- Enable screen rotation for iPad users
- Add more advanced search functionality
- Allow canceling of export in progress
- Improve integration with Zotero


## Frequently asked questions

### Is ReactionFlash free?

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

### Is R Discovery free?

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

### Which has better reviews, ReactionFlash or R Discovery?

R Discovery is rated higher. ReactionFlash averages 4.8 out of 5 from 42 ratings, while R Discovery averages 4.8 from 926 ratings.

### Do ReactionFlash or R Discovery have ads?

Neither ReactionFlash nor R Discovery shows ads.

### Which is updated more often, ReactionFlash or R Discovery?

ReactionFlash ships an update every 4 months, and R Discovery monthly. Most recently, ReactionFlash was updated on November 1, 2026 and R Discovery on November 7, 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.*