ReactionFlash vs Unreal Chemist
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ReactionFlash
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.
- Learn named chemical reactions
- Understand reaction mechanisms
- View literature examples
- Quiz mode for knowledge testing
- Flashcard interface
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Want to refresh your memory on named chemical reactions before an exam or a group meeting? Get all the details with ReactionFlash(R) as a great way to learn named reactions, understand their mechanisms and view examples published in peer-reviewed literature. Designed and developed in consultation with Professor Dr. Erick M. Carreira of ETH Zürich, the app covers 1'266 named chemical reactions, by far the largest collection of Named Reactions. Professor Carreira has helped ensure that we have all the fundamental reactions that should be part of every chemist’s toolkit: from the best-known ones to the ones only Nobel Prize winners remember! The app is designed like a set of flash cards so it can be used as a learning tool as well as a reference. Each ‘card’ shows the reaction, its mechanism and examples from peer-reviewed, published literature. It also has a quiz mode that lets you test your knowledge. Linking into Reaxys enables you to find the most recent examples of each reaction, many with experimental details. Reaxys delivers experimental facts from the literature, enabling researchers to find the best synthetic routes and conditions. Find out more at https://www.elsevier.com/solutions/reaxys Download the app now and see if you know all the named reactions! Summary: - Learn named reactions - Review and understand mechanisms - Explore examples published in peer-reviewed literature - Take the ReactionFlash quiz and see how much you know If you need support, please contact us at reactionflash@elsevier.com. Reaxys and ReactionFlash are trade marks of Elsevier Limited, used under license.
Unreal Chemist
Explore a virtual chemistry lab on your phone. Mix chemicals, observe reactions, and conduct over 750 unique simulations with more than 150 available substances. Adjust variables like temperature and concentration to understand chemical principles.
- Mix chemicals for reactions
- Burn salts for colorful flames
- Heat elements for color emission
- Adjust reactant concentration and quantity
- Regulate reaction temperature
- Control time flow (slow/fast forward)
- Monitor pH changes with indicators
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Chemistry experiments on your smartphones. You can Mix chemicals to see how they react, Burn salts to colorful flames and Heat elements to see what colors it emits There are 150 plus chemicals available to experiment with and more than 750 unique experiment simulations. Key Highlights - Adjusting the concentration and quantity of the reactants. - Regulate the temperature of the reaction. - Modify temperatures in precipitation reactions and see the effect of temperatures on solubility. - Slow down / Fast forward time. - Check the PH and PH change in a reaction, using Indicators. - Ignite flammable gases formed during reaction. Disclaimer Some reactions you will be doing in Unreal Chemist are extremely dangerous and may cause serious injury if conducted in real word. Even though most of the reactions are accurate to the real world, some reactions may be theoretical since physical verification of some reactions are not completed as of now.
Screenshots
Verdict
The clearest difference is in-app purchases: ReactionFlash at none against Unreal Chemist's 1. ReactionFlash also leads on ads (none vs shown) and rating (4.8 vs 4.5). Unreal Chemist's advantage is update cadence (every 2 weeks vs every 4 months) and iOS requirement (11.0 vs 14.0). On price, review sentiment, ratings volume and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Unreal Chemist sells 1 one-off in-app purchase. ReactionFlash asks for nothing beyond the download.
ReactionFlash holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 41 and 67 respectively. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 73% of Unreal Chemist's.
ReactionFlash ships an update every 4 months, Unreal Chemist every 2 weeks. Both last shipped on October 16, 2026.
| Parameter | ReactionFlash | Unreal Chemist |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (41 ratings) — better | 4.5 (67 ratings) |
| Positive reviews | 80.6% of reviews — better | 73.4% of reviews |
| Number of ratings | 41 | 67 — better |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 37 MB | 342 MB |
| Age rating | 4+ | 4+ |
| Developer | Elsevier Limited | ZipoApps |
Customer experience
ReactionFlash
Unreal Chemist
Bugs and requests
ReactionFlash
Not enough reviews yet to summarise bugs or requests.
Unreal Chemist
Reported bugs
17 issues- Sulfuric acid not dissolving with salts
- Heating solution during titration
- Watch ad for premium session not working
- Mixing game not always working intuitively
- Buttons on iPhone blocked by camera
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- Some metal flame colors don't match description
- Program sometimes locks up
- Music setting resets after closing program
- Some reactions don't show the full formula
- App crashes on opening
- App gets stuck on the home page
- App kicks the user out
- App opens to a blank grey or white screen
- App won't open
- App crashes when it takes too long to open
- Free version has only 2 reactions
- Interface is buggy (e.g., clicking play sends to home page)
Requested features
32 requests- Add more elements (e.g., Mn, H, O, Cl, F, Pb)
- Add more acids (e.g., Chloroauric acid, Vanadic acid, Perrhenic acid)
- Add more bases and solvents (e.g., styrofoam, polystyrene, ethanol, acetone)
- Add gases (e.g., Chlorine, Fluorine, Hydrogen, Oxygen)
- Option to specify amounts of chemicals to add
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- Kid version with simplified instructions
- Add crafting or new science game modes
- Add more glassware and scientific equipment
- Reintroduce feature to see compound information
- Add challenges or daily missions
- Add ability to use previously made chemicals for new reactions
- Add definitions for elements and reactions
- Add a story or background context
- Add more reactions and compounds
- Add liquid elements (e.g., liquid oxygen, hydrogen)
- Add more bases
- Add more solvents
- Add styrofoam/polystyrene
- Add more elements
- Add more acids
- Add more bases
- Add more solvents
- Add more glassware
- Add more scientific equipment
- Add more reactions
- Add more compounds
- Add more elements
- Add more reactions
- Add more compounds
- Add more elements
- Add more reactions
- Add more compounds
In-app purchases
ReactionFlash
No in-app purchases
Unreal Chemist
- Premium Version$5.99
Questions
Is ReactionFlash free?
Is Unreal Chemist free?
Which has better reviews, ReactionFlash or Unreal Chemist?
Do ReactionFlash or Unreal Chemist have ads?
Which is updated more often, ReactionFlash or Unreal Chemist?
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