ReactionFlash vs Gas Law Calc
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.
Gas Law Calc
This chemistry calculator simplifies complex gas law calculations, including the ideal gas law and its variations. It also offers an element lookup with electron configuration and energy levels, plus tools for temperature, pressure, and volume conversions and dilution calculations.
- Ideal gas law calculations
- Charles' Law and Avogadro's Law
- Element lookup with electron configuration
- Temperature, pressure, volume conversions
- Dilution calculator
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Gas Law Calc is an ad free straightforward, easy-to-use chemistry calculator. Easily work the ideal gas law and its derivatives, such as Charles' Law, Avogadro's Law, and more. Also included is a simple element look up to see electron configuration, energy levels, molecular weight. And lastly, convert between temperatures, pressures, and volumes, as well as a dilution calculator.
Screenshots
Verdict
The clearest difference is rating: ReactionFlash at 4.8 against Gas Law Calc's 4.2. ReactionFlash also leads on ratings volume (42 vs 5). Gas Law Calc's advantage is update cadence (weekly vs every 4 months) and review sentiment (100% vs 81%). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
ReactionFlash holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: ReactionFlash has 42 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 100% of Gas Law Calc'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, Gas Law Calc weekly. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.
| Parameter | ReactionFlash | Gas Law Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (42 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 80.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 42 — better | 5 |
| Update frequency | Every 4 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 40 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Elsevier Limited | Jonathan Nakhla |
Customer experience
ReactionFlash
Gas Law Calc
In-app purchases
ReactionFlash
No in-app purchases
Gas Law Calc
No in-app purchases
Questions
Is ReactionFlash free?
Is Gas Law Calc free?
Which has better reviews, ReactionFlash or Gas Law Calc?
Do ReactionFlash or Gas Law Calc have ads?
Which is updated more often, ReactionFlash or Gas Law Calc?
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