ReactionFlash vs Chemist 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
Read full descriptionHide full description
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.
Chemist Calc
This app serves as a smart chemistry calculator for converting between moles and grams. It also provides a comprehensive periodic table with element specifications and unit conversion tools.
- Mole to gram conversion
- Gram to mole conversion
- Periodic table with element specifications
- Unit conversion
- Learn chemistry signs
Read full descriptionHide full description
Chemist Calc is a very smart chemist calculator. You can calculate moles to gram or gram to moles. You also have the whole periodic table elements with specification inside. You can convert between different units and also learn about all chemistry signs.
Screenshots
Verdict
The clearest difference is in-app purchases: ReactionFlash at none against Chemist Calc's 1. ReactionFlash also leads on ratings volume (41 vs 1) and update cadence (every 4 months vs every 9 months). Chemist Calc's advantage is rating (5.0 vs 4.8). On price, ads, monetization model 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. Chemist Calc sells 1 one-off in-app purchase. ReactionFlash asks for nothing beyond the download.
Chemist Calc 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 1, so its average is the more settled of the two.
ReactionFlash ships an update every 4 months, Chemist Calc every 9 months. The most recent releases landed on October 7, 2026 and September 30, 2026 respectively.
| Parameter | ReactionFlash | Chemist Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (41 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 80.6% of reviews | — |
| Number of ratings | 41 — better | 1 |
| Update frequency | Every 4 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 37 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Elsevier Limited | ilan TETRUASHVILI |
Customer experience
ReactionFlash
Chemist Calc
In-app purchases
ReactionFlash
No in-app purchases
Chemist Calc
- Remove Ad's$0.99
Questions
Is ReactionFlash free?
Is Chemist Calc free?
Which has better reviews, ReactionFlash or Chemist Calc?
Do ReactionFlash or Chemist Calc have ads?
Which is updated more often, ReactionFlash or Chemist Calc?
Other comparisons















