Comparison

ReactionFlash vs Molecular Constructor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Learn named chemical reactions
  • Understand reaction mechanisms
  • View literature examples
  • Quiz mode for knowledge testing
  • Flashcard interface
Features
Read 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.

About

Molecular Constructor

Create and optimize 3D molecular models. This free software allows users to design molecules and refine their geometry simultaneously. A more advanced desktop version is also available.

Highlights
  • Build molecules in 3D
  • Design molecular structures
  • Optimize geometry
  • Free software
  • Desktop version available
Features
Read full description

Molecular Constructor is a free 3D modeling software for building molecules. Using this application user can design a molecule and optimize its geometry at the same time. The more advanced desktop version can be found at the project website: http://molconstr.com/

Screenshots

ReactionFlash4 screens
Molecular Constructor3 screens

Verdict

The call

The clearest difference is rating: ReactionFlash at 4.8 against Molecular Constructor's 3.9. ReactionFlash also leads on update cadence (every 4 months vs every 12 months). Molecular Constructor's advantage is iOS requirement (12.0 vs 14.0). On price, review sentiment, ratings volume and ads 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

ReactionFlash holds the better App Store score, 4.8 against 3.9. Both are backed by a comparable volume of ratings — 41 and 52 respectively. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 75% of Molecular Constructor's.

UpkeepUpdate frequency

ReactionFlash ships an update every 4 months, Molecular Constructor every 12 months. The most recent releases landed on September 21, 2026 and August 29, 2026 respectively.

Scorecard3 real differences · 7 level
ReactionFlash versus Molecular Constructor: the parameters behind the verdict, then further details
ParameterReactionFlashMolecular Constructor
PriceFreeFree
Rating4.8 (41 ratings) — better3.9 (52 ratings)
Positive reviews80.6% of reviews — better75.0% of reviews
Number of ratings4152 — better
Update frequencyEvery 4 months — betterEvery 12 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS14.012.0 — better
Further details — not scored
Size37 MB10 MB
Age rating4+4+
DeveloperElsevier LimitedAlexander Teplukhin

Customer experience

ReactionFlash

All ratings41 ratings
Positive95.1%
Neutral2.4%
Negative2.4%
Written reviews31 reviews
Positive80.6%
Neutral6.5%
Negative12.9%

Molecular Constructor

All ratings52 ratings
Positive73.1%
Neutral7.7%
Negative19.2%
Written reviews60 reviews
Positive75.0%
Neutral15.0%
Negative10.0%

In-app purchases

None

ReactionFlash

No in-app purchases

None

Molecular Constructor

No in-app purchases

Questions

Is ReactionFlash free?
ReactionFlash is free to download, with no in-app purchases.
Is Molecular Constructor free?
Molecular Constructor is free to download, with no in-app purchases.
Which has better reviews, ReactionFlash or Molecular Constructor?
ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Molecular Constructor averages 3.9 from 52 ratings.
Do ReactionFlash or Molecular Constructor have ads?
Neither ReactionFlash nor Molecular Constructor shows ads.
Which is updated more often, ReactionFlash or Molecular Constructor?
ReactionFlash ships an update every 4 months, and Molecular Constructor every 12 months. Most recently, ReactionFlash was updated on September 21, 2026 and Molecular Constructor on August 29, 2026.

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