Comparison

ReactionFlash vs Chem AI

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

Chem AI

Instantly solve any chemistry problem with step-by-step explanations. Upload or photograph your questions, and get detailed solutions for various chemistry topics, from high school to advanced research. Offers a free trial before subscription.

Highlights
  • Photo recognition for chemistry problems
  • Step-by-step solution explanations
  • Supports high school to doctoral research topics
  • Detailed math solutions
  • Copy and share solutions
Features
Read full description

Solve any chemistry problem ASAP with Chem AI, a step-by-step chemistry solver app! Download now for FREE. Got a tricky chemistry question? Need instant step-by-step explanations? Chem AI is here to save you. We got you covered for multiple choice, word, diagram, math, or any chemistry problem. Just upload or take a photo of your chemistry problem, and Chem AI instantly recognizes it and helps you solve it with a thorough explanation. KEY FEATURES - Upload or take a photo of a handwritten or digital chemistry problem. - Copy and share the detailed solutions. - Topics cover all types of chemistry, from high school to doctoral research. - Math solutions are provided with detailed steps. - We provide a free trial to test out the app. Subscription Required To continue accessing all features of Chem AI, a subscription is required. By using Chem AI, you accept our Terms of Use and Privacy Policy. Privacy Policy: https://zipoapps.com/chemaiios/privacy/ Terms: https://zipoapps.com/chemaiios/terms/

Screenshots

ReactionFlash4 screens
Chem AI4 screens

Verdict

The call

The clearest difference is review sentiment: ReactionFlash at 81% against Chem AI's 20%. ReactionFlash also leads on in-app purchases (none vs 16) and ads (none vs shown). Chem AI's advantage is update cadence (fortnightly vs every 4 months) and ratings volume (818 vs 41). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Chem AI sells 15 in-app purchases, starting at $0.99 per 7 days. ReactionFlash asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ReactionFlash holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Chem AI has 818 ratings behind it against 41, so its average is the more settled of the two. Written reviews point the same way: 81% of ReactionFlash's written reviews are positive against 20% of Chem AI's.

UpkeepUpdate frequency

ReactionFlash ships an update every 4 months, Chem AI fortnightly. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.

Scorecard8 real differences · 2 level
ReactionFlash versus Chem AI: the parameters behind the verdict, then further details
ParameterReactionFlashChem AI
PriceFreeFree
Rating4.8 (41 ratings) — better4.4 (818 ratings)
Positive reviews80.6% of reviews — better20.0% of reviews
Number of ratings41818 — better
Update frequencyEvery 4 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPodiPhone, iPad
Requires iOS14.0 — better16.0
Further details — not scored
Size37 MB149 MB
Age rating4+4+
DeveloperElsevier LimitedZipoApps

Customer experience

ReactionFlash

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

Chem AI

All ratings818 ratings
Positive83.5%
Neutral3.1%
Negative13.4%
Written reviews40 reviews
Positive20.0%
Neutral5.0%
Negative75.0%

Bugs and requests

ReactionFlash

Not enough reviews yet to summarise bugs or requests.

Chem AI

Reported bugs

2 issues
  • Freezes or goes blank when trying to get answers
  • Incompatible with some chemistry problems

Requested features

3 requests
  • Improve accuracy for organic chemistry and physical chemistry
  • Add step-by-step explanations for free users
  • Improve subscription management and cancellation process

In-app purchases

None

ReactionFlash

No in-app purchases

15 purchases

Chem AI

Subscriptions15
  • Unlimited Access3 Days trial$0.997 Days
  • Unlimited Access3 Days trial$2.997 Days
  • Unlimited Access3 Days trial$3.997 Days
Show 12 more
  • Unlimited Access3 Days trial$4.997 Days
  • Unlimited Access3 Days trial$5.997 Days
  • Chem AI - Chem Solver Weekly3 Days trial$5.997 Days
  • Unlimited Access3 Days trial$6.997 Days
  • Unlimited Access3 Days trial$7.997 Days
  • Unlimited Access3 Days trial$8.997 Days
  • Unlimited Access3 Days trial$9.991 Year
  • Unlimited Access3 Days trial$19.991 Month
  • Unlimited Access3 Days trial2 variants$29.991 Year
  • Chem AI - Chem Solver Yearly$34.991 Year
  • Unlimited Access3 Days trial$39.991 Year
  • Unlimited Access3 Days trial$49.991 Year

Questions

Is ReactionFlash free?
ReactionFlash is free to download, with no in-app purchases.
Is Chem AI free?
Chem AI is free to download, with in-app purchases available.
Which has better reviews, ReactionFlash or Chem AI?
ReactionFlash is rated higher. ReactionFlash averages 4.8 out of 5 from 41 ratings, while Chem AI averages 4.4 from 818 ratings.
Do ReactionFlash or Chem AI have ads?
Chem AI shows ads; ReactionFlash does not.
Which is updated more often, ReactionFlash or Chem AI?
ReactionFlash ships an update every 4 months, and Chem AI fortnightly. Most recently, ReactionFlash was updated on September 21, 2026 and Chem AI on September 13, 2026.

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