Comparison

ReactionFlash vs ChemLab

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

ChemLab

Features
Read full description

Welcome to ChemLab, the ultimate pocket-sized virtual laboratory! Whether you're a science enthusiast, a student, or just someone who loves explosive puzzle games, ChemLab gives you the freedom to experiment with chemical reactions safely right from your device. The Ultimate Science Experiment App. Developed by ShekTech, ChemLab combines accurate physics, satisfying drag-and-drop mechanics, and realistic visual and audio effects to bring the magic of chemistry to life. EXPLORE 20 ENGAGING LEVELS Test your knowledge and problem-solving skills across 20 unique challenges. From basic thermodynamics to complex redox reactions, oxidation, and neutralization! Mix the right ingredients, apply heat, and manage the clock to achieve your scientific objectives. INFINITE SANDBOX MODE Unlock the Sandbox Mode and let your imagination run wild! Access all the chemicals, metals, and liquids in the game. Mix whatever you want just to see what happens. Will it change color, bubble, or trigger a violent reaction? The choice is yours. TIME CONTROL MECHANICS Chemistry takes time, but not in ChemLab! Use the interactive Time Controller to speed up long reactions. Fast-forward hours of rusting or dehydration into just a few seconds. REALISTIC SENSORY EXPERIENCE Enjoy highly polished haptic feedback and dynamic audio effects—from the pouring of liquids to the hissing of boiling water, the bubbling of gas, and the shattering of overheated flasks. FEATURES: • 20 challenging and educational puzzle levels. • Free-play Sandbox Mode with dozens of unlockable elements. • Realistic chemical reactions, color changes, and thermodynamics. • Built-in recipe book and hints to help you when you're stuck. • Clean, distraction-free interface. Download ChemLab today and start mixing! (Note: ChemLab is a simulation designed for entertainment and educational conceptualization. Always practice actual chemistry safely in a supervised physical environment). Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ReactionFlash4 screens
ChemLab4 screens

Verdict

The call

The clearest difference is ads: ReactionFlash at none against ChemLab's shown. ChemLab's advantage is update cadence (every 5 days vs every 4 months). On price, in-app purchases, device support and iOS requirement 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.

UpkeepUpdate frequency

ReactionFlash ships an update every 4 months, ChemLab every 5 days. The most recent releases landed on October 23, 2026 and October 8, 2026 respectively.

Scorecard2 real differences · 8 level
ReactionFlash versus ChemLab: the parameters behind the verdict, then further details
ParameterReactionFlashChemLab
PriceFreeFree
Rating4.8 (42 ratings) — better—
Positive reviews80.6% of reviews—
Number of ratings42 — better—
Update frequencyEvery 4 monthsEvery 5 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS14.0 — better15.1
Further details — not scored
Size37 MB100 MB
Age rating4+4+
DeveloperElsevier LimitedAbhishek Chauhan

In-app purchases

None

ReactionFlash

No in-app purchases

None

ChemLab

No in-app purchases

Questions

Is ReactionFlash free?
ReactionFlash is free to download, with no in-app purchases.
Is ChemLab free?
ChemLab is free to download, with no in-app purchases.
Do ReactionFlash or ChemLab have ads?
ChemLab shows ads; ReactionFlash does not.
Which is updated more often, ReactionFlash or ChemLab?
ReactionFlash ships an update every 4 months, and ChemLab every 5 days. Most recently, ReactionFlash was updated on October 23, 2026 and ChemLab on October 8, 2026.

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