Comparison

Molecule World vs Cardify

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

Head to head
About

Molecule World

Explore interactive 3D models of molecules, proteins, and DNA. This educational tool allows users to manipulate structures, experiment with visualization styles, and learn about chemical properties. Ideal for students and science enthusiasts of all ages.

Highlights
  • Interactive 3D molecule manipulation
  • Experiment with drawing and coloring styles
  • View and control molecular sequences (protein, DNA, RNA)
  • Identify elements and investigate molecular properties
  • Capture images of molecular structures
  • Explore themed collections of molecules
Features
Read full description

A modern 3D molecular workspace that makes exploring the connections between sequence, structure, and function accessible to a new generation of scientists, educators, and students. Molecule World 5.0 is built for how molecular structures are explored and designed today. View, compare, align, and explore experimental structures and computationally generated models together. Compare normal and mutant proteins, investigate structural differences, and connect sequence changes to their 3D consequences. Explore proteins, DNA, RNA, and small molecules on iPhone, iPad, and Mac. Rotate, zoom, and pan through structures with high-quality interactive 3D visualization. Molecule World brings structure viewing, sequence analysis, molecular comparison, and educational tools together in one app. EXPERIMENTAL AND COMPUTATIONAL STRUCTURES Open structures from X-ray crystallography, cryo-EM, and NMR alongside computationally generated models. Search RCSB PDB, NCBI MMDB, and PubChem by ID or keyword and download structures directly into your library. SEQUENCE AND STRUCTURE The sequence viewer on iPad and Mac shows every chain as a row of residues colored to match the 3D view. Copies of a molecule line up in shared columns, while superimposed models read down the same columns. See sequence differences in context and investigate their structural consequences. POWERFUL VISUALIZATION Choose Spacefill, Ball & Stick, Tubes, Ribbon, Surface, or Wire Surface representations. Color by element, secondary structure, chain, sequence, assembly, conserved domain, residue type, charge, hydrophobicity, or B-factor. Show proteins, nucleic acids, or chemical components alone, or reduce chains to their backbone or Cα trace. A color key shows what is on screen, while the Info card reports what a structure is, how it was determined, and what it contains. YOUR LIBRARY Keep structures in folders, synced through iCloud Drive or stored on the device. Filter your library by atoms, chains, resolution, confidence values, file type, source database, models, or scenes. MOLECULE WORLD PRO Pro adds tools for creating and saving molecular content. Selections: select residues in the sequence, search by variant, range, or motif, select residue neighbors, then style, color, hide, and lock them. Scenes: save named views, including selections, styles, and camera position, inside the structure file. Step through scenes to guide an exploration or create a presentation. Model sets: superimpose structures and compare how closely they align. Compare experimental structures, predicted models, variants, or alternative conformations, and save the model set and its comparison data for sharing. Collections: package structures, models, scenes, and descriptions into a single file. Hide selected structures for exercises and optionally lock the collection for distribution. Pro also includes undo and redo and high-resolution image capture. It is a single in-app purchase with no subscription and can be shared with Family Sharing. TEACH SEQUENCE, STRUCTURE, AND FUNCTION Build collections around a biological question. Give students related structures, variants, or predicted models and let them investigate the differences themselves. Use scenes to guide an exploration, hide structures for unknown-structure exercises, and move between aligned sequence and 3D structure to connect sequence changes with their structural consequences. Everything created with Pro opens in the free Molecule World viewer on iPhone, iPad, and Mac. Students and colleagues can explore collections, step through scenes and model sets, change views, and save images for assignments and presentations. BUILT FOR THE APPLE ECOSYSTEM Molecule World runs as a unified app on iPhone, iPad, and Mac. Optional iCloud support keeps your library available across devices. Molecule World is developed by Digital World Biology LLC, with support from National Science Foundation awards IIP 1315426 and DUE 2055036.

About

Cardify

This app uses AI to help students and parents organize incorrect answers and knowledge points. Simply take a photo or select an image from your album, confirm the question's scope, and the app will create a clear record for review and tracking.

Highlights
  • Photo and album import of incorrect answers
  • AI-powered question scope confirmation
  • Detailed review of answers and solutions
  • Original photo retention
  • Organization by date, subject, and knowledge point
  • Analysis of weak subjects and knowledge points
Features
Read full description

Turn a difficult homework question into a clearer next step. Photograph a question from homework, a worksheet or a practice test. Select the complete problem, compare your work with a step-by-step explanation, and keep the result for later review. SCAN AND UNDERSTAND - Capture a question with the camera or import an image from Photos. - Select the question area before recognition. - Review the question, your original work, the solution steps and mistake analysis together. - Keep the original image to check details. If recognition or an explanation is incorrect, submit a correction request. ORGANIZE AND REVIEW - Find saved questions by subject, topic and date. - See which subjects and topics appear most often in your mistakes. - Open selected topic review questions where available. Try solving first, reveal the explanation, then mark your understanding. RETURN TO PAPER PRACTICE - Select saved mistakes or available review questions for printing. - Preview the worksheet and export it as a PDF or print through the system sharing options. - Choose whether to include solution steps and mistake analysis when printing saved mistakes. Made for students and families using iPhone and iPad. Cardify helps you understand and revisit mistakes; it is not a replacement for a teacher. AI recognition and explanations can be incorrect, so check important details. SUBSCRIPTIONS AND IN-APP PURCHASES - Cardify offers weekly (1 week), monthly (1 month) and yearly (1 year) auto-renewable membership plans. - Some features, including topic flashcard review, require an active membership. Benefits, AI usage allowances or credits, subscription duration and the local price are shown on the purchase screen before confirmation. - Payment is charged to your Apple Account when the purchase is confirmed. If a trial or introductory offer is displayed, its purchase-screen terms apply. - Subscriptions renew automatically unless cancelled at least 24 hours before the current period ends. Your account may be charged for renewal within the 24 hours before the current period ends. - Manage or cancel your subscription in Settings > your name > Subscriptions, or in your App Store account settings. - One-time purchases, if offered, do not renew automatically. Included credits and usage rules are displayed before purchase. Privacy Policy: https://blynkai.app/cardify/privacy Cardify Terms of Service: https://blynkai.app/cardify/terms Apple Standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Molecule World4 screens
Cardify4 screens

Verdict

The call

The clearest difference is update cadence: Cardify at every 2 weeks against Molecule World's every 2 months. Cardify also leads on monetization model (freemium vs paid) and ratings volume (12 vs 4). Molecule World's advantage is review sentiment (100% vs 89%). On price, rating, ads and in-app purchases 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. Molecule World sells 1 one-off in-app purchase and Cardify sells 7 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Molecule World against 5.0 for Cardify. Both are backed by a comparable volume of ratings — 4 and 12 respectively. Written reviews are what separate them: 100% of Molecule World's written reviews are positive against 89% of Cardify's.

UpkeepUpdate frequency

Molecule World ships an update every 2 months, Cardify every 2 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
Molecule World versus Cardify: the parameters behind the verdict, then further details
ParameterMolecule WorldCardify
PriceFreeFree
Rating5.0 (4 ratings)5.0 (12 ratings)
Positive reviews100.0% of reviews — better88.9% of reviews
Number of ratings412 — better
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFreemium — better
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.616.0 — better
Further details — not scored
Size16 MB13 MB
Age rating4+4+
DeveloperDigital World Biology LLCBeijing Huishuo Mobile Technology Co.,Ltd.

Customer experience

Molecule World

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Cardify

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews27 reviews
Positive88.9%
Neutral0.0%
Negative11.1%

In-app purchases

1 purchases

Molecule World

One-time1
  • Molecule World Pro$29.99
7 purchases

Cardify

Subscriptions3
  • Weekly3 Days trial$9.997 Days
  • Monthly Pro$19.991 Month
  • Yearly$99.991 Year
One-time4
  • 100 Credits$1.99
  • 300 Credits$4.99
  • 500 Credits$7.99
Show 1 more
  • Lifetime$199.99

Questions

Is Molecule World free?
Molecule World is free to download, with in-app purchases available.
Is Cardify free?
Cardify is free to download, with in-app purchases available.
Which has better reviews, Molecule World or Cardify?
Molecule World and Cardify are both rated 5.0 out of 5 on the App Store, from 4 and 12 ratings respectively.
Do Molecule World or Cardify have ads?
Neither Molecule World nor Cardify shows ads.
Which is updated more often, Molecule World or Cardify?
Molecule World ships an update every 2 months, and Cardify every 2 weeks. Most recently, Molecule World was updated on October 24, 2026 and Cardify on October 28, 2026.

Other comparisons