Comparison

CellAtlas vs Thea

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

Head to head
About

CellAtlas

Explore blood cell morphology with expert-written lectures and a vast image database. Test your knowledge with an engaging quiz game designed for efficient learning.

Highlights
  • Blood cell morphology guide
  • Expert-written mini lectures
  • Extensive cell image database
  • CellQuiz game
  • Knowledge testing
Features
Read full description

Welcome to the CellAtlas Application - your guide to blood cell morphology. CellAtlas contains mini lectures written by hematology experts complemented by an extensive cell image database. The App also includes a game, CellQuiz. A fun and efficient way to test your knowledge in cell morphology. CellAtlas is a product from the medical technology company CellaVision.

About

Thea

Transform your course materials into interactive study tools with an AI-powered platform. Upload notes, PDFs, or videos to generate flashcards, practice tests, and summaries. Learn efficiently and master your subjects with personalized study plans.

Highlights
  • AI-powered study material transformation
  • Interactive flashcards and game modes
  • Adaptive learning question generation
  • Practice test simulation
  • Automatic summarization and guide creation
  • Multi-language support
Features
Read full description

Feeling overwhelmed by lecture notes, textbook PDFs, and hours of video content? Stop juggling dozens of apps. Meet Thea.study, the all-in-one AI learning platform that transforms your course materials into powerful, interactive study tools in seconds. Reduce stress and save time with Thea, your smart study partner. We help you master your material efficiently, leaving more time for the things you love. Thea offers a powerful set of AI tools designed for personalized learning and better results. UPLOAD ANYTHING, STUDY INSTANTLY: Get started in seconds. Upload handwritten notes, PDFs, lecture videos, or even paste a YouTube link. Thea's AI extracts the key information and builds your personalized study kit. SMART STUDY: Move beyond rote memorization. Our AI-powered adaptive learning generates questions that focus on your weak spots, getting more challenging as you master the material. MEMORIZE FASTER: Use interactive flashcards and engaging game modes built on a proven spaced repetition system. Perfect for on-the-go learning that makes information stick. TEST WITH CONFIDENCE: Generate practice tests from your study materials to simulate the real exam environment. Build confidence and refine your strategy before exam day. SUMMARIZE & CREATE GUIDES: Instantly distill dense information into concise summaries. Generate comprehensive, downloadable study guides with a single click to simplify your revision process. DESIGNED FOR STUDENTS EVERYWHERE: With support for over 80 languages, you can learn and study in the language you're most comfortable with for better understanding. ACCESSIBLE ANYTIME, ANYWHERE: Thea works seamlessly across your computer, tablet, and smartphone. Your study companion goes wherever you do. A POWERFUL TOOL FOR EDUCATORS: Create classes, assign AI-generated study modules from your own teaching materials, and track student progress with our powerful analytics. Get Started in Seconds! Download Thea today and start achieving better results with less stress! EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of service: https://www.theastudy.com/termsofservice Privacy policy: https://www.theastudy.com/privacy

Screenshots

CellAtlas3 screens
Thea4 screens

Verdict

The call

The clearest difference is rating: Thea at 4.9 against CellAtlas's 3.2. Thea also leads on ratings volume (2.5K vs 22) and review sentiment (93% vs 84%). CellAtlas's advantage is in-app purchases (none vs 2). On price, update cadence, ads 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. Thea sells 2 in-app purchases, starting at $12.00 per month. CellAtlas asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Thea holds the better App Store score, 4.9 against 3.2. That said, the two scores are not equally well evidenced: Thea has 2.5K ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 84% of CellAtlas's written reviews are positive against 93% of Thea's.

UpkeepUpdate frequency

CellAtlas ships an update every 2 months, Thea monthly. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

Scorecard5 real differences · 5 level
CellAtlas versus Thea: the parameters behind the verdict, then further details
ParameterCellAtlasThea
PriceFreeFree
Rating3.2 (22 ratings)4.9 (2.5K ratings) — better
Positive reviews84.3% of reviews93.0% of reviews — better
Number of ratings222.5K — better
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.015.0
Further details — not scored
Size106 MB4 MB
Age rating4+12+
DeveloperCellaVisionThea Study

Customer experience

CellAtlas

All ratings22 ratings
Positive45.5%
Neutral22.7%
Negative31.8%
Written reviews121 reviews
Positive84.3%
Neutral5.0%
Negative10.7%

Thea

All ratings2,459 ratings
Positive97.8%
Neutral0.8%
Negative1.4%
Written reviews500 reviews
Positive93.0%
Neutral3.2%
Negative3.8%

User reviews

CellAtlas

From 22 App Store ratings

What we love

  • 👍 Great for learning morphology
  • 👍 Helpful study tool
  • 👍 Fun quiz format
  • 👍 Easy to navigate
  • 👍 Good for review

Room to improve

  • ⏰ Ridiculous timer
  • ⏰ Too little time
  • ⏰ Timer causes mistakes
  • ⏰ Timer prevents practice
  • 🐛 Quiz is broken/rigged

Thea

From 2.5K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Helpful AI features
  • 💰 Free version available
  • 📚 Effective for studying and learning
  • 🎓 Useful for AP and nursing exams

Room to improve

  • 🔍 Lack of spaced repetition setting
  • 🔒 Potential for paywalls in the future

Bugs and requests

CellAtlas

Reported bugs

6 issues
  • Timer is too short
  • Quiz moves too slowly after correct answer
  • Duplicate images that only one counts
  • App not opening on some devices
  • Missing WBCs
Show 1 more
  • Layout issues on older iPhones

Requested features

22 requests
  • Remove timer option
  • Untimed mode
  • More time for quizzes
  • Quizzes for specific cells/sections
  • More images/examples
Show 17 more
  • Larger database of cells
  • More examples of atypical/abnormal cells
  • Ability to practice specific cell types
  • Option to quiz on specific cell types
  • More options for tests (e.g., malignancies)
  • Ability to practice maturation stages
  • Zoomable slides
  • Labels for cell structures
  • Side-by-side cell comparison
  • Save quiz results
  • Add body fluid images
  • Add coag cascade
  • Add disease states/inclusions
  • Link to LIS system
  • More photos
  • Updates for more cell pictures
  • Support for older iPhone screens

Thea

Reported bugs

1 issue
  • Answers not mixed up in matching game

Requested features

2 requests
  • Spaced repetition setting
  • More customization options

In-app purchases

None

CellAtlas

No in-app purchases

2 purchases

Thea

Subscriptions2
  • Monthly$12.001 Month
  • Yearly$48.001 Year

Questions

Is CellAtlas free?
CellAtlas is free to download, with no in-app purchases.
Is Thea free?
Thea is free to download, with in-app purchases available.
Which has better reviews, CellAtlas or Thea?
Thea is rated higher. CellAtlas averages 3.2 out of 5 from 22 ratings, while Thea averages 4.9 from 2.5K ratings.
Do CellAtlas or Thea have ads?
Neither CellAtlas nor Thea shows ads.
Which is updated more often, CellAtlas or Thea?
CellAtlas ships an update every 2 months, and Thea monthly. Most recently, CellAtlas was updated on October 15, 2026 and Thea on October 17, 2026.

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