# CellAtlas vs Thea

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.

Both are free to download. Thea sells 2 in-app purchases, starting at $12.00 per month. CellAtlas asks for nothing beyond the download.

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.

CellAtlas ships an update every 2 months, Thea monthly. The most recent releases landed on October 15, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | CellAtlas | Thea |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (22 ratings)](https://appshunter.io/ios/app/cellatlas/id413226907/reviews) | **[4.9 (2.5K ratings)](https://appshunter.io/ios/app/thea-study-smart/id6742800289/reviews)** |
| Number of ratings | 22 | **2.5K** |
| Positive reviews | 84.3% of reviews | **93.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 106 MB | 4 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [CellaVision](https://appshunter.io/developer/1185675201) | [Thea Study](https://appshunter.io/developer/1800055800) |

## What reviewers say

### CellAtlas

[App page](https://appshunter.io/ios/app/cellatlas/id413226907)

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:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- 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

**Requested features**

- Remove timer option
- Untimed mode
- More time for quizzes
- Quizzes for specific cells/sections
- More images/examples


### Thea

[App page](https://appshunter.io/ios/app/thea-study-smart/id6742800289)

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:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $12.00 | per month |
| Yearly | $48.00 | per year |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- Answers not mixed up in matching game

**Requested features**

- Spaced repetition setting
- More customization options


## Frequently asked 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 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*