# 3D Brain vs Psychology Dictionary

The clearest difference is rating: Psychology Dictionary at 4.5 against 3D Brain's 3.6. Psychology Dictionary also leads on update cadence (every 4 weeks vs every 2 months) and review sentiment (86% vs 75%). 3D Brain's advantage is iOS requirement (6.0 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. 3D Brain sells 1 one-off in-app purchase and Psychology Dictionary sells 8 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Psychology Dictionary holds the better App Store score, 4.5 against 3.6. Both are backed by a comparable volume of ratings — 146 and 420 respectively. Written reviews point the same way: 75% of 3D Brain's written reviews are positive against 86% of Psychology Dictionary's.

3D Brain ships an update every 2 months, Psychology Dictionary every 4 weeks. The most recent releases landed on November 9, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 3D Brain | Psychology Dictionary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (146 ratings)](https://appshunter.io/ios/app/3d-brain/id331399332/reviews) | **[4.5 (420 ratings)](https://appshunter.io/ios/app/psychology-dictionary/id1500147226/reviews)** |
| Number of ratings | 146 | **420** |
| Positive reviews | 74.6% of reviews | **85.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 70 MB | 54 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Cold Spring Harbor Laboratory](https://appshunter.io/developer/331399335) | [Nefarius Apps](https://appshunter.io/developer/1792473508) |

## What reviewers say

### 3D Brain

[App page](https://appshunter.io/ios/app/3d-brain/id331399332)

Explore a 3D model of the human brain, rotating and zooming to examine 29 interactive structures. Learn about the function of each region, the effects of injury, and its role in mental illness. Detailed information includes case studies and research links.

**Highlights:** 3D brain model, Interactive structures, Region functions, Brain injury effects, Mental illness involvement, Case studies, Research links

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3D Brain HQ | $0.99 | one-time |

**What reviewers like**

- 🧠 Informative brain visualizations
- 👍 Helpful for psychology/neuroscience students
- 🔍 Detailed information and case studies
- 🤓 Excellent learning tool

**What reviewers complain about**

- 🐛 App crashes after updates
- 🤯 Upgrade causes app to stop working
- 📱 Compatibility issues with newer devices
- 🔍 Limited brain structures covered

**Reported bugs**

- App crashes on launch after upgrade
- Purchased premium version not functioning
- Laggy performance and blurry images
- No way to exit app other than force closing

**Requested features**

- More brain structures and regions
- Improved 3D navigation and controls
- Ability to label and annotate the brain
- Quizzes and interactive learning features


### Psychology Dictionary

[App page](https://appshunter.io/ios/app/psychology-dictionary/id1500147226)

Explore over 18,000 psychological terms with in-depth explanations and a pronunciation guide. This app serves as a comprehensive resource for students, professionals, and anyone interested in mental health and self-improvement.

**Highlights:** Extensive database of 18,000+ terms, In-depth explanations, Bookmark and favorite terms, Pronunciation guide, Regularly updated content

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per 7 days |
| Premium | $4.99 | per 7 days |
| Premium weekly with discount | $9.99 | per 7 days |
| Premium | $9.99 | per month |
| Premium | $9.99 | per month |
| Premium | $14.99 | per month |
| Premium | $34.99 | per year |
| Premium | $74.99 | per year |

**What reviewers like**

- 📚 Comprehensive psychology terms
- 🤓 Useful for life and exams
- 👍 User-friendly interface
- 🌟 Great resource for students
- 💡 Detailed definitions

**What reviewers complain about**

- 💸 Expensive subscription
- 📺 Intrusive video ads
- 🙄 Ads interrupt typing
- ❌ Rate us function not working

**Reported bugs**

- Typo in definition of 'abuse' (foormal)
- App closes when looking up terms
- Video ads pop out while typing
- Rate us function doesn't work

**Requested features**

- Add small or key examples for each word
- Add horizontal view support for iPad (now implemented)


## Frequently asked questions

### Is 3D Brain free?

3D Brain is free to download, with in-app purchases available.

### Is Psychology Dictionary free?

Psychology Dictionary is free to download, with in-app purchases available.

### Which has better reviews, 3D Brain or Psychology Dictionary?

Psychology Dictionary is rated higher. 3D Brain averages 3.6 out of 5 from 146 ratings, while Psychology Dictionary averages 4.5 from 420 ratings.

### Do 3D Brain or Psychology Dictionary have ads?

Neither 3D Brain nor Psychology Dictionary shows ads.

### Which is updated more often, 3D Brain or Psychology Dictionary?

3D Brain ships an update every 2 months, and Psychology Dictionary every 4 weeks. Most recently, 3D Brain was updated on November 9, 2026 and Psychology Dictionary on November 3, 2026.

---

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