# OrthoLine vs DiagnosUs

The clearest difference is review sentiment: DiagnosUs at 79% against OrthoLine's 33%. DiagnosUs also leads on rating (4.8 vs 3.7) and in-app purchases (none vs 3). OrthoLine's advantage is iOS requirement (12.0 vs 16.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. OrthoLine sells 3 one-off in-app purchases. DiagnosUs asks for nothing beyond the download.

DiagnosUs holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: DiagnosUs has 1K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 33% of OrthoLine's written reviews are positive against 79% of DiagnosUs's.

OrthoLine ships an update every 3 months, DiagnosUs fortnightly. The most recent releases landed on October 2, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | OrthoLine | DiagnosUs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/ortholine-learning/id1080198908/reviews) | **[4.8 (1K ratings)](https://appshunter.io/ios/app/diagnosus/id1369759559/reviews)** |
| Number of ratings | 3 | **1K** |
| Positive reviews | 33.3% of reviews | **79.4% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 27 MB | 42 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 17+ | 17+ |
| Developer | [Alexander Rusak](https://appshunter.io/developer/646910828) | [Centaur Labs](https://appshunter.io/developer/1369759558) |

## What reviewers say

### OrthoLine

[App page](https://appshunter.io/ios/app/ortholine-learning/id1080198908)

This app aids in the analysis of cephalograms, offering tools for measurements, various author-developed analysis systems, and visual treatment planning. Results can be viewed as tables or diagrams and exported as PDF files.

**Highlights:** Cephalogram analysis, Author's analysis systems, Visual Treatment Objective (VTO), Measurement and diagram results, PDF export, Custom cephalogram upload

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| add 1 cephalogram | $3.99 | one-time |
| add 5 cephalograms | $16.99 | one-time |
| add 10 cephalograms | $29.99 | one-time |


### DiagnosUs

[App page](https://appshunter.io/ios/app/diagnosus/id1369759559)

Engage with real medical cases to enhance your diagnostic skills and earn rewards. This educational game is designed for students and professionals to test their knowledge across various specialties and contribute to AI research.

**Highlights:** Analyze diverse medical cases, Improve diagnostic skills, Earn rewards for participation, Contribute to AI research, Study for medical exams, Regularly updated datasets

**In-app purchases:** none

**What reviewers like**

- 💰 Earn money while learning
- 🧠 Helpful for medical students and professionals
- 🤓 Interesting and educational content
- 👍 Fun and engaging app
- 🤝 Responsive and helpful support team

**What reviewers complain about**

- 🐛 Bugs and technical issues (crashes, freezes, slow loading)
- ⏱️ Time-consuming to compete and earn rewards
- 🤖 Inconsistent or inaccurate AI-graded answers
- 🤑 Difficult to earn significant amounts of money
- 🔒 Withdrawal issues for some countries

**Reported bugs**

- App crashes and freezes
- Inaccurate or inconsistent grading of answers
- Withdrawal and payment issues for some users
- Compatibility problems with certain devices and OS versions

**Requested features**

- More diverse medical topics and case studies
- Separate competitions for students vs. professionals
- Ability to discuss and provide feedback on cases
- Improved instructions and explanations
- Compatibility with older devices and iOS versions


## Frequently asked questions

### Is OrthoLine free?

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

### Is DiagnosUs free?

DiagnosUs is free to download, with no in-app purchases.

### Which has better reviews, OrthoLine or DiagnosUs?

DiagnosUs is rated higher. OrthoLine averages 3.7 out of 5 from 3 ratings, while DiagnosUs averages 4.8 from 1K ratings.

### Do OrthoLine or DiagnosUs have ads?

Neither OrthoLine nor DiagnosUs shows ads.

### Which is updated more often, OrthoLine or DiagnosUs?

OrthoLine ships an update every 3 months, and DiagnosUs fortnightly. Most recently, OrthoLine was updated on October 2, 2026 and DiagnosUs on October 15, 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.*