# Bayes' post vs Littmann Learning

The clearest difference is rating: Littmann Learning at 4.9 against Bayes' post's 3.7. Littmann Learning also leads on update cadence (every 6 weeks vs every 23 months) and ratings volume (850 vs 3). Bayes' post's advantage is in-app purchases (none vs 11) and iOS requirement (9.0 vs 15.6). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Littmann Learning sells 11 in-app purchases, starting at $3.99 per month. Bayes' post asks for nothing beyond the download.

Littmann Learning holds the better App Store score, 4.9 against 3.7. That said, the two scores are not equally well evidenced: Littmann Learning has 850 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 50% of Bayes' post's written reviews are positive against 48% of Littmann Learning's, so the app with the better star average is not the one people write more warmly about.

Bayes' post ships an update every 23 months, Littmann Learning every 6 weeks. The most recent releases landed on October 2, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Bayes' post | Littmann Learning |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137/reviews) | **[4.9 (850 ratings)](https://appshunter.io/ios/app/littmann-learning/id1324485260/reviews)** |
| Number of ratings | 3 | **850** |
| Positive reviews | **50.0% of reviews** | 47.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 19 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [CSD Labs](https://appshunter.io/developer/1318756877) |

## What reviewers say

### Bayes' post

[App page](https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137)

This medical app calculates the probability of a disease after a diagnostic test. It uses pre-test probability, test sensitivity, and specificity to determine post-test probabilities for both positive and negative results.

**Highlights:** Calculate post-test probability, Input pre-test probability, Use test sensitivity, Use test specificity, Analyze positive results, Analyze negative results

**Features:** macOS Compatibility

**In-app purchases:** none


### Littmann Learning

[App page](https://appshunter.io/ios/app/littmann-learning/id1324485260)

This app provides access to real patient heart and lung sounds for auscultation education. It offers visual and audio displays, self-paced learning modules, and background reading material to help users recognize various heart and lung sounds.

**Highlights:** Real patient heart and lung sounds, Visual and audio displays, Self-paced learning modules, Graduated learning difficulty, Background reading material

**Features:** Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Plan - 1 month | $3.99 | per month |
| Premium Plan - 1 month | $6.99 | per month |
| Basic Monthly | $8.99 | per month |
| Standard Plan - 1 year | $19.99 | per year |
| Semester Pass | $29.99 | per 6 months |
| Premium Plan - 1 year | $39.99 | per year |
| Full Version | $44.99 | per year |
| Annual Pass | $49.99 | per year |
| CE -  Fundamentals | $124.99 | one-time |
| CE -Advanced | $174.99 | one-time |
| CE - Intermediate | $249.99 | one-time |


## Frequently asked questions

### Is Bayes' post free?

Bayes' post is free to download, with no in-app purchases.

### Is Littmann Learning free?

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

### Which has better reviews, Bayes' post or Littmann Learning?

Littmann Learning is rated higher. Bayes' post averages 3.7 out of 5 from 3 ratings, while Littmann Learning averages 4.9 from 850 ratings.

### Do Bayes' post or Littmann Learning have ads?

Neither Bayes' post nor Littmann Learning shows ads.

### Which is updated more often, Bayes' post or Littmann Learning?

Bayes' post ships an update every 23 months, and Littmann Learning every 6 weeks. Most recently, Bayes' post was updated on October 2, 2026 and Littmann Learning on October 16, 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.*