# Binomial Distribution PRO vs ReadBay

The clearest difference is price: ReadBay at Free against Binomial Distribution PRO's $1.99. ReadBay also leads on update cadence (every 10 days vs monthly). Binomial Distribution PRO's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement there is nothing between them.

ReadBay is free to download; Binomial Distribution PRO costs $1.99 up front. ReadBay sells 4 in-app purchases, starting at $4.99 per month. Binomial Distribution PRO asks for nothing beyond the download.

Binomial Distribution PRO ships an update monthly, ReadBay every 10 days. The most recent releases landed on October 2, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Binomial Distribution PRO | ReadBay |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.8 (256 ratings)](https://appshunter.io/ios/app/readbay-book-summaries/id6499073338/reviews)** |
| Number of ratings | — | **256** |
| Positive reviews | — | 84.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 179 MB | 60 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Bange Sabastine Hwonyi](https://appshunter.io/developer/1708740698) |

## What reviewers say

### Binomial Distribution PRO

[App page](https://appshunter.io/ios/app/binomial-distribution-pro/id6472450459)

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

**In-app purchases:** none


### ReadBay

[App page](https://appshunter.io/ios/app/readbay-book-summaries/id6499073338)

Access concise summaries and audio versions of bestselling books in under 15 minutes. Master key insights from business, self-help, and personal development titles for faster learning and habit building.

**Highlights:** 15-minute book summaries, Audiobook summaries, Offline reading, Progress tracking, Habit building challenges, Bookmark favorite notes

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro Membership | $4.99 | per month |
| Pro Annual Membership | $19.99 | per year |
| Yearly Pro Membership | $24.99 | per year |
| Lifetime Membership | $39.99 | one-time |

**What reviewers like**

- 🚀 Informative and easy to follow
- 👍 Smooth listening experience
- 👍 Broad library of titles
- 👍 Allows reading or listening
- 👍 User-friendly interface

**What reviewers complain about**

- 🐛 Usability issues when multitasking
- 🐛 Audiobook restarts from beginning
- 🔒 Lack of transparency (broken links, no contact info)
- 👎 Limited book recommendations
- 👎 Needs more book options and larger selection

**Reported bugs**

- Purchased lifetime subscription not accessible on new device
- Identical summaries for different books

**Requested features**

- Support for French books
- Ability to share summaries to Kindle
- More language options (e.g., Chinese)


## Frequently asked questions

### Is Binomial Distribution PRO free?

Binomial Distribution PRO costs $1.99, with no in-app purchases.

### Is ReadBay free?

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

### Do Binomial Distribution PRO or ReadBay have ads?

Neither Binomial Distribution PRO nor ReadBay shows ads.

### Which is updated more often, Binomial Distribution PRO or ReadBay?

Binomial Distribution PRO ships an update monthly, and ReadBay every 10 days. Most recently, Binomial Distribution PRO was updated on October 2, 2026 and ReadBay 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.*