# Hypothesis Test vs ReadBay

The clearest difference is price: ReadBay at Free against Hypothesis Test's $1.99. ReadBay also leads on ratings volume (239 vs 1) and update cadence (every 10 days vs monthly). Hypothesis Test's advantage is in-app purchases (none vs 4) and rating (5.0 vs 4.8). On ads, device support and iOS requirement there is nothing between them.

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

Hypothesis Test holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ReadBay has 239 ratings behind it against 1, so its average is the more settled of the two.

Hypothesis Test ships an update monthly, ReadBay every 10 days. Both last shipped on November 4, 2026.

## The numbers

| Metric | Hypothesis Test | ReadBay |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hypothesis-test-type-i-pro/id6472454829/reviews)** | [4.8 (239 ratings)](https://appshunter.io/ios/app/readbay-book-summaries/id6499073338/reviews) |
| Number of ratings | 1 | **239** |
| Positive reviews | — | 84.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 180 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

### Hypothesis Test

[App page](https://appshunter.io/ios/app/hypothesis-test-type-i-pro/id6472454829)

Perform Type I Error hypothesis testing with customizable null hypotheses and sample sizes. Calculate alpha errors or acceptance/rejection ranges with detailed, step-by-step solutions. Save and share your calculations.

**Highlights:** Type I Error hypothesis testing, Calculate alpha error, Calculate acceptance/rejection range, Right, left, or bilateral tests, Step-by-step solution display, Calculation history, Shareable results

**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 Hypothesis Test free?

Hypothesis Test costs $1.99, with no in-app purchases.

### Is ReadBay free?

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

### Which has better reviews, Hypothesis Test or ReadBay?

Hypothesis Test is rated higher. Hypothesis Test averages 5.0 out of 5 from 1 ratings, while ReadBay averages 4.8 from 239 ratings.

### Do Hypothesis Test or ReadBay have ads?

Neither Hypothesis Test nor ReadBay shows ads.

### Which is updated more often, Hypothesis Test or ReadBay?

Hypothesis Test ships an update monthly, and ReadBay every 10 days. Most recently, Hypothesis Test was updated on November 4, 2026 and ReadBay on November 4, 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.*