# Mars Info vs ReadBay

The clearest difference is price: ReadBay at Free against Mars Info's $6.99. ReadBay also leads on review sentiment (85% vs 42%) and rating (4.8 vs 4.3). Mars Info's advantage is in-app purchases (none vs 4). On ratings volume, ads and device support there is nothing between them.

ReadBay is free to download; Mars Info costs $6.99 up front. ReadBay sells 4 in-app purchases, starting at $4.99 per month. Mars Info asks for nothing beyond the download.

ReadBay holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 159 and 239 respectively. Written reviews point the same way: 42% of Mars Info's written reviews are positive against 85% of ReadBay's.

Mars Info ships an update every 2 months, ReadBay every 10 days. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Mars Info | ReadBay |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | [4.3 (159 ratings)](https://appshunter.io/ios/app/mars-info/id1088383309/reviews) | **[4.8 (239 ratings)](https://appshunter.io/ios/app/readbay-book-summaries/id6499073338/reviews)** |
| Number of ratings | 159 | **239** |
| Positive reviews | 41.7% of reviews | **84.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 212 MB | 60 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | **iPhone, iPad, Mac, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Viktor Goltvyanytsya](https://appshunter.io/developer/556365139) | [Bange Sabastine Hwonyi](https://appshunter.io/developer/1708740698) |

## What reviewers say

### Mars Info

[App page](https://appshunter.io/ios/app/mars-info/id1088383309)

Explore the Red Planet with an interactive 3D globe. Discover and learn about key Martian locations like volcanoes, craters, and mountains. View detailed information including size and coordinates for each point of interest.

**Highlights:** Interactive 3D globe with gesture controls, Pinpoint 80+ interesting Martian locations, Detailed information on locations, Zoom, rotate, and tilt controls, List of selectable locations

**Features:** 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 Mars Info free?

Mars Info costs $6.99, with no in-app purchases.

### Is ReadBay free?

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

### Which has better reviews, Mars Info or ReadBay?

ReadBay is rated higher. Mars Info averages 4.3 out of 5 from 159 ratings, while ReadBay averages 4.8 from 239 ratings.

### Do Mars Info or ReadBay have ads?

Neither Mars Info nor ReadBay shows ads.

### Which is updated more often, Mars Info or ReadBay?

Mars Info ships an update every 2 months, and ReadBay every 10 days. Most recently, Mars Info was updated on November 2, 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.*