Bookshelf vs Zephyr Mobile Controller
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bookshelf
Access and study your digital textbooks on your iPad or iPhone. This app allows for offline reading, note-taking, flashcard creation, and customizable reading settings. Sync your progress across devices for a seamless study experience.
- Offline reading
- Customizable highlighters and notes
- Flashcard creation
- Personalized reading settings
- Read Aloud feature
- Cross-device syncing
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With Bookshelf, you can enjoy a digital-first, comprehensive study experience from the convenience of your iPad or iPhone. Access all of your VitalSource textbooks and study anytime, anywhere. Bookshelf Features: • Download books to your iOS device for 100% offline reading. • Customize highlighters and add notes for a rich study experience. • Create flashcards with text and images to learn concepts faster. • Personalize font, font size, and background colors to make reading easier. • Listen to your books and learn on the go with Read Aloud. • Sync your current reading position and all your work across devices so you can easily pick up where you left off. • Built with accessibility in mind. Requirements: • VitalSource Bookshelf account • Access to one or more VitalSource textbooks • iOS 17+
Zephyr Mobile Controller
Control drone simulations using your mobile device as a touchscreen controller. Connect your phone or tablet to the same network as the simulator for an immersive training experience.
- Touchscreen drone control
- Mobile simulator interface
- Network connectivity required
- Requires Zephyr Drone Simulator account
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The Zephyr Mobile Controller is a touch screen controller that allows you to fly drones in Zephyr Drone Simulator with just a phone or tablet. Enjoy the best drone training simulator with all the convenience of a mobile controller. Zephyr Mobile Controller requires an active Zephyr Drone Simulator account to function. Both the computer and the device used for the controller must be connected to the same network or same wifi signal. For more about Zephyr visit: https://zephyr-sim.com/
Screenshots
Verdict
The clearest difference is rating: Bookshelf at 4.7 against Zephyr Mobile Controller's 1.0. Bookshelf also leads on update cadence (every 6 weeks vs every 16 months) and ratings volume (78K vs 3). Zephyr Mobile Controller's advantage is iOS requirement (9.0 vs 17.6). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Bookshelf holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Bookshelf has 78K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 22% of Bookshelf's written reviews are positive against 0% of Zephyr Mobile Controller's.
Bookshelf ships an update every 6 weeks, Zephyr Mobile Controller every 16 months. The most recent releases landed on October 15, 2026 and September 26, 2026 respectively.
| Parameter | Bookshelf | Zephyr Mobile Controller |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (78K ratings) — better | 1.0 (3 ratings) |
| Positive reviews | 21.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 78K — better | 3 |
| Update frequency | Every 6 weeks — better | Every 16 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | #100 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 185 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | VitalSource Technologies, Inc. | Little Arms Studios |
Customer experience
Bookshelf
Zephyr Mobile Controller
Bugs and requests
Bookshelf
Reported bugs
4 issues- Frequent crashes and freezes
- Issues with page loading and scrolling
- Inconsistent behavior when switching between devices
- Unreliable text-to-speech functionality
Requested features
5 requests- Improved highlighting and annotation tools
- Apple Pencil support for note-taking
- More customization options (e.g., font, layout, night mode)
- Seamless cross-device synchronization
- Enhanced search and navigation features
Zephyr Mobile Controller
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Bookshelf
No in-app purchases
Zephyr Mobile Controller
No in-app purchases
Questions
Is Bookshelf free?
Is Zephyr Mobile Controller free?
Which has better reviews, Bookshelf or Zephyr Mobile Controller?
Do Bookshelf or Zephyr Mobile Controller have ads?
Which is updated more often, Bookshelf or Zephyr Mobile Controller?
Other comparisons
