SideBooks vs Panels
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SideBooks
This app offers a high-performance PDF and comic viewer with realistic paper-turning animations. It supports various viewing directions, enhanced bookshelf management, and secure password protection for your documents. Easily import files from multiple sources and enjoy a customizable reading experience.
- Realistic paper curl animation
- Multiple viewing directions
- Enhanced bookshelf management
- Password protection
- Dropbox and iTunes file import
- Supports PDF, ZIP, CBZ, RAR, CBR
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SideBooks is a high performance, high speed PDF viewer that allows you to enjoy reading with the feel of actual paper. =Features= Curl animation that simulates the actual turning of paper pages has been added to the standard page slide function. Supports viewing from 3 directions, documents that open left to right, right to left and vertically. It provides the optimal environment for viewing any book. All zoom rates have been optimized providing high speed, dynamic screen display. An infinite hierarchy of folders can be created, moved, deleted, renamed, etc. using the enhanced bookshelf management function. Real visual bookshelf function that corresponds to back cover style display. Files can be imported by 3 methods, Network transfer through Dropbox, USB transfer through iTunes and direct transfer from other applications. Books can be protected so others cannot view them by using the password protected locking function. This is a universal application that operates on the iPhone, iPod Touch and iPad. =Functions= Overall: *Brightness Adjustment *Screen rotates to match the orientation of the device *Screen Rotation Lock *Password Protected Start-up Lock Viewer: *Support PDF,ZIP,CBZ,RAR and CBR format *Page Turning: Choose from slide or curl *Viewing Directions: Choose from opening left to right / right to left / vertically *Page Spacing: Choose form wide / narrow / none *Facing Pages: Choose the pair of facing pages by setting the cover to on or off *Trim function within the range of page display *Cache pre-read function for the previous and next pages *Set the display for each book and remember the page number of the last page read *Text search function (list display type) *Contents function (also supports hierarchy type) *Bookmark function (with editable memos) *Edit handwritten notes *Send to other applications (Open-In) *Send by email *Printing function (Air Print) *In-page link function *Link to outside URL function (built-in browser / Safari / Printing) *Display / Don't Display link buttons *Page turning function using tap or swipe *Expansion / Contraction function using pinch and double tap (1-1024x zoom) *Viewing of encrypted PDF files with password protection *Display / non-display of statusbar when reading Bookshelf: *Display form: Choose form list bookshelf / visual bookshelf *Function to set theme of visual bookshelf with each folder *Bookshelf thema extension pack (Add-On) *Cover editing function (corresponds to the trim) *File editing function: create, move, delete, setting for all books in folder *Bookmark list *Reading history list *Unread list *Edit of mark choose form already read / unread *Book name search function *Network transfer through Dropbox *USB transfer through iTunes *Direct transfer from other applications Special thanks to, "Give My Regards to Black Jack" SHUHO SATO Manga on Web http://mangaonweb.com
Panels
Enhance your comic and manga reading with a clean, customizable interface. Enjoy universal file compatibility, cross-device syncing, and advanced reading presets. Organize your library, secure your content, and import from various cloud services and local networks.
- Universal file compatibility (CBR, CBZ, PDF, ePUB)
- Cross-device reading progress sync
- iCloud Drive integration
- Customizable reading presets
- Right-to-left reading for manga
- OPDS server support
- Content security with password/Face ID
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Improve your comic reading experience with Panels. Enjoy reading your favorite titles in a clean and delightful interface, with plenty of customization and advanced features — fully DRM-free, with first-class support for OPDS, your own library, and your own files. Key features: - Universal Compatibility: Support for most common comic types: CBR, CBZ, CB7, PDF and comic ePUB (not text eBook). Support for multiple image formats, including WebP. - Cross-Device Sync: Synchronize your reading progress across iPhone, iPad and Mac and resume reading exactly where you left off. - Full iCloud Drive support: store your entire library on iCloud and access it from different devices. - Library Organization: Effortlessly manage your comic library with intuitive tools for easy navigation, custom folder colors, logos and cover images. * Themes: support for Light and Dark modes, and many others. * Reading Presets: Choose from a multitude of reading presets or create your own, including horizontal, vertical, or panel-by-panel guided view. - Right to Left reading (manga): read any comic with Panels. * OPDS support: Stream, search and download comics from your OPDS compatible server (Komga, Kavita, Codex, Ubooquity and others). * Secure your content: Keep files locked using a password or Face ID for your collections and files. Use Incognito mode to keep your reading sessions hidden. * Live Text and Subject detection. * Experimental Features: Access experimental features like panel-by-panel navigation. Panels Store — DRM-free comics from independent creators: - Browse and buy comics directly inside Panels, no extra apps or accounts. - 100% DRM-free: every purchase is yours to keep, read offline and back up. - Creators keep 80% of revenue, so your purchases directly support the people making the comics. - Purchased issues are added to your library and sync across your devices automatically. Native support for importing files from: * iCloud Drive * Dropbox * Microsoft OneDrive - Substack * OPDS: Komga, Kavita, Codex and others * Local network shared files and folders via SMB and Embedded web server - iTunes - External drives - Airdrop - Drag&Drop from other apps Page Filters: * Reduce Noise * Increase Sharpness * Reduce Moiré * Crop Borders * Require an active subscription or a one-time purchase. • You may purchase an Auto-Renewing Subscription to unlock all the premium features while it\'s active; or a one-off purchase to unlock the current major version features forever. • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase • Read our privacy policy and terms of use: https://panels.app/privacy / https://panels.app/terms
Screenshots
Verdict
The clearest difference is ratings volume: Panels at 12K against SideBooks's 97. Panels also leads on rating (4.8 vs 4.6) and chart position (#191 vs unranked). SideBooks's advantage is iOS requirement (9.0 vs 15.0). On price, review sentiment, update cadence and ads 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. SideBooks sells 1 one-off in-app purchase and Panels sells 5 in-app purchases, starting at $1.49 per month. Whichever you choose, the download price is not the number that matters.
Panels holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Panels has 12K ratings behind it against 97, so its average is the more settled of the two. Written reviews complicate that: 72% of SideBooks's written reviews are positive against 70% of Panels's, so the app with the better star average is not the one people write more warmly about.
SideBooks ships an update every 9 days, Panels every 8 days. Both last shipped on September 23, 2026.
| Parameter | SideBooks | Panels |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (97 ratings) | 4.8 (12K ratings) — better |
| Positive reviews | 72.4% of reviews — better | 70.2% of reviews |
| Number of ratings | 97 | 12K — better |
| Update frequency | Every 9 days | Every 8 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | #191 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 32 MB | 165 MB |
| Age rating | 4+ | 4+ |
| Developer | Tatsumi-system Co., Ltd. | Produkt Studio |
Customer experience
SideBooks
Panels
User reviews
SideBooks
From 97 App Store ratingsWhat we love
- 🚀 Smooth page turning
- 📚 Great for reading comics and manga
- 🗂️ Excellent folder organization
- 🔍 Useful search and table of contents features
- 💻 Seamless Dropbox integration
Room to improve
- 🐛 Crashes when loading large files
- 🚫 Limited file format support (no CBZ/CBR)
- 🔍 Difficult to find and delete books
- 🔒 Requires Dropbox access, no local file support
- 🔍 Small thumbnail size makes it hard to browse
Panels
From 12K App Store ratingsWhat we love
- 🚀 Smooth and responsive
- 👍 Clean and modern UI
- 💡 Useful features like panel view and vertical scrolling
- 🔒 No ads in paid version
- 👍 Good import and organization options
Room to improve
- 🐛 Occasional crashes and bugs
- 🔒 Useful features locked behind paywall
- 🔒 Subscription model instead of one-time purchase
- 🐛 Issues with page navigation and zoom
- 🐛 Problems with reading right-to-left content
Bugs and requests
SideBooks
Reported bugs
3 issues- Crashes when opening certain PDF files
- Corrupted files cause repeated crashes
- Dropbox integration issues on some devices
Requested features
6 requests- Add support for ePub and other popular formats
- Implement iCloud/Google Drive integration
- Allow manual rearrangement of bookshelf
- Add dark mode and customizable background options
- Improve bookmark and annotation features
Show 1 moreShow fewer
- Implement a more intuitive file management system
Panels
Reported bugs
5 issues- Crashes when opening large files
- Issues with page order and navigation
- Problems with zooming and scrolling
- Syncing and importing bugs
- Compatibility issues with older devices
Requested features
6 requests- Ability to create sub-folders and nested collections
- Automatic sorting and organization of comics
- Option to lock reading direction
- Double-tap to zoom functionality
- Progress tracking and bookmarking features
Show 1 moreShow fewer
- Support for more file formats like ePub
In-app purchases
SideBooks
- Thema extension Add-On$0.99
Panels
- Panels+ Monthly7 Days trial$1.491 Month
- Panels+ Yearly7 Days trial$14.991 Year
- Panels 3 Upgrade$9.99
- Panels 2$19.99
- Panels 3$19.99








