SideBooks vs Reader+
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
Reader+
Instantly digitize your physical books using your device's camera. This app supports various file formats and cloud storage, offering features like TTS, customizable reading settings, and social sharing.
- Scan physical books with rear camera
- Supports PDF, EPUB, TXT, CBZ, CBR formats
- Cloud storage integration (Google Drive, Dropbox, iCloud)
- Text-to-Speech (TTS) functionality
- Customizable reading settings (font, margins, background)
- Page curl and slide animations
- Social media sharing
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● Reader+ can scan books with rear camera of your device instantly, so you can enjoy your own paper books in iPad or iPhone. ● and support the following file formats. - pdf, epub, txt - zip, rar, cbz, cbr ● You can add following items - Book (for scan) - Shelf (folder) - FTP Server - GoogleDrive, Dropbox - iCloud ● Support bookmark and word search feature. ● You can edit ( modify, delete, move, copy, paste ) items at anytime. ● Support TTS (Text To Speech) feature with simple gesture. ● Support page curl animation and slide animation. ● Including night mode, support various background images. ● For epub and txt file, support various font family and you can change margin, line height, font size. ● Reader+ can post page to Twitter/Facebook/SMS. ● Reader+ can export book to other apps or devices. ● You can perform following operations for scanned results instantly. - Change margin/move/rotate/scale - Skew correction - Color correction - Save or Remove pages
Screenshots
Verdict
The clearest difference is review sentiment: SideBooks at 74% against Reader+'s 18%. SideBooks also leads on rating (4.6 vs 2.7) and update cadence (every 9 days vs every 3 months). 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. SideBooks sells 1 one-off in-app purchase and Reader+ sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
SideBooks holds the better App Store score, 4.6 against 2.7. Both are backed by a comparable volume of ratings — 97 and 23 respectively. Written reviews point the same way: 74% of SideBooks's written reviews are positive against 18% of Reader+'s.
SideBooks ships an update every 9 days, Reader+ every 3 months. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.
| Parameter | SideBooks | Reader+ |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (97 ratings) — better | 2.7 (23 ratings) |
| Positive reviews | 73.7% of reviews — better | 17.6% of reviews |
| Number of ratings | 97 — better | 23 |
| Update frequency | Every 9 days — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 | 9.0 |
| Further details — not scored | ||
| Size | 32 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Tatsumi-system Co., Ltd. | LEE DONG WON |
Customer experience
SideBooks
Reader+
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
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- Implement a more intuitive file management system
Reader+
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SideBooks
- Thema extension Add-On$0.99
Reader+
- Reader+ Pro$1.99









