SideBooks vs TrimPDF
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
TrimPDF
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Are PDF margins getting in the way? TrimPDF is a simple PDF viewer designed to crop page margins while you read. When a PDF has large margins, the actual content can appear small even when the page fills the screen. With TrimPDF, you can crop the top, bottom, left, and right margins so the content appears larger and is easier to read. It is especially useful for technical books, manuals, e-books, documents, and other PDFs you read frequently. ■ Crop PDF margins while viewing Adjust the margins at the top, bottom, left, and right of each PDF page. TrimPDF does not modify the original PDF file. The margins are cropped only while viewing. ■ Separate settings for even and odd pages In scanned books and similar PDFs, the margin positions may differ between left and right pages. TrimPDF lets you set different crop margins for even and odd pages. ■ Choose the page-turn direction Set the page-turn direction to match the PDF you are reading. ■ Save settings and reading position TrimPDF saves margin settings and viewing state for each PDF. Once adjusted, you can reopen the PDF later and continue reading with the same settings. ■ A simple PDF viewer TrimPDF is focused on one thing: making PDFs easier to read by cropping unnecessary margins. There are no complicated editing features. If you want a simple way to make margin-heavy PDFs more comfortable to read on iPhone or iPad, TrimPDF is for you.
Screenshots
Verdict
The clearest difference is price: SideBooks at Free against TrimPDF's $0.99. SideBooks also leads on update cadence (every 9 days vs every 12 months) and iOS requirement (15.0 vs 26.0). TrimPDF's advantage is in-app purchases (none vs 1). On ads and device support 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
SideBooks is free to download; TrimPDF costs $0.99 up front. SideBooks sells 1 one-off in-app purchase. TrimPDF asks for nothing beyond the download.
SideBooks ships an update every 9 days, TrimPDF every 12 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.
| Parameter | SideBooks | TrimPDF |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.6 (97 ratings) — better | — |
| Positive reviews | 73.7% of reviews | — |
| Number of ratings | 97 — better | — |
| Update frequency | Every 9 days — better | Every 12 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 33 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Tatsumi-system Co., Ltd. | SHIN INABA |
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
TrimPDF
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SideBooks
- Thema extension Add-On$0.99
TrimPDF
No in-app purchases







