Calibre Connector vs TrimPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calibre Connector
This application facilitates the transfer of book information from the Calibre software to your Apple device. It enables easy access to your digital library on the go.
- Download Calibre information
- Sync to iDevice
- Access digital library
- Supports iPhone and iPad
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This app allows the user to download the information from calibre to their iDevice.
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: Calibre Connector at Free against TrimPDF's $0.99. Calibre Connector also leads on update cadence (every 4 days vs every 12 months) and iOS requirement (17.2 vs 26.0). On ads, in-app purchases 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
Calibre Connector is free to download; TrimPDF costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Calibre Connector ships an update every 4 days, TrimPDF every 12 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Calibre Connector | TrimPDF |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 2.4 (13 ratings) — better | — |
| Positive reviews | 23.1% of reviews | — |
| Number of ratings | 13 — better | — |
| Update frequency | Every 4 days — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.2 — better | 26.0 |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Phillip Walker | SHIN INABA |
In-app purchases
Calibre Connector
No in-app purchases
TrimPDF
No in-app purchases







