# Bookends — Reference management on the go

> Mobile reference management and PDF annotation tool for researchers. (iPhone/iPad app by Sonny Software, LLC.)

- Source: https://appshunter.io/ios/app/bookends/id739087947 (this page in markdown: same URL + `.md`)
- Developer: [Sonny Software, LLC](https://appshunter.io/developer/417583547)
- Category: Productivity, Medical
- Price: Free with in-app purchases (on sale, was $10.99)
- Rating: 4.70/5 from 394 App Store ratings · 127 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 111 MB
- Languages: American English
- Released: 2013-11-13
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/bookends/id739087947/reviews.md

## What is Bookends?

Bookends is the reference management app you've been looking for.

The basic version offers:

• Search online sites directly (arXiv, Google Books, Google Scholar, JSTOR, the Library of Congress, PubMed, PubMed Central, and Semantic Scholar) or use the built-in browser (EZProxy-compliant) to download reference metadata and PDFs (access privileges required). Searches can return a maximum of 20 references, and only 50 references can be stored in your personal database.
• Use unique identifiers such as DOI, PMID, ISBN, or arXiv id to autofill references.
• View the text of PDF annotations in a note stream, and create your own with our powerful PDF markup engine.
• Barcode scanning, one per day.
• And many more features designed to help you discover, organize, and use reference information.

Standard, one-time purchase ($14.99):

• No limit on searches or importing.

Premium, yearly subscription ($14.99). Requires a Standard purchase.

• Cloud sync with all your iOS devices and Bookends for Mac (separate purchase).
• Share online libraries with colleagues.
• Scan documents with Mellel Mobile*.
• Create multiple libraries.
• Unlimited barcode scanning.
• Extract PDF annotations with deep links to annotations and text.
• Convenient UI to add PDF notes to the library.
• Automate your actions with Shortcuts.

* iPad-only. Requires a Mellel Mobile Premium subscription.

Subscription is for one year and has an auto-renew option. The subscription can be managed in iOS -> Settings > [your name] > Subscriptions. A subscription will renew if it isn't canceled at least 24 hours before the renewal date.
If the subscription is not renewed, Premium will be disabled but Standard will continue to work.

Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Search online reference databases
- Import metadata and PDFs
- PDF annotation and markup
- Barcode scanning for references
- Cloud sync across devices
- Share online libraries
- Create multiple libraries

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium | $14.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Standard | $14.99 | one-time |


## What do users think of Bookends?

Overall sentiment: positive

**Pros**

- 🚀 Seamless sync across devices
- 👍 Excellent PDF annotation tools
- 🔒 Reliable and stable
- 💡 Powerful reference management features
- 👍 Responsive and helpful developer support

**Cons**

- 🐛 Sync issues with iCloud and PDF files
- 🔒 Subscription model for essential features
- 👎 Outdated and clunky user interface
- 🔒 Limited functionality on iOS without subscription

**Commonly reported bugs**

- Incompatibility with iCloud Optimized Storage
- Unreliable sync between desktop and mobile versions
- Occasional data loss or corruption

**Most requested features**

- Nested folders and tags for better organization
- Automatic PDF metadata extraction
- Improved search and filtering capabilities
- Seamless integration with third-party services

## Recent user reviews (10 of 127)

All indexed reviews: https://appshunter.io/ios/app/bookends/id739087947/reviews.md

### 5/5 — I Love This App Even More

*2026-04-15, version 5.0.3*

This latest update has streamlined the functionality. I etnusiastically recommend without reservation. I’ve always relied on the mobile version. As the title states, love it even more!

### 1/5 — Can’t access years of citations anymore

*2026-03-06, version 5.0.1*

If you don’t keep paying for the upgrades, you will lose access to your citation database.  Be ready to keep upgrading to keep access.

### 5/5 — Best-in-class Reference Manager!!!

*2026-01-24, version 4.2.2*

I have a working university licence for the latest Endnote and work with colleagues using Zotero, Jabref and Mendeley across macOS, Windows and Linux. I have extensive knowledge of bibliographic workflows. Bookends is the BEST bibliographic tool overall on any platform. The sync between macOS and iOS is instant and reliable and makes accessing references while in an academic talk, conference, writing on a train etc so easy. Worth every penny!!!

### 5/5 — Your library in your pocket!

*2025-11-15, version 4.2.2*

Meeting a colleague for coffee and you know there is a perfect article or book, but can’t remember the title? Or made a new friend who you know you read their work but vague on the details? Stuck at the airport and looking for that existentialist text that describes your current situation? Bookends is your solution! Plus the guys who are behind the app are some of the most responsive app developers in the business!

### 5/5 — Invaluable

*2025-08-17, version 4.2.2*

We have long found Bookends for the Mac to be invaluable, and the iPad version has become so too.

### 5/5 — Da anni la mia app per bibliografie

*2025-04-20, version 4.2*

Notevoli miglioramenti nel tempo nella sua versione per iPad. Attualmente lo uso preferenzialmente su tablet

### 3/5 — Useful but awkward

*2024-12-25, version 4.1.1*

We find Bookends for the Mac to be invaluable, and this version is useful for looking up references that we entered on the Mac, but it entering new references on this version is awkward.

### 5/5 — Greatest Of All Time

*2024-10-15, version 4.1.1*

There simply isn’t a better reference management and annotation software package out there. Syncs flawlessly across devices, excellent search and indexing features. Should be everyone’s first purchase when they’re admitted to graduate school.

### 3/5 — Additional 50%

*2024-08-15, version 4.0.2*

On top of buying this, there is a sub for pro features. 

This has had a 50% increase without major functionality change. 

As an occasional user, I’ll have to subscribe when needed rather than just leave running

I’m sure it was a commercial decision. Mine too

### 3/5 — Subscription Required

*2024-05-29, version 4.0.2*

… for cloud sync, using iCloud. Now is this even allowed?

## Frequently asked questions about Bookends

### What does Bookends do?

Bookends is a mobile application designed for managing research references and associated PDF documents. It allows users to search online databases for references, import metadata, annotate PDFs with a markup engine, and organize their research library. The app aims to streamline the process of discovering, organizing, and utilizing reference information for academic and research purposes.

### What are the key features of Bookends?

Key features include the ability to search various online academic sites like PubMed and Google Scholar, autofill references using unique identifiers (DOI, PMID, ISBN), annotate and mark up PDF documents, and scan barcodes for reference entry. Premium features offer unlimited imports, cloud synchronization across devices, the ability to share libraries, and create multiple libraries.

### How much does Bookends cost?

The basic version of Bookends is free, offering limited searches and storage. A Standard version is available as a one-time purchase for $14.99, removing search and import limits. A Premium yearly subscription, costing $14.99 and requiring the Standard purchase, unlocks advanced features like cloud sync and unlimited barcode scanning.

### What devices is Bookends compatible with?

Bookends is available for iOS devices. Some features, like scanning documents with Mellel Mobile, are iPad-only and may require a separate subscription to Mellel Mobile Premium. Cloud sync functionality requires Bookends for Mac, which is a separate purchase.

### How can I use Bookends for my research?

You can use Bookends to easily find and import references from online academic databases directly into your mobile device. The app helps you keep all your research papers organized, allowing you to annotate PDFs to highlight key information and add notes. This makes it a powerful tool for students and researchers to manage their literature review and writing process efficiently.

## Version history (last 5 releases)

### 5.0.4 — 2026-05-01

• Fixed a Library search issue.
• Updated Google Books search to handle recent Google changes.
• Fixed an issue where a shared PDF could be attached to the wrong reference.
• Removed iPadOS multi window support to improve shared PDF import reliability. Shared files now always open in a single Bookends window, ensuring import into the correct active library.

### 5.0.3 — 2026-03-11

• Fixed a bug where Smart Groups created in Bookends for iOS could be deleted during Wi-Fi sync with Mac.

### 5.0.2 — 2026-03-09

• Extracting and exporting PDF annotations has been redesigned, with new preview modes: structured preview, rich text view, and simple text view.
• Fixed an issue when sharing a PDF from Safari where Safari also sent the web page URL, causing the URL to be shared instead of the PDF. The Share dialog now shows two options: the app icon for sharing PDFs and an Export to Bookends action for sharing the web page.
• Fixed a bug where importing a new PDF and using Autofill by Value could create the reference twice.
• Fixed an issue where attachments containing certain punctuation characters synced via Wi-Fi were renamed incorrectly, which could cause the macOS version to overwrite the current attachment.

### 5.0.1 — 2026-02-21

• Create folders directly in your library, and add subgroups or subfolders using the contextual menu.
• New Move To option in group and folder contextual menus.
• Fixed a crash on app launch that affected some libraries.

### 5.0 — 2026-02-15

• iPad experience redesigned with a modern three-column interface.
• Share any web page from Safari and let AI extract metadata automatically (Apple Intelligence required, iOS/iPadOS 26+, Premium feature).
• Editing references in-place is now more intuitive with a cleaner, segmented interface.
• Autocomplete for authors, editors, journals, and keywords when entering new reference metadata.
• Manage attachment folders and subfolders in Settings, and easily move attachments between locations.
• Import BibTeX files.
• Enhanced Quick Add, and dozens of other improvements throughout the app.

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## Related topics

[jstor](https://appshunter.io/ios/topics/jstor) · [semantic scholar](https://appshunter.io/ios/topics/semantic-scholar) · [jstor daily](https://appshunter.io/ios/topics/jstor-daily)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*