# Bookends vs BioEM 2026

The clearest difference is in-app purchases: BioEM 2026 at none against Bookends's 2. BioEM 2026 also leads on iOS requirement (13.0 vs 18.6). Bookends's advantage is device support. On price there is nothing between them.

Both are free to download. Bookends sells 2 in-app purchases, starting at $14.99 per year. BioEM 2026 asks for nothing beyond the download.

## The numbers

| Metric | Bookends | BioEM 2026 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (398 ratings)](https://appshunter.io/ios/app/bookends/id739087947/reviews)** | — |
| Number of ratings | **398** | — |
| Positive reviews | 76.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 114 MB | 12 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [Sonny Software, LLC](https://appshunter.io/developer/417583547) | [Poznan Supercomputing and Networking Center](https://appshunter.io/developer/726093818) |

## What reviewers say

### Bookends

[App page](https://appshunter.io/ios/app/bookends/id739087947)

Manage your research references and PDFs on your mobile device. Search online databases, import metadata, annotate PDFs, and organize your library. Offers basic functionality for free with optional one-time purchase and yearly subscription for advanced features like cloud sync and unlimited imports.

**Highlights:** 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

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $14.99 | per year |
| Standard | $14.99 | one-time |

**What reviewers like**

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

**What reviewers complain about**

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- 👎 Outdated and clunky user interface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

**Reported bugs**

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

**Requested features**

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


### BioEM 2026

[App page](https://appshunter.io/ios/app/bioem-2026/id6777997934)

**In-app purchases:** none


## Frequently asked questions

### Is Bookends free?

Bookends is free to download, with in-app purchases available.

### Is BioEM 2026 free?

BioEM 2026 is free to download, with no in-app purchases.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*