# Elsevier eBooks on VitalSource vs Didactus

The clearest difference is in-app purchases: Elsevier eBooks on VitalSource at none against Didactus's 2. Didactus's advantage is iOS requirement (15.1 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Didactus sells 2 one-off in-app purchases. Elsevier eBooks on VitalSource asks for nothing beyond the download.

Elsevier eBooks on VitalSource ships an update every 3 months, Didactus every 6 weeks. The most recent releases landed on November 11, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Elsevier eBooks on VitalSource | Didactus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (9.4K ratings)](https://appshunter.io/ios/app/elsevier-ebooks-on-vitalsource/id1147791956/reviews)** | — |
| Number of ratings | **9.4K** | — |
| Positive reviews | 16.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 188 MB | 35 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Elsevier Inc.](https://appshunter.io/developer/367031326) | [KEITH MICHAEL BLEVINS](https://appshunter.io/developer/1872107809) |

## What reviewers say

### Elsevier eBooks on VitalSource

[App page](https://appshunter.io/ios/app/elsevier-ebooks-on-vitalsource/id1147791956)

Access and read Elsevier textbooks on your iOS device. Download books for offline study, search your entire library, and add notes and highlights. Sync your progress across devices for a seamless learning experience.

**Highlights:** Download books for offline reading, Search entire library, Create notes and highlights, Sync across devices, Pinch to zoom figures

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Convenient digital access
- 📚 Helpful study tools (e.g., flashcards)
- 👍 User-friendly interface

**What reviewers complain about**

- 🐛 Frequent login issues
- 📱 Poor mobile app experience
- 🔍 Difficult navigation and book access
- 🔊 Subpar text-to-speech quality
- 💻 Compatibility problems across devices

**Reported bugs**

- Repeated sentence/paragraph playback
- Highlighted text disappearing across devices
- Inability to download or access purchased books

**Requested features**

- Allow handwritten notes and annotations
- Improve page-turning and scrolling functionality
- Enhance diagram and image viewing experience
- Integrate seamless cross-device synchronization
- Provide more customization options (e.g., font, layout)


### Didactus

[App page](https://appshunter.io/ios/app/didactus/id6758306095)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LVN NCLEX Module | $39.99 | one-time |
| Registered Nurse NCLEX Prep | $69.99 | one-time |


## Frequently asked questions

### Is Elsevier eBooks on VitalSource free?

Elsevier eBooks on VitalSource is free to download, with no in-app purchases.

### Is Didactus free?

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

### Do Elsevier eBooks on VitalSource or Didactus have ads?

Neither Elsevier eBooks on VitalSource nor Didactus shows ads.

### Which is updated more often, Elsevier eBooks on VitalSource or Didactus?

Elsevier eBooks on VitalSource ships an update every 3 months, and Didactus every 6 weeks. Most recently, Elsevier eBooks on VitalSource was updated on November 11, 2026 and Didactus on November 9, 2026.

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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.*