# Respiration ID vs Plural eReader

The clearest difference is price: Plural eReader at Free against Respiration ID's $4.99. Plural eReader also leads on update cadence (every 6 months vs every 47 months) and ratings volume (14 vs 1). Respiration ID's advantage is rating (5.0 vs 1.0). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Plural eReader is free to download; Respiration ID costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Respiration ID holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Plural eReader has 14 ratings behind it against 1, so its average is the more settled of the two.

Respiration ID ships an update every 47 months, Plural eReader every 6 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Respiration ID | Plural eReader |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/respiration-id/id1060166421/reviews)** | [1.0 (14 ratings)](https://appshunter.io/ios/app/plural-ereader/id1618912006/reviews) |
| Number of ratings | 1 | **14** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 47 months | **Every 6 months** |
| Monetization | Paid | **Free** |
| Size | 35 MB | 131 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blue Tree Publishing, Inc.](https://appshunter.io/developer/496143325) | [Plural Publishing](https://appshunter.io/developer/1611581394) |

## What reviewers say

### Respiration ID

[App page](https://appshunter.io/ios/app/respiration-id/id1060166421)

Explore the anatomy of respiration with interactive animations and structure identification. Learn about the body, thorax, and lungs through touch-based learning and detailed text. Save and share your discoveries with the built-in drawing and screenshot tools.

**Highlights:** Interactive 3D respiratory anatomy models, Structure identification with text details, Animations of inhalation and exhalation, Larynx movement during breathing, Ribs and diaphragm interaction animation, Alveoli breathing animation, Drawing whiteboard with screenshot functionality

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Plural eReader

[App page](https://appshunter.io/ios/app/plural-ereader/id1618912006)

Access and read your purchased digital books and content offline. This app provides interactive tools like note-taking, highlighting, and search, along with support for embedded audio and video. Enjoy a flexible reading experience with adjustable text flow.

**Highlights:** Offline reading, Embedded audio and video, Note taking, Highlighting, Search within book, Adjustable text flow

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Respiration ID free?

Respiration ID costs $4.99, with no in-app purchases.

### Is Plural eReader free?

Plural eReader is free to download, with no in-app purchases.

### Which has better reviews, Respiration ID or Plural eReader?

Respiration ID is rated higher. Respiration ID averages 5.0 out of 5 from 1 ratings, while Plural eReader averages 1.0 from 14 ratings.

### Do Respiration ID or Plural eReader have ads?

Neither Respiration ID nor Plural eReader shows ads.

### Which is updated more often, Respiration ID or Plural eReader?

Respiration ID ships an update every 47 months, and Plural eReader every 6 months. Most recently, Respiration ID was updated on November 2, 2026 and Plural eReader on November 3, 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.*