# GIR Calc vs Red Book®

GIR Calc and Red Book® both sit at 4.8 stars, but that hides the real split: 100% of GIR Calc's written reviews are positive against 0% of Red Book®'s. GIR Calc also leads on in-app purchases (none vs 2) and update cadence (every 4 months vs every 11 months). Red Book®'s advantage is ratings volume (71 vs 5) and device support (4 vs 2). On price, rating and ads there is nothing between them.

Both are free to download. Red Book® sells 2 one-off in-app purchases. GIR Calc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for GIR Calc against 4.8 for Red Book®. That said, the two scores are not equally well evidenced: Red Book® has 71 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 100% of GIR Calc's written reviews are positive against 0% of Red Book®'s.

GIR Calc ships an update every 4 months, Red Book® every 11 months. The most recent releases landed on October 3, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | GIR Calc | Red Book® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/gir-calc/id660860969/reviews)** | [4.8 (71 ratings)](https://appshunter.io/ios/app/red-book/id1586673573/reviews) |
| Number of ratings | 5 | **71** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 11 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 9 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Atlas Software Solutions LLC](https://appshunter.io/developer/657195132) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### GIR Calc

[App page](https://appshunter.io/ios/app/gir-calc/id660860969)

Calculate the Glucose Infusion Rate (GIR) for single or multiple IV drips. This tool is designed for medical professionals, particularly those in pediatrics or neonatal ICUs, to quickly determine essential fluid and sugar infusion rates.

**Highlights:** Calculate GIR for single or multiple IV drips, Input weight in kg, Input sugar percentage and volume (ml/hr), Handles non-sugar containing fluids, Simple calculation button

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

**In-app purchases:** none


### Red Book®

[App page](https://appshunter.io/ios/app/red-book/id1586673573)

This app provides the latest information on pediatric infectious diseases from the American Academy of Pediatrics. It includes immunization schedules, vaccine status, influenza resources, and new chapters on COVID-19 and Mpox. Features like note-taking and enhanced search aid quick access to essential medical data.

**Highlights:** Immunization schedules, Vaccine status table, Influenza resources, COVID-19 and Mpox chapters, Note-taking and highlighting, Enhanced search functionality

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Red Book 32e | $99.99 | one-time |
| Red Book | $99.99 | one-time |


## Frequently asked questions

### Is GIR Calc free?

GIR Calc is free to download, with no in-app purchases.

### Is Red Book® free?

Red Book® is free to download, with in-app purchases available.

### Which has better reviews, GIR Calc or Red Book®?

GIR Calc is rated higher. GIR Calc averages 4.8 out of 5 from 5 ratings, while Red Book® averages 4.8 from 71 ratings.

### Do GIR Calc or Red Book® have ads?

Neither GIR Calc nor Red Book® shows ads.

### Which is updated more often, GIR Calc or Red Book®?

GIR Calc ships an update every 4 months, and Red Book® every 11 months. Most recently, GIR Calc was updated on October 3, 2026 and Red Book® on October 22, 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.*