# RxCalc vs IDSA Practice Guidelines

The clearest difference is review sentiment: RxCalc at 53% against IDSA Practice Guidelines's 0%. RxCalc also leads on chart position (#119 vs unranked). IDSA Practice Guidelines's advantage is price (Free vs $2.99) and ratings volume (559 vs 5). On ads, in-app purchases and device support there is nothing between them.

IDSA Practice Guidelines is free to download; RxCalc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

IDSA Practice Guidelines holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: IDSA Practice Guidelines has 559 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 53% of RxCalc's written reviews are positive against 0% of IDSA Practice Guidelines's, so the app with the better star average is not the one people write more warmly about.

RxCalc ships an update every 25 months, IDSA Practice Guidelines every 7 months. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | RxCalc | IDSA Practice Guidelines |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.6 (5 ratings)](https://appshunter.io/ios/app/rxcalc/id321211290/reviews) | **[4.8 (559 ratings)](https://appshunter.io/ios/app/idsa-practice-guidelines/id1478886375/reviews)** |
| Number of ratings | 5 | **559** |
| Positive reviews | **53.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 7 months** |
| Monetization | Paid | **Free** |
| Best chart rank | **#119** | — |
| Size | 1 MB | 105 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Rob Fahrni](https://appshunter.io/developer/321211293) | [Infectious Diseases Society of America](https://appshunter.io/developer/1477996603) |

## What reviewers say

### RxCalc

[App page](https://appshunter.io/ios/app/rxcalc/id321211290)

**Currently charting:** #119 Top Paid · Medical (US App Store)

This medical app provides essential pharmacokinetic calculations for healthcare professionals. It offers a fast interface and comprehensive results to streamline dosing regimen design and patient-specific adjustments for medications like vancomycin and aminoglycosides.

**Highlights:** Pharmacokinetic calculations, Vancomycin dosing, Aminoglycoside dosing, Post-level adjustments, Fast interface, Comprehensive results

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

**In-app purchases:** none


### IDSA Practice Guidelines

[App page](https://appshunter.io/ios/app/idsa-practice-guidelines/id1478886375)

Access and stay updated with the latest clinical guidelines from the Infectious Diseases Society of America. This app offers interactive tools, search functionality, and the ability to bookmark key information and take notes for healthcare professionals.

**Highlights:** Access clinical guidelines, Interactive tools, Search guidelines, Bookmark pages, Take notes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RxCalc free?

RxCalc costs $2.99, with no in-app purchases.

### Is IDSA Practice Guidelines free?

IDSA Practice Guidelines is free to download, with no in-app purchases.

### Which has better reviews, RxCalc or IDSA Practice Guidelines?

IDSA Practice Guidelines is rated higher. RxCalc averages 4.6 out of 5 from 5 ratings, while IDSA Practice Guidelines averages 4.8 from 559 ratings.

### Do RxCalc or IDSA Practice Guidelines have ads?

Neither RxCalc nor IDSA Practice Guidelines shows ads.

### Which is updated more often, RxCalc or IDSA Practice Guidelines?

RxCalc ships an update every 25 months, and IDSA Practice Guidelines every 7 months. Most recently, RxCalc was updated on September 22, 2026 and IDSA Practice Guidelines on September 23, 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.*