# NCCN Guidelines® vs ATA Calculator

The clearest difference is price: NCCN Guidelines® at Free against ATA Calculator's $2.99. NCCN Guidelines® also leads on rating (3.6 vs 3.0) and update cadence (every 2 months vs every 9 months). ATA Calculator's advantage is iOS requirement (11.0 vs 13.1). On ads, in-app purchases and device support there is nothing between them.

NCCN Guidelines® is free to download; ATA Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NCCN Guidelines® holds the better App Store score, 3.6 against 3.0. That said, the two scores are not equally well evidenced: NCCN Guidelines® has 24 ratings behind it against 1, so its average is the more settled of the two.

NCCN Guidelines® ships an update every 2 months, ATA Calculator every 9 months. The most recent releases landed on October 14, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | NCCN Guidelines® | ATA Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[3.6 (24 ratings)](https://appshunter.io/ios/app/nccn-guidelines/id775500217/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/ata-calculator/id890053714/reviews) |
| Number of ratings | **24** | 1 |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | **Free** | Paid |
| Size | 118 MB | 2 MB |
| Requires iOS | 13.1 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [National Comprehensive Cancer Network®](https://appshunter.io/developer/1168594705) | [American Thyroid Association](https://appshunter.io/developer/890053717) |

## What reviewers say

### NCCN Guidelines®

[App page](https://appshunter.io/ios/app/nccn-guidelines/id775500217)

This app provides healthcare professionals with convenient access to comprehensive clinical practice guidelines for oncology. It aims to improve the quality and effectiveness of cancer care by offering evidence-based recommendations for diagnosis, treatment, and supportive services.

**Highlights:** Virtual Library of NCCN Guidelines, Oncology clinical practice guidelines, Evidence-based recommendations, Supports cancer care decision-making, Covers 97% of US cancer cases

**Features:** Vision Pro support

**In-app purchases:** none


### ATA Calculator

[App page](https://appshunter.io/ios/app/ata-calculator/id890053714)

This medical app provides thyroid nodule calculators to assist healthcare providers in guiding treatment decisions for thyroid disease and cancer. It offers recommendations based on current evidence and expert opinion, but emphasizes that it is a tool to supplement, not replace, physician judgment.

**Highlights:** Thyroid nodule calculators, Guidance for thyroid disease and cancer, Evidence-based recommendations, Supports clinical judgment, Developed by American Thyroid Association

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

**In-app purchases:** none


## Frequently asked questions

### Is NCCN Guidelines® free?

NCCN Guidelines® is free to download, with no in-app purchases.

### Is ATA Calculator free?

ATA Calculator costs $2.99, with no in-app purchases.

### Which has better reviews, NCCN Guidelines® or ATA Calculator?

NCCN Guidelines® is rated higher. NCCN Guidelines® averages 3.6 out of 5 from 24 ratings, while ATA Calculator averages 3.0 from 1 ratings.

### Do NCCN Guidelines® or ATA Calculator have ads?

Neither NCCN Guidelines® nor ATA Calculator shows ads.

### Which is updated more often, NCCN Guidelines® or ATA Calculator?

NCCN Guidelines® ships an update every 2 months, and ATA Calculator every 9 months. Most recently, NCCN Guidelines® was updated on October 14, 2026 and ATA Calculator on October 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.*