# ATA Calculator vs t

The clearest difference is price: t at Free against ATA Calculator's $2.99. t also leads on rating (3.6 vs 3.0) and ratings volume (116 vs 1). ATA Calculator's advantage is iOS requirement (11.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

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

t holds the better App Store score, 3.6 against 3.0. That said, the two scores are not equally well evidenced: t has 116 ratings behind it against 1, so its average is the more settled of the two.

ATA Calculator ships an update every 9 months, t every 2 months. The most recent releases landed on October 3, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ATA Calculator | t |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/ata-calculator/id890053714/reviews) | **[3.6 (116 ratings)](https://appshunter.io/ios/app/tsimulator-app/id955568377/reviews)** |
| Number of ratings | 1 | **116** |
| Positive reviews | — | 42.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 31 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [American Thyroid Association](https://appshunter.io/developer/890053717) | [Tandem Diabetes Care, Inc.](https://appshunter.io/developer/955568376) |

## What reviewers say

### 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


### t

[App page](https://appshunter.io/ios/app/tsimulator-app/id955568377)

Explore the features of an insulin pump's touchscreen interface without needing a prescription. This app is ideal for individuals with diabetes, their caregivers, or healthcare professionals to understand pump functionality.

**Highlights:** Explore touchscreen interface, Demonstrates pump features, No prescription required, Educational tool, Mobile device compatible

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Great for education and training
- 👍 Realistic pump interface replica
- 👍 Useful for pre-pump decision making
- 👍 Easy to use and understand
- 👍 Helpful for understanding the pump

**What reviewers complain about**

- 🐛 Simulator not interactive
- 🐛 Doesn't simulate real-world issues (occlusions)
- 🐛 Lacks confirmation screens and alarms
- 🐛 Not a true simulation of pump usage
- 🐛 Only shows basic functions

**Reported bugs**

- App won't open once downloaded
- Simulator crashes on launch
- App broken on iOS 12
- Simulator app broken on iOS 12
- Simulator crashes as soon as app is open

**Requested features**

- Actual app to control and manage the pump
- App available in Canada/Europe
- Display beep noises for alerts
- Simulate real-world issues like occlusions
- Ability to simulate changing the pump


## Frequently asked questions

### Is ATA Calculator free?

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

### Is t free?

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

### Which has better reviews, ATA Calculator or t?

t is rated higher. ATA Calculator averages 3.0 out of 5 from 1 ratings, while t averages 3.6 from 116 ratings.

### Do ATA Calculator or t have ads?

Neither ATA Calculator nor t shows ads.

### Which is updated more often, ATA Calculator or t?

ATA Calculator ships an update every 9 months, and t every 2 months. Most recently, ATA Calculator was updated on October 3, 2026 and t on October 13, 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.*