# t vs GRI Calculator

The clearest difference is rating: GRI Calculator at 5.0 against t's 3.6. t's advantage is ratings volume (116 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GRI Calculator holds the better App Store score, 5.0 against 3.6. 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.

t ships an update every 2 months, GRI Calculator every 5 weeks. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | t | GRI Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (116 ratings)](https://appshunter.io/ios/app/tsimulator-app/id955568377/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gri-calculator/id6746769617/reviews)** |
| Number of ratings | **116** | 1 |
| Positive reviews | 42.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 31 MB | 18 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Tandem Diabetes Care, Inc.](https://appshunter.io/developer/955568376) | [Diabetes Technology Society](https://appshunter.io/developer/1367986985) |

## What reviewers say

### 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


### GRI Calculator

[App page](https://appshunter.io/ios/app/gri-calculator/id6746769617)

This professional tool helps healthcare providers quickly and accurately calculate the Glycemia Risk Index (GRI) using CGM data. It provides visual risk assessments and educational resources for comprehensive diabetes management.

**Highlights:** Instant GRI Calculation, Multi-Point Plotting, Visual Risk Assessment, Interactive Plot Visualization, Evidence-Based, Reference Ranges, Educational Resources

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is t free?

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

### Is GRI Calculator free?

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

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

GRI Calculator is rated higher. t averages 3.6 out of 5 from 116 ratings, while GRI Calculator averages 5.0 from 1 ratings.

### Do t or GRI Calculator have ads?

Neither t nor GRI Calculator shows ads.

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

t ships an update every 2 months, and GRI Calculator every 5 weeks. Most recently, t was updated on October 24, 2026 and GRI Calculator on October 30, 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.*