Comparison

t vs GRI Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

t

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
Read full description

The t:simulator™ App is an easy way to explore the simple touchscreen interface of the t:slim X2™ Insulin Pump from Tandem Diabetes Care, no prescription or insurance verification required! Whether you’re a person living with diabetes, a relative or caregiver, or a healthcare provider, we make it simple to explore the t:slim X2 Pump’s features on your mobile device. THIS APPLICATION IS FOR DEMONSTRATION PURPOSES ONLY. IT SHOULD NOT BE USED FOR THERAPY DECISIONS. Due to the variety of sizes of compatible devices, the t:simulator App may not display the pump at actual size. Actual size is 2” x 3.13”. Please refer to the Technical Specifications in the Resources section of the app for more detailed information.

About

GRI Calculator

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
Read full description

GRI Calculator - Glycemia Risk Index - For Healthcare Professionals Calculate the Glycemia Risk Index (GRI) quickly and accurately with this professional tool designed for clinicians managing patients with diabetes. Overview The GRI Calculator enables healthcare providers to assess glycemic control quality by analyzing continuous glucose monitoring (CGM) data. Simply input the percentage of time spent in VLow, Low, VHigh, and High glucose ranges from a standard 14-day Ambulatory Glucose Profile (AGP) report. Key Features Instant GRI Calculation - Get immediate results with hypoglycemia and hyperglycemia component breakdowns Multi-Point Plotting - Plot multiple patients or multiple points over time Visual Risk Assessment - View color-coded risk zones from A (minimal risk) to E (severe risk) Interactive Plot Visualization - See the GRI plotted on a clear, easy-to-read graph Evidence-Based - Built on peer-reviewed research published in the Journal of Diabetes Science and Technology Reference Ranges - Quick access to glucose range definitions for VLow, Low, VHigh, and High Educational Resources - Comprehensive reference section with links to relevant scientific articles Professional Use This calculator is intended for use by healthcare professionals as part of comprehensive diabetes management. GRI values help clinicians quickly identify patients who may need treatment adjustments, providing a standardized metric for assessing glycemic variability and risk. Privacy First No personal or patient data is collected, stored, or transmitted. All calculations are performed locally on your device. Important Note This app is for informational and educational purposes only. It should not replace clinical judgment or be used to make treatment decisions without proper medical consultation. Always base clinical decisions on complete patient assessment.

Screenshots

t3 screens
GRI Calculator4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
t versus GRI Calculator: the parameters behind the verdict, then further details
ParametertGRI Calculator
PriceFreeFree
Rating3.6 (116 ratings)5.0 (1 ratings) — better
Positive reviews42.4% of reviews—
Number of ratings116 — better1
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details — not scored
Size31 MB18 MB
Age rating4+12+
DeveloperTandem Diabetes Care, Inc.Diabetes Technology Society

Customer experience

t

All ratings116 ratings
Positive62.1%
Neutral9.5%
Negative28.4%
Written reviews66 reviews
Positive42.4%
Neutral4.5%
Negative53.0%

GRI Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

t

Reported bugs

13 issues
  • 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
Show 8 more
  • Simulator not working
  • App crashes when opening on iPhone X
  • Simulator crashes on iOS 12
  • Simulator doesn't work
  • App bombs on launch
  • Lagging and not working properly
  • Doesn't update as often
  • US version installed on iPhone, needs German version

Requested features

14 requests
  • 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
Show 9 more
  • Bolus from the app
  • Option to change mmol/l to mg/dl
  • Bluetooth control of the pump
  • App to upload reports from the pump for iPad
  • Integrate with Apple Watch for alerts
  • Actual app that sends information to phone
  • Simulate confirmation screens and alarms
  • More realistic simulation of pump usage
  • Display insulin on board information

GRI Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

t

No in-app purchases

None

GRI Calculator

No in-app purchases

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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