Comparison

t vs iLet App

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

iLet App

This app displays real-time data from an automated insulin delivery system, including glucose levels and trends. It supports data synchronization, reporting, and updates for the connected device, and allows sharing information with healthcare providers.

Highlights
  • Real-time glucose and trend display
  • Data synchronization and reporting
  • Device updates
  • Healthcare provider data sharing
  • Automated insulin dosing decisions
  • No carb counting required
  • Learns individual insulin needs
Read full description

The iLet App is part of the iLet Bionic Pancreas system, an automated insulin delivery system that reduces the need to make decisions about your diabetes management – because it makes the decisions for you. The iLet needs only one number – your weight. After startup, the iLet learns about YOU – your basal insulin needs, how to correct you to target, and how much insulin you need for your meals. The goal of the iLet is to reduce the burden of diabetes management. The iLet Bionic Pancreas is the only insulin delivery system that makes 100% of your dosing decisions – so you don’t have to. -No carb counting* Instead of carb counting everything on your plate, the iLet just needs an estimate of the carbs in your meal — Usual for me, More or Less. -No corrections The iLet makes the corrections for you. If you’re trending high, it will automatically give you more insulin to bring you back in range. If you’re trending low, it will reduce your current insulin dosage. -Dosing decisions made for you The “Bionic” part of the iLet that communicates with your CGM and makes all of the insulin dosing decisions—no carb counting, no correction factors, no adjustments. -No pre-set basal rate iLet learns your needs and automatically adjusts your basal rate on the go. -Simple setup No settings are required to be entered or adjusted—the iLet system only needs your weight to get started. -Small but mighty Small (1.9” x 3.6” x 0.6”), lightweight and easy to put in your pocket or clip to your clothing. -Talks to your CGM Your iLet device communicates directly with your Dexcom CGM or FreeStyle Libre 3 Plus sensor to know where your glucose is headed. -Water resistant If you drop your iLet in water—no problem! It’s protected in up to 12 feet of water for up to 30 minutes. -iLet App The iLet App displays data from your iLet home screen in real time so you can view your current glucose, trend, notifications, and other important information directly on your phone. It also supports data synchronization, reports and updates for your iLet and allows you to share your data with your healthcare provider. -Create your Bionic Circle With the Bionic Circle App, up to 10 friends and family can remotely monitor you to see CGM values, meal announcements, and insulin doses and to receive alerts (Urgent Low / Urgent / Low Soon / Low/High / No Data). Please note that any changes made to your iLet therapy settings should be done under the guidance and supervision of a qualified healthcare professional. Before making any adjustments, it is important to consult with your doctor to ensure that the changes are appropriate for your individual needs and health status. *User must be carb aware For safety information, visit www.betabionics.com/safety

Screenshots

t3 screens
iLet App4 screens

Verdict

The call

The clearest difference is rating: iLet App at 4.3 against t's 3.6. iLet App also leads on review sentiment (65% vs 42%). t's advantage is device support (3 vs 1). On price, ratings volume, update cadence and ads 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

iLet App holds the better App Store score, 4.3 against 3.6. Both are backed by a comparable volume of ratings — 116 and 115 respectively. Written reviews point the same way: 42% of t's written reviews are positive against 65% of iLet App's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
t versus iLet App: the parameters behind the verdict, then further details
ParametertiLet App
PriceFreeFree
Rating3.6 (116 ratings)4.3 (115 ratings) — better
Positive reviews42.4% of reviews64.5% of reviews — better
Number of ratings116 — better115
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better16.0
Further details — not scored
Size31 MB169 MB
Age rating4+4+
DeveloperTandem Diabetes Care, Inc.BetaBionics

Customer experience

t

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

iLet App

All ratings84 ratings
Positive84.5%
Neutral7.1%
Negative8.3%
Written reviews31 reviews
Positive64.5%
Neutral12.9%
Negative22.6%

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

iLet App

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

t

No in-app purchases

None

iLet App

No in-app purchases

Questions

Is t free?
t is free to download, with no in-app purchases.
Is iLet App free?
iLet App is free to download, with no in-app purchases.
Which has better reviews, t or iLet App?
iLet App is rated higher. t averages 3.6 out of 5 from 116 ratings, while iLet App averages 4.3 from 115 ratings.
Do t or iLet App have ads?
Neither t nor iLet App shows ads.
Which is updated more often, t or iLet App?
t ships an update every 2 months, and iLet App every 2 months. Most recently, t was updated on November 1, 2026 and iLet App on November 3, 2026.

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