Tandem t:slim Mobile App

Tandem t:slim Mobile App

t:slim X2 insulin pump

2.1K ratings
390 reviews
Free

Details

  • Released
  • Updated
  • May 4, 2026
  • August 27, 2026
Tandem t:slim Mobile App screenshot #1 for iPhone
Tandem t:slim Mobile App screenshot #2 for iPhone
Tandem t:slim Mobile App screenshot #3 for iPhone
Tandem t:slim Mobile App screenshot #4 for iPhone
Tandem t:slim Mobile App screenshot #5 for iPhone
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About

This app acts as a smartphone companion for a specific insulin pump, allowing users to deliver insulin doses and view pump data remotely. It provides discreet access to essential information and notifications, enhancing convenience for pump users.

✓Deliver bolus from smartphone
✓Discreet secondary pump display
✓View pump data and notifications
✓Wirelessly upload therapy data
✓Smartphone language support
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What users say about Tandem t

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What's New in Tandem t

2.13.1

August 27, 2026

Overall app performance updates

User reviews

App very rarely works

App is most times out of range 15 to 20 yimes a day even when within 1 foot of sensor. If it worked most times it would be great. I usually have to bolus from pump. I know the dexcom sensor works becsuse it transmits to pump most times but many time it dors not work either. Maybe it is sensors but has always happened since tslim app was available. ( try to make it better because when it works its great)
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Not super but better than nothing

The app disconnects more than it stays connected. I do like whenever it’s connected I can bolus from my phone. The ability to dismiss alerts from the app is limited to essentially one use case. Everything else I have to go to the actual pump and might as well not even get alerts in the app.

It’s helpful but limited

Update 24/9/26. I still don’t get why there is no ability to deal with the pumps warnings through the app if you allow me to deliver insulin through the app? I We are very capable insulin pump users so I shouldn’t need to go to my pump to answer a rising BG alarm/low battery alarm etc if I’m supposedly logged into the app. It’s about time you recognise your customer/patient needs.
Due a new pump and currently looking elsewhere as I have 25years experience of pumps and feel this company has stalled.

I didn’t want to use the app when first told about it. A couple of months later I decided to give it a go and found it immediately useful, particularly for monitoring my bloods (alongside the Dexcom g7 app) and the ability to deliver a correction bolus if needed.
What’s frustrating is the constant loss of connection to the pump when they are well within range - 30cm. Having to move the phone around to reconnect when it is clearly within range.
The G7 app stays connected all the time to the phone.
Also, why do I need to cancel notifications on the tslim if you’ve already given me the right to bolus from the app? Greater degree of risk remote bolusing than acknowledging a notification?
The ability to suspend the pump from the app should be enabled as well.
It’s a great start but usually you have to go back to the pump - which is very limiting. Takes away the whole ease of mobile functionality.
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How are the developers of this app not ready for iOS updates?

This app is very unstable. It’s a medical app. How is the team not ready for iOS updates? Makes me concerned about Tandem as a company in general. If they are this slow to release updates, how do I know that I can trust the insulin pump in general?

defective

being able to give boluses from the phone is enormously convenient. but it becomes less convenient when the pump NEVER has numbers. it always says "out of range" despite the pump and sensor being on the same side of ym body. what do tou psycopaths want?? and then because it never gets numbers, control-iq, the ONLY good feature of the pump, just doesnt work which results in CONSTANT lows or highs.
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Developer apps

User experience

🐞

Reported Bugs

4 issues

App crashes on launch

Bug

Pump battery draining rapidly

Bug

Glucose data not syncing properly

Bug

Repeated connection losses

Bug
✨

Requested Features

5 requests

Add extended bolus capability

Feature

Allow clearing of pump alarms from app

Feature

Integrate with Apple Health/Watch

Feature

Expand data history and customization

Feature

Improve app stability and reliability

Feature

FAQ

What does the Tandem t:slim mobile app do?

The app serves as a smartphone companion for the t:slim X2 insulin pump. It allows users to deliver insulin boluses directly from their phone, view pump data, and receive notifications. It also offers a discreet secondary display for pump status and can wirelessly upload therapy data to the cloud.

What are the key features of the app?

Key features include the ability to deliver a bolus from your smartphone, use your phone as a discreet secondary display for the pump, view pump data and receive push notifications, and wirelessly upload pump therapy data to the cloud. The app also supports smartphone language settings.

Is the Tandem t:slim mobile app free to use?

Yes, the app is free to download and use. It is a companion app designed to work with the t:slim X2 insulin pump and does not have any in-app purchases or advertisements mentioned in its description.

What are the compatibility requirements for the app?

To use the app, you need a t:slim X2 insulin pump from Tandem Diabetes Care and a compatible smartphone. Additional restrictions apply, and users should refer to the t:slim X2 insulin pump user guide for a comprehensive list of warnings and precautions.

Can I dismiss alerts and alarms from the app?

No, you cannot dismiss alerts and alarms directly from the mobile app. You must dismiss them on the t:slim X2 insulin pump itself. Once an alert or alarm is dismissed on the pump, it will then disappear from the mobile app display.