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.
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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Excellent concept, terrible execution
The idea of the app is absolutely phenomenal, as someone who has had type 1 diabetes for my entire life I often forget to bolus and this app fixed that problem for a while, after the first month or 2 however the app started to disconnect from my t-slim every few days, the process of having to connect it again is so tedious especially when Im just about to eat. The app also takes about 30 seconds to connect once first opening the app, this doesn’t sound bad but when you have to bolus multiple times a day it gets so annoying sitting on the app having to wait for it to connect every time. The rare time it properly works this app is one of the best things I have used diabetes wise in my life, I can use it in school and public without weird looks from people which I often get pulling my t-slim out, however it so rarely functions properly the user experience is horrible.
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Update needed!
We need this to work with the new iPhone 18 Pro. Of is the problem iOS 27?
Unreliable and Frustrating
How is it legal for a life saving medical device to have an app so poorly designed and managed?! Frequently loses connection, long term data is difficult to find, and important info isn’t available at all from the app. Nothing about it impresses. Anyone involved with building this app should be embarrassed.
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Was brilliant but stopped working
This was a completing game changer and made life so much easier. However, it’s not connected to my pump for about six weeks now. Q
Update this app
I need this app updated for iPhones with new iOS.
Used to be good
Always loses connection to my phone. Bluetooth gets disconnected constantly. Brand new pump, brand new phone. Reconnected many times. Always loses connection.
doesn’t really work anymore
ever since the new update, the pump doesn’t connect to app anymore, i have to re do the connection on the app/pump but even then it only works for a few hours
It works, sometimes
Sometimes it works and sometimes it doesn’t. Having to unpair and repair my pump to use the app is frustrating.
Good but needs improvement
When it works, it’s good and useful - obviously, dosing insulin from the app is a big help. It’s also great to have pump data automatically uploaded to tandem source. But the app frequently tells me that “pump connection lost from app just now.” I’ve frequently unpaired and repaired the app to the pump. There are some connectivity issues that need to be resolved/improved. Also it would be useful to set temporary basal or exercise modes from the app.
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No connection
Since up update last week, my pump will not stay connected to the app
Suggestion
Love this app. You should be able to turn activity mode on and off from the app and do more things that you can do on the pump.
Good but
Still missing a important feature like extended bolus, I would also love if u would to add a Apple Watch app so we can bolus from there like h can with the twist insulin pump, final thing is that I hope that u can add extended bolus but would love if u can do all the settings from the app such as changing profile, editing your basal amount, etc
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Slow to upgrade
Never had this issue before. But I always do the beta versions os iOS to test iOS before it’s released. I’ve never had an issue of using all my features of the tslim app. I currently can’t bolis from my phone. I have to do it on my pump. iPS is about to drop but there’s still not an update to be compatible with iOS 27. When are you gonna be compatible with apple again?
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App refuses to connect to pump after 2.13.1 update
App used to work OK, but after the 2.13.1 update in late August or early September 2026, the app refuses to connect with Bluetooth (or at least fails to display any information from the pump).
I tried unpairing and repairing my pump and it initially reconnected, but now the app failing to show any data from my pump
I tried unpairing and repairing my pump and it initially reconnected, but now the app failing to show any data from my pump
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Great when it works
The Bluetooth connection to the pump works maybe half of the time. The app and its features are nice and convenient I like it. But the inconsistent ability to connect are super irritating. Also would be nice to have access to all features on the pump, to edit profiles and basal rates in the app, but you can’t do that now.
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