# Tandem t:slim Mobile App — user reviews > 369 indexed App Store user reviews of Tandem t by Tandem Diabetes Care Inc., rated 3.10/5 from 2,123 ratings. - Source: https://appshunter.io/ios/app/tandem-tslim-mobile-app/id1455916023/reviews - App overview in markdown: https://appshunter.io/ios/app/tandem-tslim-mobile-app/id1455916023.md - Rating breakdown: 5★ 580 · 4★ 372 · 3★ 341 · 2★ 309 · 1★ 521 ## What do users think of Tandem t? Overall sentiment: neutral **Pros** - 🚀 Convenient mobile bolus - 📊 Helpful data visualization - 🤳 Discreet pump management - 🔋 Reasonable battery impact - 🎉 Game-changing technology **Cons** - 🔌 Frequent connection issues - 🕰️ Annoying time mismatch alerts - 🔒 Limited pump control - 🔍 Missing key features (extended bolus, alarms) - 🐛 Buggy and unstable at times **Commonly reported bugs** - App crashes on launch - Pump battery draining rapidly - Glucose data not syncing properly - Repeated connection losses **Most requested features** - Add extended bolus capability - Allow clearing of pump alarms from app - Integrate with Apple Health/Watch - Expand data history and customization - Improve app stability and reliability ## Newest reviews (16 of 369) ### 2/5 — More customization *2026-09-02, version 2.13.1* I just started an insulin pump, as a diabetic which is super cool! But the lack of features like setting your exercise or sleep schedule, or even turning on dark mode from inside the app is SUPER ANNOYING! I went with the X2 /specifically/ because I wouldn’t have to change it as often which is great but the fact that I have to activate sleep mode from the pump itself gets me annoyed. I shouldn’t have to dig my pump out from wherever I have it to activate sleep mode just so I can SLEEP! MOBI users get to active sleep and exercise from their app so why can’t X2 users? And NO, I don’t want to talk to anyone from the tech team tandem, I want you to update the app to have these features because I know you can! Update: App QoL updates can include a built in calculator like the pump itself has and a way to activate activities from the app w/o needing to unlock the pump. Again, I don’t want to talk to the tech team, I want you to bring this review directly to them and ask “Is this possible for our diabetic patients?” Update 2: Connection issues GALORE with the newest app update. Can’t y’all get /anything/ right? ### 4/5 — Suggestion *2026-08-27, version 2.12.1* I wish that this app would connect to Siri, so that while I’m driving by myself or too busy to manually bolus I can tell her to do it for me. This would be a huge lifesaver and such an amazing feature. I feel that there are also so many other people besides me that would benefit from this! ### 3/5 — Solide *2026-08-20* Der Prozess, die Pumpe mit der App zu verbinden war bei mir leider sehr anstrengend. Es dauerte lange und die Pumpe musste ausgetauscht werden. Man muss sich hier und dort anmelden, da und hier runterladen, Videos schauen etc. etc. Das updaten ist wirklich mies gemacht und wird auf der Website gelobt… verstehe ich nicht… Nun gut. Die App macht was es soll. Man kann damit einen Bolus abgeben. Heutzutage ist die Technik der Pumpen schon sehr weit voraus und die X2 hinkt hinterher. Die App ist gut, übersichtlich und macht was es soll. Man kann damit einen Bolus abgeben, den BZ korrigieren und bekommt Alarme direkt aufs Handy. Den Bolus per App unterwegs eingeben zu können hilft mir sehr und macht meinen Alltag leichter. Die ist genauso wie bei jedem AID System, was es schon seit vielen Jahren gibt… ohne die Dexcom g7 App würde ich diese App aber niemals verwenden. Dafür verliert sie zu schnell den Kontakt zur Pumpe. Im Sekundentakt… außerdem kriegt man wirklich viele Alarme hintereinander. Man kann das nur schlecht einstellen und nicht pausieren und wird doppelt zugespamt, da die Pumpe ja auch alarmiert bzw. vibriert… das nervt. Ansonsten solide. Sollte man unbedingt benutzen, wenn man die X2 hat. Aber Tandem hinkt halt ordentlich den anderen Pumpen hinterher… **Developer response:** Thank you for letting us know about your experience. We encourage you to contact our Software Support Team directly at +1 (877) 801-6901 or if you’re located outside of the United States, please contact your local distributor directly at tandemdiabetes.com/contact-us/international-distributors and they will be able to assist further. ### 3/5 — Gut aber fehlen 2-3 Funktionen um sinnvoll zu sein *2026-08-09* Die App macht schon das Leben einfacher, da man nicht mehr ständig an die Pumpe muss aber nur Bolus abgeben zu können ist nicht Sinnvoll wenn man später doch an die Pumpe gehen muss um zb eine Aktivität zu starten. Für mich fehlen einige Funktionen. Ich hoffe, dass Sie daran arbeiten, da sie meiner Meinung nach die App erst richtig komplett machen würden: 1- Warum ist es nicht möglich, die Insulinabgabe über die App zu stoppen oder fortzusetzen? Das ist manchmal notwendig, und die Pumpe dafür herauszuholen – jetzt, wo ich die App habe – ist einfach nervig. :-( 2- Das ist mir sogar noch wichtiger: Warum kann ich meine persönlichen Pumpenprofile nicht über die App ändern?! Das ist die Funktion, die ich am häufigsten nutze, besonders vor dem Sport. Auch das wäre für mich eine absolute Pflichtfunktion für die App. 3-Es wäre zumindest großartig, wenn man die Sport-Aktivität über die App aktivieren könnte. Vielen Dank im Voraus für Ihre Antwort und hoffentlich baldige App-Updates. ### 2/5 — Operating at half potential *2026-08-08, version 2.12.1* This app, although very convenient is only partially completed. The app allows you to bolus from your phone, but will not allow you to acknowledge and cancel the alerts that constantly arise during pump operation. This forces you to bring out the pump and manually acknowledge and cancel the alarm that has been beeping, at usually the most inopportune time. The software team at Tandem should finish the job and upgrade this app with total capacity to run your pump discretely from your phone. ### 4/5 — Has potential *2026-08-06, version 2.12.1* It works well in general. It needs extended bolus and exercise mode activation. ### 4/5 — Great App *2026-08-06, version 2.12.1* Love this app, everyone should use it, very good! I would like to see it also have extended bolus function and activity function added to it in Canada. ### 4/5 — Great app *2026-07-22, version 2.12.1* Great app for my pump although one major downside is it is missing extended bolus and it would be amazing if they added a Apple watch app . ### 4/5 — Just needs a widget *2026-07-17, version 2.12.1* I love having the option to bolus from my phone. Would be nice if more pump features were available in the app. A widget that I could add to my Home Screen to show my glucose with the directional arrow would be innovative. I can see the remaining fuel and mileage I can travel in my car with a widget, and having the option to add my blood sugar reading on my phone screen would be a game changer. Please share with your developers. ### 3/5 — Schnell installiert aber leider kein Sync ins Tandem Konto *2026-07-12* Software Update an der Pumpe und App Installation waren schnell erledigt. Leider erfolgt bei uns keine Synchronisation in das Tandem Konto. Wir hatten gehofft die Daten von der Pumpe jetzt auch online verfolgen zu können wenn unser Kind in der Schule oder beim Sport ist. **Developer response:** Thank you for letting us know. This isn’t the experience we want for you. Please reach out to support anytime at 877-801-6901. If you're outside the U.S., contact your local distributor at tandemdiabetes.com/contact-us/international-distributors. ### 4/5 — Yes *2026-07-07, version 2.12.1* I like the app but would REALLY like to be able to see the date/time the cartridge was last changed like you can see when your CGM was last changed please! It would be so much more convenient than it is now to have to go into the pump and go through a bunch of screens to see when you last replaced the cartridge. ### 2/5 — More customization *2026-07-05, version 2.12.1* I just started an insulin pump, as a diabetic which is super cool! But the lack of features like setting your exercise or sleep schedule, or even turning on dark mode from inside the app is SUPER ANNOYING! I went with the X2 /specifically/ because I wouldn’t have to change it as often which is great but the fact that I have to activate sleep mode from the pump itself gets me annoyed. I shouldn’t have to dig my pump out from wherever I have it to activate sleep mode just so I can SLEEP! MOBI users get to active sleep and exercise from their app so why can’t X2 users? And NO, I don’t want to talk to anyone from the tech team tandem, I want you to update the app to have these features because I know you can! Update: App QoL updates can include a built in calculator like the pump itself has and a way to activate activities from the app w/o needing to unlock the pump. Again, I don’t want to talk to the tech team, I want you to bring this review directly to them and ask “Is this possible for our diabetic patients?” ### 1/5 — Terrible *2026-07-02, version 2.12.1* Randomly stopped accepting my libre 2 plus sensors with no prior warning and didn’t let me update the pump before to use the libre 3 plus sensor. Absolutely criminal. Now I’m stuck with a libre 2 plus sensor that won’t work. What a terrible company and product. Switching to another company and product asap. Unbelievable. ### 3/5 — Stop telling me to verify my time *2026-07-01, version 2.12.1* Seriously stop sending me the damn "Verify the time on your pump" notification, it's the right time off by ONE MINUTE, like goddamn make it so it detects like a 5 minute gap instead or a 2 minute gap. ### 1/5 — Sandysanjon *2026-07-01, version 2.12.1* It stinks. Half the time it loses connection and when that happens it won’t give you the basil dose. Not reliable ### 3/5 — Request for notes option *2026-06-27, version 2.12.1* I really wish there was a way to add time stamped notes in the app, especially regarding blood glucose readings compared to my CGM. ## Most critical reviews (10 lowest-rated) ### 1/5 — Bluetooth connection lost *2026-09-02, version 2.13.1* This latest update has stopped the app working. The Bluetooth connection doesn’t stay connected for more than 2 minutes. Please fix ### 1/5 — Won’t stay connected *2026-08-28, version 2.13.1* Won’t stay connected on latest update. App is unusable. ### 1/5 — 2.13.1 “critical alerts” *2026-08-28, version 2.13.1* Update prompts you to accept critical alerts, now the whole app doesn’t work, even if it did, if this app only works with critical alerts now I will switch cgms, making critical alerts non optional makes you feel like a ticking time bomb around your friends and is not needed when you’ve had diabetes for multiple decades, let people choose this is ridiculous ### 1/5 — Notification update *2026-08-19, version 2.12.1* They need to prolong the notification updates to be longer then what they are at the moment, to be notified that your low every 5 minutes with a high pitched noise at 3am or in public is embarrassing especially as it takes longer than that for your body to react to whatever it is you’ve ingested to help the situation, it also doesn’t help when linked with the Dexcom sensor and have that going off as well, I sound like an ice cream van!! ### 1/5 — fix your app *2026-08-16, version 2.12.1* dosent even work half the time just says "pump connection lost" ### 1/5 — Dr *2026-08-15, version 2.12.1* The app is fine in everyday use. Just don’t try to use the “Help” function’!! This will just take you round and round in circles without providing any helpful information at all. FAQs do not exist despite what it says on the menu. Worse still Tandem have been aware of this for ages but have done nothing about it!! So much for “making life easier for diabetics” ### 1/5 — Never connected *2026-08-10, version 2.12.1* It’s super convenient to bolus and check my blood sugar when it’s working, but it is almost never actually connected to my pump. When it does work, though, there isn’t an option to do extended bolus. The notifications are out of control too—I swipe it away and then it’s immediately notifying me again and again. The app is basically useless though because it’s never connected. It’s been several days since my pump and the app have had connection. Seriously considering switching from tandem now that my warranty is up because of how poorly the app runs, considering the power button on my pump hardly presses, the charging cover doesn’t close anymore, and I’ve already had to replace the pump once for just completely shutting down. ### 1/5 — I need help *2026-07-29, version 2.12.1* It says it connected but when I try and since my data and actually use the pp it won’t let me , I’ve tried everything that the doctors and website had told me to do, it says it is a technical issue error ### 1/5 — Pump Real-time Data?? *2026-07-25, version 2.12.1* Your competition has near realtime pump, insulin data telemetry; how about a caregiver app that lets us help our kids maintain sites, pump battery, insulin levels… y’all are so slow on features 😑 ### 1/5 — The Software *2026-07-16, version 2.12.1* Is there a way that you the builders of the app can help improve the experience of this app on IOS 27 software? Because I’ve tried to use the insulin pump amount function and it doesn’t work and I’m getting a new iPhone tomorrow and would like to be ready as soon as possible. Pls and thank you ## Most praised reviews (10 highest-rated) ### 5/5 — Sehr praktisch *2026-08-21* Ich finde die App wirklich gut. Es stehen viele Infos zusammengefasst an einem Ort und das auch noch recht übersichtlich. Bis jetzt habe ich absolut nichts zu meckern 👍🏻⭐️ ### 5/5 — viel besser als Medtronic *2026-07-23* Bolus über die App abzugeben, erleichtert vieles, sehr praktisch. ### 5/5 — Nach langem warten *2026-07-16* Endlich ist das Update da. Das einrichten ging schnell und problemlos. Hätte auch ohne die Einweisung funktioniert. Keine Probleme beim Verbinden. Hoffentlich bleibt es so. ### 5/5 — Genuinely impressed *2026-07-09, version 2.12.1* Works super well and there is almost no delay when bolusing. It seems to reconnect to the pump everytime I open the app but it take about 5 seconds so I don't mind it. One suggestion would be to have the bg numbers appear higher or lower instead of directly on the dots of the graph. As it is now its hard to see the tendency as the green "star" covers multiple dots especially if you checked it multiple times. ### 5/5 — 🙏 *2026-06-26* Supereinfache Installation. Erster Eindruck ist absolut positiv. Ein Riesenstück Lebensqualität dazu bekommen - ich bin soooo dankbar😘 ### 5/5 — Poor Software *2026-06-26, version 2.12.1* This app does not let you zoom in on features to view the graph. It basically just shows you if you are over or under your target number ### 5/5 — App update *2026-06-22, version 2.12.1* Great experience. Would it be possible in iOS 27 to ask Siri to give me a bolus or change activity mode? That would be very helpful. Thanks for a great product. ### 5/5 — Revolutionary! *2026-05-18, version 2.12.1* Absolutely love the app, being able to bolus from my phone makes life so much easier for me, in public and my blood sugars are high? Can just fix it on my phone, At work, at a party, makes life easier and more convenient, and reduces the anxiety and judgement of blousing in public spaces ### 5/5 — Endlich da!! *2026-05-16* Sehr schön umgesetzt. Sehr übersichtlich und Bolusabgabe einfacher als über die Pumpe. Wenn man in Zukunft irgendwann Meldungen bestätigen kann und vielleicht Aktivität über die App einstellen kann -ein Traum. **Developer response:** We appreciate you taking the time to share your feedback with us here. While we can’t speak to future features, we’ll be sure to share your comments with our development team. Please don’t hesitate to reach out with any questions. Contact our Software Support Team directly at +1 (877) 801-6901 or if you’re located outside of the United States, please contact your local distributor directly at https://bit.ly/4q9ePPH. ### 5/5 — Mobile App *2026-05-15* Das warten hat sich definitiv gelohnt. Das Update war leicht zu installieren. Die Bolus Abgaben sind einfach durchzuführen. Ansichten in der App sind hell und übersichtlich gestaltet. Vielen Dank !!! --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*