# Using Both new and old apps **URL:** \ **Category:** Apps & Clients\ **Created:** [November 13, 2019, 1:13pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632 "2019-11-13T13:13:01Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![davidj](https://avatars.discourse-cdn.com/v4/letter/d/d2c977/32.png) [@davidj](https://community.smartthings.com/u/davidj)\ **Post date:** [November 13, 2019, 1:13pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632/1 "2019-11-13T13:13:01Z")
I have struggled to find an answer for this, but I have a complex setup with a lot of custom device handlers. I have seen numerous comments that some dont work in the new app. I wondered if installing the new app to see what happens will mess anything up? Thanks for advice ---
**Author:** ![Automated\_House](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/automated_house/32/99641_2.png) [@Automated\_House](https://community.smartthings.com/u/Automated_House)\ **Post date:** [November 13, 2019, 1:14pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632/2 "2019-11-13T13:14:59Z")
it will not mess anything up. just know the differences once it comes to the standard smart apps. > [@SPECIFIC differences between "SmartThings Classic" (the V2 app) and “SmartThings (Samsung Connect)” (the V3 app)](https://community.smartthings.com/t/specific-differences-between-smartthings-classic-the-v2-app-and-smartthings-samsung-connect-the-v3-app/124870): > > this thread is intended only as a listing of specific differences between the two apps, not for complaints, suggestions, discussions of design philosophy, bug reports, questions about migration, joke memes or anything else. Just individual feature differences. We originally used the abbreviation STSC for “SmartThings (Samsung Connect)”, but that never caught on, so now we are calling it the V3 app since it came out with the V3 hub. The V3 app is changing rapidly, so feel free to edit this as needed. The official knowledgebase FAQ is at the following link. Read it. wink[https://support.smartthings.com/hc/en-us/articles/360000114006-New-SmartThings-app-FAQ](https://support.smartthings.com/hc/en-us/articles/360000114006-New-SmartThings-app-FAQ) The “how to” official articles for the V3 app are at the following link: [https://support.smartthings.com/hc/en-us/categories/115…](https://support.smartthings.com/hc/en-us/categories/115000465506-SmartThings-App) ---
**Author:** ![davidj](https://avatars.discourse-cdn.com/v4/letter/d/d2c977/32.png) [@davidj](https://community.smartthings.com/u/davidj)\ **Post date:** [November 13, 2019, 1:30pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632/3 "2019-11-13T13:30:38Z")
Really appreciated. Thanks for advice. ---
**Author:** ![eric182](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/eric182/32/135465_2.png) [@eric182](https://community.smartthings.com/u/eric182)\ **Post date:** [November 13, 2019, 1:41pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632/4 "2019-11-13T13:41:23Z")
I still have DTHs that are not working in the new app. Probably will never get them working in the new app. ---
**Author:** ![JDRoberts](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/jdroberts/32/56577_2.png) [@JDRoberts](https://community.smartthings.com/u/JDRoberts)\ **Post date:** [November 13, 2019, 2:46pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632/5 "2019-11-13T14:46:47Z")
So far the one thing it can mess up is Geopresence if you are using that specific device as a presence sensor. I know it affects iOS devices, I’m not sure about android. Basically presence detection of an iOS device will not work properly in the new V3 app if you have both apps installed on that device. It will work OK if you have the V3 app on one device and the classic on a different device on the same account. So you can use both, it’s just that having both on the same iOS device currently causes presence in the V3 app to glitch. I think that’s the current issue, I didn’t run into it myself. @jkp ---
**Author:** ![davidj](https://avatars.discourse-cdn.com/v4/letter/d/d2c977/32.png) [@davidj](https://community.smartthings.com/u/davidj)\ **Post date:** [November 13, 2019, 6:07pm UTC](https://community.smartthings.com/t/using-both-new-and-old-apps/177632/6 "2019-11-13T18:07:29Z")
Ok thats fine, presence was so unreliable on the classic App I never used it anyway. We are an all Android family so maybe that will be an improvement. Lets see what works…