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Amrik DasAmrik Das 

How to view your Salesforce1 App in different sized devices?

Sudhir Kumar MehtaSudhir Kumar Mehta
To simulate the actual devices' resolutions you may use Google Chrome's Developer Tools.
* First you need login to your salesforce account.
* Once logged in then goto https://<yourinstance>.salesforce.com/one/one.app
* Replace <yourInstance> with your instance (e.g: na4.salesforce.com/one/one.app).  You'll see the equivalent of the Salesforce1 mobile app within your window.
* Now goto Tools or More Tools => Developer tools in your google chrome.
* There you can see a mobile device icon.
User-added image
* Click on that and you see a nice canvas with Device picklist option to select a device.
User-added image
 
Amrik DasAmrik Das
Hi, Thanks. That's fine. But I wanna know if there's a way to check the app while i'm developing it.
Mudasir WaniMudasir Wani

Amrik you can add the below plugin for this purpose to your chrome 

Salesforce1 Simulator

https://chrome.google.com/webstore/detail/salesforce1-simulator/cknbjckicenodbiaejbmkjhldffonggp
Thanks