Yes, QuickBooks Online app is available to access your business data anywhere, anytime. To learn more about the features and pricing feel free to visit this page: QuickBooks Mobile Accounting. Also, I suggest visiting the Apps Store or Google Play, and from there, you can download the app. Let me show you how:
For iOS app:
Open the App Store on your device and search for QuickBooks Online. (It may not be available for some countries).
Select Free, then Install.
If you are already signed up for QuickBooks Online, use the same user ID and password to sign into the app.
You may be asked to confirm a one-time confirmation code to confirm your identity. Once confirmed, you can continue into your account.
If you're using an android phone:
Open Google Play on your device and search for QuickBooks Online. This app works on smartphones and tablets. (It may not be available in some countries).
Select Install.
If you are already signed up for QuickBooks Online, use the same user ID and password to sign into the app.
You may be asked to enter a one-time code to confirm your identity. Once confirmed, you can continue into your account.