Yes, QBO is a good alternative when using disparate devices among employees. QBO is online software as a service and thus can be accessed by any registered user from ANY internet connected device by using, as @MarshallA suggested, Chrome browser as browser of choice. There are downloadable apps even for ipads and phones but the downloaded apps lose some of the functionality and full features of browser connected.
One downside, easily combated, is that you need to be connected to the internet to use QBO, but almost everyone now has a phone with mobile hotspot capability that they could use in combination with their laptop of choice. I can attest to this type of access working very well - in fact many times faster than my DSL home internet
