The phrase "add-on application" is correct and usable in written English.
It can be used to refer to a software program that adds specific features or functionalities to an existing computer program.
Example: "The new add-on application enhances the capabilities of the main software, allowing users to customize their experience."
Alternatives: "plugin" or "extension".
Even though smartphones can be tricked out with thousands of add-on applications, only a few prove truly useful when it comes to organization.
The phone's selection of add-on applications isn't nearly as big as the iPhone's, but it is decent and growing quickly.
Outside their native Japan, emoji have been available to in-the-know smartphone owners for some time via add-on applications.
The concept of add-on applications long predates the iPhone; for a decade, hand-held devices made by Palm have had software as diverse as a bartending guide or a renal artery stenosis calculator for doctors.
Samsung and LG devices, which run on a mix of proprietary software and increasingly the Google-developed Android or Microsoft Windows Mobile operating systems, have struggled to match the Blackberry's e-mail functionality and the iPhone's user-friendly interface and wealth of add-on applications.
The company's new application packaging feature allows developers to create a compressed file for import into other MindTouch instances, letting enterprise users install add-on applications easily.
But just as on the desktop, it will be an open platform on top of which anyone can build add-on applications.
But since that time, widgets (small add-on applications) have moved online and gained plenty of buzz through their use on social networks and cultivation by Facebook, MySpace and most recently, Google 's OpenSocial standardized Web application platform.
Today, Network Hippo's basic service is free to use (with no advertising) but the company does plan to make money from add-on applications.
Running Palm OS 5.4.9 Garnet, it's compatible with thousands of add-on applications, but comes with enough built-in to be useful out of the box.
