An online app is a computer software that operates on a server and communicates by way of the Internet with a user's hardware. The application interface is usually a web browser installed on a PC, tablet or smartphone.

The realization of the application begins with the verification of the customer's documentation. Based on the analysis of the documentation, an introductory estimation is created, which is as well a preparatory project of the online application. It is an estimate presenting the quantity of expenditures to be aroused to project the software. Then, the design specification is created. It contains a definition of all parts and functionality, connections between application elements, math formulas, info for reports. Specification is an app project that includes a price estimate for every module, which is the ultimate estimation and the offer for application development. After accepting the project, app is developed due to the specification and practical design. If the design allows for the partition of larger entities, the software is introduced in stages. The software is put for trials in the development system. At this step, changes and corrections are made due to the project. After satisfying finishing of tests and consent of the entire product, the application is introduced on the client’s server and trials are repeated.

If everything works right, the application is introduced in the client's firm. As far as Polish custom software market is concerned, Objectivity Poland (from Wroclaw) is the most esteemed enterprise, also among foreigner partners.