SaaS is considered to be part of cloud computing, along with infrastructure as a service, platform as a service, desktop as a service, managed software as a service, mobile backend as a service, data center as a service, integration platform as a service, and information technology management as a service.
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SaaS has been incorporated into the strategy of nearly all enterprise software companies.
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DbaaS has emerged as a sub-variety of SaaS and is a type of cloud database.
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Consequently, the initial setup cost for SaaS is typically lower than the equivalent enterprise software.
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Key driver of SaaS growth is SaaS vendors' ability to provide a price that is competitive with on-premises software.
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Example, to support customers' common need to change an application's look-and-feel so that the application appears to be having the customer's brand, many SaaS applications let customers provide a custom logo and sometimes a set of custom colors.
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SaaS applications are often updated more frequently than traditional software, in many cases on a weekly or monthly basis.
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Several other SaaS applications let users vote on and offer new feature ideas.
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OpenSaaS refers to software as a service based on open-source code.
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Similar to SaaS applications, Open SaaS is a web-based application that is hosted, supported, and maintained by a service provider.
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One notable criticism of SaaS comes from Richard Stallman of the Free Software Foundation, who refers to it as Service as a Software Substitute.
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