Many banks have developed multiple customer-facing mobile apps to address specific use cases, offer a particular function, or roll out new services, but some banks are still building too many apps, boasting portfolios of over 20. Building and maintaining multiple apps is costly; getting customers to use multiple apps is challenging; and ensuring consistently good experiences across apps is no easy feat. This report outlines challenges that multiple apps pose for digital banking teams and sets out the questions digital leaders should ask before building another app. This report was originally published in September 2016; Forrester reviews and updates it periodically for continued relevance and accuracy.