Bank X is described as 'Online-banking made easy, using HBCI PIN/TAN' and is an app in the Business & Commerce category. There are more than 25 alternatives to Bank X for a variety of platforms, including Windows, Mac, Linux, iPhone and Android. The best alternative is GnuCash, which is both free and Open Source. Other great apps like Bank X are Ledger (Free, Open Source), MoneyMoney (Paid), Banktivity (Paid) and Linxo (Freemium).
Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line. This may put off some users, since there is no flashy UI, but for those who want unparalleled reporting access to their data there are few alternatives.
Banktivity is a personal and small business financial manager designed to manage bank accounts, credit cards and investments, analyze income and expenses with live updating charts, and plan your financial future with budgeting and forecasting.