The practical guide to diagnostics and therapy for sexually transmitted diseases (STIs) as an app, created and updated by the German STI Society (DSTIG). You will find the most important details and information on prevention, therapy and diagnostics of the most common STIs quickly and clearly. The guide is currently in its fourth edition and includes diseases such as HIV, syphilis, viral hepatitis, gonorrhea, chlamydia and many more. In particular, recommendations for special groups of patients, such as pregnant women and newborns, are readily available. In addition, the guide provides practical tips on pre-exposure prophylaxis (PrEP) and post-exposure prophylaxis (PEP) for HIV. You will also find information on vaccination recommendations, advice from partners and assistance for basic STI advice and clinical examinations in the STI context.