Only a few of the 1.3M patients treated in a hospital for a mental disorder in Germany/year receive necessary follow-up treatment. This leads to ≥33% in rehospitalization within the 1st year. To tackle this problem, mentalis provides evidence-based digital aftercare that combines algorithm-driven app-therapy and instant psychological tele-support. The conducted and ongoing clinical trials together with numerous partners show: mentalis programs are effective and patients improve significantly.