SyReach Notes is described as 'personal Knowledge Management software. More than notes writing, connect notes, explain the context, write abstracts about common patterns, find solutions, and build your knowledge' and is an app in the Office & Productivity category. There are more than 50 alternatives to SyReach Notes for a variety of platforms, including Windows, Android, iPhone, Online / Web-based and Mac. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Microsoft OneNote. Other great apps like SyReach Notes are Evernote (Freemium), CherryTree (Free, Open Source), NoteLedge (Paid) and Trilium Notes (Free, Open Source).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.