A second brain is basically an external memory for your real brain. Somewhere to dump ideas, research, notes, decisions and things you want to remember later, without relying on yourself to remember where you put them.

That was the part normal note apps kept failing at for me. I could save almost anything, but months later I still had to remember that the note existed before I could find it. While building apps I was generating architecture notes, PRDs, debugging writeups, feature ideas and random thoughts constantly. I wanted them to organize and connect themselves instead of slowly turning into another pile of documents.

So I built Cohestry. It uses on-device intelligence to understand notes, then a deterministic system connects related ones automatically. Those connections have already resurfaced old ideas I had completely forgotten about.…