It’s on the tip of my tongue, just give me a minute!” Let’s face it, the human brain is not the most reliable tool for keeping and retrieving information. Luckily, there are dozens of note-taking apps that can double as a powerful backup brain. The question is, which second brain app should you choose? The Notion vs. Obsidian debate is still up in the air, so let’s compare the two tools and see if they’re worth your time.