Best note taking app for agencies

There are roughly 40-60 note-taking apps with some level of traction (Notion, Evernote, OneNote, Apple Notes, Obsidian, Roam Research, LogSeq, etc.), but the category fractures hard when you add the 'for agencies' qualifier. The actual pain points aren't about features—it's about context switching. Agencies need: (1) client-specific workspaces that don't mix confidential data, (2) real-time collaboration without notification overload, (3) tight integration with project management tools (Asana, Monday, Linear), and (4) quick template systems for proposals and briefs that auto-populate from projects. Most existing apps either go too broad (Notion handles everything but agency workflows get buried in configuration hell) or too niche (specialized agency tools exist but lack the flexibility of a proper notes system). The actual gap is a purpose-built layer on top of existing note infrastructure—something that understands agency rhythms: client handoffs, project retrospectives, proposal templates, and team knowledge capture. A vibecoder entering this space should focus on two things: (1) agency-first information architecture (client → project → deliverable → notes structure) and (2) one seamless integration (probably with Asana or Monday) that makes adding context automatic, not manual.