You should build for yourself
I just moved my personal Obsidian setup from a web wrapper into a native iOS app.
The app is simple on the surface: todos, notes, calendar, reminders, capture. The important part is where the data lives. My notes stay as markdown. Calendar and reminders use Apple's native APIs. The LLM layer runs through Apple's on-device Foundation Model, so the common queries and cleanup tasks can happen locally.
That changes how I think about personal software.
Most productivity apps ask you to reshape your life around their model: their database, their workflows, their assumptions. When you build for yourself, you can do the opposite. You can start with how your brain already works, where your notes already live, what you actually forget, and what you want the software to retrieve for you.
I think more folks should build these small personal systems now. Not because every app needs AI, but because capture, retrieval, and local models are finally good enough to make personal software feel worth the effort.
I wrote the longer version while building mine — read it on LinkedIn.