TL;DR (I tried to make it short, but I still have a lot to say 😭)

➡️ What's wrong with existing note-taking apps?
🔘 Too many options. I don't need so much test editing functionality. I just want to take notes and have simple markup (styling) functionality. Something like markdown or asciidoc.
🟣 Unwanted features. For example, I don't need AI to search for info in my notes. I only need a typical search engine. I don't want AI to write notes for me. I can write down my thoughts by myself.
🟡 Article-oriented mindset. Many note-taking apps look like you are going to write an article instead of just writing down the idea or a thought. When I see a blank screen with the cursor, I feel I need to write a document with a defined structure, style, and line of thought. It throws off the thoughts I wanted to write at the beginning.
I also recommend reading this blog post: Why build a messenger app only for sending to yourself?

➡️ Missing features
🔘 Desktop app. In the era of the web, I want a desktop app. Usually, the browser has dozens of opened tabs across multiple windows. It becomes hard to find the tab with notes.
🔴 Quake (drop-down) mode. I have used the Quake terminal since 2019. I like it a lot and the most pleasant feature is a drop-down mode. I set a keybinding to the F1 key and always have my terminal with me.
⚫️ Markdown. It is simple, easy to learn, and looks good. It contains a perfect set of styling and markup functionality for me.
🟡 Grouping into channels/spaces/folders/or anything like that.

So, as you can tell, I wrote my own app 😅

➡️ Teck stack.
🔘 Main programming language: Rust.
🔴 App framework: Tauri.
🔘 Frontend framework: Leptos (yes, frontend in Rust).
More about used technologies: tech_stack.md.

Enough talking! I bet you are already tired from all these longreads.
➡️ https://github.com/TheBestTvarynka/Dataans

After all, JavaScriptBridge with a few abstractions can be used for 2-way communication, so it works without WebSockets 🫥