A markdown editor with live preview and local storage is genuinely one of the simpler builds on this whole register — mature, well-documented libraries handle the editor itself, leaving mostly straightforward CRUD underneath.
Build it
Effort: an eveningRunning cost: $0/mo to start
Why CanICodeThis says Build it
A markdown editor with live preview using an existing library (CodeMirror or Tiptap with a markdown mode) is mature, well-documented territory
Storing notes as plain local markdown files, or rows in a simple database, is ordinary CRUD
Tags parsed directly out of note content (hashtag-style) are simple text processing
The parts that'll cause problems
Cross-device sync reintroduces the same conflict-resolution problem every synced notes app on this register faces
A polished, performant graph view of note connections needs real rendering optimization at scale
Full-text search over thousands of notes benefits from a proper search index, not a database LIKE query
How I'd build this
frontend
Astro or a local-first Electron/Tauri app
database
SQLite or plain markdown files on disk
hosting
N/A for a local-first build
MVP scope
A markdown editor with live preview
Notes stored locally with a title and body
Hashtag-style tags parsed from content
A simple list view, searchable by title
Postpone to v2
Cross-device sync
A graph view of note connections
Full-text search over note content
What it actually costs to build
AI agent — with a subscription (Claude Pro/Max, Cursor, etc.)
$0 marginal
AI agent — pay-per-use API, no subscription
$16–$27 one-time
Hosting, once it's running
$0/mo (free tier)
Domain name, if you want your own
~$12/yr
Existing tools solving a similar problem typically run $2.99–$5/mo — see how they compare below.
The build prompt
Genuinely one of the simpler builds on this whole register:
1. A markdown editor with live preview using an existing library (CodeMirror or Tiptap with a markdown mode) — mature, well-documented.
2. Notes stored locally as files on disk or in a local database — no server needed.
3. Hashtag-style tags parsed directly out of note content — simple text processing.
4. A simple list view, searchable by title.
Single device, no sync. That's a real, complete notes app. Out of scope: cross-device sync, which reintroduces the same conflict-resolution problem every synced notes app faces, and a graph view of note connections, which needs real rendering optimization to stay performant at scale.
