Cards, lists, and drag-and-drop reordering is genuinely one of the more approachable builds here — existing kanban libraries handle the fiddly reordering math, leaving a straightforward schema and CRUD API underneath.
Build it
Effort: a weekendRunning cost: $0/mo to start
Why CanICodeThis says Build it
Drag-and-drop kanban libraries (dnd-kit or react-beautiful-dnd) handle the fiddly reordering math — the UI wires in in a day
Cards, lists, labels, and due dates are one schema, one CRUD API
For a small team, real-time sync isn't even required to start — refresh-on-focus is often good enough
The parts that'll cause problems
Automation rules ('when a card enters this list, notify someone') are a small workflow engine, not a weekend add-on
Real-time sync so two people see the same board update instantly is doable but adds real complexity beyond solo or async use
A plugin ecosystem for third-party integrations represents years of accumulated product investment
How I'd build this
frontend
React with dnd-kit
database
Supabase
hosting
Vercel
MVP scope
Boards with lists and cards
Drag-and-drop reordering within and between lists
Labels and due dates on cards
Postpone to v2
Automation rules on card movement
Real-time sync across simultaneous viewers
Third-party integrations
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
$43–$86 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 $5–$10/mo — see how they compare below.
The build prompt
Genuinely one of the more approachable builds here:
1. Boards containing lists containing cards — a clean, well-bounded schema.
2. Drag-and-drop reordering both within and between lists using an existing kanban library (dnd-kit handles the fiddly reordering math).
3. Cards have a title, description, labels, and a due date.
Simple login for a small team is enough. That's a real, complete kanban board. Out of scope: automation rules ('when a card enters this list, notify someone'), a small workflow engine, not a weekend add-on, and real-time multi-user sync so two people see the same board update instantly, doable but adding real complexity beyond solo or async use.
