Free Brainstorming Tool — No Signup Required

Idea Dump is a free online brainstorming tool that lets you capture ideas and immediately challenge them. For each idea, write down why it won't work and what's good about it. This structured friction unlocks creative flow and helps you think more honestly about your ideas.

How to use Idea Dump

Write any idea in the left column — no filter, no judgment
List reasons why it won't work in the right column
Click "what's good?" to capture the upsides
Drag cards to reorder your ideas
Open Summary to see all your ideas as a table, bubbles, outline, or list

Who is this for?

Entrepreneurs validating startup ideas, product managers doing pre-mortems, writers overcoming creative blocks, students brainstorming essays, or anyone who wants to think more clearly about decisions. Works great for pros and cons analysis, idea validation, and structured brainstorming sessions.

Features

Multiple reasons why an idea won't work, per idea
Pros and cons capture side by side
Auto-saves to your browser — no account needed
Drag and drop reordering
Summary view: table, bubble map, outline, and ideas-only formats
Keyboard shortcuts: Enter adds a new point, Backspace on empty removes it