CounterExample

CounterExample is a focused reasoning app for practicing one powerful logic skill: disproving broad claims with a single valid counterexample. Each session guides you through a strict falsification workflow, from reading a claim and finding absolute language to writing one concrete exception that breaks the claim as stated.


The app helps you inspect universal words such as all, always, never, only, must, and impossible. You lock the claim scope, test whether one real exception is enough, map why the case belongs inside the original scope, and explain how it contradicts the claim. After the disproof, you repair the original statement into a narrower and more defensible version.


Completed sessions become Counter Cards that preserve the reasoning chain: claim, exception, disproof, and repair. The app is designed for learners, writers, students, teachers, and critical thinkers who want structured practice with careful claims, clear exceptions, and better reasoning habits.