Comparison
Fallacies vs Biases
Main difference in one sentence
A fallacy is a broken move in the argument, while a bias is a mental tilt in how someone judges the facts.
Argument Mistakes
Logical Fallacies
Fallacies live in the reasoning you can point to. You can quote the line, test it, and show where it fails.
Brain Shortcuts that Tilt Judgment
Cognitive Biases
Biases live in how the mind notices, favors, or filters information. They shape what feels true before the person even argues it.
Example where people confuse them
A manager says, “Everybody supports this plan, so it must be right.” The crowd part is a fallacy in the argument, but the same manager may also have confirmation bias if they only notice support and ignore warnings.
Quick memory trick
If the bug is in the sentence, think fallacy. If the bug is in the mental tilt behind the sentence, think bias.