What is Assumption Killer?

Assumption Killer is a structured cognitive tool that helps you test and evaluate untested beliefs and assumptions. Instead of acting on gut feelings, you break down each assumption with evidence for and against, rate your confidence, and get an objective score showing how well-supported your belief actually is.

Yes, 100%. Everything runs entirely in your browser using localStorage. No data is sent to any server. Your assumptions, evidence, and results never leave your device.

How is the result score calculated?

The score is a deterministic calculation based on your confidence level (1-10) and the balance of evidence for vs. against your assumption. More evidence supporting your belief increases the score, while contradicting evidence decreases it. The result ranges from 0-100, categorized as Mostly Assumption (0-39), Weakly Supported (40-69), or Strongly Supported (70-100).

Can I export or share my assumptions?

Your assumption history is stored locally in your browser via localStorage. You can copy results or take screenshots to share. Future updates may include JSON export functionality.

Think Clearly, Decide Better

Kill Your
Assumptions

Stop making decisions based on untested beliefs. Evaluate assumptions with structured evidence, confidence scoring, and actionable test plans — entirely in your browser.

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Structured Testing

Break down assumptions with evidence for and against, confidence scoring, and concrete test actions.

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100% Private

Everything runs locally in your browser. No servers, no uploads, no tracking. Your thoughts stay yours.

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Evidence-Based Scoring

Get a clear result score showing how well-supported your assumption is, from mostly assumption to strongly supported.

Frequently Asked Questions

Everything you need to know about Assumption Killer.

Kill Your Assumptions

Structured Testing

100% Private

Evidence-Based Scoring

Frequently Asked Questions

Kill Your
Assumptions