AI-powered logical analysis for your text

Identify logical fallacies and reasoning errors in your writing with AI-powered analysis. An experimental tool for improving critical thinking and argumentation.

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See LogicLens in Action

Test LogicLens accuracy with our validation suite. These examples demonstrate the system's ability to identify logical fallacies and validate sound reasoning.

Logical Fallacy Tests

These examples contain logical errors that LogicLens should identify

Multiple Fallacies

Ad HominemNon SequiturHasty Generalization

Senator Johnson's healthcare proposal is completely wrong because he was caught speeding last year. Anyone who can't follow traffic laws clearly can't be trusted to make decisions about healthcare policy. We should reject his entire healthcare plan based on his poor driving record.

Expected Analysis: Should identify: 1) Ad Hominem Fallacy - attacking person rather than proposal merits, 2) Non Sequitur - traffic violations don't logically connect to healthcare policy competence, 3) Hasty Generalization - single incident used to judge overall trustworthiness

False Dichotomy

False DilemmaBlack-and-White Thinking

We must choose between complete economic freedom or total government control. There are only two options: either we eliminate all business regulations and let the free market decide everything, or we have the government control every aspect of the economy. Any middle ground is impossible and unrealistic.

Circular Reasoning

Begging the QuestionCircular Logic

Our new product is the best on the market because it's superior to all competitors. We know it's superior because our market research shows it's the best available option. The research is reliable because it was conducted on the best product in the market.

Appeal to False Authority

Appeal to AuthorityIrrelevant Expertise

Climate change isn't real because my uncle Bob, who works at a gas station, says it's all made up by scientists who want research funding. Bob has been working with cars for 30 years, so he knows more about atmospheric science than those so-called climate experts with their fancy degrees.

Straw Man Argument

Straw ManMisrepresentation

Environmentalists want to ban all cars and force everyone to walk everywhere, even in emergencies. They think people should never use any technology and want us all to live in caves. This extreme position shows why we shouldn't listen to any environmental concerns about transportation.

Sound Reasoning Tests

These examples use valid logic that should pass without errors

Valid Deductive Reasoning

Syllogistic LogicPremise-Conclusion

All software applications require regular security updates to protect against newly discovered vulnerabilities. Our company's customer management system is a software application. Therefore, our customer management system requires regular security updates to maintain protection against vulnerabilities.

Evidence-Based Argument

Data-DrivenLogical Inference

Based on our quarterly sales data showing a 15% increase in mobile purchases and user analytics indicating 68% of our traffic now comes from mobile devices, we should prioritize mobile optimization for our e-commerce platform. This investment aligns with demonstrated user behavior patterns and revenue trends.

Balanced Risk Assessment

Cost-Benefit AnalysisRisk Mitigation

While implementing AI automation could reduce operational costs by an estimated 20%, we must also consider potential risks including job displacement, initial implementation costs, and the need for employee retraining. A phased approach would allow us to measure benefits while mitigating risks through gradual transition and workforce development programs.

Problem-Solution Logic

Causal AnalysisTargeted Solution

Our customer support response time has increased to an average of 48 hours, leading to decreased customer satisfaction scores. Analysis shows this is due to a 40% increase in support tickets without corresponding staff increases. We propose hiring two additional support specialists and implementing a ticket prioritization system to reduce response times to our target of 24 hours.

Valid Conditional Logic

If-Then ReasoningModus Ponens

If our website's loading speed exceeds 3 seconds, we will lose potential customers according to industry research. Our current loading speed is 4.2 seconds. Therefore, we are likely losing potential customers due to slow loading times. Optimizing our website's performance should improve customer retention and conversion rates.

Validation Success Criteria

Fallacy Tests: Should identify specific logical errors with explanations
Sound Logic Tests: Should find no significant logical errors
Target Accuracy: 90%+ correct identification rate
Analysis Quality: Detailed explanations with specific reasoning

About This Prototype

An experimental AI tool for identifying logical errors and improving reasoning

AI-Powered Analysis

Uses Google's Gemini AI to identify logical fallacies and reasoning errors

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