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Quick answer: An IQ test measures general reasoning ability with a single composite score. A cognitive test breaks intelligence into specific domains — memory, attention, processing speed, executive function — with a score profile. Use IQ tests for a broad snapshot, cognitive tests for detail.
Core Difference in One Line
IQ tests answer “how does my overall reasoning compare to the population?” Cognitive tests answer “what are my specific mental strengths and weaknesses?”
Side-by-Side Comparison
| Feature | IQ Test | Cognitive Test |
|---|---|---|
| What it measures | General intelligence (g-factor) | Specific cognitive domains |
| Result format | Single score, e.g. 118 | Profile of 4–8 subscores |
| Typical time | 10–30 minutes | 20–60 minutes |
| Best used for | General assessment, Mensa entry | Learning-difference screening, brain injury tracking |
| Examples | Mensa, Eysenck, Wechsler composite | NIH Toolbox, Cambridge CANTAB, Cogstate |
| Clinical use | Rare in practice | Standard in neuropsychology |
When to Take an IQ Test
- You want a single-number summary of your reasoning ability — try the free IQ test.
- You’re considering Mensa membership — use the Mensa IQ test.
- You want to compare against population norms — see the IQ percentile calculator.
When to Take a Cognitive Test
- You suspect a specific weakness (memory, attention, processing speed) needing focused improvement.
- You’re recovering from concussion or stroke and want to track function over time.
- Your child is being screened for a learning difference — school psychologists usually run cognitive batteries, not classic IQ.
Can You Take Both?
Absolutely — they answer different questions. A composite IQ score plus a domain profile gives the fullest picture of your cognitive profile. iqtest.training offers targeted brain training exercises that touch different cognitive domains (logic, memory, attention, speed math) so you can also self-assess informally.
Do Free Online Tests Cover Both?
Most free online “IQ tests” are true IQ tests — they output a single composite. True cognitive batteries usually require a clinician or a research account. Some brain-training platforms (Lumosity, Peak) offer domain-style micro-assessments but those are not clinically validated.