— Comparison
Core Brain vs 123test.com
— Don't just read about it
Find out YOUR exact IQ
20-min calibrated test · real psychometrics
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123test offers a free quick IQ test and a paid Pro version. Different approach, different audience.
| 123test.com | Core Brain | |
|---|---|---|
| Format | Free 22-min classical IQ test (verbal, spatial, numeric subtests), paid version costs $29.95 for detailed report | Free 20-min test, $15 one-time unlock for full normed report with six-axis breakdown |
| Methodology | Classical test theory (CTT) | IRT 3PL Bayesian MAP |
| Confidence interval | No | Yes (95% CI) |
| Six-axis breakdown | No | Yes |
| Time | 15-30 min | 20 min |
| Cost | $29.95 | $15 |
— Try one before you read on
Continue the pattern: A, C, F, J, O, ?
Gaps grow by 1 each time: +2, +3, +4, +5, +6. O+6 = U.
That was 1 question. Take the full 20-min test →
Verdict
→Pause. Find out YOUR IQ before you keep reading.123test is well-established but uses classical scoring rather than item response theory. Core Brain uses modern IRT psychometrics (same as the WAIS), which produces more accurate estimates from fewer items.
Try Core Brain
20 minutes, six cognitive axes, full normed IQ with 95% confidence interval. $15 unlock or take a promo code if you have one.
Which should you take?
→Curious how YOU score? 20-min calibrated test.Take 123test.com if:
- You prefer classical (older) test methodology
- You want a longer, more comprehensive single test
Take Core Brain if:
- You want a calibrated 20-minute test with real IRT scoring
- You want to see WHICH cognitive axis you're strongest in, not just a single number
- You want a 95% confidence interval on your score (the mark of a real psychometric test)
- You want a downloadable certificate