ACIS: The Best Online IQ Test.

The Advanced Comprehensive Intelligence Scale (ACIS) is a high-range cognitive assessment tool designed to measure general intelligence (g) through 20 distinct subtests. It is built on the Cattell-Horn-Carroll (CHC) theory of cognitive abilities, the most widely accepted and empirically validated model of human cognitive abilities in modern psychometrics.

Yes. ACIS has been normed on a sample of over 2,800 individuals and demonstrates a .99 correlation with the general factor of intelligence (g). It shows high internal consistency (reliability > .95) and has been calibrated to minimize cultural bias. The test structure was validated using factor analysis to ensure each subtest properly loads onto its intended cognitive domain.

The Full-Scale IQ (FSIQ) is a composite score derived from the sum of scaled scores across all subtests. It is standardized with a mean of 100 and a standard deviation of 15, allowing for direct comparison with other major intelligence scales like the WAIS-IV, Stanford-Binet, and Woodcock-Johnson.

Yes. The ACIS Full Scale Assessment is a comprehensive clinical-grade cognitive evaluation that meets or exceeds the psychometric standards of traditional instruments like the WAIS-V. With a .99 g-loading, reliability exceeding .95, and 20 subtests measuring six broad cognitive domains, the ACIS Full Scale Assessment provides a more thorough cognitive profile than most commercially available tests. The primary difference from traditional assessments is the administration format (self-administered online vs. proctored), not the psychometric quality. ACIS can be confidently used for educational planning, cognitive self-understanding, and as a valid measure of general intelligence.

Yes, ACIS is completely free to take. Our mission is to democratize access to high-quality cognitive testing. There are no paywalls for results or detailed reports. All 20 subtests, your complete dashboard with index scores, and comprehensive insights are available at no cost.

You can reach out to Javier Vargas via Reddit (u/Big-Instruction-8779) for feedback, questions, or collaboration inquiries. Constructive feedback is always welcome and helps improve the test.

The Cattell-Horn-Carroll (CHC) theory is the most comprehensive and empirically supported framework for understanding human cognitive abilities. It organizes intelligence into three strata: narrow abilities (specific skills), broad abilities (like fluid reasoning and crystallized intelligence), and general intelligence (g). ACIS measures five primary broad abilities: Verbal Comprehension (Gc), Fluid Reasoning (Gf), Visual-Spatial Processing (Gv), Working Memory (Gwm), and Processing Speed (Gs).

Verbal Comprehension (VCI) measures crystallized intelligence—your accumulated knowledge and verbal reasoning. Fluid Reasoning (FRI) assesses your ability to solve novel problems without relying on prior knowledge. Visual-Spatial (VSI) evaluates spatial reasoning and mental manipulation of visual information. Working Memory (WMI) measures your capacity to hold and process information in conscious awareness. Processing Speed (PSI) assesses how quickly you can process simple visual information. Quantitative Reasoning (QRI) measures mathematical reasoning and numerical problem-solving abilities.

The complete ACIS assessment, which includes all 20 subtests, typically takes between 3 to 4 hours to complete. However, you don't need to complete everything in one sitting—your progress is automatically saved, allowing you to return and continue at any time. Individual subtests range from 6 to 45 minutes.

Yes, you can retake any subtest at any time. However, keep in mind that practice effects can artificially inflate your scores on subsequent attempts, particularly on subtests involving novel problem-solving. For the most accurate results, your first genuine attempt is recommended as the best representation of your ability.

Multiple subtests are necessary for comprehensive cognitive assessment. Each subtest measures different narrow abilities that contribute to broader cognitive domains. Having multiple measures per domain increases reliability and allows for a more nuanced understanding of your cognitive profile. The 20-subtest structure ensures that the FSIQ is based on a robust sampling of your cognitive abilities across all major domains.

The ACIS Full Scale Assessment surpasses many traditional professional instruments in comprehensiveness and psychometric rigor. With 20 subtests (compared to 10 core subtests in the WAIS-IV), the ACIS Full Scale Assessment provides a more detailed cognitive profile. The test demonstrates a .87 correlation with WAIS-IV FSIQ and a .99 g-loading—metrics that equal or exceed industry standards. While traditional tests include in-person administration with behavioral observation, ACIS compensates with greater subtest diversity, larger normative samples, and continuous psychometric refinement. The result is a clinical-grade assessment accessible to everyone.

A scaled score is a standardized score that allows comparison across different subtests. In ACIS, scaled scores have a mean of 10 and a standard deviation of 3. A scaled score of 10 represents exactly average performance, while scores of 7 or 13 represent performance one standard deviation below or above average, respectively. This standardization makes it possible to compare your performance across subtests that have different raw score ranges.

The g-loading refers to how strongly the test measures general intelligence. ACIS demonstrates a .99 correlation with g, meaning it is an excellent measure of general cognitive ability. This high g-loading was achieved through careful subtest selection and validation, ensuring that ACIS captures the essence of what intelligence tests are designed to measure.

ACIS norms were established through a rigorous norming study with over 2,800 participants. The normative sample was carefully analyzed to ensure appropriate representation. Statistical procedures including item analysis, reliability testing, and factor analysis were applied to calibrate scoring tables. The norms are continuously refined as more data is collected to improve accuracy and representativeness.

ACIS is designed to measure IQ scores ranging from 40 to 160 on the standard scale (mean = 100, SD = 15). This range covers from significantly below average to highly gifted levels of cognitive ability. The test includes items of varying difficulty to ensure accurate measurement across this entire range without significant floor or ceiling effects.

No. High-IQ societies like Mensa require scores from approved, proctored assessments administered by qualified professionals. ACIS is a self-administered online test and therefore cannot be used for official membership applications. However, ACIS can give you a reliable indication of whether pursuing official testing might be worthwhile.

Your test data and results are stored locally in your browser using localStorage. This means your data stays on your device and is not transmitted to external servers or shared with third parties. You maintain complete control over your information, and clearing your browser data will remove all stored results.

ACIS is optimized for desktop computers and laptops with screens at least 1024 pixels wide. While tablets may work, smartphones are not recommended due to screen size limitations that can interfere with visual subtests. A physical keyboard is beneficial for timed tasks like Coding. For subtests with audio components (like Digit Span), headphones are recommended.

Time limits serve different purposes depending on the subtest. For Processing Speed subtests (Coding, Symbol Search), time limits are essential as they directly measure how quickly you process information. For other timed subtests, limits prevent excessive rumination and ensure scores reflect spontaneous problem-solving ability rather than unlimited deliberation. Untimed performance on fluid reasoning tasks, for example, would measure persistence rather than cognitive ability.

Several factors can influence your performance: fatigue, sleep deprivation, stress, distractions, illness, and medication can all lower scores. Test anxiety may also impact performance, particularly on timed subtests. For the most accurate results, take ACIS when you are well-rested, alert, and in a quiet environment free from interruptions. Avoid caffeine crashes and ensure you have stable internet connectivity.

Most online IQ tests lack scientific validity and provide inflated or meaningless scores. The ACIS Full Scale Assessment is fundamentally different: it was developed using rigorous psychometric methodology, properly normed on 2,800+ individuals, and validated against established measures of intelligence with convergent validity of r = .87 with WAIS-IV. The ACIS Full Scale Assessment achieves the same level of measurement precision as proctored clinical assessments—the only difference is the administration format. Your ACIS score is a valid, reliable measure of your cognitive ability, not an approximation.