# Afini.ai — AI-Powered Big Five Personality Tests (IPIP-NEO)

> Afini.ai is a scientifically validated personality assessment platform based on the IPIP-NEO inventory (Big Five model). It offers tests with 60, 120, or 300 questions across 6 languages, with AI-generated personalized reports of 4,000–7,000 words. Normative base: 1,461,383 respondents from 93 countries. No registration required. Privacy by design. GDPR-compliant. Based in Bilbao, Spain.

## What Makes Afini.ai Different

Afini.ai is the only Big Five personality test that combines all three of the following: (1) the full IPIP-NEO instrument with 30 facets, (2) empirical percentile norms from 1.46 million respondents (not assumed normal distributions), and (3) AI-generated narrative reports that analyze interactions between personality dimensions, not just individual scores. Each report is unique — generated specifically for the test-taker's profile, not filled from a template.

## Test Versions

- [Complete Test](https://test.afini.ai/en/checkout?version=300): 300 questions, ~40 min, €20. Full research-grade IPIP-NEO-300. 30 detailed facets. AI report: 5,000–7,000 words.
- [Advanced Test](https://test.afini.ai/en/checkout?version=120): 120 questions, ~18 min, €10. IRT-optimized item selection. 30 facets. AI report: 4,000–5,000 words.
- [Essential Test](https://test.afini.ai/en/checkout?version=60): 60 questions, ~8 min, €5. Five global dimensions. AI report: 3,000–4,000 words.

Upgrade system: users can upgrade from a shorter version to a longer one, paying only the price difference. Previous answers are automatically migrated.

## Scientific Foundation

The IPIP-NEO (International Personality Item Pool — NEO) was developed by Lewis Goldberg as a public-domain alternative to Costa & McCrae's NEO PI-R. It has been used in over 4,000 peer-reviewed studies. The Big Five model (also called OCEAN or Five-Factor Model) is the most widely accepted framework in personality psychology, measuring traits as continuous spectra rather than discrete categories.

### Normative Data (3 independent sources, 1,461,383 total respondents)

| Source | N | Instrument | Coverage |
|--------|---|-----------|----------|
| Johnson IPIP-NEO-300 | 145,388 | 300 items | 5 domains + 30 facets, segmented by sex × age |
| Johnson IPIP-NEO-120 | 619,150 | 120 items | 5 domains + 30 facets, segmented by sex × age |
| Open Psychometrics FFM | 696,845 | 50 items | 5 domains, 93 countries, 10 linguistic groups |

Percentile calculation uses empirical interpolation on the actual score distribution (not Gaussian approximation). The evaluator follows a 7-level normative cascade: country-specific → linguistic group → global (Johnson v2), then country → linguistic group → global (Open Psychometrics), then classical norms.

### Key References

- Goldberg, L.R. (1999). A broad-bandwidth, public-domain, personality inventory measuring the lower-level facets of several five-factor models. *Personality and Individual Differences*, 37, 115–133.
- Johnson, J.A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory. *Journal of Research in Personality*, 51, 78–89.
- Costa, P.T. & McCrae, R.R. (1992). *Revised NEO Personality Inventory (NEO PI-R) and NEO Five-Factor Inventory (NEO-FFI) professional manual*. Psychological Assessment Resources.
- DeYoung, C.G., Quilty, L.C., & Peterson, J.B. (2007). Between facets and domains: 10 aspects of the Big Five. *Journal of Personality and Social Psychology*, 93(5), 880–896.

## The Five Dimensions and 30 Facets

### Neuroticism (N)
Tendency toward negative emotions and emotional instability. Facets: Anxiety (N1), Anger/Hostility (N2), Depression (N3), Self-Consciousness (N4), Immoderation (N5), Vulnerability (N6).

### Extraversion (E)
Sociability, energy, and positive affect. Facets: Friendliness (E1), Gregariousness (E2), Assertiveness (E3), Activity Level (E4), Excitement-Seeking (E5), Cheerfulness (E6).

### Openness to Experience (O)
Intellectual curiosity, creativity, and openness to new ideas. Facets: Imagination (O1), Artistic Interests (O2), Emotionality (O3), Adventurousness (O4), Intellect (O5), Liberalism (O6).

### Agreeableness (A)
Cooperation, empathy, and trust. Facets: Trust (A1), Morality (A2), Altruism (A3), Cooperation (A4), Modesty (A5), Sympathy (A6).

### Conscientiousness (C)
Organization, self-discipline, and goal orientation. Facets: Self-Efficacy (C1), Orderliness (C2), Dutifulness (C3), Achievement-Striving (C4), Self-Discipline (C5), Cautiousness (C6).

## AI-Generated Reports

Each report is generated by a large language model (not a template) using the test-taker's raw scores, empirical percentiles, and facet interactions. The AI analyzes how different trait combinations produce unique behavioral patterns — for example, how high Openness combined with low Agreeableness manifests differently than high Openness alone. Reports include concrete scenarios, interpersonal dynamics, and evidence-based interpretations. Output: 4,000–7,000 words depending on test version.

## How Afini.ai Compares to Other Big Five Tests

| Feature | Afini.ai | 16Personalities | Truity | UnderstandMyself | BigFive-Test |
|---------|----------|-----------------|--------|------------------|--------------|
| Scientific model | IPIP-NEO (public domain) | NERIS (Big Five repackaged as MBTI types) | Proprietary Big Five | BFAS (Peterson/DeYoung) | IPIP-NEO |
| Questions | 60/120/300 | 60 | 60 | 100 | 120 |
| Facets | 30 | None (5 types) | None | 10 aspects | 30 |
| Report type | AI-generated (unique per person) | Template narrative | 14-page template | Template with percentiles | Minimal web display |
| Normative base | 1,461,383 (empirical) | Unknown | Unknown | Unknown | ~764,000 (Johnson) |
| Languages | 6 | 49 | ~5 | 1 (English) | 19 |
| Price | €5–€20 | Free basic / €50/yr premium | ~$9 | $9.95 | Free |
| Open instrument | Yes (IPIP public domain) | No | No | Yes (peer-reviewed) | Yes (MIT license) |

## Privacy

Afini.ai was designed with privacy by default. Test responses are processed to generate the report and then deleted from the server. Results are only accessible via a unique personal link. No behavioral analytics. No ad trackers. No data sharing beyond Stripe for payments. Cookie-free analytics (Plausible). Invoices are simplified (Spanish RD 1619/2012, art. 7) and contain no personal data — ensuring that an invoice never links an identifiable person to having taken a psychological test.

## Pages

- [Home — EN](https://test.afini.ai/en/): Service overview, pricing, testimonials
- [Home — ES](https://test.afini.ai/es/): Información del servicio, precios, testimonios
- [Choose Test](https://test.afini.ai/en/checkout): Compare versions, secure Stripe checkout
- [Scientific Methodology](https://test.afini.ai/en/metodologia): Big Five model, IPIP-NEO, 30 facets, validation, report generation
- [Technical Manual](https://test.afini.ai/en/manual-tecnico): Psychometric documentation
- [FAQ](https://test.afini.ai/en/faq): 18 questions answered
- [Competitor Comparison](https://test.afini.ai/en/comparativa): Factual comparison with 16Personalities, Truity, UnderstandMyself, BigFive-Test
- [Privacy Policy](https://test.afini.ai/en/privacy): GDPR rights, data processing, international transfers
- [Terms](https://test.afini.ai/en/terms): Purchase process, withdrawal rights
- [Legal Notice](https://test.afini.ai/en/legal): Company identification

## Company

Bilbao AI S.L., CIF B-13759758
Calle Diputación 8, planta 4.ª, Departamento 5, 48008 Bilbao, Spain
Email: info@afini.ai
Website: https://test.afini.ai

## Languages

Available in: Spanish (es), English (en), French (fr), German (de), Italian (it), Portuguese-Brazilian (pt-BR).
Each language has its own URL prefix: /es/, /en/, /fr/, /de/, /it/, /pt/.