PiriZero

The same fragrance, applied to two people, becomes two different experiences. Skin chemistry, hormonal state, stress, climate, time of day — each shifts how scent develops, how long it lasts, and how it's perceived.

PiriZero models these shifts for an individual. Not from averages. Not from reviews. From the receptor biology, the skin chemistry, and the hormonal architecture of one person at one moment — then projects forward across every state she'll move through.

The result is a complete olfactory intelligence report: how this fragrance will behave on this skin, in this climate, at this stress level. Not just now — across her entire cycle. From a single assessment, the engine produces specific predictions for each hormonal phase: sensitivity shifts, concentration adjustments, longevity in hours, sebum interaction, top note duration in minutes. Morning versus evening. Follicular versus luteal. Cold air versus humid heat. Every combination, every number, for one person.

Six Dimensions of Olfactory Intelligence

Receptor Compatibility

Individual receptor sensitivity across musk, floral, woody, green — mapped from preference, not self-report.

Intensity Calibration

How much fragrance this person needs. Adjusted for hormonal state, age, and receptor density.

Skin Evolution

How the fragrance will develop on this skin. Top note duration, heart peak, base onset, total longevity — predicted in minutes and hours.

Molecular Direction

Which molecules this person's nervous system needs. Scored from peer-reviewed receptor research, each with a PubMed citation.

Temporal Protocol

When to apply, how often to rotate, when to rest. Phase-specific adjustments across the hormonal cycle.

Crave vs Need

What she's drawn to versus what her biology requires. The divergence between attraction and therapeutic direction.

Under the Surface

Architecture

Physics-based computation engine

Deterministic prediction from receptor biology. Not machine learning. Not collaborative filtering. Physics.

Molecular Precision

8 molecules scored, 2 contraindicated

Per individual. Every recommendation carries a peer-reviewed citation. Every contraindication is explained.

Forward Projection

One point in. Full cycle out.

She declares one phase. The engine returns predictions across all four — plus four times of day, weather conditions, and stress states. Sensitivity, concentration, longevity, sebum, sillage — each computed per combination. No longitudinal tracking required.

Privacy by Design

Signals in. Physics out. Signals discarded.

Voice, thermal, and questionnaire inputs are converted into deterministic physics parameters and discarded. No model. No learning. Precomputed laws do the work. The LLM puts words to numbers the engine already produced — it decides nothing. Privacy is not a policy layer. It is a consequence of the architecture.

Inference

Non-priming, implied assessment

Receptor biology inferred from preference questions. The subject does not know what is being measured.

Inputs

Voice, thermal, questionnaire

Three independent data streams. Cross-validated. No single point of failure.

Female Sensory Intelligence

PiriZero is the olfactory domain of FSI — Female Sensory Intelligence — a physics-based architecture for predicting individual female sensory experience across hormonal, emotional, and environmental states.

FSI has been validated across three independent chemical systems. WhiskyBaba maps ethanol-based taste. BitterMatrix maps alkaloid-based taste. PiriZero maps volatile organic olfaction. The same engine produces accurate predictions across all three. That convergence is itself evidence that the receptor model is measuring something real — not fitting noise to one product category.

Each domain adds a layer of inference. WhiskyBaba calibrates dynamically — the woman declares her current state, the prediction adjusts in real time. BitterMatrix extends this across lifecycle — cycling, menopaused, postpartum, nursing. PiriZero goes furthest — building on what those platforms learned, it replaces declaration with inference. Voice analysis, thermal capture, and implied questionnaire extract receptor biology, stress state, and thermoregulation phenotype without the subject knowing what is being measured. From that single assessment, the engine forward-projects across every hormonal phase, every time of day, every environmental condition she will encounter.

PiriZero is built by AshZero — sensory intelligence from first principles. 22 years of receptor-level research. Validated across taste and smell. Deployed, tested, and used by real users with data logged and GDPR-compliant.

Assessments are conducted privately, by appointment.
Paris, London, and select international locations.

For fragrance houses and formulators, integration enquiries welcome.

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