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The right SPF for your skin. Right now.

Most people are wearing the wrong sunscreen. AETHR develops yours from what makes your skin different — not what makes it average.

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HOW IT WORKS

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13 Questions
5 Dimensions scored
0-100 Compatibility score

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Not Selected. Engineered.

UV Load

Barrier vulnerability

Therapeutic interference

Spectral vulnerability

Delivery profile

The AETHR Adaptive Engine

Every AETHR formula is the output of a clinical scoring engine — not a category, not a skin type, not a gut feel. It calculates across five dimensions simultaneously, engineering the blueprint around your profile.

The engine doesn't stop at first assessment. As your treatments change, your formula changes. As seasons shift, it shifts with them. Move from London to Lagos — your UV load changes, and so does what your skin needs. This is what adaptive means. Not a promise. A mechanism.

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Your skin profile.Your formula.

What makes your skin different is what shapes your formula.

Your skin profile shapes your formula.

No other skincare brand works this way. Your profile is not stored for later — it is used. Shaped by your skin conditions, your treatments, your environment. Not assumed. Not generic. Yours.

Engine member pricing — locked in permanently.

When AETHR launches, engine members pay the engine member rate, permanently, for as long as you subscribe. That price will never be available again after launch.

Find out how compatible your current SPF is, right now.

Not a generic ingredient scan. A clinical read of what's working against your skin specifically, based on your actual profile. What's in your current SPF that shouldn't be — and why. Exclusive to engine members.

A gift with your first subscription.

Every engine member receives something with their first order. We'll confirm what that is closer to launch.

JOIN THE AETHR ENGINE →

Joining now reserves your place and locks in your benefits. Free. No subscription, no payment, until you choose to start one. When we launch, engine members hear first — at the rate we've held for them.

HOW IT ADAPTS

Your skin changes. Your formula follows.

The seasons shift

In summer your skin is oilier, UV load is higher, and your formula is engineered accordingly. By November, central heating and cold air have changed your barrier. The engine recalculates. The formula changes — not the SPF level, but the formula type. One that now works with your winter skin rather than your summer skin.

A new treatment begins

You start a prescription treatment. Your therapeutic interference dimension increases significantly. The engine applies the clinical logic and develops a formula suited to your new photosensitivity level.

Your skin changes with you

Pregnancy, hormonal shifts, the postnatal period — skin that was oily becomes sensitive. The vulnerability dimension of your profile shifts substantially. The engine identifies this and engineers a new response.

Your environment shifts

Describe what made this milestone important to your journey. Share key events, achievements, or turning points that reflect progress, growth, or transformation.

A prescription changes your photosensitivity

Certain antibiotics, diuretics, mood stabilisers, and HRT significantly increase UV sensitivity — not as part of a skincare routine, but from a GP prescription. The engine treats this as a clinical variable: it adjusts your barrier vulnerability score and develops a formula suited to your changed sensitivity.

Your outdoor exposure shifts

A new job. A baby. A different commute. The difference between four days at a desk and two days outdoors changes your cumulative UV load substantially. The engine recalibrates as your exposure pattern changes — not just when your skin does.

The seasons shift
A new treatment begins
Your skin changes with you
Your environment shifts
A prescription changes your photosensitivity
Your outdoor exposure shifts

ADAPTIVE CIRCADIAN

Day. and night.

SPF protects during the day. At night, a different set of biological signals drives what your skin needs. Your circadian formula is developed from the same profile — engineered around circadian skin biology, for the hours your skin is in repair.

  • 06:00

    UV load begins

    Barrier function at its most resilient

  • 12:00

    UV peak

    Peak photosensitivity exposure window

  • 18:00

    UV declines

    Skin begins transitioning to repair mode

  • 22:00

    Nocturnal repair

    Peak collagen synthesis and barrier restoration

Not all SPF is created equally.

A different approach to photoprotection — and why it matters for your skin specifically.

AETHR
STANDARD SPF
Formula basis
Built around your skin profile
Formulated for broad population use
Clinical dimensions assessed
Five simultaneously
UV protection efficacy
Active treatment consideration
Retinoids, antibiotics, photosensitisers
Outside standard scope
Visible light / HEV
Addressed where clinically indicated
Outside standard scope
Seasonal and environmental adaptation
Formula adapts as your profile changes
Single formulation
Post-procedure skin
Specific recovery-phase logic
Outside standard scope
Evidence application
Applied across every dimension of the formula, for every profile
Applied to efficacy and safety compliance

THE EVIDENCE BASE

Formulated against clinical standards.

Every AETHR formula is developed against the same published clinical and regulatory standards that inform dermatology practice in the UK and Europe. Not consumer opinion. Not trend-led ingredient lists. Not proprietary scoring systems with no published basis.

The evidence base covers UV biology, barrier function, photoprotection in the context of active treatments, pigmentation pathways, and ingredient safety at the concentrations used in daily SPF application. It is updated as the science is.

We don't publish the full framework. But every formulation decision has a clinical rationale, and every clinical rationale has a source.

"Every formulation decision has a clinical rationale. And every clinical rationale has a source."

Things most people don't know about their skin.

UVA passes straight through glass

In 2013, a study documented a truck driver whose left face — the window side of his cab — had aged decades more than the right. Decades of UVA through glass. Your desk, your car, your commute.

Standard SPF only covers half the spectrum

SPF ratings cover UV only. High-energy visible light (HEV) is a separate trigger for pigmentation — particularly in Fitzpatrick III–V skin. Unlike UV, there is no regulated test for HEV protection.

Retinoids change what SPF you need

Retinoid use thins the stratum corneum and increases photosensitivity. A formula that suits non-retinoid skin may be inadequate — or potentially counterproductive — for skin under active retinoid treatment.

80% of visible skin ageing is caused by UV

Not time. Not genetics. UV exposure. The majority of what most people experience as ageing skin — fine lines, texture changes, pigmentation — is the result of accumulated, often unprotected, UV exposure over decades.

Before you begin.

AETHR was founded by two people who spent their careers inside the skincare and formulation industry and saw the same problem in their own home. The team combines clinical formulation depth with a conviction that photoprotection should be reasoned, not marketed.

SPF factor tells you how long a product protects against UVB. It tells you nothing about whether the filters suit reactive skin, whether it works alongside your active treatments, whether it addresses the visible light that drives pigmentation, or whether you'll actually wear it consistently. AETHR engineers around all of that. The factor is the easy part.

Most personalised skincare brands are a product range with a quiz attached. AETHR works differently — a clinical engine calculates across five dimensions, applies hard clinical logic, and builds the formula around your specific profile. The engine is the product. The formulas are what it produces.

The engine is built on clinical decision logic — Fitzpatrick eligibility, treatment photosensitisation, barrier function, visible-light risk. It applies hard clinical gates, and it shows you exactly why each dimension scored as it did. AETHR is developed with clinical input and is undergoing clinical review ahead of launch.

We're careful here: we say what's true today, and we don't claim a clinical endorsement we haven't yet earned.

You'll see your Photoprotection Compatibility Score and the formula developed for your profile — with the full scoring breakdown across all five dimensions. You'll also have the option to see your circadian formula. As an engine member, you can also check how compatible your current SPF is with your profile right now. Your profile is saved and you'll hear from us as we move toward launch.

Nothing. Free to join, no payment, no subscription until you choose one. Joining locks in your engine member rate, a launch gift, and a real role in shaping the formula. When we launch, you decide whether to subscribe.

Your answers are used to calculate your profile and, if you join, to keep you informed and updated as AETHR develops. We don't sell your data. You can ask us to delete it at any time. Read our Privacy Policy.

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