Privacy Policy

SkinTwin · Last updated 10 July 2026

SkinTwin helps you decide on skincare products by ranking reviews from people whose skin is similar to yours ("skin twins"). This policy explains what we collect, why, and your choices.

What we collect

• Skin profile — the answers you give during onboarding (skin type, primary concern, active ingredient and strength, sensitivity, how long you have used the active, age band, climate). No name or email is required to use the app.
• Account identifier — a random anonymous user ID created on your device to store your profile and preferences. It is not tied to your real identity unless you later add an email.
• Usage events — which review lists and reviews you open and an optional 1–5 usefulness rating, used to improve matching quality. Events are keyed to your anonymous ID only.
• Photos (optional, future feature) — if you choose to add a progress photo, it is stored privately and never shown to other users without your explicit opt-in.

What we do NOT collect

• No name, email, or phone number is required.
• No advertising identifier (IDFA). We do not track you across other apps or websites.
• No location beyond the general "climate" band you select.

How we use it

Your skin profile powers the core feature: ranking reviews by similarity to your skin. Usage events help us measure and improve whether matched reviews are more useful than a generic list. We do not sell your data.

Storage and security

Data is stored on Supabase (PostgreSQL) with row-level security, so your profile, drafts, and events are readable only by your own authenticated session. Photos, if added, are private by default and served via short-lived signed URLs.

Sharing

Aggregated, de-identified review outcomes may inform match quality for other users, but your individual identity is never shared. We use no third-party advertising or analytics SDKs.

Your choices

• Retake the profile quiz at any time to update your data.
• Request deletion of your profile and events by emailing us (below).

Children

SkinTwin is not directed to children under 13. The onboarding age band exists only to improve matching.

Changes

We will update the date above when this policy changes.