Custos
Privacy Policy
Custos
Privacy Policy
Last updated: September 27, 2026
Custos is a fragrance-collection and wear-tracking application, operated by Custos-Keeper LLC (“Custos,” “we,” “us”). This Privacy Policy explains what information Custos collects, how it is used, where it is stored, when it may be disclosed, and how you can access or delete your information. It applies to the Custos web application and any related website or online service where this policy is posted or linked. Custos is operated from the United States and is currently provided free of charge; we do not currently charge for the app or any features. Your use of Custos is also governed by our Terms of Use.
When you create and use a Custos account, we collect and store the following information:
A wear-log record may also indicate whether you chose a fragrance other than the ones Custos suggested. We use your wear log to provide your history and suggestions. Our team also reviews wear-log records, including those indicators, to evaluate how well the suggestion engine works and to improve future suggestions.
We do not use your wear log for advertising, share it with third-party analytics providers, or use it to track your activity across other apps or websites. Our review of wear-log records for the purposes described above is part of operating and improving the app; it is not third-party analytics or cross-app or cross-website behavioral tracking.
You may choose to add optional profile details: a display name, a home location, an “about me” note, and a weekly routine. These details are optional, and Custos works without them.
“Ask Claude” is an optional feature that uses an Anthropic Console API key you provide. Your key and recent AI-chat history are stored only in your browser on that device, not on Custos’s servers. When you submit a question, your browser sends the question and context directly to Anthropic under your own Anthropic API account. That context includes your “About me” profile text (or “a fragrance enthusiast” if blank); your current local date and time, day of the week, weekday/weekend status, and any special-day flag; the season and any shoulder-season blend; a separate time-of-day category (night, morning, day, or evening) derived from the clock hour; temperature, high temperature, weather category, and weather description derived from your coarse home location (not your raw coordinates); active monthly hold and debut overrides and their notes; and the name, house, tier, stock, seasons, tags, and your note for every bottle in the Core, Extended, Candidate, Archival, Deplete, or Sidelined tier. Wishlist and Gone bottles are not included. Local date and time can disclose your time zone, and free-text fields can contain personal information. These data are sent to generate a response to your question. Custos’s servers do not receive or store Ask Claude requests or responses. You can inspect the current instructions sent with a request using Inspect on the Ask Claude card. Anthropic’s handling of information it receives is subject to the terms and privacy policy applicable to your Anthropic API account. Do not put sensitive personal information in your question, profile, override notes, or bottle notes if you do not want it sent to Anthropic through this feature. You can turn the feature off and erase your key and local chat history in Settings → Ask Claude; you or your browser can also clear local storage.
For each member and day, we store the date, the three fragrances the suggestion engine recommended, and whether the member’s first recorded wear that day matched one of those recommendations. We use this log to evaluate the suggestion engine.
If you report an entry in the shared catalog, we store the reason for the report, any note you provide, and a snapshot of the reported entry, linked to your account. An administrator can review this information to assess and address the report.
Custos does not use advertising, third-party analytics, or behavioral tracking. To operate the app, it uses functional browser storage (for your settings, theme, sign-in session, and the optional items described in 1.5) and a service worker so the app can load offline. Our hosting providers keep standard server logs (such as IP address and request data) to deliver and secure the service. Netlify and Supabase may retain limited IP-address and request logs to operate, secure, troubleshoot, and maintain the Service. We do not use those logs for advertising, behavioral profiling, or cross-app or cross-site tracking.
Custos uses personal information and user content to:
We do not use your information for advertising, and we do not use your collection, wear log, or other content to train artificial-intelligence models.
Custos stores your account information and private app data with Supabase, our database, authentication, and backend hosting provider. The app’s files are served through Netlify, our web-hosting provider. Each user’s personal data is private to that user’s account and enforced at the database level, so other users cannot see your private collection, wear log, or profile. Your information may be stored in the United States or other regions where our providers operate, and our providers maintain routine backups for reliability and disaster recovery.
We do not sell personal information, and we do not share personal information for advertising or cross-context behavioral advertising. We disclose information only as needed to operate the app, including to the following providers:
We may change or add service providers from time to time, but we will use them only as described in this Privacy Policy and will update this Policy where a change is material or required by law.
We may also disclose information: if required by law, subpoena, court order, or legal process; to protect the security, integrity, or operation of Custos; to prevent, investigate, or respond to fraud, abuse, or security incidents; to protect the rights, safety, or property of Custos, users, or others; in connection with a merger, acquisition, financing, reorganization, or sale of assets; or with your consent or at your direction.
Custos includes a shared fragrance catalog that all users draw from. If you submit a fragrance that is not already in the catalog, that fragrance record becomes part of the shared catalog so other users can use it. The catalog is intended to contain information about fragrances, not personal information about users — please do not include personal information in catalog submissions. Catalog entries may remain available to other users even after you delete your account, but they will no longer be linked to your account, and identifying submission details (such as the submitting account) are removed when you delete your account.
Authentication emails, including account-confirmation and password-reset emails, are generated through our authentication service and sent using Resend’s SMTP email-delivery service from send.custos-fragrance.com. Operational notifications (for example, administrator alerts about catalog submissions) are sent through Resend, our email provider. Emails you send to our contact addresses (such as privacy@custos-fragrance.com) are received through ImprovMX, our email-forwarding provider. We send only account-related and service-related emails; we do not send marketing email and do not sell or share your email address. If we ever send marketing emails in the future, we will provide the required unsubscribe options and comply with applicable email-marketing laws.
Custos does not use advertising cookies, third-party analytics, pixels, advertising SDKs, or cross-site tracking. It uses functional browser storage (including a sign-in session token and your saved settings) to operate the app and keep you signed in, and a service worker for offline loading. Our hosting providers keep standard server logs as described in Sections 1.8 and 3. Because Custos does not sell personal information, share it for cross-context behavioral advertising, or use advertising or behavioral tracking, there is no sale, sharing, or tracking to disable in response to a “Do Not Track” or Global Privacy Control signal.
You can use Custos without providing optional profile details (display name, home location, “about me” note, weekly routine) and without enabling the AI feature.
You can review and update your collection, wear log, and profile information within the app.
You can delete your account at any time by going to Settings → Delete my account. When you delete your account, Custos deletes or de-identifies your account and private app data — your collection, wear log, profile, and sign-in information — from active systems, and this cannot be undone. Deletion may not immediately remove information from backups, security logs, or email logs; those copies are retained only for a limited period for backup, security, and operational purposes and are not used for anything else. Fragrance records you contributed to the shared catalog may remain in the catalog but will no longer be associated with your account.
You may contact us with questions or requests about your data at privacy@custos-fragrance.com.
We keep personal information and user content for as long as your account is active and as needed to operate and secure the service, comply with legal obligations, resolve disputes, and enforce applicable terms. When you delete your account, we delete or de-identify your private account data as described in Section 8.3. Backups and logs that may contain residual copies are retained only for a limited period and are then overwritten or deleted in the ordinary course. Shared fragrance catalog entries may remain available to other users but will no longer be associated with your account.
Custos uses reasonable administrative, technical, and organizational measures designed to protect personal information, including encryption in transit (HTTPS), encryption of stored data by our hosting provider, and database row-level access controls that keep each user’s data private to that user’s account. However, no internet service, hosting provider, database, or electronic storage system can be guaranteed to be completely secure.
Custos is a general-audience application that is not directed to children under 13, and we do not knowingly collect personal information from children under 13. If you believe a child under 13 has provided personal information to Custos, please contact us at privacy@custos-fragrance.com, and we will take appropriate steps to delete the information.
Depending on where you live and the applicable state privacy laws, you may have rights to request access to, correction of, or deletion of certain personal information. You can exercise these rights for most data directly in the app, or by contacting us at privacy@custos-fragrance.com. We will respond to privacy requests as required by applicable law and, where feasible, may honor similar requests even where a specific law does not apply. Custos does not sell personal information and does not share personal information for cross-context behavioral advertising.
Custos is operated from the United States as a free, English-language web application and is currently intended primarily for users in the United States. Although the Service may be technically accessible from other locations, we do not currently market, localize, or direct Custos to any specific non-U.S. country or region, and we do not use country-specific domains. If you access Custos from outside the United States, you understand that your information may be processed in the United States and in other locations where our service providers operate.
We may update this Privacy Policy from time to time. If we make changes, we will update the “Last updated” date above. For material changes, we will provide additional notice where appropriate, such as through the app’s in-app notifications or by email.
Questions about this Privacy Policy or your data may be sent to:
Operator: Custos-Keeper LLC, a Georgia limited liability company
Privacy requests: privacy@custos-fragrance.com
Legal notices: legal@custos-fragrance.com
General support: support@custos-fragrance.com (see our Support page)
Mailing address: Custos-Keeper LLC, c/o Wilson Bennett LLC, 555 North Point Center East, 4th Floor, Alpharetta, GA 30022, U.S.A.