Last updated: June 2nd 2026
Ariadne is a health companion you talk to. For it to be useful, you share things about your body, your health, and sometimes your life. We take that seriously, and we'd rather tell you honestly how this works than hide it behind legal language. So here is the short, human version — the detailed sections follow underneath.
You're in control of what you share. You don't have to tell Ariadne anything in particular. It only ever knows what you choose to tell it. The more context you give, the more useful it can be — but that's your choice, always.
What we hold: the messages between you and Ariadne, a profile Ariadne builds from your conversations so it can remember your history, and the basic details to run your account (your email, your first name).
Who reads your conversations: we have built Ariadne so that no part of how it works involves a person reading your conversations. We don't read them as a matter of practice, and we never will — except in the narrow case where you explicitly ask us to, so we can fix a problem you've told us about. When we want to improve Ariadne, software does that analysis and gives us patterns, never your actual words. We hold ourselves and anyone who ever works on Ariadne to this commitment.
Who we share it with: only the companies whose technology makes Ariadne work — the AI that powers the conversation, the service that turns your voice into text if you speak, and the infrastructure that stores and runs everything. They process your words only to do their job. We have set our accounts so your conversations are not used to train anyone's AI. We do not sell your information. We do not show adverts and never will. That's not the kind of product this is.
Your control: you can ask to see everything we hold about you, and you can delete your account and data entirely, at any time, by emailing us.
If you speak to Ariadne: your voice recording is sent to a transcription service to turn it into text, then the text is what Ariadne works with. If that gives you pause, you can always type instead — it works exactly the same.
One important thing: Ariadne is a companion for movement and wellbeing. It is not a medical service and not an emergency or crisis service. If you are ever in crisis or danger, please contact your local emergency services or a crisis helpline directly — we say more about this below.
If you read the above and don't feel at ease, tell us — and honestly, if enough people don't feel at ease, that's a sign we need to build this differently, not word it differently. The rest of this policy is the detailed version of everything just said.
Ariadne ("Ariadne", "we", "us") is operated by Fifty Three & Co LLC d/b/a MeetAriadne, the data controller responsible for your personal information.
If you are in the UK or EU, you have the right to lodge a complaint with your local data protection authority, though we'd ask you to contact us first so we can try to put things right.
Ariadne is intended for adults aged 18 and over. We do not knowingly collect personal information from anyone under 18. If you believe a minor has provided us with information, contact us and we will delete it.
Information you choose to give us:
You are never required to share health information to use Ariadne. It works with whatever you choose to tell it.
Information collected automatically:
We practise data minimisation: we collect what Ariadne needs to work and to remember you, and not more.
| What we use it for | Lawful basis (GDPR Art. 6, and Art. 9 for health data) | |---|---| | Providing the Ariadne service and conversation | Performance of a contract with you | | Processing health-related information you choose to share | Your explicit consent (Art. 9(2)(a)) | | Building and maintaining your health profile so Ariadne remembers you | Performance of a contract; explicit consent for the health elements | | Improving Ariadne (via automated, aggregate analysis only — never human review of your content) | Our legitimate interest in improving the service, balanced against your rights | | Account security, fraud prevention, keeping the service running | Legitimate interest / legal obligation | | Responding to your messages and rights requests | Legal obligation / legitimate interest |
You may withdraw your consent at any time by deleting your account; this does not affect processing already carried out.
Much of what you share relates to your health. Under GDPR this is "special category data" and under California law "sensitive personal information". We process it only on the basis of your explicit consent and use it only to provide Ariadne to you. We do not use it for advertising, we do not sell it, and we do not share it beyond the technical processing described in Section 6.
Ariadne is a wellbeing and movement companion, not a medical service and not an emergency or crisis service. It does not diagnose or treat, and nothing it says is a substitute for professional medical advice or emergency care.
If you are in crisis or at risk: Ariadne is not an emergency service and we do not monitor conversations in real time. If you are ever in danger, thinking about harming yourself, or in a medical emergency, please contact your local emergency services or a crisis helpline directly. Ariadne will always encourage you to do so and will try to point you toward appropriate support.
Disclosure to prevent serious harm: we will not share your information except as described in this policy — but if we become genuinely aware of a credible risk of serious harm to you or someone else, we may disclose information where we believe in good faith it is necessary to help prevent that harm.
We do not sell your personal information, and we never share it for advertising. We share it only with the service providers whose technology Ariadne is built on, and only so they can perform their function:
Each of these acts as our data processor under a data processing agreement. We choose providers whose terms are compatible with GDPR and CCPA.
We may also disclose information if required by law, or as described in Section 5 to help prevent serious harm.
Some of our providers are based in, or process data in, the United States. Where your data is transferred outside the UK/EU, we rely on appropriate safeguards (such as Standard Contractual Clauses or equivalent mechanisms in our providers' data processing agreements) to protect it.
We keep your account information and conversation history for as long as necessary to provide the service to you — Ariadne's usefulness depends on remembering your history over time. We do not keep your data longer than we need it. If you delete your account, we delete your personal data from our systems and request deletion from our processors, except where we are legally required to retain something.
Voice recordings are not stored by us beyond what is needed to obtain the transcript; our transcription provider does not retain audio or transcripts after processing.
We use industry-standard measures including encryption in transit, access controls, secure managed infrastructure, and a deliberate commitment not to build any process that involves a person reading your conversation content. Improvement analysis is performed by automated systems that return aggregate patterns, not your individual words. Anyone who works on Ariadne is bound by the same commitment. No system is perfectly secure, but we design to minimise what is held, who can reach it, and for how long.
If you are in the UK or EU (GDPR), you have the right to:
If you are a California resident (CCPA/CPRA), you have the right to:
How to exercise your rights, and how quickly we respond: email us at privacy@meetariadne.co. We will respond within the legally required timeframe — up to one month (30 days) under GDPR, extendable for genuinely complex requests — but we aim to do it much faster than that. You can delete your account and data at any time by emailing us; we will build a self-service route into the app, and we will always honour a request made by email.
If we change how we handle your information — for example, if we change a service provider — we will update this policy and, for material changes, let you know directly.
Questions, requests, or concerns: privacy@meetariadne.co.