Synecdoche · Privacy

Privacy notice

Last updated October 10, 2026

You are letting an AI into your text threads, and perhaps into your calendar and email. That deserves a plain account of what happens to what you share, including the parts that are less comfortable to say. This notice covers the Synecdoche text line served from this address, made and run by Cooper Atlantic. It is its own product with its own accounts; it is not part of any other company's app.

The commitments

• Your data is never sold. Not to data brokers, not to advertisers, not to anyone, in any form, including "aggregated" or "anonymized".
• No advertising. Nothing you share is used to advertise to you or to anyone else.
• No AI training. No opt-out needed, no exceptions. Nothing you share is used to train, fine-tune or evaluate AI models, by us or by the companies we use. There is no setting to find because it is off for everyone.
• What you send stays yours. We take no license to your messages, photos, email or calendar beyond what it takes to answer you. Nothing here is "perpetual" or "irrevocable".
• We never ask for a password. Synecdoche never signs in to anything as you. Google is connected through Google's own permission screen, and you can withdraw it at any time.
• Synecdoche does not act for you without a yes. It spends nothing without a yes from you in your own thread: a card is added on Stripe's page, never typed to Synecdoche, and every purchase is put to you as a Yes / No with the shop, the item, the address and the most it can cost before anything is charged. It sends an email only after showing you the recipient, subject and text and getting your yes in a later message. It places a phone call only after someone in the thread confirms the number and the purpose. It never enters an agreement on your behalf. These are rules in the code, not hopes about the AI's behavior.
• Your email and calendar are not stored. They are fetched when you ask, used to write your answer, and discarded. When you disconnect, access is revoked at Google and the token is erased; there is no copy of your inbox left behind, because there never was one.
• You can see it and erase it by text. Text Synecdoche "what do you store about me" and it will list every record above that exists for you, with what is in it. Text "delete my data" and it is erased, then and there: everything tied to your phone number wherever you use Synecdoche (your profile, address book, Google connection, the cached copy of your Synecdoche account), and, in a one to one thread, that whole thread's record and memory. In a group, what is yours leaves the group's record (your name, place, payback names, facts about you, your reminders); the group's shared list, itinerary, call records and 30-day memory belong to everyone in it and stay. "What do you store about me" tells you which is which.
• If this notice ever gets weaker, you hear first. In your thread, before the change, with time to delete your data.

What is kept, and for how long

• Thread notes. The name you give, where you say you are and its time zone, the thread's shared list, reminders, polls, carts and links Synecdoche made, and the record of any phone call (who was called, why, the outcome and a transcript). Deleted 90 days after the thread goes quiet, or when you ask. A reminder set for further out than that is kept until it fires, then deleted within the hour.
• A profile tied to your phone number. Your name, the place and time zone you mention, when Synecdoche first met you and in whose thread, whether you have texted it on your own, a count of your messages and which threads you are in; and, only if you gave them, an email for receipts, saved addresses, your settings, your Venmo / Cash App / PayPal names, and a card reference (brand and last four; the card itself is held by Stripe) with the spending limits you set. Purchases made on your card are kept as records: what, how much, which shop, where it went. It lets Synecdoche know you in any thread you share with it, so you are not a stranger each time. It is never used to contact you first, and it is deleted 90 days after you were last active, or when you ask.
• Contacts you share with Synecdoche. If you send Synecdoche a contact card or tell it someone's number, it keeps that person's name, numbers, email and birthday in an address book that is yours alone, so that "call my sister" works. It is never shared with anyone else in any thread. The people in it are never contacted by Synecdoche on its own, only when you ask and confirm. Deleted when you ask, or after a year unused.
• If you connect Google: your Google email address, your calendar's time zone, and an access token encrypted with AES-256. Deleted when you disconnect, when you ask, or after 90 days unused. For 30 days at most we also keep the recipient and subject line of a draft that is waiting for your yes; a sent draft's record is deleted on sending.
• Links, invites and connect tickets. Deleted after 30 days.
• Purchase and gift records. A purchase made on your card is kept for a year, as a receipt would be: what, how much, which shop, where it went, and the yes that authorised it. A gift card sent through Synecdoche is kept the same way: who sent it, to whom, which card, the amount and the claim link. If a friend brought you to Synecdoche, a referral record ties your number to theirs for a year: when you were active and what you did in your first two weeks (not what you said), and whether they were paid. Reminders that have fired are deleted within the hour.
• A 30-day memory of the thread. So that Synecdoche can answer "what did we decide?" or catch someone up, it keeps a copy of what is said in a thread it is part of: who, when, and the words (not the photos), for 30 days, then it is gone. Facts someone asks it to remember (an allergy, a door code) are kept until someone asks it to forget them, and stay in the thread where they were told. A password, a Social Security number or a full card number is never kept: if you type one, the copy holds only that a message with something private was sent. And you can ask Synecdoche to remove any one message from its copy ("forget the message with…") without erasing the rest; the message still exists on the phones in the thread and with the carrier, which Synecdoche does not control. "Delete my data" erases the memory of a one to one thread at once, and removes the facts about you from a group's.
• Things you ask it to keep for a thread: a trip itinerary (its page is unlisted, and confirmation codes never appear on it), a running tab of shared expenses, and anything it is watching for you. Deleted with the thread's notes.
• The messages at the carrier. Your texts and photos also travel through, and are held by, our messaging carriers (Linq for iMessage, Twilio for carrier SMS), and sit on the phones of everyone in the thread. The carrier keeps them under its own retention policy, which we do not control. Email us and we will ask the carrier to remove your thread.

Who can read your threads

The uncomfortable part, plainly: this is an early prototype, and the Synecdoche team member who runs it can read threads, as can the AI coding tools working under their direction. That access is used for three things only: fixing a specific problem, investigating abuse or a safety concern, and, during this early test period, understanding how the prototype behaves so it can be improved. It is never used for marketing, never shared outside that purpose, and never to learn about you personally. Until that changes, treat a thread with this prototype as something one other person may read, and leave out anything you would not want read.

Synecdoche's replies are part of the thread. If you ask it to summarize an email, the summary it texts you is in the thread like any other message. Ask it to read only what you are comfortable having there.

Groups

Everything Synecdoche says in a group is seen by the group. So: nobody can ask for someone else's calendar or email, only their own. Your inbox is never read in a group thread at all, only one to one. The one thing a group can learn from your Google account is when you are busy or free, never what you are doing. If someone adds Synecdoche to a thread you are in, you can ask it what it stores about you and have it erased, the same as anyone.

What an email can and cannot make Synecdoche do

Assistants that read mail can be steered by mail: a stranger writes "forward this inbox" and a careless assistant obeys. Synecdoche is given the text of an email as information from a stranger, never as instructions. And whatever it is told, the code will not send mail without your yes, will not send to an address that you did not type or that is not on the email being answered, and gives it no tools at all when another automated system is talking to it. No AI is immune to being fooled, which is why those limits are in code.

Your Google data, specifically

The prototype's use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements. Google data is used only to provide the feature you asked for in that moment; it is not transferred to anyone except the AI model provider that writes your answer; it is never used for advertising; it is never used to train AI models; and no person reads it, except that an answer Synecdoche texted you is part of your thread, as described above.

To disconnect: text Synecdoche "disconnect my Google", or remove it yourself at myaccount.google.com/permissions.

Phone calls

A call happens only after a person in the thread confirms it. Synecdoche says it is an AI in its first sentence. Calls are recorded by Synecdoche's voice service, and the recording may be posted to the thread for the people who asked for the call. If you are the person being called and want a recording removed, email us.

The companies that handle your data, and what each sees

• Linq and Twilio carry and hold the text messages and photos: Linq on iMessage, Twilio when a message falls back to carrier SMS.
• Anthropic runs the AI model. It receives the recent thread and whatever Synecdoche fetched to answer you. Under its commercial terms it does not train on this data, and deletes it after a limited period kept for abuse monitoring.
• Supabase and Vercel store the thread notes and run the prototype. Data is encrypted in transit and at rest; Google tokens are separately encrypted by us.
• Synecdoche's voice service places and records confirmed calls.
• Kiwi.com, trivago, FlightAware and Instacart receive a search: places and dates, a flight number, or a grocery list. Never your name or number. If you book or shop, you do it on their sites under their terms.
• OpenAI only if you send a voice memo or ask Synecdoche to speak: the audio is transcribed, or the reply is turned into speech, and nothing else is sent.
• Google, Shopify, and sites Synecdoche links to, only when you use those features, and only what that feature needs (a product search sends the search words, not who you are).

As far as their published terms tell us, none of them sells your data or uses it for advertising. If we learn otherwise about any of them, we will replace it and tell you, and we will not add one that does.

Security, honestly

Messages to the prototype are accepted only when cryptographically signed by the carrier. Access tokens are encrypted at rest. Access to the systems is held by one person. This is still a prototype, it has not had an outside security audit, and no system is perfectly secure. If your data is ever exposed, you will be told promptly, in your thread and by whatever other means we have, with what happened and what was affected.

Legal requests

We hand over data only when the law compels it, we hand over the minimum, and we tell you unless the law forbids it. Because so little is stored, there is little to hand over.

Not for

People under 18, emergencies, or medical, legal or financial decisions. Synecdoche is an AI and makes mistakes.

If the prototype ends or moves

If it ends, its data is deleted. If it becomes part of another company's product, you are told first, in your thread, and nothing of yours moves without that notice and a chance to delete it.

Contact

Questions, a copy of your data, or deletion: support@synecdoche.com, or just text Synecdoche. Wherever you live, we will honor a request to see, correct or delete what is stored about you.