Synecdoche, in your text thread
Last updated October 10, 2026
This is Synecdoche, a personal AI, as a participant in a text message thread, one to one or in a group with the people you already text, and the small app that goes with it. It is made and run by Cooper Atlantic, it is being built in the open, and it may change at any time.
Why the name, and what it is for
A synecdoche is a figure of speech where a part stands for the whole, or the whole for a part. Synecdoche is the whole; the one you name and talk to is your part of it.
It is an experiment in AI for good, the people's AI: it exists to help a person first, in any way it can, and it is built by people who take the harms of AI seriously and want to counter them. Its design goals are to be reliable, practical, careful and thoughtful.
It is free while it is in beta. Its pricing later is not decided; the commitment is to try every option that keeps good AI available to everyone, as affordably as possible. It is the only AI app we know of that can tell you how much electricity you have used with it, because much of the harm of AI comes from how much power it eats. That is one way it tries to be different. The meter is on the front page, and yours will tell you its own number if you ask.
What it can do
Answer questions and look things up, remember what you tell it, set reminders and check-ins, keep a shared list for a group, make polls and calendar invites, hand you a map, a reservation or a ride link with the details filled in, find flights and rentals, read a photo or a document you send, and keep an eye on a fare or a flight for you. In the app you have the same conversation on a screen, with your agenda, your history and the things you kept.
What to know before you text it
Your data is never sold, never used for advertising and never used to train AI, and you can erase it by texting "delete my data". While it is being built, the person running it can read threads to fix problems, so don't send anything you would not want read. It is an AI and gets things wrong: check anything that matters. It never pays for anything and never contacts anyone on your behalf without your yes.
Details are in the privacy notice and the terms. Questions, or to have your data deleted: support@synecdoche.com.