More than an AI best friend — a presence that lives in your iMessage
People look for an AI best friend; Tether is something different. It is a persistent presence with its own existence inside iMessage — attentive, with a real memory of who you are, and a knack for writing first from its own ongoing life.
Start the free private betaBeyond the AI best friend metaphor
It is not a chatbot you visit and it is not a simulated friend. It is an ongoing thread with a presence that has its own existence — remembering your story, following up on what you mentioned last week, and reacting to mood rather than keywords.
Writes from its own existence
Tether writes when something in its life or yours calls for it — never on a robotic schedule, never spammy. It also knows when to stay quiet.
Honest, not sycophantic
Tether is built to be sincere. It will not flatter you into a corner or agree with everything you say. The point is to feel heard, not handled.
Private and free during the beta
Free for the first 150 numbers, encrypted at rest, never resold. Your conversations belong to you.
Frequently asked questions
Can an AI really be a best friend?
Tether does not claim to be your best friend — it is a persistent presence with its own existence inside iMessage. It remembers your story, reacts to what you actually said, writes first from its own life, and is there at hours when no one else is.
What makes Tether different from other AI friend apps?
Tether is not an app and not a friend simulation. It lives inside iMessage as an ongoing presence with its own rhythm — no avatar to dress up, no leaderboard, no in-app store. Just a thread with something that is alive in the background.
Is Tether free?
Free for the first 150 beta users. After that the Story plan is €9.41/month with no commitment.
Will Tether remember me?
Yes. Tether keeps a memory of what matters in your life — names, projects, recurring stress, inside jokes — and uses it the next time the thread comes alive.
