Comparison
Lychnos Ring vs Sandbar Stream.
Both rings are for your voice, and both keep the microphone off until you press. The difference is where the answer comes back, and whether the ring needs your phone.
In short. Sandbar Stream is a voice ring that works with its iPhone app and answers through your earbuds, or with a notification and a buzz. Lychnos Ring is designed to work without the phone after set-up, with answers on its own screen and speaker. Neither ships yet.
Side by side
| Lychnos Ring | Sandbar Stream | |
|---|---|---|
| Status | In development; free list open | Pre-order; shipping in the US first; iOS |
| Price | Expected €299 | $249 or $299 |
| Plan | €9.99 a month for the first buyers; later expected €14.99 to €19.99 | Three months included with a pre-order, then $10 a month; notes, music control and some dictation stay free |
| Microphone | On only while you hold the button | On only while you press the touchpad |
| Where answers come back | On the ring’s screen, and at your ear from its speaker | By audio through earbuds or a speaker; otherwise a notification and a buzz |
| Connection | Own eSIM (design); the phone only for set-up | Through its iPhone app |
Sources, checked 3 November 2026: Sandbar’s FAQ; the ring’s price from The Gadgeteer. Lychnos Ring’s figures are design targets. Prices and features change.
Where they agree
Both treat the microphone as something you switch on with your finger, not something that listens all day. That matters for a device you wear among other people. Both also answer without a screen in your hand: Stream with a buzz or in your earbuds, Lychnos Ring with a buzz, a line on the ring and its own speaker.
Where they differ
Sandbar Stream is built around capturing your thoughts and talking with an AI through the phone you already carry. Lychnos Ring is built to close the loop on the ring itself: you ask, the ring answers, and one press approves what it proposes, over its own mobile connection. That costs battery and needs a plan for the data; it also means you can leave the phone behind for the small things.
See every voice ring we track in AI rings, compared.