Stream smart ring brings subtle, whisper-level AI control to your finger

A growing wave of voice-enabled devices from pendants to wristbands has been designed to blend artificial intelligence with everyday life. Now, a new contender has entered the space: Sandbar, a startup founded by two former Meta employees, has introduced Stream, a smart ring that acts as “a mouse for voice.”

The ring allows users to take notes, control music, and interact with an AI assistant through subtle gestures and voice input.

Stream, designed to be worn on the index finger of the dominant hand, features microphones and a touchpad. The microphone remains off by default and activates only when the user presses and holds the touchpad. In a virtual demo, Sandbar CEO Mina Fahmi demonstrated how the device could accurately transcribe even whispered thoughts into its companion iOS app.

The app includes an AI chatbot capable of organizing notes and engaging in two-way conversation as users record ideas. Notes can later be reviewed in a timeline-like interface, with a pinch-to-zoom gesture enabling a broader view of prior entries. To enhance the experience, the assistant’s voice has been personalized to sound somewhat like the user’s.

According to Fahmi, the inspiration for Stream came from the limitations he experienced when building an early journaling app. “A lot of my ideas bubble up when I’m walking or commuting, and I don’t want to pull out my phone or talk into my earbuds,” Fahmi told TechCrunch . “We wanted to find a way to capture thoughts the moment they appear and that’s how Stream was conceived.”

When used in noisy environments, users can pair headphones for privacy. Without them, the ring offers haptic feedback to confirm note-taking or task updates allowing to-dos to be added or checked off discreetly. Beyond voice features, Stream’s flat surface doubles as a media controller for play, pause, volume, and track-skipping, a convenience aimed at users on the move.

Pre-orders for Stream open Wednesday at $249 (silver) and $299 (gold), with shipments expected next summer. A Pro subscription tier free for the first three months will offer unlimited chats and early feature access for $10 per month thereafter.

Sandbar emphasized that user data will remain encrypted at rest and in transit, with full export capabilities to third-party apps like Notion. “We don’t believe in walled gardens,” Fahmi said, underscoring the company’s commitment to openness and user control.

Founded by Fahmi and Kirak Hong, who met while working at CTRL-Labs (later acquired by Meta), Sandbar draws on deep expertise in human-computer interaction. Fahmi previously contributed to brain-interface startup Kernel and augmented reality firm Magic Leap, while Hong has held positions at Google and Meta.

The company has raised $13 million in funding from True Ventures, Upfront Ventures, and Betaworks. Toni Schneider, a partner at True Ventures, said his team was initially skeptical of AI hardware but was impressed by Stream’s concept and execution. “Many people agree that voice and AI go hand in hand, but using a phone or laptop just to talk to AI feels excessive,” Schneider said. “When Mina showed us the demo, it finally made sense.”

The AI hardware race remains highly competitive. Players such as Plaud, Pocket, Friend, Limitless, and Taya have launched similar products in pendant or card form, while Bee’s wristband was acquired by Amazon. However, mainstream adoption has proven difficult. Startups like Humane have been sold off, and others such as Rabbit and Friend continue to refine their offerings to capture user interest.

Fahmi noted that Sandbar’s goal is not to create another digital assistant but to build a natural, unobtrusive interface for human expression. Whether the ring form factor can succeed where others have struggled remains to be seen but Stream could signal a new chapter in the search for seamless voice-AI interaction.