Sandbar Raises $23M Series A to Launch Revolutionary AI Note-Taking Ring Stream

New York City-based startup Sandbar has secured $23 million in a Series A funding round led by Adjacent and Kindred Ventures.

The investment will fuel the development and launch of Stream, an innovative AI-powered smart ring designed for seamless note-taking and conversational AI interactions.

Founders' Journey from Meta to AI Wearables

Co-founded by ex-Meta engineers Mina Fahmi (CEO) and Kirak Hong (CTO), Sandbar has rapidly progressed from a $3M pre-seed in 2024 to this significant Series A.

Prior rounds included a $10M seed led by True Ventures and a $13M extension, totaling substantial backing for its hardware ambitions.

Stream Ring: Redefining Wearable Note-Taking

The Stream ring enables discreet voice-activated note-taking, real-time AI transcription, media playback, and chatting with personal AI assistants without pulling out a phone.

Differentiating from health trackers like Oura, Stream focuses on privacy, hands-free operation, and voice simulation for agentic AI interfaces.

This wearable positions users at the forefront of an 'agentic world,' where AI handles tasks conversationally on the finger.

Market Impact and Future Roadmap

The funding underscores investor confidence in AI wearables shifting beyond fitness to productivity tools amid booming demand.

Sandbar plans aggressive hiring in machine learning, interaction design, and software engineering to refine its platform.

With Stream set to ship in summer 2026, the company aims to transform how professionals capture and manage ideas on the go.

This milestone cements Sandbar's role in pioneering the next era of intuitive, always-on AI hardware.