In recent years a variety of voice-based notetaking devices have emerged — from credit-card sized gadgets to pendants, pins, and transcribing earbuds — all promising to capture meetings and generate summaries and action items. A new wave of wearables, especially rings, is betting people want to capture stray thoughts and ideas in a similar way.
One company pursuing that bet is Sandbar, the startup behind the private voice ring called Stream. Sandbar has raised $36 million to date, including a $23 million Series A led by Adjacent and Kindred Ventures.
Why Stream is different
On TechCrunch’s Equity podcast, host Rebecca Bellan spoke with Sandbar co‑founder and CEO Mina Fahmi. Fahmi explained why Stream was designed as a push‑to‑talk device rather than an always‑on recorder. He argued that keeping the human firmly in control of when recording occurs is essential, and that social acceptability plays a major role if voice wearables are to move beyond early‑adopter circles into mainstream use.
Fahmi also referenced his experience at CTRL‑labs, the neural interface startup that Meta acquired in 2019. Those experiences shaped his belief in human‑driven input: the device should reflect the user’s intent rather than passively listen.
Building custom hardware
Rather than repurposing off‑the‑shelf components, Sandbar chose to build fully custom hardware — a route Fahmi described as “gruelingly painful.” He said this approach was necessary to meet the company’s goals around privacy, usability, and industrial design.
Implications for the market
Sandbar’s approach aims to give users clear control over when and how voice is captured, combined with a discreet form factor and tailored hardware. Fahmi believes these elements are necessary for voice wearables to broaden their appeal beyond tech enthusiasts and enter everyday use.
The TechCrunch Equity episode covers further details on Stream’s operation, the meaning of social acceptability for wearables, and what it will take for voice devices to reach mainstream audiences.
Key facts
- Company: Sandbar
- Product: Stream (private voice ring)
- Total funding: $36 million
- Series A: $23 million led by Adjacent and Kindred Ventures
- Interview: TechCrunch Equity podcast with Rebecca Bellan; guest Mina Fahmi
- Related background: CTRL‑labs acquired by Meta in 2019 (influenced Fahmi’s thinking)
For more context and direct commentary from Mina Fahmi, listen to the full TechCrunch Equity episode.
