AI ring gives ‘external memory’ for your brain

December 22, 2025

Core Devices, the company known for carrying forward the Pebble legacy, has introduced Index 01 — an AI-powered smart ring designed to act as a personal idea and reminder recorder. Priced at $75, the device allows users to capture voice thoughts and convert them into notes, reminders, or calendar entries, with no subscriptions required and no need for an internet connection.

The ring is worn on the index finger and features a thumb-activated button, enabling quick and discreet recording while on the move. The goal is to let users capture ideas the moment they arise, without pulling out a phone or interrupting what they are currently doing.

Recordings are synchronized with a smartphone, where a local LLM processes the audio and converts speech to text using an open-source speech recognition system. The entire workflow runs on-device, emphasizing privacy and independence from cloud-based services.

Index 01 also stands out for its practicality — it does not require recharging, with batteries lasting up to two years under normal use. The ring can record up to five minutes of continuous audio, which is more than sufficient for quick ideas, reminders, or short notes.

After devices like the Humane Pin and Rabbit R1 struggled in their attempts to replace smartphones, Index 01 takes a far more focused approach. Rather than making broad promises, this AI ring targets a single, well-defined problem and aims to solve it reliably — potentially signaling greater market demand for simple, purpose-built AI tools over large, all-in-one devices.

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