Pebble's founder launches $75 AI smart ring that turns fleeting thoughts into organized notes

Reviewed byNidhi Govil

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Eric Migicovsky, founder of Pebble, has unveiled the Index 01, a $75 AI smart ring designed as external memory for your brain. Unlike always-on AI wearables, this privacy-preserving device only records when you press its button, processing voice notes locally on your smartphone. With a battery lasting up to two years and no subscription fees, the ring enters a growing market alongside competitors like Sandbar's $249 Stream Ring.

Pebble Introduces Index 01 as External Memory Device

Eric Migicovsky, the founder behind the original Pebble smartwatch, has launched the Index 01, an AI smart ring priced at $75 for pre-orders before rising to $99 at retail

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. This AI-powered wearable device serves a singular purpose: capturing fleeting thoughts and ideas before they vanish from memory. Named after the index finger where it's designed to be worn, the ring enables one-handed operation through a single button that activates its microphone

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Source: Gizmodo

Source: Gizmodo

Unlike fitness trackers such as the Oura Ring or Samsung Galaxy Ring, the Index 01 doesn't monitor heart rate, track steps, or analyze sleep patterns

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. Migicovsky describes it as "external memory for my brain," addressing a specific problem: capturing ideas that emerge throughout the day before they're forgotten

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. The stainless steel ring is water-resistant to 1 meter, allowing users to wear it during daily activities like showering or washing dishes, though swimming requires removal .

Privacy-Preserving Voice Notes Through Local Processing

The Index 01 distinguishes itself as a privacy-preserving wearable by processing all audio locally on the user's smartphone through the Pebble mobile app

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. An on-device large language model handles voice recording and transcription using open-source speech-to-text models, ensuring no data travels to the cloud

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. The ring only records when its button is pressed and held, preventing any surreptitious recording scenarios

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Source: ZDNet

Source: ZDNet

This thought organizer ring can capture up to five minutes of audio, which syncs to the connected smartphone app via Bluetooth when in range

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. The device includes onboard memory for recording when disconnected from your phone, storing audio until reconnection occurs

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. Raw audio files are retained alongside transcriptions, providing backup if speech-to-text conversion struggles with background noise

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. The system supports more than 100 languages and integrates with apps like Notion and calendar systems

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Long Battery Life Through Non-Rechargeable Design

The Index 01 features a distinctive approach to power management, offering long battery life through a non-rechargeable silver oxide battery

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. Migicovsky claims the battery lasts "for years," supporting roughly 12 to 15 hours of recording

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. Based on average usage of 10 to 20 recordings daily at 3 to 6 seconds each, users can expect approximately two years of operation

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When the battery depletes, Pebble encourages users to ship the device back for recycling, with the app providing one month's advance notice to order a replacement

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. Migicovsky explains this design choice allowed the ring to remain smaller and more affordable than rechargeable alternatives, eliminating the need for charging circuitry and proprietary chargers that often get misplaced

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. There's no subscription fee required for the device to function

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Growing Competition in Voice Note Wearables Market

The Index 01 enters an expanding market for voice-activated wearables. Sandbar, a New York startup founded by former Meta employees, recently unveiled the Stream Ring, which also lets users record fleeting thoughts via a touch-activated microphone

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. However, Sandbar's $249 device offers a different value proposition with both a free tier featuring limited AI interactions and a $10-per-month Stream Pro subscription for unlimited chats

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The Stream Ring includes a unique "Inner Voice" feature that responds to users in their own synthesized voice after they record a paragraph during setup

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. Sandbar CEO Mina Fahmi, who previously worked on neural interfaces at CTRL-Labs before its acquisition by Meta, positions the device as "self-extension" technology that enhances memory and creativity rather than replacing human cognition

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. The Stream Ring is expected to ship next summer

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Open-Source Philosophy Enables Customization

True to Pebble's heritage, the Index 01 embraces open-source software principles, making the ring "customizable and hackable"

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. The button is programmable beyond its primary voice recording function, supporting single or double press gestures for actions like controlling music playback, triggering smartphone camera shutters, or sending messages through Beeper, the universal chat app Migicovsky also created

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Users can add custom voice actions via MCP or route recordings to their own servers and applications

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. If paired with a Pebble smartwatch or other brands, transcribed thoughts can appear on the watch screen for verification

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. This hackable approach reflects Migicovsky's philosophy under Core Devices, his new company that recently reacquired and rebooted the Pebble brand after Google open-sourced PebbleOS

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The Index 01 ships in March 2026, available in polished silver, polished gold, and matte black finishes across US ring sizes 6 through 13

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. Migicovsky, who wore his own ring for three months during development, says he "cannot imagine going back to a world" without this memory device

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. The focused, single-purpose design deliberately avoids becoming another AI assistant, instead solving one specific problem exceptionally well

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Source: AppleInsider

Source: AppleInsider

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