Wearable Index
Pebble · Ring

Index 01

Shipping

The Pebble Index 01 is a $99 smart ring, shipping since 2026. Minimalist single-button ring with a mic that captures voice memos transcribed privately on your phone — no health tracking.

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Pebble Index 01 — ring worn on the finger
Image sourcePebble

Generations

GenerationYearStatusPriceWeight
Index 01 2026 Shipping $99 4.7 g (size 10)

Specifications by generation

Index 01

2026Shipping

Minimalist single-button ring with a mic that captures voice memos transcribed privately on your phone — no health tracking.

Category
Ring
Worn
Finger
Release
2026
Price
$99
Weight
4.7 g (size 10)
Sensors & hardware
  • Audio Microphone
  • Input Button
  • Connectivity Bluetooth

Developer access

  • Index 01 webhooks / remote MCP public stable
    • Raw audio and/or transcript HTTP POST
    • Optional HMAC-SHA256 signing
    • User-configured HTTP MCP tools
    • Android
    • iOS

    Developer runs the endpoint/server. Remote MCP is called only by the cloud model. Music-button gestures are Android-only.

  • Pebble plugins preview public beta
    • JavaScript .pbw actions and data sources
    • Index assistant tools
    • Pebble mobile app on Android/iOS

    Preview is off by default; API may change. Plugin publication is limited to invited developers; do not publish plugin-dependent apps to the appstore yet.

  • Index ring firmware SDK unavailable

    Official Index documentation explicitly says there is no ring firmware SDK.

Documentation
public
App distribution
available

Phone-side plugin framework in preview; publication limited to invited developers. No general Index on-ring app store is established.

Vendor servers
feature-dependent

Speech recognition and assistant can run locally on the phone or in the cloud. Remote MCP requires Cloud LLM. The July 24 production note still requires Google/Apple/GitHub sign-in; account-free stock-app operation is not established by local inference alone.

Openness

  1. hardwareNot verified
  2. firmwareNot verified
  3. companion appsopen sourceSource
  4. SDKpartial
  5. backend servicesNot verified
Openness, servers & distribution
hardware

Ring schematics and mechanical design files remain unverified; published Pebble watch firmware is not evidence that Index ring firmware is open.

firmware

Source availability and licensing were not established in this review.

companion apps

Official Kotlin Multiplatform Android/iOS app supports Index; developers may contribute or fork. The public mirror is manually synchronized and can lag internal development.

Source · GPL-3.0 (repository LICENSE)
SDK

App-side webhook/MCP interfaces and preview plugins are documented. There is no ring firmware SDK; publishing plugin-dependent apps is currently limited.

backend services

Source availability and licensing were not established in this review.

Direct / local access

On-phone transcription/assistant; recordings transfer by Bluetooth. Webhooks work independently of local/cloud model settings.

Self-hosting

Developer-hosted webhook endpoints and HTTP MCP servers are documented; vendor account/backend replacement is unverified.

Own backend

Configure a webhook for raw audio/transcripts or an HTTP MCP server; remote MCP still uses the cloud model.

Third-party cloud

Google/Apple/GitHub sign-in in the July production note; selected cloud model services when enabled

Distribution notes

Pebble watch apps and their appstore are distinct from Index phone-side extensions.

Company & funding

Pebble · Core Devices

Founder states there are no investors

Company

Current Pebble products are made by Core Devices; do not reuse the original Pebble company financing history.

Not yet verified: disclosed funding, valuation, round count, round history and named investors. A missing record does not imply zero funding.

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Independent index — figures are approximate and editorial, not official spec sheets. Methodology. Last reviewed 2026-10-31.