Sentinel 2026 (Legacy Bridge Edition)

v2.6 - (4/13/26) - Fix for edge-cases where the graph normalization might not execute due to a messaging issue. Now graph normalization is calculated on device instead of on the phone.

v2.5 - (3/24/26) - Low alert function bug for mmol users has been fixed.

v2.4 - To address some of the feedback from end-users, we are experimenting with rolling back the node version from 16 to 14. It was indicated that node 16 would work, but the version that many state was stable / better was compiled with node 14.

Sentinel is a high-performance CGM data monitor for the Fitbit ecosystem, now maintained as a Legacy Support Project by Sentronica LLC. This version serves as a stable final release, bridging our long-term users into the modern Sentronica ecosystem.

Key Technical Status

Platform Maturity: This software is built on the 2023 terminal version of the Fitbit SDK toolchain.

Sentronica Integration: This build requires a Sentronica account for membership verification, aligning your legacy device with our modern web and Wear OS infrastructure.

Core Features

Multi-Account Monitoring: Track up to 3 individual CGM profiles (Nightscout, Dexcom Share, or xDrip+).

Smart Alarms: Independent high/low and delta alarms with custom snooze intervals.

Requirements

A valid Sentronica membership for authentication. Visit https://sentronica.com for more information.

Acceptance of the Legacy System Disclaimer at the top of the watchface settings once installed.

Visit Sentronica.com and register today!