Strimma¶

Open-source Android CGM companion app for people with diabetes.

Strimma displays your glucose with a real-time graph, alerts you when you're going low or high, and pushes your data to Nightscout. It receives glucose from your existing CGM app, from xDrip-compatible broadcasts, or by following a remote Nightscout server.

Strimma stands on the shoulders of the incredible xDrip+ project and the broader DIY diabetes community that proved open-source CGM tools save lives. It uses the same broadcast format, the same Nightscout protocol, and shares the same philosophy: your data, your choice.

What Strimma Does¶

• Receives glucose four ways — reads notifications from 50+ CGM app variants (Dexcom, Libre, CamAPS FX, etc.), receives xDrip-compatible broadcasts (from xDrip+, Juggluco, AAPS), follows a remote Nightscout server, or reads from Abbott's LibreLinkUp cloud. See Data Sources.
• Shows your BG at a glance — large, color-coded number with direction arrow, delta, and trend graph in your notification bar.
• Configurable alerts — eight alert types (urgent low, low, high, urgent high, low soon, high soon, stale data, push failed), each with its own notification channel. Urgent alerts bypass Do Not Disturb by default; any alert can be configured to bypass DND via Android's notification settings. Alerts can be paused by category (Low or High) for a custom duration.
• Predicts where you're heading — shows "Low in X min" or "High in X min" warnings before you cross your thresholds.
• Pushes to Nightscout — automatic, immediate upload to any Nightscout-compatible server. Offline-resilient — readings queue and retry.
• Tracks treatments and IOB — fetches bolus and carb data from Nightscout (30-day retention), computes insulin on board with your insulin type's curve.
• Per-meal postprandial analysis — analyzes glucose response to each meal: TIR, peak excursion, recovery time, IOB at meal. Aggregate postprandial profile with AGP-style percentile bands. Configurable meal time slots.
• Follows a remote Nightscout — for caregivers, partners, or parents who need to see someone else's glucose remotely.
• Works with watches and other apps — broadcasts xDrip-compatible intents, runs a local web server, integrates with Garmin watchfaces.
• Exercise-BG analysis — reads exercise sessions from Health Connect (Garmin, Samsung Health, etc.), overlays exercise bands on the glucose graph, and shows before/during/after BG breakdown with post-exercise hypo detection.
• Exercise stats — aggregate BG patterns across sessions grouped by activity type (Running, Cycling, Strength, etc.) and metabolic profile (Aerobic, Resistance, High-Intensity). Hypo rate, average entry BG, drop rate, recovery patterns.
• Pre-activity guidance — readiness card before scheduled workouts. Evaluates current BG, trend, IOB, and 30-min forecast. Generates carb recommendations adjusted for IOB and time until workout. Compound risk detection (falling BG + low-ish starting point + upcoming exercise).
• Workout schedule — reads planned workouts from your Android calendar. Shows upcoming sessions with pre-activity status so you can prepare.

How It Works¶

Strimma supports four data sources. Most users use Companion mode, which reads glucose from your CGM app's notification:

graph LR
    A[CGM Sensor] -->|Bluetooth| B[CGM App]
    B -->|Notification| C[Strimma]
    C -->|Display| D[Phone Screen]
    C -->|Push| E[Nightscout]
    C -->|Alert| F[Sound/Vibration]
    C -->|Broadcast| G[Watches & Apps]

You can also receive glucose via xDrip Broadcast (from xDrip+, Juggluco, AAPS, or GlucoDataHandler), Nightscout Follower mode (for remote monitoring), or LibreLinkUp (Abbott's cloud for Libre 3 users). See Data Sources for all options.

Who Is Strimma For?¶

• People with Type 1 or Type 2 diabetes who want an open-source glucose display with configurable alerts and Nightscout integration.
• Parents and caregivers who want to follow a loved one's glucose remotely via Nightscout follower mode.
• DIY diabetes tech users who want an open-source, hackable CGM display that respects the Nightscout protocol.
• Closed-loop users (CamAPS FX, AndroidAPS) who need a parallel display without interfering with their loop.

Quick Start¶

1. Install Strimma — download from GitHub Releases
2. Set up permissions — choose your data source and grant required permissions
3. See your first reading — watch the data flow

Requirements¶

• Android 13 or newer (API 33+)
• A glucose data source — one of:
  • A CGM app that shows glucose in notifications (see Supported Apps)
  • An app that sends xDrip-compatible broadcasts (xDrip+, Juggluco, AAPS)
  • A remote Nightscout server to follow
  • A LibreLinkUp account (for Libre 3 users)
• For Nightscout push: a Nightscout server URL and API secret

Open Source¶

Strimma is free, open-source software licensed under GPLv3. No ads, no tracking, no data collection. Your glucose data stays on your device and your Nightscout server.

View on GitHub

Built By¶

I'm Per Sjöström, a software engineer with Type 1 diabetes. Strimma started as a personal tool to replace xDrip+ with something modern, and grew into an open-source project for anyone who wants better control over their CGM data. I also build Springa, a workout generator and BG management system that receives data from Strimma via the Nightscout API.