HealthInsights

A personal app that visualizes patterns and insights from your HealthKit data. iPhone only. Read-only — it never writes to HealthKit.

What it shows you

The app reads glucose readings (from your CGM), insulin doses (from your pump or manual entries), and carbohydrate entries from HealthKit, then surfaces patterns you’d otherwise have to spot by eye.

Three main views:

• Insights — the front page. Recent overnight stability, time-in-range for the last day/week, and the highest-priority observation right now (e.g., “post-dinner spikes have been larger this week”).
• Patterns — week-over-week comparisons across times of day. Useful for noticing that, say, your post-breakfast control has changed since switching to a different breakfast.
• IOB — a chart of insulin-on-board over the last several hours. Use this to sanity-check timing of recent doses.

Data needs

• Glucose: at least 24 hours of CGM readings to show anything useful. ~7 days for the Patterns view to detect week-over-week shifts.
• Insulin + carbs: as soon as they’re logged in HealthKit, they appear in the IOB chart.

If you’ve just installed and granted HealthKit permissions, expect the Insights view to be sparse for the first day or two while history accumulates.

Where data is processed

Aggregations and pattern detection run on a Supabase backend that Carl operates. Your raw HealthKit data stays on your device; only summarized queries go to the backend, and only when you have the app open. See the privacy policy for details.

Settings

There’s a Settings tab for setting your target glucose range (default 70–180 mg/dL) and for toggling Nightscout sync if you use Nightscout (off by default).

Last updated: 2026-05-01