Blood Sugar Journal

The core of the app is a single chronological feed where every entry carries a time and a type. You log glucose values, short-acting and long-acting insulin separately, and meals with carb counts. Keeping insulin types apart is the useful part: it turns a messy glucose log into something you can actually read. It lets you compare rapid doses against long-acting ones when you look back at glucose changes. Entering a value takes a few seconds. That's the whole point of a daily diary.

The daily overview gives you your latest glucose value, the day curve, and a few recent observations the moment you open the app. Weekly views show how readings shift across recent days. That's more useful than any single number. Charts are clean and readable rather than packed with dense analytics, so you can glance at your phone and get the shape of your day.

Think of it as an HbA1c tracker that sits right next to your daily entries. You store HbA1c results and follow the long-term trend without switching screens. Seeing the three-month average in the same view as your day-to-day readings helps you connect the two, especially when a good HbA1c hides a lot of daily swings. It's a small feature. It also fixes a common complaint about logbooks that treat long-term and daily data as separate worlds.

The free version produces simple on-device summaries based on your recent data and event timing. These run locally, so nothing leaves your phone. Blood Sugar Journal Pro adds AI-written text summaries built from your journal data, focused on patterns and context rather than treatment advice. If the free observations feel too basic, the Pro summaries are the main reason to consider paying.