GlucoseOS

A daily glucose JOURNAL in one private offline app. Seven tabs. One file. Yours forever for one price. Not just a tracker - a journaling tool that captures every fasting, pre-meal, and post-meal reading alongside the context that actually explains the numbers: mood, energy, sleep hours, period day, and what you just ate. A 24-hour post-meal spike heatmap built from your real readings shows the windows where your glucose runs high so you can stop guessing and start seeing your own patterns. A meal correlation engine auto-computes your top 5 best foods (smallest pre-to-post spike) and top 5 worst foods (biggest spike) from your own log - no generic food list, just your body. Weekly reflection prompts ask the three questions that matter: what surprised you, what pattern do you want to break, and what was your win this week. PCOS-aware brain-fog flag connects mid-cycle insulin resistance to the brain fog and energy crashes that happen on the same days every month. Weekend vs weekday averages reveal the eating-out drift that fasting numbers alone hide. Time-in-range percentage with custom targets you set yourself. Toggle between mg/dL and mmol/L for US, UK, EU, and Australia readings. Filter your log by 7 days, 30 days, or all-time to see short trends and long arcs side by side. Daily reflection prompts rotate so journaling never feels like the same checkbox. Ships with 14 days of demo seed data so you can see the heatmap and correlations populated before you log your first reading. JSON export and import for backup or moving to a new device. Every entry saves locally to your device. Nothing goes to a server. No account, no subscription, no app store, no annual fee, no health data sold to advertisers. Works on laptop in any browser, and adds to your iPhone or Android home screen as a standalone app for offline use.

WHAT'S INCLUDED

• 7 tabs: Today, Glucose Log, Patterns, Meal Correlations, Mood & Energy, Weekly Reflection, Settings
• Daily glucose log with mood, energy, sleep hours, period day context
• 24-hour post-meal spike heatmap built from your real readings
• Meal correlation engine - top 5 best and top 5 worst foods auto-computed
• Weekly reflection prompts: surprise, pattern to break, win
• PCOS-aware brain-fog flag tied to mid-cycle insulin resistance
• Weekend vs weekday averages reveal eating-out drift
• mg/dL and mmol/L unit toggle (US, UK, EU, AU)
• Time-in-range % with custom target ranges
• Filter log by 7 days, 30 days, or all-time
• Custom fasting, pre-meal, post-meal target ranges
• Daily reflection prompts that rotate so journaling stays fresh
• 14 days of demo seed data on first open
• JSON export / import / reset
• 100% private - data never leaves your device
• Single HTML file - laptop + iPhone + Android home screen, fully offline

100% PRIVATE AND OFFLINE

Your glucose readings, mood notes, sleep hours, period day, and meal entries never leave your device. No account, no cloud, no analytics, no tracking. All your readings, reflections, correlations, and exports live only on this device. Works completely offline.

WORKS ON ALL DEVICES

Open on laptop, add to home screen on iPhone (Safari) or Android (Chrome) as an app. One file, all devices.

INSTANT DOWNLOAD

Download once, use forever. No subscription, no renewal, no expiry.

PERFECT FOR

• PCOS women managing the insulin-resistance side of PCOS
• Metabolic syndrome trackers watching fasting glucose and post-meal spikes
• Biohackers using a finger-stick glucometer (not a CGM)
• People with brain fog or energy crashes correlating to specific meals
• Anyone wanting to see their personal glucose patterns over weeks and months
• Partners helping a pre-diabetic family member journal readings and meals

Questions? Message us on Etsy - we reply within 24 hours.

Disclaimer: Not medical advice. For diabetes management see your endocrinologist or use a clinical diabetes tracker. This is a personal lifestyle journaling tool.