Glucose Buddy is a free diabetes management app for iPhone and Android that logs glucose, insulin, carbs, medications, and exercise. It calculates an estimated A1C from logged glucose values, produces clinician-ready PDF reports, and offers reminders. A premium subscription adds advanced analytics. The app is best suited for users who want a simple unified log; those needing strong CGM integration may prefer alternatives.
What Glucose Buddy Tracks
| Data Type | What You Log |
|---|---|
| Blood glucose | Manual readings or imported from connected meters |
| Insulin doses | Bolus, basal, type, units |
| Carbs | Per-meal grams, food name, portion |
| Other medications | Metformin, GLP-1s, etc. |
| Exercise | Type, duration, intensity |
| Weight | Periodic check-ins |
| Blood pressure | Systolic, diastolic |
| Notes | Free text for context |
| A1C results | Lab-reported A1C separate from estimated |
Free Version Features
- Unlimited basic logging
- Daily glucose graphs
- Estimated A1C calculation
- Reminders for testing and medications
- Basic exports
- Limited history (90 to 180 days depending on version)
- Apple Health sync for some metrics
- In-app community forum and educational content
Premium Features
- Unlimited history
- Custom alerts and reminders
- Detailed weekly and monthly analytics
- Time-in-range and glucose pattern reports
- PDF clinician-ready summaries
- Ad-free experience
- Access to coaching content (varies)
How Glucose Buddy Calculates Estimated A1C
The app uses average logged glucose values to estimate A1C through a regression formula similar to the eAG (estimated average glucose) standard. The accuracy depends on:
- Number of glucose entries (more is better)
- Whether checks are timed across the day or only at certain times
- Whether CGM data is included
- Recent activity over the prior 90 days
Estimated A1C is a useful trend tool but not a substitute for a lab A1C test, which clinicians still need for diagnosis and treatment decisions.
Integrations and Connected Devices
| Device Type | Integration |
|---|---|
| Apple Health | Glucose, weight, blood pressure, steps |
| Google Fit | Activity and weight on Android |
| Some Bluetooth meters | Direct sync |
| CGMs | Indirect via Apple Health (limited) |
| Insulin pumps | Manual entry typically |
| Wearables (Apple Watch, Fitbit) | Activity and heart rate |
How to Use Glucose Buddy Effectively
- Set up profile with diabetes type, target ranges, and medications
- Log glucose readings consistently — fasting, before meals, 2 hours post-meal as relevant
- Enter food at meal time when memory is freshest
- Tag insulin doses to meals or meal-time entries
- Add notes for unusual events (illness, exercise, alcohol)
- Review weekly graphs to spot patterns
- Export PDF before clinic visits
- Compare estimated A1C against lab results to calibrate intuitions
Common Use Cases
- Type 2 diabetes on oral medications: log fasting and post-meal readings, weight
- Prediabetes: track post-meal patterns and lifestyle interventions
- GLP-1 users: log weight, glucose, side effects
- Pregnancy diabetes: log meals and post-meal glucose
- Type 1 diabetes basic users: simple log without complex pump or CGM analytics
- Caregivers: log on behalf of children or older adults
How It Compares to Alternatives
| App | Strengths | Best For |
|---|---|---|
| Glucose Buddy | Simple unified log, free tier, clinician PDFs | Type 2 / basic logging |
| Sugarmate | Strong Dexcom integration, smart alerts | Dexcom power users |
| Tidepool | CGM and pump aggregation, clinician-grade reports | Type 1 with multiple devices |
| Glooko | Multi-device aggregation, clinic uploads | Connected to clinic care |
| One Drop | Coaching plus app | Type 2 wanting structured support |
| mySugr | Gamified logging, easy use | Newly diagnosed adults |
| Apple Health (alone) | System-wide hub, native integrations | Light tracking |
Limitations to Know
- CGM integration is not the strongest in the category
- Bolus calculator is basic compared to dedicated insulin apps
- Some advanced analytics behind paywall
- Limited offline functionality on some features
- Manual entry can be tedious for high-frequency testers
Privacy and Data Use
- Data is stored on the user’s device and Glucose Buddy servers
- Privacy policy details data sharing for analytics and product improvement
- Users can export and delete data
- HIPAA compliance status varies by use case (consumer app, not a clinical record)
- Always review the current privacy terms before adding sensitive data
Tips for Maximum Value
- Be consistent — daily entries produce more useful patterns than sporadic ones
- Photograph foods you eat repeatedly so portion estimation is accurate
- Note context: stress, sleep, illness — these explain outliers
- Set realistic reminder times tied to existing routines
- Bring exported PDF to clinic visits
- Use the educational content for diabetes basics
Related Reading
For more on diabetes self-management and CGM use, see our guides on detection of prediabetes and treatment options.
The Bottom Line
Glucose Buddy is a solid free diabetes-logging app suitable for type 2 diabetes, prediabetes, and basic type 1 self-management. It tracks glucose, insulin, food, exercise, medications, weight, and blood pressure, calculates estimated A1C, and produces clinician-ready PDF reports. Premium adds analytics and unlimited history. CGM integration is limited compared to dedicated CGM apps, so power users with Dexcom or Libre may prefer Sugarmate, Tidepool, or Glooko. For a clean unified log without complexity, Glucose Buddy fits the bill — and consistent use is what turns logging into actionable insights.
