Premium unlock (one-time purchase):
• Trends & averages — weekly, monthly, and 7-day rolling average with sparkline
• Full history — see every entry, not just the last few days
• Apple Health sync — carb entries write to HealthKit automatically
• CSV export — download entries to share with your doctor or dietitian

Free improvements:
• Digit input rounding fix — entries snap to the nearest tenth
• Bug fixes and performance improvements