We're here to help.
Reach a real human, browse FAQs, or rate the app — usually we reply within one business day.
Email support
Best for account issues, refunds, and bug reports.
carblenscustomersupport@gmail.com
Rate Carb Lens
Ratings help others discover the app.
Frequently asked questions
How accurate are the carb estimates?+
Carb Lens uses AI vision models trained on nutrition data to estimate carbs, sugar, protein, and calories from a photo. Estimates are typically within ±15% for common foods, but you should always verify before dosing insulin.
Is Carb Lens free?+
Yes. Free users get 5 AI scans per day. Pro removes the limit and unlocks history sync. You can also earn extra scans by watching a short ad in the mobile app.
How accurate are the estimates?+
Carb Lens gives you AI-powered nutrition estimates that are great for everyday tracking. For insulin dosing or clinical decisions, cross-check with a glucose meter and your care team.
How do I cancel my subscription?+
Web subscriptions can be cancelled from the Pricing page or by emailing support. iOS subscriptions are managed in your Apple ID Subscriptions settings.
How is my data handled?+
Photos are processed for analysis and not used to train third-party models. See our Privacy Policy for full details.
I found a bug or want a feature.+
Please email carblenscustomersupport@gmail.com with a screenshot and a quick description. We read every message.
Still stuck? Email carblenscustomersupport@gmail.com or read our Privacy Policy.
Sources & citations
Carb Lens is an educational nutrition tracker and is not a medical device. The targets, formulas and general guidance in the app are adapted from the public clinical and nutrition references below. Always confirm insulin dosing and treatment decisions with your own care team.
- American Diabetes Association. Standards of Care in Diabetes — 2025 (carbohydrate counting, glycemic targets, MNT).
- U.S. Department of Agriculture & HHS. Dietary Guidelines for Americans, 2020–2025 (macronutrient ranges, added sugars).
- U.S. Department of Agriculture, Agricultural Research Service. FoodData Central (per-food nutrient reference values used for AI estimates).
- World Health Organization. Guideline: Sugars intake for adults and children (free-sugar limit < 10% / ideally < 5% of energy).
- Mifflin MD, St Jeor ST et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr 1990;51(2):241–7. PubMed (BMR formula used to compute calorie targets).
- American College of Sports Medicine. Physical Activity Guidelines (activity multipliers and weekly exercise targets).