CarbCam is an app for iOS and Android that estimates carbs, calories, fat, protein and FPE from a photo — designed specifically for people with diabetes.

Open the Scan tab, take a photo of your meal, crop the image and wait for the result. Three steps — done. A detailed walkthrough is available in the Tour.

Yes. Tap the gallery icon next to the shutter button in the Scan tab and select an existing image.

carbs Carbohydrates · kcal Calories · FPE Fat-Protein Units · Fat Fat · Protein Protein

Fat-Protein Units describe the delayed effect of fat and protein on blood glucose. Formula: (Fat × 9 + Protein × 4) ÷ 100. More details at How does CarbCam work? → FPE.

Yes. The photo is sent to the ns.10be.de server and forwarded from there to the selected AI provider. A resized thumbnail and the analysis result are cached on the server so that identical or similar photos can be answered more quickly later. Optionally, a re-encoded version of the photo is stored for your personal photo history — you can delete it at any time in the app settings. Details at Privacy Policy.

The ns.10be.de server processes and stores the following data:

• Analysis cache: image hash, resized thumbnail and AI response (nutritional values) — automatically deleted after 90 days
• Photo history (optional): re-encoded versions of your photos, tied to your installation ID — deletable via the app
• Subscription & quota: installation ID, plan, analysis counter, Stripe customer data
• Feedback: your corrections and comments on analyses
• BG curve analysis: blood glucose values sent by the client are analysed server-side (not stored permanently)

Meal entries (title, timestamp, nutritional values) are stored locally on your device and optionally synced to your own Nightscout. Full details at Privacy Policy §3.

Yes. Under Settings → AI Provider you can enter your own Anthropic, Google, OpenAI, Zhipu or Azure key. The analysis then runs through your own account with the respective provider and does not count against your analysis quota. The ns.10be.de server forwards the request with your key to the AI provider.

Here: Privacy Policy — or in the app under Settings → Legal → Privacy.

Clear portions (rice, pasta, bread): approx. ±20 %. Complex meals (stews, casseroles): approx. ±30 %. Very unusual dishes: ±40 % or more. Packaged products with automatically detected barcode: ±5 % (manufacturer value via Open Food Facts). Detailed table at Accuracy.

Common reasons: hidden ingredients (e.g. sauce underneath vegetables), unusual portion sizes or poor lighting. Tips: crop the photo, shoot from a slight angle above, separate individual components.

After the AI analysis, CarbCam cross-checks the values against a local database (USDA, Open Food Facts). If, for example, the AI estimates 80 g carbs for an apple, this is automatically corrected downward.

Yes, at any time. Tap “Edit” in the result and adjust carbs, fat, protein or kcal. The corrected values are saved.

No. CarbCam works completely on its own. Nightscout is optional and enables BG curves beneath meals and treatment sync.

Settings → Nightscout → enter URL and API secret → test connection. CarbCam supports mg/dl and mmol/l.

Only the treatment entry (timestamp, carbs, note). Photos are not sent to Nightscout.

Yes! ns.10be.de offers managed Nightscout hosting. You can enter your existing ns.10be.de account directly in CarbCam.

The app is free to install. An affordable subscription is available for the AI analysis. Alternatively, you can enter your own API key. Details at CarbCam.

Yes. After installation you receive free credits to thoroughly test the app.

Via the Stripe Customer Portal. You can reach it in the app under Settings → Subscription → Open Stripe Portal. There you can cancel your subscription, change your payment method or view invoices.

Yes. Settings → Subscription → Restore Purchases. Since the subscription is linked to your anonymous installation ID and your Stripe customer, the transfer also works cross-platform (iOS ↔ Android).

iOS 16+ and Android 8+. Both platforms are functionally identical.

Partially. Browsing history, viewing statistics and editing already-analyzed values work offline. New AI analyses, barcode lookups and Nightscout sync require an internet connection. Details at What happens offline?

Currently: Anthropic (Claude), Google (Gemini), OpenAI (GPT-4o), Zhipu (GLM) and Azure (OpenAI). You can switch the provider in Settings or enter your own API key.

Yes. Settings → Data → Export. Available formats: CSV and JSON.

Settings → Data & Update → Export allows a CSV/JSON export of all entries. A full backup/restore feature including photos is in preparation.

No, CarbCam is not an open-source app. However, it uses numerous open-source libraries listed under About CarbCam → Licences.

USDA FoodData Central for nutritional references, Open Food Facts for automatic barcode lookups and OpenStreetMap for reverse geocoding. More details at About CarbCam → Data Sources.

In the app under Settings → Open-Source Libraries. An overview is also available on the About page.