Third-party code
iPhone: Kefe for iPhone contains no third-party code. There are no external packages, no advertising or analytics SDKs, and no vendored libraries. It is built entirely on frameworks published by Apple as part of iOS (among them SwiftUI, SwiftData, HealthKit, VisionKit, StoreKit, Swift Charts and UserNotifications), used under Apple’s developer terms.
Android: Kefe for Android is built with Android Jetpack libraries (Compose, Material 3, Room, Navigation, CameraX and the Health Connect client), Kotlin, kotlinx.serialization and ZXing for barcode reading, all under the Apache License 2.0, whose full text is also included in the app. Purchases use Google’s Play Billing Library under the Android Software Development Kit License. There are no advertising or analytics SDKs.
Open Food Facts
Barcode product data comes from Open Food Facts, a free database built by its contributors. The database is made available under the Open Database License (ODbL) v1.0, and its individual contents under the Database Contents License (DbCL) v1.0. © Open Food Facts contributors. openfoodfacts.org.
USDA FoodData Central
Values for basic foods and drinks, and the ingredients of the home dishes, are taken from USDA FoodData Central (SR Legacy, 2018), which is in the public domain under CC0 1.0. Household measures and dish values are estimates. Source: U.S. Department of Agriculture, Agricultural Research Service. FoodData Central. fdc.nal.usda.gov
CoFID
Fish and chips values (takeaway cod in batter and chip shop chips) are from McCance and Widdowson’s The Composition of Foods Integrated Dataset 2021 (CoFID), Public Health England. Contains public sector information licensed under the Open Government Licence v3.0. gov.uk
Compendium of Physical Activities
MET values for work and sport are from the 2024 Adult Compendium of Physical Activities. Herrmann SD, Willis EA, Ainsworth BE, et al. 2024 Adult Compendium of Physical Activities: a third update of the energy costs of human activities. J Sport Health Sci. 2024;13(1):6–12. pacompendium.com
Formulas
Resting metabolism uses the Mifflin–St Jeor equation. Mifflin MD, St Jeor ST, Hill LA, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241–247.
Coffee chains
Coffee values are compiled from the nutrition information published by Starbucks UK, Costa Coffee, Pret A Manger and Caffè Nero (United Kingdom, October 2026) and may differ from what you are served. These names are trademarks of their respective owners. Kefe is not affiliated with, endorsed by or sponsored by these companies. Pret publishes values for its regular size only; Kefe estimates the large size as regular × 16/12.
Icons
On iPhone, interface symbols are from SF Symbols, provided by Apple and used under the SF Symbols licence, only within the app’s interface as that licence requires. On Android they are Material Icons by Google, under the Apache License 2.0.
The app itself
Kefe © 2026 Unsel Studio. All rights reserved. Kefe is not open source; this page exists to state plainly what it is built from.
Trademarks
Apple, iPhone, Apple Watch, Apple Health, HealthKit, iCloud and SF Symbols are trademarks of Apple Inc. Android, Google Play and Health Connect are trademarks of Google LLC. Kefe is not affiliated with, endorsed by or sponsored by Apple Inc. or Google LLC.
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