Services and sources behind the game
The Flag Slice Third-Party Notices
The Flag Slice relies on carefully selected platform services and open data. Each provider operates under its own terms and privacy policy.
Last updated 7 October 2026Flag data
The list of flags, with the names, kinds, and places they belong to, is derived from Wikidata, which is available under CC0. The colour percentages are measured by us from each flag's image and are our own calculation.
Flag images
Flag images are shown only after a puzzle is finished and come from Wikimedia Commons. Most are in the public domain. Others are licensed under Creative Commons Attribution or Attribution-ShareAlike licences (versions 2.5, 3.0, and 4.0) or released under CC0. Where an image has an author or a licence that requires credit, the author and licence are shown with the image in the app.
Images are resized for display and otherwise unchanged. Each image's page on Wikimedia Commons carries its full licence text and history.
If you are the author of an image and believe it is credited incorrectly, email hello@leonfrontier.com.
Apple
Apple provides iOS distribution, Sign in with Apple, App Attest device checks, device platform services, and store infrastructure.
Google provides Android distribution, Google sign-in, Play Integrity device checks, Google Mobile Ads, User Messaging Platform consent controls, and signed rewarded-ad verification.
Expo
Expo provides application tooling and push-notification delivery for reminders that players choose to enable.
Advertising SDKs
Advertising is delivered by the Google Mobile Ads SDK, including its User Messaging Platform for consent, under the Google AdMob terms and Google's privacy statement. The React Native bindings, react-native-google-mobile-ads, are published by Invertase under the Apache License 2.0.
Typefaces
The app bundles the Fraunces, DM Sans, Playfair Display, and Space Grotesk typefaces, each distributed under the SIL Open Font License 1.1.
Application platform
The application is built with the Expo SDK and React Native, distributed under the MIT licence, together with their open-source dependencies.
Open-source software
The application includes further open-source packages under their respective licences. Package-level notices remain available with the distributed software and source dependency records.
Flag content is prepared offline. The live game never queries Wikidata or Wikimedia Commons while you play.
Questions
For questions about these notices, email hello@leonfrontier.com.
Still need help?
hello@leonfrontier.com