Kronos vs Retro Game Guides

Kronos is a companion app for Call of Duty Zombies players, providing Easter Egg guides, interactive maps and in-app tools. Guides divide Easter Eggs into steps with screenshots, and players can check off objectives to track progress. The homepage says coverage spans more than 40 maps, from Nacht der Untoten to Shattered Veil. A Memorizer tool tracks Simon Says color and number sequences and includes a one-tap reset. Players can vote on the next CoD Revival and view a countdown and community vote results. Kronos works offline and syncs offline; its free plan requires no signup. For phone sign-in, it stores a phone number and Firebase user ID to sync progress, bookmarks and guide history across devices. Its privacy policy says Firestore access is restricted to the authenticated account and users can delete their account in app settings. Kronos is available on Android, iOS and web. The privacy policy also lists Firebase Authentication, Cloud Firestore, Analytics, Crashlytics and Cloud Messaging.

Retro Game Guides is an iPhone and iPad offline reader and library for classic game walkthroughs. Reflow, Original, and No wrap layouts provide different reading presentations; Reflow adjusts prose to the phone width while preserving recognized maps and tables. Guide headings become a Contents view, search results include surrounding passage context, and each guide keeps its reading position. Readers can highlight passages, add notes, and bookmark locations, collected in the Notes tab. Plain-text imports up to 10 MB support folder previews, duplicate skipping, and review of uncertain matches. Supported online guide pages can be saved as attributed text snapshots for offline reading. The library also includes original Standard Edition walkthroughs whose pages identify game platform and route scope. Once content is available on-device, reading, organization, search, progress, favorites, bookmarks, highlights, and notes work offline. The maker says there is no account, advertising, analytics, tracking, or cloud-sync service. The free plan covers up to three games; Unlimited Library costs $4.99, paid once.