The 4th Stripe

Turn manuals and notes into focused flashcards, run scored tests, track daily goals, and keep your study library synced across web, iPhone, and iPad.

The 4th Stripe is an aviation study workspace built for airline pilots preparing for training, checks, and upgrades.

Build a focused study library:

• Organize flashcards into decks and folders • Track study progress across your devices • Mark important cards with bookmarks and reusable tags • Run scored tests from decks, folders, tags, bookmarks, or your full library • Review saved results and retest missed questions • Set daily goals, log progress, protect streaks with duty-day breaks, and review your calendar • Reference built-in A320 limitations and memory items • Read imported PDF manuals beside the study workspace on iPad • Draft flashcards with your own optional AI provider and API key

Your decks, progress, tests, goals, bookmarks, and tags can sync securely between the web app, iPhone, and iPad. The app also keeps local recovery points and supports cloud backups and restore.

PDF manuals remain on the device where you import them and are never uploaded. The app contains no advertising, analytics, or tracking.