Every public build is listed here with its release date and the changes that affect learners.
v2.4.5
Google sign-in is now required before learning starts. For now, every signed-in Google account is allowed. App access is rechecked with the site, and first-party app launch activity now powers the actual-user dashboard. Your existing learning profile, history, saved words, and review progress remain preserved.
v2.4.4
Learn from all 11,353 reviewed words in English, Japanese, Vietnamese, Thai, or Indonesian. Sessions now choose the next word from your level, recent mistakes, and due reviews, and keep working from the built-in catalog when the connection drops. Your 2.4.3 progress is preserved when you update.
v2.4.3
BS Korean 2.4.3 improves next-word selection with device-adaptive practice ability, due-only review targets, clearer practice and account level explanations, and complete five-language offline catalog snapshots. It preserves the existing site signing identity and local app data; uninstall is not required.
v2.4.2
BSKorean 2.4.2 improves multilingual catalog downloads on slower connections, preserves an active English lesson when changing the learning language, restores locale downloads after relaunch, prevents duplicate rapid-answer recording, and keeps Review navigation in the intended flow. It retains five exact-locale catalogs, Google sign-in, the 2.4.1 learning data during an in-place update, and the same official signing identity.
v2.4.1
BSKorean 2.4.1 keeps study streaks correct across timezone and daylight-saving changes, retries only safe progress-sync requests after temporary network or server failures, and improves account-deletion and API input safety. It keeps the same exact-locale learning catalog, Google sign-in contract, learning rules, and site signing identity. It upgrades 2.4.0 in place; uninstall is not required.
v2.4.0
BS Korean 2.4.0 makes account, level check, review, offline, and lesson-completion messages clearer in all five supported languages. It keeps the same learning data and rules, exact-locale catalog, Google sign-in contract, and site signing identity. It also improves reliability when many learners save progress at the same time. It upgrades 2.3.0 in place; uninstall is not required.
v2.3.0
BS Korean 2.3.0 improves answer-choice clarity with a bold primary meaning and quieter supporting detail, removes internal decision-rule wording, localizes review status, and keeps the same learning data, Google sign-in, catalog, and site signing identity. It upgrades 2.1.0 in place; uninstall is not required.
v2.1.0
BS Korean 2.1.0 replaces parallel progress counters with one deterministic, server-backed learner snapshot. It preserves learning events, upgrades local data to schema v11, separates verified, estimated, mastered, and due counts, hides vocabulary estimates until 20 distinct Korean words have evidence, stores all 20 placement responses, and keeps one canonical level across all languages. This APK upgrades 2.0.0 in place with the same certificate; uninstall is not required.
v2.0.0
BS Korean 2.0.0 is signed with a new site certificate. Anyone who installed 1.1.0-rc99 must uninstall it before installing 2.0.0; uninstalling removes device-local learning data. The new signing certificate is registered with Google OAuth, and Google Credential Manager reaches the Google account sign-in screen without a signing or client-configuration error. A real-account post-registration sign-in and sync test is still pending; guest learning remains available.
v1.1.0-rc99
RC99 waits for the selected-language catalog before learning, prevents stale translations from entering saved-word sessions, preserves level and history without forcing a diagnostic, localizes core learning and feedback flows, keeps Next anchored at the bottom, bounds typed answers, and withholds vocabulary estimates until enough distinct-word evidence exists. Google sign-in is now registered for the published package and signing certificate and passed real account login, online learning sync, direct Home routing, and session restoration after relaunch.
v1.1.0-rc98
Login now opens Home after successful sign-in. The optional TOPIK diagnostic remains available from language and level settings.
v1.1.0-rc97
Improves language-change onboarding for non-English learners. The first screen now exposes the language selector in English, Vietnamese, Indonesian, Thai, and Japanese; language choices are shown in their own language; core home, study, card, quiz, and feedback actions follow the selected helper language. Word learning data continues to come from the live locale-specific Word DB API. This build starts a new BSKorean app signing key lineage, so existing rc96 installs may need to uninstall the old app before installing rc97.
v1.1.0-rc96
Introduces the deterministic bsk-learning-v2 learning engine with event-based word progress, unified quiz and review scheduling, distinct-word vocabulary estimates, durable offline sync, and live word-catalog updates. Improves answer-choice cards, adds a bottom Next action, and refreshes the language, TOPIK start, and Google sign-in action rows while preserving the rc95 visual style.
v1.1.0-rc95
Introduces the new current-app signing baseline and verified Google account sign-in. Catalog refreshes no longer block navigation, and saved words stay consistent across catalog updates. This build is a fresh install relative to the older rc94 test package; sync account data before removing an older local-only installation.
v1.1.0-rc94
Improves startup reliability and keeps learning records stable during background catalog refreshes. Five-language catalogs now accept only completed, reviewed entries and update as new words are approved. Android 8 keyboard submission and user-facing catalog status labels are also refined.
v1.1.0-rc93
Restored the complete Korean backgrounds, cards, buttons, action icons, and hanji bottom navigation from rc91. The five-language dynamic catalog and offline sync introduced in rc92 remain available.
v1.1.0-rc92
Five-language learning data now updates automatically from the reviewed BSKorean catalog. Incomplete translations stay hidden, saved words remain available offline, and inactive words are removed during sync.
v1.1.0-rc91
A clearer Home screen now keeps your TOPIK estimate, known words, recall score, and next review together. The bottom navigation is lighter, easier to scan, and better spaced above Android system controls.
v1.1.0-rc90
Introduced one Korean-inspired visual system across Home, Learn, Quiz, Review, and Settings. Learning, audio, sign-in, review, and navigation behavior are unchanged.
v1.1.0-rc89
Matched the app and website with the same Korean visual language. Added a direct-install test build for learning, quizzes, review, audio, and Google sign-in checks.