v39Revised Japanese interface text throughout to sound more natural, and finished translating a few screens (Active Learning, install prompts) that had been left in English.
v38Added a one-time welcome guide for new installs (re-viewable anytime from Settings) and a new Stats screen with streaks, mastery counts, and recent accuracy, plus fixed a few theme-color inconsistencies in modals.
v37Kiku now teaches bidirectionally, with a full English track and an interface that switches instantly from Settings, plus fixes to sentence mastery, word-practice partial credit, and quieter background updates.
v36Added a cross-platform "Add to Home Screen" prompt, fixed the installed-app status/navigation bar to use a consistent neutral color, added a Learning Pace setting, fixed theme colors on the explanation modal and several buttons, and added a background update checker that keeps the app current automatically.
v35Improved teaching and practice flow, added prayer language, finalized theme transitions and Spectrum Shift, updated the app icon, and fixed several small internal bugs.
v34Finalized the theme system with material-based palettes, smooth color/material transitions, theme-cycle refinements, and improved iOS installed-app behavior.
v33Reorganized Objectives into five Christian communication domains, rebuilt Language Skills, expanded practical expressions and Explain, and refined Active Learning.
v32Added question-type filters and the Active Learning drawer with proficiency and status summaries.
v31Rebuilt Kiku around fixed Lesson, Objectives, and Settings views with compact stats and anchored lesson actions.
v30Added sentence objectives, Theme Cycle, and improved audio behavior when changing filters or practice modes.
v29Compacted branding and Settings, moved study filters into Objectives, added Danger Zone, and simplified controls.
v28Reworked Word Practice into a rolling adaptive vocabulary pool with proficiency-gated progression and maintenance review.
v27Established Kiku: Christian Japanese as the official identity, added install metadata and icon support, and preserved legacy progress compatibility.
v26Renamed the app Kiku: Christian Japanese and expanded Sentence Practice with curated combinations from learned material.
v25Reworked themes into a mobile-friendly visual palette gallery and expanded the theme collection.
v24Completed theme coverage across the interface and improved study-filter controls.
v23Expanded themes across the full UI and added several new palettes.
v22Added audio Skip, selectable themes, Theme Cycle, and the changelog.
v21Expanded Explain into richer mini-lessons with structure, usage, contrasts, and terminology.
v20Unified learning into Word Practice and Sentence Practice with category filters.
v19Expanded testimony vocabulary, sentence patterns, learning objectives, and prayer practice.
v18Made Learning Tags reveal Seen / Correct / Wrong / Proficiency stats.
v17Added mastery celebrations, confetti, and a mastery sound.
v16Added local saving plus portable backup export/import.
v15Enabled Explain before answering and improved component explanations.
v14Added explicit introductions before newly unlocked material is tested.
v13Rebuilt the learning engine around lexical/form tags, retries, mastery protection, expanded verb forms, and listening practice.
v12Introduced the atomic-tag model, redemption queue, and mastery immunity/protection concepts.
v11Fixed startup one-choice form questions and missing data for newer verb forms.
v10Added dedicated teaching for suru verbs and the reusable suru conjugation engine.
v9Added polite negative, polite past, and volitional forms.
v8Added four drill modes and more structured adaptive scheduling.
v7Improved hierarchical verb/form mastery and adaptive progression.
v6Shifted scheduling toward verb-centric mastery and stronger weak-item targeting.
v5Added menus, mastery visibility, and broader progress controls.
v4Added contextual teaching explanations and reduced answer leakage.
v3Added feedback tones/flashes and faster answer flow.
v2Added automatic audio and quick-answer behavior to the romaji-first trainer.
v1Initial adaptive church Japanese verb trainer with 20 high-value verbs and five forms.