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UserProgress gains selectedLevelsBlob and enabledIrregularCategoriesBlob (mirrors the existing tense-blob pattern). The multi-level setter keeps the legacy selectedLevel String in sync with the highest-ranked selection, so widget sync, AI scenarios, and achievement checks keep working unchanged. Legacy single-level users are migrated on first read. Settings replaces the level Picker with per-level toggles and adds an Irregular Types section with three toggles. Practice pool is the literal intersection: empty levels means zero results, empty irregular categories means no irregularity constraint. Pure filter logic lives in SharedModels (PracticeFilter, VerbLevel.highest) and is covered by 20 Swift Testing cases. ReferenceStore delegates so the intersection behavior is unit-tested without a ModelContainer. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Conjuga
A Spanish-learning iOS app that combines verb conjugation practice, a full textbook reader, an AI conversation partner, offline dictionary lookups, grammar exercises, and more. Runs entirely on-device where possible (Foundation Models, Speech framework, Vision OCR).
Features
Verb practice
- Six conjugation modes — flashcards, typing, multiple choice, handwriting (Apple Pencil / finger), sentence builder, and full-table (conjugate all persons at once)
- Focus modes — weak verbs (SM-2 spaced repetition), irregularity drills (spelling / stem / unique), common tenses
- 1,750 verbs across 5 levels (Basic → Expert) with 209 K pre-conjugated forms and 23 K irregular-span annotations
- 20 tenses — every indicative, subjunctive, conditional, and imperative tense, each with character-level irregular highlighting
- Irregularity filter — search the verb list by Any Irregular / Spelling Change / Stem Change / Unique Irregular, combinable with level filter
- Text-to-speech on any form
Content & study
- Textbook reader — 30 chapters of Complete Spanish Step-by-Step with 251 interactive exercises (keyboard + Apple Pencil), 931 OCR'd vocab tables rendered as Spanish→English grids (~3 100 paired cards extracted via bounding-box OCR)
- Course decks — weekly vocab decks with example sentences, week tests, and cumulative checkpoint exams
- Stem-change toggle on Week 4 flashcard decks (E-IE, E-I, O-UE, U-UE) showing inline present-tense conjugations
- Grammar guide — 20 tense guides with usage rules and examples + 20+ grammar topic notes (ser/estar, por/para, preterite/imperfect, etc.), each with 100+ practice exercises
- Grammar exercises — interactive quizzes for 5 core topics (ser/estar, por/para, preterite/imperfect, subjunctive, personal a)
AI & speech
- Conversational practice — on-device AI chat partner (Apple Foundation Models) with 10 scenario types; chat bubbles have tappable words that open dictionary / on-demand AI lookup
- AI short stories — generated stories with tappable words and comprehension quizzes
- Listening practice — listen-and-type + pronunciation scoring via the Speech framework
- Pronunciation check — word-by-word match scoring
Vocabulary & tools
- Offline dictionary — reverse index of 175 K verb forms + 200 common words, cached to disk for instant lookups
- Vocab SRS review — spaced repetition over course vocabulary with Again / Hard / Good / Easy rating
- Cloze practice — fill-in-the-blank sentences with distractor generation
- Lyrics practice — search, translate, and read Spanish song lyrics
Tracking & sync
- Progress — streaks, daily goals, accuracy stats, achievement badges, study-time tracking per day
- CloudKit sync — review progress, test results, saved stories, conversations, and textbook attempts sync across devices
- Widgets — combined dashboard + word-of-the-day, refreshed daily and on backgrounding
Architecture
- SwiftUI + SwiftData with a dual-store configuration:
- Local store (App Group
group.com.conjuga.app) — reference data: verbs, forms, irregular spans, tense guides, course decks, vocab cards, textbook chapters. Seeded from bundled JSON on first launch. Self-healing re-seeds trigger on version bumps or if rows are missing on disk. - Cloud store (CloudKit
iCloud.com.conjuga.app, private database) — user data: review cards, course reviews, user progress, test results, daily logs, saved songs, stories, conversations, textbook exercise attempts.
- Local store (App Group
- SharedModels Swift Package shared between the app and widget extension. Widget schema must include every local-store entity or SwiftData destructively migrates the shared store.
- Foundation Models for on-device AI generation (
@Generablestructs for typed output). - Vision framework for OCR of textbook pages and vocabulary images.
- Speech framework for recognition and pronunciation scoring.
- Textbook extraction pipeline (
Conjuga/Scripts/textbook/) — XHTML and answer-key parsers, macOS Vision image OCR + PDF page OCR, bounding-box vocab pair extractor, NSSpellChecker-based validator, and language-aware auto-fixer.
Requirements
- iOS 18+ (iOS 26 for Foundation Models features)
- Xcode 16+
Building
Open Conjuga/Conjuga.xcodeproj in Xcode and run on a simulator or device. Reference data seeds automatically on first launch. To regenerate textbook content, run Conjuga/Scripts/textbook/run_pipeline.sh locally — the generated textbook_data.json / textbook_vocab.json are committed so fresh clones build without the pipeline.