Build the vocabulary
you actually remember.
Lexicon is a dictionary and vocabulary builder for language learners, linguists, and conlang creators. Offline-first, privacy-respecting, and free to start.
Free · iOS · No account required
Everything you need to build a lexicon.
Prefix & infix search
Find any word by how it starts, how it ends, or any segment in between.
Tags & categories
Organise entries by part of speech, theme, difficulty, or any custom tag you create.
IPA pronunciation
Attach IPA notation to any entry so you always know how to say it.
Linked entries
Connect synonyms, antonyms, related words, and word family members across your lexicon.
Undo / redo stack
Full undo history so you can always step back from accidental changes.
JSON export / import
Back up your entire lexicon or move it between devices in a clean, portable format.
Cloud sync
Access your lexicon across all your Apple devices with real-time sync.
Audio pronunciation
Record or upload pronunciation audio and store it privately in the cloud.
Flashcards & quiz mode
Turn your lexicon into a study deck with spaced repetition.
Shared lexicons
Collaborate on a shared dictionary with other Plus users.
AI-assisted learning
Get AI-generated definitions, example sentences, and synonyms via Claude.
Learning analytics
Per-concept confidence metrics and custom lesson builders with image cloze.
Language learners
Building vocabulary in a second, third, or fourth language? Lexicon gives you a private, searchable place to track every word you learn.
Linguists & researchers
IPA notation, part-of-speech tags, linked entries, and JSON export make Lexicon useful for serious language work, not just casual study.
Conlang creators
Building an invented language? Lexicon was designed with conlang creators in mind — indent hierarchy, custom categories, and prefix/infix search all serve worldbuilding.
Start building your lexicon today.
Free on iOS. No account required. Your words stay on your device.