The 10 Best AI Tools for Vocabulary Building in 2027

Lingvist is built around vocabulary. Its AI places you at the right level so you start learning the most relevant words immediately, across 50+ languages. The annual plan is $79.99 a year ($6.67 per month) with a 14-day free trial, and Monthly is $9.99. You can also create your own vocabulary deck with Custom Decks.

Readlang saves every word you translate on a text or site and lets you practice them with flashcards. Its AI gives context-aware explanations of words and phrases. Free is $0 with 10 context explanations per day; Premium is $6 a month or $48 a year with unlimited explanations, and Premium Plus is $15 a month or $120 a year.

LingQ turns a Netflix show or a song into a lesson with AI tools: transcripts, translations and audio. Its Lynx AI assistant helps you read, listen and build vocabulary in 53 languages. The App Store lists Premium at $14.99 a month or $119.99 for 12 months, and Premium Plus at $29.99 a month or $269.99 a year.

Duolingo Max is a subscription tier above Super Duolingo with Video Call and Roleplay, both powered by generative AI. After a Roleplay you get AI-powered feedback on the accuracy and complexity of your responses. It is available in 188 countries on iOS and Android; Duolingo’s Max page does not publish a price.

Memrise teaches with real native video, smart review and private AI practice, and says you can start learning for free. Its App Store listing describes AI Buddies, personalised language learning bots for speaking practice, with a Monthly Language Learning Plan at $24.99 and an Annual plan at $61.99.

Speak puts you in back-and-forth conversation with the Speak Tutor AI, which gives real-time feedback. It offers a 7-day free trial and has been downloaded more than 15 million times. The App Store lists Monthly Premium at $17.99 and Annual Premium at $83.99.

Busuu includes Vocabulary Review in Premium, which costs $72.99 for 12 months ($6.08/month). AI conversations and pronunciation practice come with Premium Plus at $87.90 for 12 months ($7.33/month), in select languages and on select platforms.

WordUp teaches 30,000+ real-life English words with smart review systems and spaced repetition. It belongs to the Zann Suite, described as an AI-powered language learning suite. Annual Pro is £49.99 a year and Lifetime is £149.99.

Quizlet builds a study set from notes you type, paste or upload, and can turn audio recordings into flashcards automatically. Ask Quizlet gives instant, clear explanations. Quizlet Plus is listed at $9.99 and $44.99 in the iOS app, without billing periods.

ChatGPT is a general assistant, not a dedicated vocabulary app. Free is $0 with unlimited text chats with GPT-6, subject to abuse guardrails; Go is $8 a month with more messages, uploads and voice chats (it may include ads); Plus is $20 a month with expanded memory and context.