NextLang Reviews and Details

Questions & Answers

1. What makes NextLang unique?

   It is the only AI flashcard generator I know of that exports a native .mochi package with the audio embedded, which works without a Mochi Pro subscription. The same generation also produces a native Anki .apkg with the mp3 files inside, so the deck keeps speaking in Anki with no add-on and no external TTS service. Word audio is free on every account, in 20 languages. The other unusual input is the CEFR level: A1 to C1 is a field, not a marketing claim, so an A2 deck and a C1 deck built from the same text hold different words and different examples.

2. Why should a person choose NextLang over its competitors?

   Because the deck lands in the app you already study in, in that app's own format, and it already has audio. General-purpose generators hand you a CSV to wrangle; flashcard apps make you write the cards yourself. NextLang covers Anki, Mochi, Quizlet and Brainscape from a single source, shows every card on screen for editing before anything is exported, and charges credits instead of a subscription: 5 free credits that refill every 30 days without a card, then one-time packs from $5 that never expire. If an export will not import, the credit is refunded.

3. How would you describe the primary audience of NextLang?

   Independent language learners who already use a spaced repetition app and build their own decks: people mining vocabulary from books, articles, podcasts and subtitles, and studying it in Anki or Mochi. Secondary audience is language teachers preparing level-appropriate decks for a class, since CEFR level and card count are explicit inputs. It is not aimed at people looking for a course.

4. What's the story behind NextLang?

   I study languages with spaced repetition myself, and the boring part was never the reviewing, it was building the deck: translating, writing example sentences, wrestling a CSV into the right shape and then discovering the cards had no audio. AI could clearly do the first half, but every generator I tried stopped at a text dump and left the import problem to me. So NextLang was built the other way round, starting from the file the app actually wants: a real .apkg or .mochi with the mp3 files already inside, generated from the language pair and level you specify.

5. Which are the primary technologies used for building NextLang?

   Next.js 16 and React 19 with TypeScript, Drizzle ORM over Neon Postgres, better-auth for Google sign-in, Stripe for payments, the OpenAI API with structured outputs for card generation, Azure Speech for neural text-to-speech, and Cloudflare R2 for media storage. Deployed as a Docker container on a VPS.