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Business

How Lettras sustains itself: it is free to play and supported by ads, and the developer SDK is free too and runs locally. For those who need more, we offer puzzles with your brand for clients, schools and publications, and plans for book authors, publishers and newsletters, with a commercial license, delivery in PDF, PNG and SVG, all six languages and every accent.

Lettras for developers

The SDK is free and runs locally, with no server and no keys. Bring the Lettras engine to your app, website or AI agents, with the same native letters in six languages and no data sent anywhere.

Word search SDK

Generate, fill and check word searches with every accent, and write text in Unicode styles. A local Rust engine for npm, Kotlin and an MCP server for your AI agents.

  • npmnpm i lettras
  • Kotlinorg.lettras.artificialss:lettras
  • MCP serverhttps://mcp.lettras.org/mcp

Free use of the MCP server

  • Small puzzles (up to 10×10 and 10 words): free and unlimited.
  • Larger puzzles: 5 free per client.
  • Filling with letters: 100 uses per client.
  • Unicode text styles: no limit.
View on GitHubnpm packageKotlin package

Unicode styles SDK

Write text in 22 Unicode styles (bold, italic, script, fraktur, circled, strikethrough…) that keep accents. It is the engine behind Social Media Styles, available in npm, Kotlin and the MCP server.

  • npmnpm i lettras
  • Kotlinorg.lettras.artificialss:lettras
  • MCP serverhttps://mcp.lettras.org/mcp
Examples
npm     stylize('piña', { style: 'bold' })
Kotlin  lettras.stylize("piña", style = "bold")
MCP     stylize_text · list_styles
  • Accents are kept: an ñ is the styled n plus its tilde.
  • It tells you which characters a style cannot draw (ß, Æ, Œ, Ø…), so you can show them as an empty box.
  • No usage limit, local and with no keys.
DocumentationView on GitHubnpm packageKotlin packageTry the styles

  • Sudoku SDK

    Generate sudokus from your code, with the same local engine.

    Soon

  • Crossword SDK

    Crosswords from your code and from AI agents.

    Soon

For book authors and newsletters

The SDK is free. What we offer is generating and delivering the content to each customer: puzzles ready for your book or newsletter.

  • Authors

    $3.99/ month

    $29 one-time

    • Commercial licence for your books
    • Delivered as PDF, PNG and SVG with answer keys
    • All 6 languages, every accent

    Limit: Up to 100 puzzles a month in each generator

    AuthorsSoon

  • Publishers

    $9.99/ month

    $79 year

    • Unlimited books and series
    • Content delivered in bulk, by theme and language
    • Everything in Authors

    Limit: Up to 1,000 puzzles a month in each generator

    PublishersSoon

  • Newsletters

    $19/ month

    Up to 10,000 subscribers

    • A fresh puzzle delivered for every issue
    • Embeddable image and PDF, no watermark

    Limit: Up to 30 puzzles a month in each generator

    NewslettersSoon