Licenses & Attributions

Last updated: 2026-05-28

LLLock is built on top of open-source software and open language data. This page credits the work we rely on. If you believe content is used incorrectly, please contact lllockapp@gmail.com.

1. Vocabulary & grammar data

Some of the English-language word lists shipped with the LLLock app, and the level tags (A1–C2) attached to them, are derived from the following datasets. We adapted, edited, and translated them into other target languages. We do not claim authorship of the original English entries or of the CEFR-J level assignments.

Terms of the source datasets: free for research and commercial use with proper citation. Copyright is held by Tono Laboratory at TUFS. The original maintainers state: "Neither CEFR-J nor Open Language Profiles is responsible or liable for any inaccuracies in the dataset or any damage resulting from using the dataset."

2. Open-source software (this website)

The marketing site at lllock.app is built with the following open-source packages. Each is used under its respective license — most are MIT.

• Tailwind CSS — MIT — tailwindcss.com
• Material Design Icons — Apache License 2.0 — pictogrammers.com/library/mdi
• Feather Icons — MIT — feathericons.com
• animate.css — MIT — animate.style
• wow.js — MIT — wowjs.uk
• tiny-slider — MIT — github.com/ganlanyuan/tiny-slider
• Tobii — MIT — github.com/rqrauhvmra/tobii
• Twemoji — Source code: MIT; graphics: CC-BY 4.0 by Twitter, Inc. and other contributors — github.com/twitter/twemoji

3. Fonts

• Manrope by Mikhail Sharanda — SIL Open Font License 1.1 — fonts.google.com/specimen/Manrope

4. Third-party services in the app

The LLLock Android app integrates the following third-party services. See the Privacy Policy for what data is processed by each.

• Google Play Billing — subscription processing (Google LLC).
• Adapty SDK — subscription management layer (Adapty.io Inc.).
• Cloudflare, Inc. — hosts our Workers (the AI worker lllock-ai-worker and a support/feedback worker), the KV store used for the daily limit, and the hosting of lllock.app and our app media.
• OpenAI API — AI flashcard generation, when you use that feature (OpenAI, L.L.C.).
• Resend, Inc. — delivery of emails sent via the in-app support/feedback form to our inbox.

5. Notice

The credits above are the ones we are aware of as of the date at the top of this page. Open-source dependencies can change between releases. If you spot a missing attribution, write to lllockapp@gmail.com and we will add it.