Attributions & Trademark Notice

Unaffiliated status

YoluBand is an independent language-learning product. It is not affiliated with, endorsed by, or sponsored by the British Council, IDP: IELTS Australia, Cambridge Assessment English, ETS, the College Board, or any other examination authority. "IELTS", "TOEFL", and "SAT" are registered trademarks of their respective owners and are referenced in our product solely to describe the exam formats that some of our practice features are designed around.

All practice content in YoluBand is written by our team or generated by AI in publicly-known exam formats, and is not drawn from official examinations or official preparation materials. We track the provenance of that content internally — which source it came from, which prompt produced it, and who reviewed it — so the origin of any item can be traced.

External sources we reference

The references below describe the external resources YoluBand draws on. They are grouped by how the resource is used. Passages and cards that are derived from a specific attribution-required source carry an inline attribution line beneath the content itself.

Topic discovery (RSS, titles only)

YoluBand periodically reads the public RSS feeds of the following sites to discover trending English-language exam-prep topics. Only the article titles are used, as topic seeds for our content generator. No third-party article text, excerpt, or passage is stored in our database or passed to the generator.

• IELTS Liz blog (ieltsliz.com): RSS, titles only.
• British Council IELTS blog (britishcouncil.org/exam/ielts): RSS, titles only.
• IDP IELTS resources (idp.com): RSS, titles only.

CEFR alignment

• The Council of Europe's Common European Framework of Reference for Languages (CEFR). Publicly published framework. Used internally to map content (A1 through C2) and to report estimated levels back to learners. No CEFR text is reproduced verbatim in YoluBand.
• Cambridge English Profile, the English Vocabulary Profile. Free CEFR-aligned vocabulary reference. Used as the basis for our internal CEFR-band check that gates AI-generated passages. The bundled seed word list is a hand-curated subset of widely-published CEFR-aligned vocabulary; replacing it with a full English Vocabulary Profile export requires a free Cambridge registration at englishprofile.org

Content sources (planned)

The following sources are approved for use in YoluBand content under the licences shown. Approval is not activation: a planned source is only used once we have verified the licence of the specific item we want, item by item. When a passage or card is derived from one of these, it carries an inline attribution line beneath the content, so you can always see where a text came from.

• Voice of America Learning English (learningenglish.voanews.com): US government public-domain content graded into Beginning, Intermediate, and Advanced levels. Public domain.
• Simple English Wikipedia (simple.wikipedia.org): CC-BY-SA 4.0. When used, the article URL and required attribution string appear in the passage's attribution badge, and anything we derive from it is released under the same share-alike terms.
• Mozilla Common Voice (commonvoice.mozilla.org): CC-0. Used for listening exercise audio. The licence requires no attribution; we acknowledge the source here anyway.
• Project Gutenberg (gutenberg.org): public-domain literature, optionally used for higher-band reading passages. Public-domain status depends on the work and on the country, so we verify it per item and per territory before use.

Lesson audio

The listening and exercise audio in YoluBand is generated with AI text-to-speech voices (Google Cloud Text-to-Speech) rather than recorded by human speakers. Where a recording of a real person ever appears, we say so next to it.

Fonts

YoluBand's interface uses the Golos Text, Rubik, Literata, and JetBrains Mono typefaces, and our tooling uses Noto Sans. All of them are licensed under the SIL Open Font License 1.1. We also ship three small self-built font subsets (golos-text-schwa, rubik-schwa, and golos-text-gbreve) that adapt Golos Text and Rubik for the Azerbaijani letters ə and ğ; they are modified versions of those OFL fonts, redistributed under the same licence, with the licence texts included alongside the font files.

Open-source software

YoluBand is built on open-source software. The libraries below ship to your browser as part of the app; each remains under its own licence, and we thank their authors. This is the notable set rather than the whole of it: a generated file listing every package we ship, with the full text of its licence, is linked underneath.

• React (MIT)
• Next.js (MIT)
• Tailwind CSS (MIT)
• next-intl (MIT)
• Framer Motion (MIT)
• Lucide (ISC)
• KaTeX (MIT)
• Sonner (MIT)
• qrcode (MIT)
• PostHog JS (MIT)

See the full licence text of every package we ship in third-party-notices.txt.

Reporting an issue

If you believe content in YoluBand improperly uses material you own or represent, contact us at hello@yoluband.az with the URL of the page in question and a description of the issue. We will respond promptly.