Duolisan terms of sale

Last updated: 9 October 2026

Who sells Duolisan Plus

Duolisan and Duolisan Plus are sold by HALALHQ PTY LTD (ACN 690 594 560, ABN 19 690 594 560), trading as Taqwanology, Victoria, Australia. Google does not sell Duolisan Plus. Contact: founder@taqwanology.com.

What is free and what is paid

The Duolisan extension is free. Free use includes vowels on 15 minutes of new video a day, 10 word cards a day and 3 line explanations a day; video that another learner already had vowelled does not count. Duolisan Plus removes these daily limits, subject to fair use: up to about 4 hours of new video, 500 word cards and 200 line explanations a day. Free use on one internet connection is shared up to three times these amounts, so reinstalling does not reset it. Everything that runs on your own computer (subtitles, listen and repeat, saved words, practice, Anki export) stays free.

Prices and renewal

• US$4.99 a month, US$39 a year, or Family at US$69 a year (up to 5 computers).
• Founding price: US$29 a year for yearly subscriptions started before 1 January 2027. It stays at US$29 while that subscription stays active. If it ends and you subscribe again, the price then applies.
• Any tax that applies where you live is shown at checkout before you pay.
• Subscriptions renew automatically at the end of each month or year until you cancel. If we change a price, we tell you at least 30 days before your next renewal, and you can cancel before it applies.
• Payment is handled by Stripe on its own secure page. We never see or store your card number.

Cancelling

Cancel any time with "Manage or cancel" in the Duolisan toolbar button, or by emailing us. Plus stays on until the end of the period you have paid for, then your computer returns to the free limits. Your saved words and lines are not affected.

Refunds

If Plus is not for you, email founder@taqwanology.com within 14 days of your first payment and we will refund that payment in full, no reason needed. We reply within 2 business days. After 14 days, payments are not refunded except where the law requires.

Nothing in these terms excludes, restricts or modifies any right or remedy you have under the Australian Consumer Law or any other law that cannot be excluded.

More than one computer

One Plus subscription covers up to three computers of the same person (Family: up to five computers in one household or study circle), using the code shown after payment.

What Duolisan can and cannot do

Vowels, meanings and explanations are machine-generated by AI (Anthropic's Claude) and can be wrong. Lines the AI is unsure about carry a warning sign. Duolisan is a study aid, not a reference. It works only on YouTube videos that have Arabic captions, and it depends on YouTube, Stripe, Cloudflare and Anthropic staying available. If the service is unavailable for a long period, email us and we will refund the unused part of your period.

Fair use and misuse

Plus is for one learner (Family: one household or study circle). We may suspend a code that is shared beyond its computers or used to run automated requests, after telling you by email where we can.

Law

These terms are governed by the laws of Victoria, Australia.