Duolisan privacy policy

Last updated: 7 November 2026

Duolisan is a Chrome extension made by HALALHQ PTY LTD (ACN 690 594 560), trading as Taqwanology, Victoria, Australia ("we"). Contact: founder@taqwanology.com.

The short version

• No account or sign-in. No audio or video is collected, and nothing from outside YouTube video pages.
• To add vowels to a subtitle line, we send that line to our server and to Anthropic's Claude AI.
• We keep vowelled lines so the next person watching the same video gets them instantly.
• If you buy Plus, Stripe handles the payment; we keep your email and subscription status, never your card.

What the extension sends to our server

When you study a YouTube video (Arabic captions, or another language with Arabic as the translation) and vowels are on:

• the YouTube video id;
• the Arabic caption lines that need vowels, with a few neighbouring lines for context, as YouTube serves them;
• YouTube's translation of those same moments;
• a random install id, made when you install Duolisan and kept in its local storage. It is not linked to your name, Google account or YouTube account.

When you tap a word or explain a line, it also sends the subtitle line, the word's position and the language pair. When you send feedback (only then), it sends what you chose and typed, your email if you add one, where it happened (video id, minute, the lines on screen), the extension version, your display settings and the install id. When you check or buy Plus, it sends the install id and, for a second computer, the code you type.

Nothing else is sent. Duolisan does not read your YouTube account, history, comments or other pages, and does not download or record audio or video. The dictionary links on a word card open that dictionary's own site with the word, only when you click one.

Who else receives it

• Anthropic (Claude API): receives the caption lines, translation and tapped words, only to write vowels, meanings and explanations. Anthropic's own commercial terms and privacy policy at anthropic.com apply to its handling of API data.
• Cloudflare: our server and database run on Cloudflare, which processes technical request details such as your IP address to deliver them. We never store your IP address itself (see below).
• Stripe (only if you buy Plus): takes your payment on its own page and shares with us your email, a customer id and the subscription's status. We pass Stripe your install id so the purchase reaches the right computer. Stripe's privacy policy at stripe.com applies to the payment.
• Resend (only if you send feedback): delivers your feedback to our inbox by email, including your email if you added one.

Anthropic, Cloudflare, Stripe and Resend may process data outside Australia, including in the United States.

We do not sell your data, use it for advertising, or give it to anyone else except where the law requires.

What we store

• Shared vowelled lines, meanings and line explanations per video. They carry no install id and no personal information.
• Daily counts per install id (new lines, word cards, line explanations), to apply the free limits.
• For free use, the same daily counts per network, keyed by a one-way scrambled code made from your IP address and the date with a secret key. The IP address itself is never stored, the code changes every day, and these counts are deleted after two days.
• Feedback you chose to send.
• For Plus: your email, Stripe customer and subscription ids, the subscription's status, your code, and the install ids using it.
• A log of each vowelling request: the install id, the video id, which lines, how many were new, the cost and the time, to fix faults and improve the vowels. Deleted after 30 days.

On your computer (Chrome local storage): the install id, and the words, word marks and lines you save with their practice schedule. These never leave your computer unless you export them. Your display settings (and your own dictionary link, if you set one) are kept in Chrome's synced storage, so if Chrome sync is on, Google copies them to your other computers signed in to the same Chrome profile.

How long we keep it

The request log is deleted after 30 days and the per-network counts after two days. Shared vowelled lines are kept, as they hold nothing about you. Email us and we will delete what we hold about you: for Plus, from the email you paid with; for feedback, from the email you gave. Free-plan counts are tied only to a random install id we cannot trace to you; uninstalling Duolisan removes that id from your browser.

How we use it

Only to run Duolisan: showing vowelled subtitles, meanings and explanations, applying the free limits and Plus, and answering feedback. We follow the Chrome Web Store User Data Policy, including its Limited Use requirements.

Accuracy

Vowels and explanations are machine-generated and can be wrong. Use Duolisan as a study aid.

Your rights

You can ask what we hold about you, and ask us to correct or delete it, at founder@taqwanology.com. If you are not satisfied with our answer you may complain to the Office of the Australian Information Commissioner (oaic.gov.au).

Children

Duolisan is not directed at children under 13, and we do not knowingly collect their information.

Changes

If we change what we collect, we update this page and its date before the change takes effect.