Displays two subtitle lines at once: the original language above and Persian below, for YouTube links or local files. 4LINB LLC builds this Android education-reference app to help Persian speakers follow foreign-language videos. Key functions include speech-to-text translation, a built-in player for MP4 and MKV, and adjustable subtitle size and color. It suits learners and families who prefer reading Persian while watching international content for comprehension and incidental language exposure.

What the app actually does for learners

Persian Subtitle: Dual Subs shows two synchronized subtitle lines so viewers can compare the original wording with a Persian translation in real time. The app accepts YouTube links via sharing or pasting, and it plays local MP4 and MKV files in its own player. These capabilities let a learner pause, reread, and follow dialogue while staying on the same video timeline.

How the display and speech features support language learning

The tool converts spoken audio into text when no subtitle file exists, then translates that text into Persian, which creates on-the-fly captions for unfamiliar clips. Learners can toggle either subtitle line and adjust text size, position, and color, so they can tailor readability during listening practice and compare lexical choices between languages as they watch.

Who can use it and how accessible it is

The app targets Persian speakers studying English, German, French, or Turkish and is optimized for Android 10 and later; it is also available on iOS and iPadOS. No account is required to start using the core features, which reduces setup friction for individual learners and family members who want immediate access on a mobile device.

Content control, customization, and privacy considerations

The app supports manual control over subtitle visibility and visual styling, which helps learners create a consistent reading environment for repeated viewings. It emphasizes privacy by not demanding an account for basic use. Integration with YouTube relies on link sharing or pasting rather than an embedded search, so content selection happens outside the app.

A focused tool for Persian-speaking learners who study by watching media

Persian Subtitle: Dual Subs is a practical mobile aid for individual learners and informal family use who learn from films and videos; it reduces setup steps by not requiring an account. Consider whether the listed source languages match your study needs and expect to share or paste YouTube links rather than browse inside the app before committing to regular use.