Dual Subtitles on Phone & Tablet: YouTube, Netflix, iPad

Every guide to dual subtitles tells you to install a browser extension. Then you pick up your phone, go looking for that extension, and it isn't there — not in Chrome for iPhone, not in Chrome for Android, not in the Netflix or YouTube apps. Most guides simply stop at that point, or quietly imply it works on mobile when it doesn't.

So here is the honest version: what actually gives you two subtitle lines at once on a phone or tablet in 2026, what doesn't, and why. Some of it is good news, and one part of it isn't.

The short answer

If you only remember one line: on mobile, YouTube is solvable and Netflix is not. Anyone telling you otherwise about Netflix on a phone is selling something.

Reading this on a phone or iPad? Get the free app for iPhone and iPad →

On a computer? Get the free browser extension → — that one also covers Netflix.

Why browser extensions don't work on your phone

Dual subtitles on a computer are added by a browser extension. The extension reads the subtitle tracks the site already loads, then draws a second line under the first. That requires the browser to run third-party extension code, and to let it reach into the video player's page.

On mobile that breaks down in three separate ways:

• Chrome and Edge don't support extensions on iOS or Android. This is a platform decision, not a missing feature you can enable. The mobile builds simply have no extension engine.
• The Netflix and YouTube apps aren't browsers at all. They're native apps with their own players. There is no page for an extension to attach to, and no supported way for another app to draw inside them.
• Mobile sites are locked down further. Even if you open netflix.com in mobile Safari or Chrome and request the desktop site, the mobile player doesn't expose subtitle tracks the way the desktop site does.

Two exceptions are worth knowing about, because they're real:

Safari on iPhone and iPad does support extensions (iOS and iPadOS 15 and later, installed from the App Store). The extension format is Safari's own, so Chrome extensions can't be ported over by simply installing them — a developer has to build and ship a separate Safari version. Most dual-subtitle tools, including ours, haven't.

Firefox for Android runs a limited set of add-ons. A handful of subtitle translators are available there. In practice this is the one route to something extension-like on Android, but you're restricted to whatever has been approved for the mobile add-on list, and YouTube in Firefox for Android is a rougher experience than the app.

YouTube on iPhone and iPad: what works

Since the extension route is closed, the working answer on mobile is a dedicated app that plays YouTube inside itself and draws both subtitle lines over the player.

That's what the Linglass iOS app does. You search or paste a YouTube link, the video plays inside the app, and you get the original subtitle line with your native-language line underneath — the same two-line setup as the desktop extension. Tapping a word gives you its translation in the context of that sentence, and saved words go into a review deck you keep across your devices.

A few honest notes:

• It's iPhone and iPad only right now. There is no Android version yet.
• It covers YouTube, not Netflix. See the next section for why.
• Videos with no subtitles of their own still work — the app can generate them, the same way the extension does for caption-less videos.

If you already use Linglass on a computer, the same account carries your languages, saved words and review progress over, so a video you start on a laptop and a word you save on a phone end up in one place.

Netflix on a phone: the honest answer

There is no working way to get dual subtitles on Netflix on a phone or tablet today. Not through an app, not through mobile Safari, not by requesting the desktop site.

The reason is structural rather than stubborn. Netflix's mobile apps play DRM-protected video and hand the player exactly one subtitle track at a time; nothing outside the app can read the second one or draw over the video. And Netflix's own mobile site doesn't load subtitle tracks in a form that anything else can reach. On a desktop browser the picture is completely different — the tracks are there, which is why dual subtitles on Netflix work fine on a computer.

So the realistic options for Netflix are:

1. Watch on a laptop or desktop with the extension. This is the only setup that genuinely works.
2. Connect the laptop to a bigger screen by HDMI if the point was the screen size rather than the device. Casting from a phone won't carry the second line, because the second line is drawn by the browser you're not using.
3. Use the phone for YouTube instead, where the problem is solved, and keep Netflix for when you're at a computer.

We'd rather say this plainly than pretend otherwise. If Netflix ever exposes subtitle tracks on mobile, this section is the first thing we'll rewrite.

iPad specifically

The iPad is worth separating out, because it's the device people most often assume will behave like a computer — and it half does.

Safari on iPadOS can request the desktop version of a site and will run Safari extensions, so an iPad is genuinely closer to a laptop than an iPhone is. What it still can't do is run Chrome or Edge extensions, which is what almost every dual-subtitle tool ships. For YouTube, the app route above works well on an iPad and takes advantage of the bigger screen. For Netflix, the iPad is in the same position as any other tablet: no second subtitle line.

What about a smart TV?

Same answer as Netflix on mobile, for the same reason: the TV app is a closed player, and there's no layer to draw a second subtitle line into. The workaround people actually use is to run a laptop with the extension and connect it to the TV over HDMI, which turns the TV into a monitor and keeps the browser — and therefore both subtitle lines — in play. Casting a tab or mirroring a phone doesn't reliably carry the overlay.

Getting started on your phone

1. Install the Linglass iOS app on your iPhone or iPad.
2. Sign in, or create a free account, and pick two languages: the one you're learning and your native one.
3. Open any YouTube video in the app. Both subtitle lines appear over the player.
4. Tap any word you don't know to see it translated in context, and save it if you want it back later.

If you also watch on a computer, install the extension with the same account — that covers Netflix as well, and everything you save syncs between the two.

Frequently asked questions

Can I get dual subtitles on the YouTube mobile app?

Not inside YouTube's own app — it shows one subtitle track at a time and doesn't allow other apps to draw over it. You need an app that plays the video itself, like Linglass on iPhone and iPad, which shows both lines over the player.

Can I get dual subtitles on Netflix on my iPhone or iPad?

No. Netflix's mobile apps play DRM-protected video and expose a single subtitle track, and the mobile site doesn't load the tracks in a reachable form. Dual subtitles on Netflix work on a desktop browser with an extension, not on a phone or tablet.

Why isn't there a Chrome extension for Android?

Chrome for Android has no extension engine at all — it's a platform limitation rather than a setting. Firefox for Android supports a limited approved list of add-ons, which is the only extension-like route on Android today.

Does requesting the desktop site help?

Not for subtitles. Requesting the desktop site changes the layout the server sends, but it doesn't give the browser an extension engine, and the mobile player still doesn't hand over the second subtitle track.

Is there an Android app for dual subtitles on YouTube?

Linglass is iPhone and iPad only for now. On Android the practical options are Firefox for Android with a subtitle add-on, or watching on a computer.

Do my saved words sync between my phone and my computer?

Yes. Words you save on either device land in the same review deck, and your language settings carry across, so you can start a video on a laptop and continue on a phone.