How do their growth rates compare?

InterSub has a month-over-month growth rate of -11.2%; Viduu has —.

How does pricing compare?

InterSub: Freemium, Free Trial. Free to start with dual subtitles included. The free plan allows a limited number of word lookups each month; Pay-as-you-go and Premium plans add more lookups and unlock AI subtitle translation. Exact prices are listed on the site's plans page. Viduu: Contact for Pricing. Listed on the Chrome Web Store as Contact for Pricing. No tiers or figures are published on the extension page.

What are alternatives to InterSub and Viduu?

Other tools in related categories include Immersive Translate, Language Reactor, Praktika, Trancy, Twee.

InterSub vs Viduu — Traffic (71.64K vs 0), Pricing & Verdict

Open AI Tools

InterSub vs Viduu — Traffic (71.64K vs 0), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	InterSub	Viduu
Official Domain	intersub.cc	chromewebstore.google.com
Pricing Model	Freemium, Free Trial	Contact for Pricing
Monthly Visits	71.64K (71,644)	0 (0)
MoM Traffic Delta	-9.04K (-11.2%)	0 (—)
Primary Market & Share	🇺🇸 United States (15.2%)	🌐 Global (—)
Direct Visits / mo	31.96K	0
User Rating	4.2	1.9
Supported Platforms	Website	Browser Extension

InterSub

Learn languages with dual subtitles and a hover dictionary in any video

Dual subtitles in your two languages

Watch with the subtitle of the language you are learning and your native language stacked, one line above the other, directly inside the video player.

Hover pop-up dictionary

Hover any subtitle word and the video pauses while a pop-up shows an AI-generated definition plus a translation of the surrounding context.

Self-filling vocabulary builder

Every word you look up lands in your Wordbook with its original context, so you build a personal list from scenes you actually watched.

AI subtitle translation

If an episode has no subtitles in your language, InterSub translates them on the fly with AI and shows the translation as the second line.

Strengths & Pros

+Dual subtitles and hover lookups happen inside the player, so you never leave the episode
+Vocabulary is captured automatically with the sentence it came from
+Supports dozens of language pairs across streaming, learning, and anime platforms
+Extra study tools like pause-only subtitles, shadowing mode, a Telegram bot, and Anki sync