InterSub records 71,644 monthly visits with -11.2% month-over-month growth and Freemium, Free Trial pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.
Learn languages with dual subtitles and a hover dictionary in any video
AI sidebar and browser agent for reading, writing and research
| Dimension / Metric | ||
|---|---|---|
| Official Domain | intersub.cc | sider.ai |
| Pricing Model | Freemium, Free Trial | Freemium |
| Monthly Visits | 71.64K (71,644) | 2.64M (2,644,740) |
| MoM Traffic Delta | -9.04K (-11.2%) | -314.2K (-10.6%) |
| Primary Market & Share | 🇺🇸 United States (15.2%) | 🇺🇸 United States (13.3%) |
| Direct Visits / mo | 31.96K | 1.7M |
| User Rating | 4.2 | 4.5 |
| Supported Platforms | Website | Website |
Learn languages with dual subtitles and a hover dictionary in any video
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 any subtitle word and the video pauses while a pop-up shows an AI-generated definition plus a translation of the surrounding context.
Every word you look up lands in your Wordbook with its original context, so you build a personal list from scenes you actually watched.
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.
AI sidebar and browser agent for reading, writing and research
A persistent panel that reads the page you are on and answers follow-ups with GPT, Claude or Gemini without copying content into another tab.
Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.
Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.
Bilingual AI translation for websites, documents, video and images
Bilingual AI translation for websites, documents, video and images
Learn languages from Netflix, YouTube, and real-world texts with dual subtitles and AI
Learn languages from Netflix, YouTube, and real-world texts with dual subtitles and AI
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.
An AI language learning assistant with bilingual subtitles, immersive translation, and vocabulary practice
An AI language learning assistant with bilingual subtitles, immersive translation, and vocabulary practice
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.
Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.
AI dubbing and bilingual subtitles for any YouTube video
AI dubbing and bilingual subtitles for any YouTube video
