Sider review
Updated October 17, 2026 · ForgeCue Editorial Team
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Our verdict
Sider trades a separate app for a browser sidebar that stays beside open tabs during research. It is an AI sidebar and agent that summarizes content, takes notes, generates reports and chats with well known models, built for small teams turning reading into drafts.
Key facts
- Best for
- Small teams turning online reading into drafts
- Free plan
- Yes (Source, checked October 1, 2026)
- Tool type
- Chatbot (Source, checked October 17, 2026)
- Legal entity
- Vidline Inc. (Source, checked October 17, 2026)
- Support channels
- Email, Help-centre, Community (Source, checked October 1, 2026)
- Official website
- sider.ai
Pros and cons
Pros
- Summarizes web content and videos into usable research notes
- Answers questions about visible content with follow up support
- Translates languages and explains complex ideas in plain terms
- Generates reports and captures notes inside the sidebar
Cons
- Work stays inside browser tabs, limiting use away from the web
- Relies on outside models, so results depend on connected systems
Who it suits
- Small teams doing fast online research
- Staff turning articles and videos into reports
Who should look elsewhere
- Teams doing mostly offline work
What it does well
Sider keeps research help beside open tabs. You can summarize long articles and videos, ask questions tied to visible content, and request clearer explanations of difficult ideas. It also translates languages, captures notes, and turns findings into reports for later use. Chat support handles follow up questions, so you can refine a summary or dig deeper without switching tools. For small operations comparing options, that close link between reading and writing cuts copying between windows and keeps drafts moving forward.
Who operates it
Sider is operated by Vidline Inc. Its product line is built around smart writing and summary tools meant to lift personal output, covering content creation and media summaries. The tools reach people through a web application, a browser extension, mobile applications and desktop applications, so one set of features can be used across several devices. Summaries of media and generated content sit at the core of the offering.
Our full take
Sider is an AI sidebar and agent for the browser. Sider Chat lets users ask about any page using GPT, Claude or Gemini, summarizing videos, translating languages, explaining ideas and answering follow-ups.
How Sider compares
- 9.4 vs 9.3
- 9.4 vs 9.1
9.4 vs 8.7- 9.4 vs 9.2
- 9.4 vs 9.3
9.4 vs 9.4
9.4 vs 8.5- 9.4 vs 9.2
- 9.4 vs 8.7
- 9.4 vs 8.0
- 9.4 vs 9.5
9.4 vs 9.4
9.4 vs 9.4- 9.4 vs 9.3
9.4 vs 9.1
9.4 vs 9.1
9.4 vs 9.1- 9.4 vs 9.0
9.4 vs 9.0- 9.4 vs 8.9
9.4 vs 8.9
9.4 vs 8.8- 9.4 vs 8.7
9.4 vs 8.5
9.4 vs 8.5
9.4 vs 8.5
9.4 vs 8.5
9.4 vs 8.5
9.4 vs 8.0
9.4 vs 8.0
9.4 vs 8.0
Frequently asked questions
What does Sider do?+
Sider is a browser sidebar and agent that supports faster research. It summarizes articles and videos, captures notes, generates reports, and chats with well known AI models. You read and draft in one place instead of juggling separate tools.
How does Sider Chat work?+
Sider Chat answers questions tied to visible content in an open tab. It summarizes videos, translates languages, explains ideas, and responds to follow up prompts. You can keep asking until a summary or explanation reads clearly for your task.
Where does Sider work?+
Sider works as a sidebar inside the browser beside open tabs. It brings summaries, notes, and chat help next to articles and videos you review. You stay in the same window while you research, ask, and write.
Which types of work suit the sidebar most?+
Reading long articles, watching videos and turning findings into notes are the typical tasks. People who move between several open tabs get a steady benefit, since the sidebar stays in place while they read. The same panel can also draft a report or translate a passage without leaving the window.
Which company operates Sider?+
Sider is operated by Vidline Inc.. (Source, checked October 17, 2026)
How can I contact Sider support?+
Sider offers support through Email, Help-centre, Community. (Source, checked October 1, 2026)
Sources
- sider.ai checked October 17, 2026
Backs: Tool type, Support channels
“Ask Sider Chat about any page using GPT, Claude, or Gemini.”
- sider.ai/policies/terms checked October 17, 2026
Backs: Legal entity
“Welcome to Sider, operated by Vidline Inc.”
- sider.ai checked October 5, 2026
Backs: Description
- sider.ai/en/help-center checked October 1, 2026
Backs: Free plan
“How many Credits do free users currently have?”
Compiled from 4 source pages, checked October 17, 2026. We did not open an account.
Not confirmed yet: Price from, Usage limits.