Chat beside the open page
The panel opens on the side. You choose the assistant that answers, and the “Read this page” option has it read the open page or YouTube video. You can also attach a file, an image, or a screenshot.
AI tools · Assistants
Sider pricing, use cases, and first steps
Sider is an extension for Chrome and Edge. It opens a panel beside the page you are reading. There you chat with several well-known assistants (GPT, Claude, Gemini, Grok, DeepSeek) and have them read the page, a PDF, or a YouTube video. Sider translates, proofreads, helps you write, and creates images. It is also available on the web, on desktop, and on phone.
Sider has a free plan. The recommended plan to start with: Free, €0. Prices checked on October 3, 2026 on the vendor’s official page.
SiderA side panel in your browser to summarize, translate, and write- Vendor
- Vidline Inc. (United States)
- Free plan
- Yes
- Recommended plan
- Free, €0
- Page checked on
- October 3, 2026
What Sider does
Who it’s for: people who read, search, and write in their browser all day, and who want to compare several assistants without stacking up subscriptions.
Ask several assistants the same question
You mention one or more assistants in the same conversation. Each one answers the same question, and you compare the answers side by side.
Summarize a PDF or a YouTube video
“ChatPDF” summarizes, translates, and answers your questions about a PDF document. On YouTube, Sider offers a summary of the video and captions in two languages.
Also
- Translate a page, an image, or a PDF
- Write, reply, proofread
- An answer beside your search results
- Create and edit images
- Let Sider act in the browser
Sider pricing
The amounts on the site’s pricing page were not legible when we checked: the prices above are those of the French App Store and may differ on the site. All plans give access to all features; what changes is the number of credits. Payments are non-refundable unless stated otherwise. A plan for education exists.
| Plan | Price | Who it’s for |
|---|---|---|
| Free Recommended to start | €0 | Discovering the extension |
| Basic | €9.99 per month (price checked on the French App Store) | Regular use |
| Pro | €22.99 per month (price checked on the French App Store) | Daily use |
| Unlimited | €44.99 per month, or €349.99 per year (prices checked on the French App Store) | Heavy use |
What the free plan includes
A free account lets you try chat, summaries, and translation with a limited number of credits. The vendor did not display this number legibly when we checked.
Nova’s advice
Start for free: summarizing and translating a few pages a day doesn’t require a subscription. If you already pay for ChatGPT, Claude, or Gemini, Sider partly duplicates them. The Basic plan is only worth it if you want several assistants for the price of one.
A first try, in 4 minutes
Your data. US vendor. Sider passes your requests to the vendors of the assistants you choose and reserves the right to use content to improve its product.
What it does less well
- Sider resells access to other companies’ assistants. The versions offered change often, and the most capable ones use more credits.
- The credit system is hard to read: it’s difficult to know in advance what a request, an image, or an automated task costs.
Have Sider read a page and ask it your questionsSider- Open a page that is useful for your work: an article, a product page, a documentation page.
- Click the round Sider icon at the bottom right of the page. The panel opens.
- In “Chat,” click “Read this page”: Sider takes the page as the topic of the conversation.
- Paste the prompt below and submit.
- Ask a second question about a specific point, then check the numbers on the page.
The prompt to copy
Summarize this page in five points. Then tell me what is useful for preparing a customer meeting, and what is missing to make a decision.
Alternatives to Sider
Monica
The closest extension: a side panel, several assistants, summaries, and translation.
Mammouth
Several assistants in a single subscription, from a French vendor.
Comet
A full browser with a built-in assistant, rather than an extension.
ChatPDF
If you only want to ask questions about PDF documents.
DeepL
If your main need is professional translation.
Frequently asked questions about Sider
How much does Sider cost?
Free: €0; Basic: €9.99 per month (price checked on the French App Store); Pro: €22.99 per month (price checked on the French App Store); Unlimited: €44.99 per month, or €349.99 per year (prices checked on the French App Store). Prices checked on October 3, 2026 on the vendor’s official page.
Can you use Sider for free?
Yes. A free account lets you try chat, summaries, and translation with a limited number of credits. The vendor did not display this number legibly when we checked.
What happens to my data with Sider?
US vendor. Sider passes your requests to the vendors of the assistants you choose and reserves the right to use content to improve its product.
What are the alternatives to Sider?
Monica: The closest extension: a side panel, several assistants, summaries, and translation. Mammouth: Several assistants in a single subscription, from a French vendor. Comet: A full browser with a built-in assistant, rather than an extension. ChatPDF: If you only want to ask questions about PDF documents. DeepL: If your main need is professional translation.
Official pages consulted
Page checked on October 3, 2026. Brands are named to identify the tools. No affiliation.