Sider Review

Switching tabs to an AI chat, pasting a page in, and copying the answer back is a lot of friction for something you do all day. Sider is a browser-sidebar assistant built to bring that help onto the page itself.

It chats about whatever you are viewing, automates multi-step tasks across sites, and edits pages in plain words, all by routing to third-party models like GPT, Claude and Gemini. As a sidebar assistant it competes with tools like Monica, sharing the aggregator approach.

This review covers what Sider does in the browser, which users it suits, how its free and paid tiers work, and the honest caveats around its models and surfaces.

Sider, The Browser-Agent Brief

• Sider is a browser sidebar: an AI assistant for chatting, automating and editing any page.
• It uses other models: it routes to GPT, Claude and Gemini rather than running its own.
• It does three jobs: Chat to understand, Hand to automate, and Code to customise pages.
• Mind the surfaces: an AI essay writer and an agent that uses your logged-in sessions.

Sider Browser-Sidebar Facts

An AI Sidebar That Routes To GPT, Claude And Gemini

Sider's purpose is to put an AI assistant in a sidebar that follows you around the web, so help is available on the page instead of in another tab. Its three framed jobs are Chat, Hand and Code.

Chat summarises, translates and explains whatever you are looking at, web pages, PDFs, YouTube videos, and answers follow-ups; Hand is an agent that researches, compares and acts across real websites; and Code edits or restyles a page in plain words and remembers the change.

The important technical point is that Sider does not run its own foundation model: it routes to third-party models (GPT, Claude, Gemini), so it is an aggregator and interface, not an AI maker. Around the core sit research tools, image utilities and translators.

The honest read is that Sider is a polished, genuinely handy browser assistant, with caveats to flag. Because it is a wrapper, you should know it relies on others' models; its Hand agent acts on real sites using your logged-in sessions, which is a privacy and security consideration; it ships an AI Essay Writer and homework-style tools that raise academic-integrity questions; and the operating company is not named on the page we read.

Sider is a slick browser assistant, but it is a wrapper over GPT, Claude and Gemini, its agent uses your logged-in sessions, and its essay-writer surface raises integrity questions.

What Does Sider Do In Your Browser?

Sider pairs an on-page assistant with automation and page editing.

Chat, Automate And Edit Any Page

Chat works on whatever you are viewing, summarising and translating pages, PDFs and videos through your choice of GPT, Claude or Gemini, so the model is a setting rather than something Sider built.

Where an assistant like Genspark centres on an all-in-one workspace, Sider's identity is the sidebar that overlays the page you are already on.

Many Models Behind One Extension

Hand automates multi-step tasks across sites using your logged-in sessions, and Code edits or restyles a page in plain words and keeps the change for next time, which is where the agentic power and the risk both live.

For a broader in-browser toolkit of shortcuts, a tool such as MaxAI is a comparable option; Sider's distinctive mix is Chat, Hand and Code together in one sidebar.

Which Browser Users Sider Fits

Sider suits heavy browser users who want AI help on the page, summarising, translating, explaining, without switching to a separate chat.

It suits people who want to pick between GPT, Claude and Gemini in one place, and who will use the automation and page-editing features rather than just chat.

It fits less well privacy-sensitive users wary of an agent acting through their logged-in sessions, students tempted by the essay writer, and anyone who wants a named, accountable vendor.

It comes down to what you want from a browser assistant and how comfortable you are with its surfaces. If you spend your day in the browser and want model-flexible help plus genuine automation, Sider is one of the more capable sidebars around. If an agent using your logged-in sessions worries you, or you would be tempted to lean on the essay writer in a way that crosses academic lines, those are real reasons to be cautious, and the unnamed operator is worth weighing before trusting it with anything sensitive.

What Sider's Free And Paid Plans Include

Sider uses a freemium model, free to add to your browser, with paid plans and an education plan. We do not publish prices, which change; check the site for current tiers.

The value question is whether having Chat, Hand and Code in one sidebar, across your chosen models, saves enough over a free chat tab to justify a subscription.

The sensible approach is to add the free version, use Chat on real pages, try one Hand automation on a low-risk task, and judge whether the on-page convenience fits how you work before paying. Be deliberate about the Hand agent and your logged-in sessions, keep the essay writer on the right side of academic rules, and treat the unnamed operator as a reason to keep sensitive data out of it.

Trying Sider On One Real Page

Because its power and risk both live on-page, trial Sider on one real page.

1. Add Sider and pick your model (GPT, Claude or Gemini).
2. Use Chat to summarise a long page, PDF or video.
3. Try one Hand automation on a low-risk, non-sensitive task.
4. Use Code to restyle a page and see if the change sticks.
5. Think carefully before letting Hand use logged-in sessions.
6. Keep the essay writer within academic-integrity rules.
7. Avoid sensitive data given the unnamed operator.

Is Sider The Right Browser Companion?

Everyday Browsers Sider Serves

• Heavy browser users
• People wanting model choice (GPT/Claude/Gemini)
• Those who will use automation
• Page-editing and research needs
• Multi-device browser workers

When Sider's Essay Writer Crosses A Line

• Privacy-sensitive users
• Students tempted by the essay writer
• Anyone needing a named vendor
• People wanting their own model
• Those uneasy with logged-in-session agents