Sider is a sidebar. Dowser is hands. Which one do you need?
2 September 2026 · 5 min read · by Akhil Gorantala
Sider is one of the most installed AI extensions on the Chrome Web Store, and people searching for a "Sider alternative" often land on tools like Dowser. Half the time that is a mistake, because the two solve different problems. Here is the honest sorting.
What Sider is for
Sider docks a chat sidebar onto every page and lets you talk to several models at once: summarize this article, translate this PDF, rewrite this draft, compare answers from GPT, Claude and Gemini side by side. It is an excellent reading and writing companion. What it does not do is operate the page. Sider talks about the page; nothing clicks.
What Dowser is for
Dowser gives the AI assistant you already use, Claude Code, Cursor, Codex, Gemini CLI or any MCP client, actual hands in your browser. You say "cancel this subscription" or "add the blue one in medium to my cart" and the assistant finds the real buttons and presses them, with a visible cursor, in your own logged-in browser. Element finding runs locally in a few milliseconds, with no screenshots and no page content sent anywhere.
The test: which sentence sounds like you?
- "I want AI to help me read and write while I browse." That is Sider, and Dowser is not an alternative to it.
- "I want AI to do things on pages for me: fill forms, click through flows, check out, unsubscribe." That is Dowser, and a sidebar cannot get you there.
Feature by feature
| What you want | Sider | Dowser |
|---|---|---|
| Summarize or translate the page you are reading | Yes, its core job | No |
| Chat with several models side by side | Yes | No, it has no chat of its own |
| Click, type and fill forms on pages | No | Yes, its core job |
| Driven by your existing assistant (Claude Code, Cursor, Codex) | No, its own sidebar | Yes, over MCP |
| Page content stays on your machine | No, processed via its cloud | Yes |
| Pricing model | Monthly subscription | $29 once, 5-day trial |
The cost math over a year
Sider's paid tiers are a monthly subscription because it resells model access; that is fair for what it does, and the price moves with their model costs. Dowser deliberately is not a subscription: it uses the assistant you already pay for (or the free tiers of Claude, Gemini and friends) and charges $29 once for the hands. Over a year the difference is not subtle, but the real comparison is what you are paying for: Sider sells you more model access, Dowser sells you the ability to act. If you need both, buying both still usually costs less per year than one heavy subscription.
They stack, actually
There is no conflict in running both: Sider for comprehension, Dowser for action. The overlap is only in the subscription math. Sider is a monthly subscription for model access; Dowser is $29 once and uses the assistant subscription you already pay for, so it adds hands without adding another monthly bill.
Where each falls short
- Sider will not click, type or navigate for you, on any plan.
- Dowser will not summarize an article in a sidebar; it has no chat interface of its own, by design.
- Sider processes content through its cloud; Dowser keeps page content on your machine.
- Dowser needs an MCP assistant; if you use none, Sider's built-in chat is simpler to start with.
Questions people ask
Can Dowser summarize a page like Sider? Indirectly: your assistant can call dowser_read to pull the page's text and then summarize it itself. What Dowser does not have is Sider's on-page sidebar or its multi-model chat.
Does Sider have any automation at all? It automates reading and writing tasks (summaries, translations, rewrites) but does not click, fill or navigate pages for you.
Do I need a paid assistant for Dowser? No. Any MCP-capable assistant works, including the free tiers of Claude, Gemini CLI and Codex.
If it is hands you were actually searching for, the homepage shows a real run, timed in milliseconds, and the 5-day trial needs no card.
If it was hands you were searching for, Dowser adds them to the assistant you already use: 5 free days, then $29 once, no subscription. Get Dowser.