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Sider AI Review (May 2026): The ChatGPT Sidebar Built for Deep Research, Priced for Operators
If you spend half your day pasting URLs into ChatGPT and the other half asking Perplexity to summarize them, Sider is the sidebar that collapses both into one panel. Its Deep Research Agent is the real reason to pay, the unlimited tier sits cleanly under what you would spend on ChatGPT Plus plus Perplexity Pro, and its free tier of 30 daily credits is unusually generous for the category. That is the verdict. The caveat is that Sider's published pricing has drifted enough times in the last twelve months that six different third-party reviews now describe six different tier structures, and a buyer should re-confirm the dashboard before subscribing.
This review walks through what Sider AI actually is, where the Deep Research Agent earns the upgrade, and the pricing-inconsistency finding (the editorial moat for this piece).
What Sider AI actually is
Sider is a browser extension that pins an AI sidebar to every page you load in Chrome or Edge. The Chrome Web Store listing reports 5,000,000 users and a 4.9-star rating across roughly 112,000 reviews, which makes it one of the most-installed AI assistants in any browser store. (Chrome Web Store listing summary, May 2026)
Two products live inside that sidebar:
- A general-purpose chat panel that routes prompts to whichever model you pick (OpenAI, Anthropic, Google, DeepSeek, Grok, and a handful of open-weight options). The store listing names GPT-5.2, Gemini 3 Pro, Claude Sonnet 4.5, Grok 4, and DeepSeek v3.2 among the current model menu. (Chrome Web Store listing, May 2026)
- A Deep Research Agent, which is the differentiator. It runs a multi-step search across the open web, scans more than 100 sources, and returns a cited report. Multiple third-party reviews describe the same workflow, and the reviewer at RoboRhythms says output quality "matches what I'd expect from a dedicated research tool" after months of daily use. (RoboRhythms Sider AI review, 2026)
Everything else (page summary, translation, PDF chat, YouTube transcript extraction, rewriter) is table stakes for the sidebar category. The Deep Research Agent is the thing Monica, Merlin, and the rest of the field do not quite match in 2026.
The two-product story: sidebar chat vs Deep Research Agent
The sidebar chat is what you reach for when you want a one-shot answer about the page you are looking at: summarize this article, translate this product description, rewrite this email more concisely, explain this code block. Sider charges this against a daily credit pool. The free tier gets 30 basic credits per day; a basic-model chat costs one credit; premium-model chats cost more. (Tools For Humans Sider review)
The Deep Research Agent is the longer-form job. You hand it a research prompt ("compile a competitive landscape of AI compliance vendors with three differentiators each") and it runs a multi-step plan, hitting the web, reading sources, and returning a structured report with inline citations. The RoboRhythms review describes "multi-minute generation times" and an extra-credit cost per run, which is consistent with how every multi-agent research tool we have seen prices the workload. (RoboRhythms)
The Deep Research Agent is what makes Sider price-competitive against the bundle of ChatGPT Plus plus Perplexity Pro, because it does the job the second subscription was paying for.
Model coverage
The Chrome Web Store listing is the cleanest model inventory we can verify directly:
- OpenAI: GPT-5.2, GPT-5.1, GPT-5 mini, GPT-image-1.5
- Anthropic: Claude Sonnet 4.5, Opus 4.5, Sonnet 4, the Haiku series
- Google: Gemini 3 Pro, Gemini 3.0 Flash, Gemini 2.5 Pro and Flash
- Others: Grok 4, DeepSeek v3.2, Kimi K2, Nano Banana Pro for image generation
(Chrome Web Store listing, May 2026)
Two things matter here. First, Sider keeps current with model releases faster than most third-party sidebars; GPT-5.2 and Gemini 3 Pro both shipped in the spring 2026 update cycle, and they are already in the menu. Second, model access is gated by credit cost. Basic models (the "mini" and "flash" tiers) are cheap; premium models burn through credits faster, which is the structural reason the unlimited plan exists.
The pricing reality (and why it is the most candid section in this review)
Sider's pricing is the messiest part of this product, and a buyer is going to walk into a different number than the one they expected at least once. Six third-party reviews dated within the last six months describe six tier structures:
| Source | Free | Paid tiers reported |
|---|---|---|
| AI Toolbox review (2026) | 10 queries/day | Pro $20/month, $120/year |
| Tools For Humans listing | 30 basic credits/day | Basic $8.30, Pro $16.60, Unlimited $25 |
| RoboRhythms (annual billing) | 30 credits/day | Starter $4.20, Basic $6.70, Pro $12.40, Unlimited $16.70 |
| FahimAI (annual billing) | 30 credits/day | Starter $4.20, Basic $6.70, Pro $12.40, Unlimited $16.70 |
| AI Chief | (limited free) | Pro $10, Business $20 |
| AI Tools Coop (teams) | 30 credits/day | Basic $70, Plus $210, Ultra $1,399 |
That is six different tier structures published as "current" within the last twelve months. Some of the spread is real product change (Sider has run promotional pricing, raised list prices, and split out a teams tier), some of it is reviewers conflating annual and monthly billing, and some of it is older posts that never got updated. The point is not to pick a winner; the point is that you should open the sider.ai pricing page in your own browser before you check out, because the number on any review (including this one) is going to age within a quarter.
Sider's own pricing page returned an HTTP 403 to our automated fetch (Cloudflare bot wall, expected for any anti-scrape configuration), so we cannot quote it directly here. (sider.ai/pricing is the canonical source; load it in a real browser.) The consistent signal across the third-party reviews is that there is a free tier with 30 daily basic credits, a Pro tier roughly between $12 and $20 per month depending on billing cadence, and an Unlimited tier in the high-teens to mid-twenties per month that grants unlimited basic credits and at least a guaranteed monthly allotment of premium-model credits. Treat that as the shape, not the specific price.
The math that matters: per OpenAI's ChatGPT pricing page, ChatGPT Plus runs $20 per month, and per Perplexity's pricing page, Perplexity Pro is also $20 per month, so the typical research-stack bundle Sider replaces is $40 per month. Sider's Unlimited tier comes in under that bundle on every published price point in the table above. That is the whole pricing case.
The Deep Research Agent in practice
The Deep Research Agent is what justifies the upgrade from the free tier, and the workflow looks like this for the kind of operator this review is written for.
Imagine you are prepping a Friday board update on the AI compliance vendor space. A normal chat with GPT-5 gives you a confident summary that may or may not match what those vendors actually claim about themselves; you have no source list to spot-check. A Deep Research run takes the same prompt, executes a multi-step search across vendor sites, news coverage, and analyst summaries, and returns a structured brief with inline source links. The output reads more like a junior analyst's first draft than a chat response. You still edit it, but you edit from sources, not from a vibe.
The RoboRhythms review describes the same workflow and reports "multi-minute generation times" for a Deep Research run, with a credit cost that is meaningfully higher than a one-shot chat. (RoboRhythms) That is consistent with how Perplexity's Deep Research mode and the new Claude research agents are priced; the agent is doing real work and you are paying for the tokens.
The catch is that Deep Research output quality is heavily prompt-dependent. A vague prompt gets a vague brief. A specific prompt that names the verticals, the differentiators, and the citation requirements gets a usable Friday-morning artifact. The Sider sidebar does not warn you about this; you learn it on the second or third run.
Browser support and where Sider does not run
The Chrome Web Store listing covers Chrome and Edge. Several third-party reviews also mention Safari, iOS, Android, Mac, and Windows clients (FahimAI, Tools For Humans), but the AI Toolbox review explicitly notes "Firefox not supported." (AI Toolbox)
The candid answer for a Firefox user is: do not buy this. The candid answer for an Arc or Brave user is: it works through the Chromium extension and the experience is identical to Chrome. The candid answer for a Safari user is: confirm in the App Store that the Sider build you find there has feature parity with the Chrome extension, because in our experience the Safari builds of these sidebars consistently trail the Chrome ones by a release.
Candid pros and cons
What Sider gets right:
- The Unlimited tier is the cleanest pricing in the category. Monica counts credits in a way that is genuinely hard to plan around; Merlin uses a fair-access cap that throttles power users. Sider's "unlimited basic credits plus a guaranteed monthly bucket of premium-model credits" structure is the easiest to explain to a budget owner.
- The Deep Research Agent is real, not a chatbot wrapper. Reviewers who used it for months report a workflow that meaningfully replaces a Perplexity Pro subscription.
- The free tier is unusually generous. 30 daily basic credits is enough to evaluate the product on real work, not just sandbox prompts. Most competitors give you a sandbox so small you cannot reach a buy decision from it.
- Model coverage is current. GPT-5.2 and Gemini 3 Pro both shipped this spring and are already in the menu, which is faster than most third-party sidebars.
- The Chrome Web Store rating is 4.9 across 112,000 reviews. That is signal, not noise, at this volume. (Chrome Web Store summary)
What Sider gets wrong (or what you should know going in):
- Pricing genuinely changes often. The third-party review spread is not laziness on the reviewers' part; it reflects a product that has run promotions, raised list prices, and added a teams tier in the last twelve months. Confirm the dashboard before you commit to annual billing.
- Chrome and Edge are the only first-class browsers. Firefox is unsupported. (AI Toolbox)
- Deep Research output quality is prompt-dependent. This is true of every agent, but Sider does not coach you toward a good prompt; you figure that out from your first two flat runs.
- Credits do not roll over month to month. A heavy-use month followed by a vacation month is wasted budget. The RoboRhythms review flags this as the single biggest user complaint. (RoboRhythms)
- No SSO, no SCIM, no procurement-grade audit trail surfaced in any third-party review. If you are buying for an enterprise that needs identity management, Sider is the wrong product. Look at vendor-direct ChatGPT Enterprise or Claude for Work instead.
Why you should try Sider
You should try Sider if you are a researcher, analyst, or content operator who currently pays for ChatGPT Plus plus Perplexity Pro (or is about to) and wants the Deep Research workflow inside a single sidebar at a lower combined price. The free tier is generous enough to see whether the Deep Research Agent earns its keep on your real work in a week; the Unlimited tier replaces the two-subscription bundle on every published price point. Start free, run two Deep Research jobs that matter, then decide.
If Sider is not the fit
If Sider does not match the workflow, the realistic alternatives are Monica (broader feature surface at a lower entry price, but credit-counting that is harder to plan), Merlin (Chrome-only too, with a documented fair-access cap), Perplexity Pro (search-first, weaker general chat), or paying ChatGPT, Claude, and Gemini direct. There is no single right answer; the question is which subscription you cancel first.