These are the seven AI Chrome extensions that live in my browser permanently. No filler picks, no affiliate bait — just the tools I actually open every single day.
Why I Stopped Chasing Every New Extension
I used to install every AI Chrome extension the moment it showed up on Product Hunt. At one point I had nineteen of them running simultaneously. My browser crawled. Half of them did the same thing. Three of them were literally the same GPT wrapper with different logos.
So I did something drastic. I wiped every extension, opened a fresh Chrome profile, and spent three months adding things back one at a time. The rule was simple: if I did not reach for it at least once a day for two straight weeks, it got removed. Seven survived. These are those seven.
I am not going to rank them because they serve completely different purposes. Instead, I have grouped them by how they fit into my actual workflow: the daily drivers, the specialists, and the one that handles everything else.
The Daily Drivers That Never Get Turned Off
Number one on my list is not flashy. It is called HARPA AI, and it does one thing brilliantly — it lets you chat with any webpage. Reading a long article? “Summarize this in 3 bullets.” Staring at a competitor’s pricing page? “Compare these plans to ours.” I use it maybe 30 times a day without thinking about it.
What sets HARPA apart from the dozens of “chat with page” tools is that it runs a hybrid engine. It connects to ChatGPT, Claude, Gemini, and DeepSeek through web sessions, so you are always getting the best model for the job without paying for separate API keys. The free tier gives you 10 messages a day, which is enough to test whether it clicks with your workflow. If it does, the Basic plan starts at $12 per month and unlocks everything.
HARPA also has a web automation feature that nobody talks about. You can set it to monitor a webpage for changes and alert you. I have it watching three competitor landing pages and a government grants page. When something changes, I get a notification. That alone is worth the subscription.
Sider AI is the second thing I install. Where HARPA excels at talking to individual pages, Sider is the all-in-one sidebar that follows you everywhere. Select any text on any website and a small popup appears with options to explain, rewrite, translate, or ask follow-up questions. It works inside Google Docs, Gmail, PDFs, and even YouTube transcripts.
The reason Sider earned a permanent spot is speed. Most sidebar extensions feel sluggish — you click, wait three seconds, then get a response. Sider streams answers almost instantly. It supports GPT-4, Claude, Gemini, and DeepSeek all within the same interface, and switching between models takes one click. The free tier gives you 30 basic credits daily. The paid plans start at $8.30 per month, and at that price, you get access to every major model without needing separate subscriptions to each one.
The third daily driver is Grammarly. I know, everyone already has Grammarly. But the 2025 version is genuinely different from what it was two years ago. The AI rewrite feature now drafts entire paragraphs from a brief description. I type “apologetic reply to client about missed deadline, professional tone” and get a polished email in seconds. The free tier still covers grammar and spelling. The Pro plan at $12 per month adds the generative features, tone adjustment, and plagiarism detection. For anyone who writes more than a few emails a day, the free version alone justifies the install.
The Specialists I Reach for Weekly
Perplexity replaced Google for about 40 percent of my searches. Not all of them — I still use Google for navigational queries and local results. But for anything that requires synthesis (“what are the current EU regulations on AI training data?”), Perplexity gives me a cited paragraph instead of ten blue links. The Chrome extension adds a keyboard shortcut that lets you search from any tab without opening a new one.
The free version handles most research needs. The Pro plan at $20 per month unlocks multi-model access including GPT-4o and Claude, unlimited queries, and file analysis. What I appreciate most is that Perplexity was flagged as the most privacy-friendly among major AI extensions in a 2025 academic study. In a category where every tool is reading your screen, that matters.
Merlin is the extension I recommend to people who want one tool and nothing else. It bundles research, writing, summarization, YouTube analysis, and document chat into a single package that activates with Ctrl+M on any page. The 26-in-one pitch sounds like marketing fluff, but I have actually used about 15 of those features in real situations.
Where Merlin shines is the “Crafts” feature. You can generate diagrams, flowcharts, and code snippets from a text prompt right inside the sidebar. I used it to create a quick architecture diagram during a call, shared my screen, and nobody knew it was AI-generated on the spot. The “Projects” feature lets you upload documents and links to build a personal knowledge base that the AI references in future conversations. Pricing works out to roughly $19 per month for the full package, which is competitive when you consider it replaces three or four separate tools.
The Quiet One That Ties Everything Together
Web Highlights is the extension I forget to mention when people ask about my setup, which is ironic because I probably use it more than anything except HARPA. It lets you highlight text on any webpage or PDF, add margin notes, tag everything, and then search across all your highlights later.
The AI part is subtle but brilliant. Select a chunk of highlighted text and Web Highlights will summarize it, extract key points, or generate questions from it. The AI runs locally using Chrome’s built-in model, which means it is fast and completely private. Nothing leaves your browser. For anyone doing serious research — academic, competitive, or just heavy reading — this is the extension that turns your browser into a second brain.
Web Highlights has a 4.83-star rating across over 4,000 reviews on the Chrome Web Store. Everything syncs to their web app, so your highlights follow you across devices and are searchable from your phone. The free tier is generous. Most people will never need to upgrade.
You might have noticed Monica in that visual. It is my seventh extension, and I go back and forth on whether it stays. Monica does roughly what Sider does — sidebar chat, page summarization, multi-model access, translation, image generation — but with a slightly different interaction model. Where Sider pops up when you select text, Monica lives as a persistent icon you click to open a full sidebar panel.
The reason Monica stays installed is one specific feature: image generation directly in the sidebar. I use it to quickly mock up visual concepts without leaving whatever page I am on. Monica supports GPT-4o, Claude, and Gemini, and the free tier gives you limited daily access with GPT-3.5. The Pro plan starts at $8.30 per month. With 10 million users, it has clearly found its audience. Whether you need both Sider and Monica depends on whether you value the text-selection popup (Sider) or the persistent sidebar panel (Monica).
| Extension | Best For | Free Tier | Paid Plan | Rating |
|---|---|---|---|---|
| HARPA AI | Page chat, automation | 10 msg/day | From $12/mo | 4.8 |
| Sider | All-in-one sidebar | 30 credits/day | From $8.30/mo | 4.9 |
| Grammarly | Writing, email | Grammar + spelling | $12/mo | 4.7 |
| Perplexity | Research, citations | Unlimited basic | $20/mo | 4.6 |
| Merlin | Multi-tool, diagrams | Limited | ~$19/mo | 4.8 |
| Monica | Sidebar + image gen | Limited daily | From $8.30/mo | 4.8 |
| Web Highlights | Highlight, annotate | Generous free | Optional premium | 4.8 |
▲ If you install all seven, keep HARPA, Sider, and Grammarly active at all times. Toggle the other four on only when you need them. Seven concurrent AI extensions will eat 400-600 MB of RAM, and your battery will notice.
Frequently Asked Questions
Sider. It covers the widest range of daily tasks — summarization, writing, translation, multi-model chat, PDF analysis, and YouTube transcripts — all from a sidebar that works on every website. The free tier gives you 30 credits a day, which is enough to decide if it fits your workflow. If you do heavy research specifically, Perplexity is a close second because the free version is unlimited for basic searches.
Most of them do, because the AI processing happens in the cloud. A 2025 study on AI extension privacy found significant variation across tools. Perplexity was flagged as the most privacy-friendly. Web Highlights runs its AI summarization locally using Chrome’s built-in model, so nothing leaves your browser. For the others, review their permissions carefully before installing — avoid any extension that requests “read and change all your data on all websites” without a clear functional reason.
Grammarly’s free tier handles 90 percent of what most people need. Web Highlights is fully usable without paying. For everything else, the free tiers are demos — enough to test the tool, not enough to rely on daily. If you commit to one paid extension, make it either Sider ($8.30/mo for access to every major AI model) or HARPA ($12/mo for unlimited page chat plus web monitoring). Paying for both Sider and Monica is redundant unless you specifically need Monica’s image generation feature.