5 Chrome extensions selling a paid layer on the page already open (2026)

This week's niche: paid layers on the page already open

The shared surface this week is a page the user already has open. Each extension changes one concrete job on that page — pull a design system into an AI chat, mark dead links, grab a clean video frame, run a multi-step agent on a logged-in session, or surface property data the listing portals bury — and puts a paid boundary around the next step.

That cluster leaves openings in design-to-agent handoffs, page-level SEO QA, media still capture, session-aware automation, and country-specific vertical data. Adjacent underserved corners still look thin: page-to-document conversion, niche ATS resume tools below a few thousand users, and speed-reading utilities with early paid wiring.

A caveat first. Public sources did not supply a trustworthy 30-day install growth percentage for this set. Chrome Web Store pages give current user buckets, ratings, update dates, descriptions, and purchase labels. Chrome-Stats shows a one-week user delta for two of the five. Product sites supply numeric prices where they exist. This issue is an early-signal watchlist, not a claim that every pick cleared the usual ≥50% 30-day growth filter or the 5k–200k install band. Broken Link Checker sits at 4,000 users, below the normal floor, and stays in because the founder just flipped a paywall and reported a first paid sale. Retriever AI and Homer read as company or product teams rather than verified solo or duo builders.

N/P means no public 30-day growth percentage. Revenue figures are scenarios, not reported revenue: Web Store users × assumed 1%–5% paid conversion × public price. The band is a simple stress test of whether the visible install base could support a small business after churn, refunds, and inactive installs.

Extension	Web Store users	Freshness signal	30-day growth	Payment signal	Quality signal
UIDrop	5,000	Updated Aug. 14; Chrome-Stats +2,000 / 1 week	N/P	Pro $4 one-time	5.0/5, 6 ratings
Broken Link Checker	4,000	Updated Aug. 18; Chrome-Stats +1,000 / 1 week	N/P	$2.90/mo · $19/yr · $29 lifetime	5.0/5, 20 ratings
Video Screenshot	100,000	Updated Aug. 23	N/P	Premium $2/mo (billed quarterly)	4.2/5, 783 ratings
Retriever AI	10,000	Updated Aug. 24	N/P	Credits from $9.99/mo	4.0/5, 58 ratings
Homer	20,000	Updated Aug. 19	N/P	Freemium + IAP; price undisclosed	4.8/5, 95 ratings

1. UIDrop: sell the design brief the AI never sees

What the listing says. UIDrop — Design System Extractor for AI shows 5,000 users, a 5.0/5 rating from 6 ratings, version 1.6.0, and a Web Store update dated August 14, 2026. The listing marks in-app purchases. It describes one-click extraction of colors, fonts, spacing, components, and related tokens from a live page, then a send path into AI coding tools. Chrome-Stats, as of August 25, 2026, shows the same 5,000 user bucket with a +2,000 one-week change and a 5.00 rating from 5 ratings — a small rating-count conflict with the store header, so the score is kept and the count is not ranked precisely. The publisher email is tudorbuildstools@gmail.com; solo or duo status is an owner signal, not verified headcount. 1 2

On August 24, 2026, the founder posted that the extension crossed 5,000 users, after roughly 59 users on August 5. That is a self-report, not a store growth curve. 3

Browser-only behavior. The extension reads the rendered CSS of the open tab, builds a structured design brief, and can open or paste that brief into an AI assistant with a screenshot. A separate moodboard or Figma file can hold hex values, but it does not sit on the production page the user is staring at or package the live component tokens in one click.

Monetization and MRR scenario. Free use covers snapping a page, reading the design system, and sending it to an AI. Design Merge and advanced Snap Library tools use limited free trials. Pro is a one-time $4 unlock through Polar.sh, with no subscription. A 1%–5% conversion of 5,000 users implies $200–$1,000 one-time revenue, or about $17–$83 monthly-equivalent if that purchase is spread over twelve months. That is a price-times-base scenario, not Polar sales data. 4

Why Chrome, and where the opening is. The browser already holds the live stylesheet and the layout the user wants to reference. A clone does not need every AI destination on day one. The opening is one export path — for example Tailwind tokens, a single coding agent, or Figma variables — plus a clearer library workflow than a $4 kitchen-sink Pro tier.

The two-week reproduction signal is one page snap, one token export format, and one paid library action. Keep extraction local and make the paid step a repeatable merge or export, not another chat wrapper.

2. Broken Link Checker: charge for the second SEO pass on the open tab

What the listing says. Broken Link Checker shows 4,000 users, a 5.0/5 rating from 20 ratings, version 1.03, and a Web Store update dated August 18, 2026. It offers in-app purchases and describes one-click scanning of links on the current page, color-coded status, filters, and CSV export. Chrome-Stats, as of August 25, 2026, shows 4,000 users with a +1,000 one-week change. The developer site is broken-links-checker.com; the store email is hello@broken-links-checker.com. This pick is below the usual 5k floor and is included as a borderline early signal because the paywall and first sale are public and recent. 5 6

Browser-only behavior. The extension runs against the page the SEO or editor already has open, highlights valid, redirected, and broken URLs in place, and exports the result. A full-site crawler is a different product; a web app cannot paint status onto the live DOM of an arbitrary client page without a separate crawl setup.

Monetization and MRR scenario. The product site states three free checks, then paid plans: $2.90 per month, $19 per year (about $1.58 per month), or $29 lifetime. Purchase happens inside the extension after install. At the monthly price, 1%–5% of 4,000 users implies $116–$580 monthly-equivalent revenue. At the annual price the same band is about $63–$316 monthly-equivalent. Lifetime at the same conversion is a $1,160–$5,800 one-time scenario. On August 23, 2026, founder Paul Molianov wrote that the paywall shipped August 17, that 63 people had seen it, and that one U.S. buyer took the $19/year plan — useful proof of a paid path, not a run-rate. 7 8

Why Chrome, and where the opening is. Page-level QA is a browser job because the user is already reviewing the page. The quality gap is honesty about scope: this is not a site crawler. The opening is a role-specific report — agency client PDF, pre-publish checklist, or redirect-chain view — priced above a pure unlimited scan.

The two-week reproduction signal is one open-tab scan, one CSV schema, and one free-check meter. Ship the meter before adding site-wide crawl promises.

3. Video Screenshot: keep basic grabs free, sell the power-user frame

What the listing says. Video Screenshot shows 100,000 users, a 4.2/5 rating from 783 ratings, version 7.0.7, and a Web Store update dated August 23, 2026. The listing marks in-app purchases and describes full-frame stills from YouTube, Netflix, Disney+, Vimeo, Hulu, and other players without controls or page chrome. The developer email is support@videoscreenshot.app (Non-trader). Chrome-Stats lists creation back to 2020-07-02, so this is a mature listing with a recent update, not a 60-day launch. 9 10

Browser-only behavior. A camera control appears on the playing video; one click or shortcut saves the current frame as JPG or PNG, or copies it to the clipboard, without the player UI. A phone screenshot or OS grab still captures controls and letterboxing. The extension has to keep pace when host players change their DOM.

Monetization and MRR scenario. The free tier is unlimited basic screenshots on major services. Premium is $2 per month, billed quarterly, and adds subtitles on select sites, auto-crop for letterboxed content, and the maintainer’s framing that premium users “help the community stay alive.” At 1%–5% of 100,000 users paying $2/mo, the scenario is $2,000–$10,000 monthly-equivalent revenue. Free unlimited basics likely push real conversion toward the low end of any band; the figure is still only users × conversion × price. The site voice reads as a long-running solo freelancing maintainer, which is a tone signal rather than audited headcount. 11

Why Chrome, and where the opening is. DRM and player markup live in the browser tab. A general screen recorder is the wrong competitor; the wedge is a reliable still from a specific professional workflow — subtitle frames for language work, cropped stills for editorial, or one studio’s internal review format.

The two-week reproduction signal is one player family, one clean frame export, and one premium toggle (subtitles or crop). Expect ongoing breakage when the host site ships UI changes.

4. Retriever AI: put the agent on the session the user already opened

What the listing says. Retriever AI: Browser Agent shows 10,000 users, a 4.0/5 rating from 58 ratings, and a Web Store update dated August 24, 2026. It is Featured, describes prompt-driven workflows across open sites, and advertises free use with ads or a bring-your-own LLM key plus 250 starter credits. Category: Workflow & Planning. Publisher: rtrvr.ai. 12

Browser-only behavior. The agent can inspect the current page, use the logged-in session, fill forms, scrape structured data, enrich lists, and return results to Sheets, CSV, or JSON. A hosted web agent without the user’s cookies has to re-authenticate or miss private dashboards. That session access is also the risk surface: permissions, prompt injection on untrusted pages, and accidental actions on live accounts.

Monetization and MRR scenario. Public pricing lists 250 welcome credits, then monthly credit packs at $9.99 (1,000 credits), $29.99 (3,000), $99.99 (10,000), and $499.99 (50,000), with 1 credit = 1¢. Free Mode and bring-your-own model options reduce credit burn. At the $9.99 tier, 1%–5% of 10,000 users implies about $999–$4,995 monthly-equivalent revenue; at $29.99 the same band is about $3,000–$15,000. Credit consumption varies by run, so installs are a weak proxy for paid seats. The marketing site presents team product lines (Rover, Data & Evals) and large-logo social proof — treat this as a company boundary case, not a verified solo or duo extension. 13

Why Chrome, and where the opening is. The durable wedge is a narrow authenticated workflow, not a general browser agent. A two-week clone that tries to match full agent breadth will lose to capital and model access. A clone that wins one job — “export this marketplace table I can already see” or “fill this internal form from a sheet” — can stay small.

The two-week reproduction signal is one logged-in site family, one structured export, and one visible confirmation step before destructive actions. Ship the confirm step before the demo video.

5. Homer: vertical data the listing portals will not foreground

What the listing says. Homer (formerly KoalaData) – Property Search Extension shows 20,000 users, a 4.8/5 rating from 95 ratings, version 1.1.18, and a Web Store update dated August 19, 2026. It offers in-app purchases and describes hidden price guides, auction and campaign history, and agent insights on Australian property marketplaces. Developer email: jack@homerapp.com.au (Non-trader). Chrome-Stats shows 20,000 users and a last update of 2026-08-20. 14 15

Browser-only behavior. On Domain (and related Australian listing flows the product describes), Homer injects guide accuracy, price-guide changes, campaign history, and agent patterns into the listing the buyer is already viewing. A standalone property app can show research, but it loses the moment of decision on the portal page unless the user copies addresses back and forth.

Monetization and MRR scenario. The homepage describes free core workspace features and paid expansion for deeper analysis such as Agent Insights. The public marketing and FAQ pages captured for this issue do not expose a numeric plan price, so users × conversion × price cannot be completed. MRR is unavailable rather than guessed. The same site promotes iOS, Android, and web app surfaces and a “small, dedicated team,” so this is another company / multi-surface product, useful as a vertical pattern rather than a solo template. 16 17

Why Chrome, and where the opening is. Country-specific portals hide or under-present buyer-side history. The browser is the distribution layer onto Domain and realestate.com.au. Cloning Homer’s full data stack is a poor two-week bet. Cloning the pattern — one marketplace, one buried field, one overlay — is realistic: contractor bid history on a local jobs board, clinic wait data on a booking site, or school-zone context on rental listings.

The two-week reproduction signal is one portal, one overlay field, and one free-to-paid insight. Get the overlay trusted before building a mobile app.

What I would prototype in two weeks

Cleanest tiny paid experiment: UIDrop’s shape — free extract, $4 one-time library or merge. Lowest billing complexity if server cost stays near zero.
Cleanest metered freemium: Broken Link Checker — three free runs, then a low annual or lifetime SKU. Below the 5k floor, but the paywall story is current.
Best large-base freemium lesson: Video Screenshot — unlimited basic, $2/mo power features. Maintenance cost against host sites is the real product.
Best “don’t clone the whole agent” lesson: Retriever AI — steal the session-aware workflow idea, not the multi-product company surface.
Best vertical overlay lesson: Homer — one marketplace field buyers cannot see clearly, delivered on the listing page. Price must be public before any revenue math.

The useful evidence is narrow: each extension changes a live page, draws a payment boundary, and leaves a neighboring vertical where a small builder can remove one more friction step than a generic web app.

Method note

Snapshot date for store and analytics pages: August 25, 2026. Web Store update dates in this set run from August 14 to August 24, 2026. User buckets, ratings, update dates, descriptions, purchase labels, and publisher disclosures come from the linked Chrome Web Store listings. One-week user deltas come from the linked Chrome-Stats pages where a delta was visible. Behavior and prices come from the linked first-party pages and, where noted, founder Reddit posts. No 30-day growth percentage is inferred from an update date, a current bucket, or a search snippet. Team branding and a personal publisher email are not treated as proof of solo or duo ownership. Before cloning any of the five, confirm the paid conversion path, the host site’s rules, and whether a readable install curve has appeared since this snapshot.

This channel publishes a fresh watchlist each Tuesday.

References

1
UIDrop Chrome Web Store listing
chromewebstore.google.com
2
UIDrop on Chrome-Stats
chrome-stats.com
3
Founder post on r/chrome_extensions
reddit.com
4
UIDrop product site and Pro pricing
uidrop.site
5
Broken Link Checker Chrome Web Store listing
chromewebstore.google.com
6
Broken Link Checker on Chrome-Stats
chrome-stats.com
7
Broken Link Checker pricing
broken-links-checker.com
8
Founder post on r/SideProject
reddit.com
9
Video Screenshot Chrome Web Store listing
chromewebstore.google.com
10
Video Screenshot on Chrome-Stats
chrome-stats.com
11
Video Screenshot pricing
videoscreenshot.app
12
Retriever AI Chrome Web Store listing
chromewebstore.google.com
13
rtrvr.ai pricing
rtrvr.ai
14
Homer Chrome Web Store listing
chromewebstore.google.com
15
Homer on Chrome-Stats
chrome-stats.com
16
Homer product site
homerapp.com.au
17
Homer FAQ
homerapp.com.au