RankLensSee the business
behind any extension.
Open any extension’s store page and RankLens tells you how many people use it, how fast it’s growing, how it charges, what users complain about (where public reviews exist) — and whether its category still has room.
In review on the Chrome and Edge stores. Leave your email — we’ll send one install link on launch day.
- Free basics, no sign-in
- No browsing history
- Every number sourced & dated
Know the business before you decide
Stop flipping through store pages, guessing users and sizing markets by hand.
Indie makers: pick an idea
Size up a niche before you build: who’s in it, how big they are, where users are unhappy.
Small teams: track competitors
Competitors’ growth, pricing changes and complaint trends on one card.
Buyers: do due diligence
Cross-check a seller’s claimed revenue against public users, growth and pricing.
Up and running in 30 seconds
Nothing to do day to day — it appears when you open a store page.
Install
Add it from the Chrome or Edge store, no account needed (in review — get notified at launch).
Open any store page
Any product on the Chrome Web Store, Edge Add-ons or Product Hunt.
Glance, then click
The badge shows recent growth; one click opens the full signal card.
Not just today — how it got here
Right in the side panel, without leaving the store page:
- Users and growth, with history backfilled from web archives
- Pricing plans and rating trend
- Complaint themes: top 3 clusters from public reviews (where reviews are available)
- Revenue range with confidence (where backtests pass)
Is the category worth entering? A verdict in 10 seconds
Type a keyword and get a one-page verdict on the whole category:
- Size, growth, concentration and new entrants
- Price bands and the top 5 user pains
- A 0–100 opportunity score — every factor explains itself
Every number shows its work
Revenue is always a range with its formula: users × category paid rate × price. The model is calibrated on verified-revenue products, and where backtests fail no amount is shown — we’d rather say nothing than guess.
Confidence: medium · every input shows its source and date
Trustworthy data, privacy by design
You’re looking at other businesses — your own browsing stays yours.
Public data only
Store listings, pricing pages, public reviews and web archives.
Public backtests
Backtest results and release thresholds are published.
No browsing history
Active only on store pages and Product Hunt; sends only a product ID.
Start free, upgrade when you need more
Most people never need more than Free.
Free
- Users, growth, rating, pricing: unlimited, no sign-in
- 20 deep views/month when signed in
- 2 category radars/month
Pro
- Unlimited deep views
- 50 category radars/month
- One quota across extension, AI connector and API
FAQ
Didn’t find your answer? Ask us
Where does the data come from?
Public data only: user counts, ratings and versions from store listings (collected daily), the product’s own pricing page, public reviews, and web-archive snapshots for history. RankLens never uses anyone’s browsing data.
How accurate are revenue estimates?
We show ranges, never a falsely precise number. The model is calibrated on products with verified revenue and backtested in public; where a group fails the backtest, no amount is shown. The real calibration set is still growing, so revenue estimates are not yet shown for real products — users, growth, pricing, ratings and complaints are available now.
What do I get for free?
Users, growth, ratings and pricing are unlimited without sign-in. Deep data (full history, complaint details): 3 views anonymously, 20/month signed in; 2 category radars/month. Pro removes the deep-view limit.
What if a product isn’t tracked yet?
Just open its store page: it’s queued automatically and filled in within 24 hours, and we’ll let you know. Coverage grows every day.
Which products have complaint themes?
Only products with a public review source (currently the same product’s public reviews on Firefox Add-ons), shown in the deep view. Without a source or enough reviews the card says “Not enough negative reviews” — nothing is made up.
Which browsers are supported?
Chrome and Microsoft Edge. Brave, Opera, Arc and other Chromium browsers can install from the Chrome Web Store.
Does it read my browsing history?
No. The extension only activates on extension store pages and Product Hunt and only sends the product ID of that page. Recognizing products on their own websites is off by default and matches locally when on. Anonymous usage stats are off by default.
I’m the author and a number is wrong. What now?
Click “Is this data accurate?” on the card or use the feedback page. Author corrections are reviewed first, and authors who share real revenue help calibrate (anonymously) every estimate.
Next time you open a store page, see the business first.
We’ll email you the install link on launch day. Free, no sign-in, ready in 30 seconds.
In review on the Chrome and Edge stores. Leave your email — we’ll send one install link on launch day.