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Chrome extensionwhat they say

Cubox

Highlighter, Clipper, AI Reader. Read, annotate and take notes with AI assistant.

★★★☆☆2.8 (102) · 20k+ users
Free
Chrome Web Store ↗
what mrrlens sees
MRR · No price listedNo price in the listing
Opportunity—
Buyer threads · 30 d0
“The latest version keeps prompting me to log in when I click Favorite, even though I’m already logged in on the website.”
#1 complaint · Bugs/Reliability · 3 of 4 complaints read · analysed Oct 29, 2026 · source

01Revenue

No price in the listing

Store data from the Chrome Web Store listing, refreshed daily. Updated 22 h ago.

02Why users leave Cubox

Bugs/Reliability3 reviews · 3 of 4

Login state fails: Favorite prompts re-login despite web session; repeated login loops; Chinese site switch blocked existing account access.

“The latest version keeps prompting me to log in when I click Favorite, even though I’m already logged in on the website.” source ↗
1 more complaint, with verbatim quotesIncluded in the day pass and Pro.
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Sample: 4 recent complaints (1–3★ reviews) · clustered Oct 29, 2026 · complaints from Jul 2024–Mar 2026, 50% in the last 24 months · each review labelled by a model, quotes verbatim

03How to build a better Cubox

Build difficultyLowBrowser extension permissions, auth/session reliability, and store review; no payments, hardware, or regulated data.
Three build ideas that answer these complaintsIncluded in the day pass and Pro.
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04Who wants a better Cubox

0 buyer threads in the last 30 days name Cubox, and 14 more are in the same market.

05Questions about Cubox

How much revenue does Cubox make?

Cubox's listing publishes no price and no paid plan, so MRRLens shows no revenue estimate. It may still charge on its own website; a founder can verify the real figure.

What do users complain about most in Cubox?

Across 4 recent complaints, the most common is bugs/reliability (3 of 4). Login state fails: Favorite prompts re-login despite web session; repeated login loops; Chinese site switch blocked existing account access.

What are the best Cubox alternatives?

The closest alternatives MRRLens found are PAGENOTE, Glasp Web Highlighter and WuCai. The full list, with why users leave, is on the Cubox alternatives page.

How many people use Cubox?

Cubox lists 20k+ users on the Chrome Web Store, rated 2.8 (102).

See the full x-ray of Cubox

Full 1-star breakdown with verbatim quotes, the build blueprint and every live thread — on every product.