Opportunity brief · Oct 30, 2026

Allow CORS

Easily add (Access-Control-Allow-Origin: *) rule to the response header.

RevenueNo price in the listingNo price listed

OpportunityNot scoredAn opportunity needs a revenue figure of at least $1k a month.

1–2★ ratingsnot publishedcomplaints from Oct 2025–Aug 2026, almost all in the last 24 months

Build difficultyLowSimple browser extension; main work is reliable localhost CORS handling and Chrome Web Store review, no payments or data moat.

The pitch, and what the numbers say

Allow CORS: Access-Control-Allow-Origin — Tools

No revenue figure: see why on the full x-ray.

Why users leave

The free diagnosis shows the top complaint. The full brief has every cluster, the build ideas and the buyers.

Bugs/Reliability · 80% of complaints read

Extension fails on localhost:3000 CORS debugging, is reported not working, and publisher site reportedly shows malware ads.

“malware adds on the publisher website.”

+ 1 more complaint cluster, with verbatim quotes — in the full brief

What a challenger would build

3 build ideas, each answering a complaint above — in the full brief

Closest alternatives

Who is buying right now

10 buyer threads in the same market in the last 30 days, with links and excerpts in the full brief.

Get the full Allow CORS brief

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

How to read this

Sources: the product's public listing and reviews, its published price, and public forum threads. Revenue is an estimate unless marked verified by the founder; the formula and its inputs are on the full x-ray. Complaints are grouped by a language model and each quote is a verbatim excerpt, linked to the original review. Build difficulty is a model's reading of the listing and the complaints, not a measurement. Figures are a snapshot of Oct 30, 2026. Corrections: corrections.

Open the full x-ray →