Korean Company Lookup — Chrome MV3 extension I shipped

Korean Company Lookup

Detect 사업자번호 inline on Korean web pages with 국세청 checksum.

Free tier: core feature, 5-min refresh, local-first, zero telemetry.
Pro tier ( lifetime): 1-min refresh, 30d history, CSV, Telegram webhook.

Get it

• Gumroad: https://coindany.gumroad.com/l/korean-co-lookup
• Polar (subscription/lifetime): https://polar.sh/lazymac
• Privacy: https://api.lazy-mac.com/privacy/korean-co-lookup
• Direct zip: https://api.lazy-mac.com/extensions/korean-co-lookup-v0.4.0.zip

What it does

Detect 사업자번호 inline on Korean web pages with 국세청 checksum. Built by lazymac as part of the Lumen Chrome Extension Factory shipping 2 utilities per day. Local-first, MV3, no analytics.

Built with manifest v3, chrome.storage.local, and one license verification call to api.gumroad.com/v2.