A browser-based audit tool I built end-to-end as a personal proof-of-work: it audits any amazon.de listing for quality, German regulatory compliance (GPSR / LUCID / WEEE), keyword gaps and PPC risk — surfaced as a side-panel overlay on the page itself. Try the interactive demo below — every tab is clickable.
This is the actual SEU Scan side panel as it appears on any amazon.de product page. The audit runs in your browser — no data leaves the page. Click between the four tabs above to see what each module surfaces.
German marketplace compliance is rapidly tightening — GPSR (EU Reg. 2023/988) became enforceable in December 2024, LUCID/VerpackG requirements have grown, WEEE/ElektroG rules now reach more product categories, and EU AI Act obligations are coming for automated recommendation systems. Most existing tools are either pure SEO ("get more keywords") or pure backend-data plays ("connect your Seller Central API"). Neither covers the day-to-day question a seller actually asks on a listing page: is this safe to publish, will it convert, and is my ad spend not bleeding out?
SEU Scan is my personal lab project to learn the whole stack — regulatory text, Chrome Manifest V3, Side Panel API, content scripts, internationalisation, license/tier handling — by shipping something usable end-to-end. It's intentionally a lab tool, not a SaaS business: I learn marketplace operations by building the audit logic from the regulation upward.
Title length + structure, bullet truncation on mobile, A+ content presence, image slot coverage, attribute completeness. Score from 0–100 with category-relative baseline.
Surfaces ranked terms and high-intent gaps not in the listing or back-end search terms. Volume + difficulty + estimated impression-share uplift.
ACoS / TACoS / CTR view with wasted-spend detection and negative-keyword candidates flagged from search-term reports.
GPSR producer info, LUCID/VerpackG registration, WEEE/ElektroG marking, mandatory textile labels, safety warnings — automated detection on listing content.
All findings, labels and messages are translated. Regulatory references stay in the original German for legal traceability.
Core audit free for any listing. Pro adds keyword gap analysis, PPC module, batch scans and trend tracking. 30-day test-Pro available offline.
Modern Chrome extension architecture. Service-worker background, no persistent processes.
Audit results render in Chrome's native side panel — no overlay injection into the page DOM.
DOM extraction + annotation overlay only on amazon.de — strict host_permissions.
Native DE/EN localisation via _locales/. No translation API calls, no data leakage.
Audit runs entirely in the user's browser. No telemetry, no server, no listing data ever leaves the device.
SEU-XXXX-XXXX-XXXX activation works without server contact — keys verified locally.
Pre-launch readiness check. Before publishing a new product, run SEU Scan to confirm the listing meets German compliance (GPSR / LUCID / WEEE), the title and bullets follow mobile-safe structure, and the back-end search terms aren't leaving impression share on the table.
Existing-listing audit. Run it on a live product to catch silent issues: a bullet that's been truncated on mobile, an A+ block that was removed in a rebrand, a wasted-spend pattern in a category that's gone competitive.
Compliance triage. When new regulation hits (e.g., GPSR enforcement window), run a quick check across active listings to find which need producer-info updates or LUCID number reverification.
Learning instrument. Reading the audit on a real listing is faster than reading the regulation. The findings are the regulation, applied.