Marketplace rank tracker
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Vryse · 2026

Weekly ranks from a shadow-DOM marketplace.

Tracks where a product ranks for its keywords in an app marketplace built as a shadow-DOM single-page app, and emails the week’s changes.

Every check ends found, absent or failed — failed checks write no history, so a timeout never shows up as a rank drop. Runs are idempotent, Chrome recycles tabs to stay inside memory, and an out-of-memory kill moves the job to a bigger machine automatically.

How it works
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weekly cron → headless Chrome (2 tabs) → walk shadow DOM → match listing (id, then name) → [found | absent | failed (no history)] → rank history (52 weeks) → change email

Outcomes
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- 3  outcomes per check, so failures never read as drops
- 52  weeks of rank history per keyword

Stack: Trigger.dev, Puppeteer, Firestore, Resend

https://godnik.in/projects/rank-tracker