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Competitor Website Change Monitor

An agent checks competitor pages weekly and explains what changed.

Intermediate14h1–2 people16/20 fit
TL;DR

Build Competitor Website Change Monitor for startup founders and marketers in ~14h with 1–2 people. Stack: Playwright + LLM + Cron + SQLite.

Why it wins: Useful for every startup and easy to show.

Build flow

01 · Problem
Founders miss competitor pricing and feature changes until customers mention them.
02 · Solution
A scheduled agent snapshots pages, diffs the text, and has an LLM summarise meaningful changes such as price or plan updates.
03 · Build
  1. 1Snapshot pages with Playwright
  2. 2Diff cleaned text
  3. 3Summarise with the LLM
  4. 4Email a weekly digest
04 · Demo
Show a pricing page diff with the agent's one-line summary.

MVP checklist

  • Page snapshots
  • Meaningful diff summary
  • Weekly digest
  • Change history

Tech stack

TechRole
PlaywrightBrowser automation
LLMLanguage model
CronScheduled jobs
SQLiteEmbedded database

Reference repos

Open-source projects you can build on. Links checked 2026-10-31.

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