Developer builds free tracker showing Udemy course price history

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Udemy course prices change frequently, and the platform does not display price history, so a course can cost far less days later. A developer started recording each course's real anonymous-visitor price every morning and built CourseLens, a free site with price charts, a sitewide sale indicator, and per-course RSS alerts for price drops. The site runs on GitHub Actions, Python, and Cloudflare Pages with no server or database, with price history stored as JSON in a Git repository. The author describes two bugs that showed incorrect prices for weeks: a regional edition received dollar amounts from US-based runners and displayed them in local currency, and another edition skipped refreshes based on the other market's sale events. Both were fixed by setting currency explicitly and refreshing every course daily.

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