AI Summary
5 min readAngus Chang built a website that does exactly one thing: it converts PDF bank statements into Excel spreadsheets. That single-function site now makes $40,000 a month in revenue, and he runs it entirely alone—no employees, no co-founder, no outside funding. The business grew from a personal frustration: after quitting his job, he wanted to analyze his spending across multiple years of bank data, but his bank only provided PDFs. Extracting the transaction data manually was so painful that he wrote code to do it, then realized other people probably had the same problem.
Finding and validating the idea
Chang did not use a formal framework or market research to find the idea. He encountered the problem himself, which he considers the most reliable source of business ideas. "Another way is your colleagues or friends complaining about stuff at work," he adds. But his core principle is that if an MVP takes only a week or two to build, there is no reason to validate before launching. "It's not that much of a risk anyway. So you might as well just build it."
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What you'll learn
- 1 (01:15) **A Simple Website Making $40K/Month** - Host Pat Walls introduces Angus Chang, a solo founder in Hong Kong who built a single-purpose website generating $40K/month with zero employees and no outside funding.
- 2 (02:03) **How He Found the Idea: A Personal Pain Point** - Angus explains the origin story of Bank Statement Converter, which started as a personal tool to analyze his own finances after quitting his job.
- 3 (02:51) **The MVP and Initial Validation** - Angus describes how he quickly built a minimal viable product with a friend and launched it to test demand.
- 4 (03:12) **Framework for Finding Simple Ideas** - Angus shares his approach to discovering micro-SaaS ideas: look for personal pain points or complaints from colleagues, then build the smallest possible version.
- 5 (03:42) **From Local Script to Live Website** - The technical process of turning a personal Kotlin script into a deployed web application with a friend's help.
- 6 (04:17) **The "Angus Method" for Building** - A lean startup approach: make an MVP, launch fast, don't show it to friends and family (they'll lie to you), and build features based on real user feedback.
- 7 (04:49) **The Growth Numbers** - A timeline of Bank Statement Converter's revenue growth from launch to present.
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Guests on this episode
Show Notes
I make $40K/month with this one websiteSharing ideas that make money! ---- Keywords: app store success, online business, passive income, app flipping, bootstrap startup, startup success, digital products
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