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A Japanese freelancer scratched his own invoicing itch in PHP, gave it away free until 10,000 people used it, then switched on ¥980–¥3,000 plans and collected ¥100K–¥120K a month for years before selling the whole thing
~10,000 free registered users before monetizing · plans ¥980–¥3,000/mo · ~¥980/mo VPS cost · exited by business transfer (price not disclosed)
This idea is members-only — full breakdown, revenue receipts, playbook, and build prompts.
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