Solo SaaS FoxyInvoice Runs Two Products for Under $20 a Month

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Developer building FoxyInvoice in public has shared a detailed cost breakdown for running the invoicing platform, revealing total infrastructure expenses of just $10–19 per month. The stack relies on a single low-cost VPS, Cloudflare's free tier for DNS and email routing, and AWS SES for near-zero-cost email sending. No managed database or paid monitoring tools are used, keeping fixed costs minimal while marginal cost per free user remains effectively zero. The unit economics show that just two Pro subscribers at $9 each generate enough net revenue to cover the entire monthly infrastructure bill. The founder notes that reaching 1,000 Pro subscribers would yield roughly $8,400 per month in net revenue, which they describe as the threshold where paid tooling would finally justify its cost.

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