chuan's profile on Product Hunt

About

Indie developer building useful tools. CompactJPG , CampPowerCalc , UnTrackedTools , ClarifyPix , RoomPaintCalc , FryCalc , ColdPlungeCalc ,TaxEd Abroad

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Tastemaker

Gone streaking

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Maker History

AI Cite WhoSee who AI recommends. Turn evidence into action.
Oct 2026
InvoiceFormlyFree invoice generator for freelancers — PDF in 60 seconds
Jul 2026
TariffPediaFree import duty lookup for US, EU, UK & China
Jul 2026
TaxEd AbroadSimplify expat taxes, anywhere, Free, no sign-up needed.
Jul 2026
Cold Plunge CalcStop guessing your cold plunge time. Free & science-backed.
Jun 2026

Forums

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1mo ago

AI Cite Who - Understand why AI recommends competitors and what to improve

Understand why AI answers recommend competitors. Inspect buyer-question results, cited sources and competitor evidence, then get a prioritized plan for what to improve on your website and across third-party channels. Start with a free website analysis; AI-answer audits are paid and use selected ChatGPT, Gemini and Perplexity search configurations.

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4mo ago

InvoiceFormly - Free invoice generator for freelancers — PDF in 60 seconds

InvoiceFormly is a free invoice generator for freelancers and solo founders. Create a professional, customizable invoice and download a PDF in under a minute — no account needed. Pro ($9.9/mo) adds cloud storage, client management, recurring templates, and multi-currency support. Other tools are either too simple (Google Docs) or too complex (QuickBooks). InvoiceFormly sits in the middle: enough to get paid faster, no learning curve. Available in English, German, and French.

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4mo ago

TariffPedia - Free import duty lookup for US, EU, UK & China

Free import duty lookup with official US, EU, UK, and China tariff rates. Search by HS code or product to see duty, VAT, and de minimis thresholds. Every rate links to its official source. Updated 2026.