Lei Shi

Independent Maker | MiniVentureLab

About

I'm an independent maker with a background in quantitative analysis and financial modeling. Through MiniVentureLab, I build lightweight, practical tools that help small businesses make better decisions. My first launch is MarginGuard, a free browser-based discount profit planner for online merchants.

Links

MarginGuard

Badges

Tastemaker

Gone streaking

Maker History

MarginGuardPlan discounts with a clearer view of your profit
Nov 2026

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Joined Product HuntNovember 8th, 2026

Forums

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22h ago

MarginGuard - Plan discounts with a clearer view of your profit

MarginGuard helps small online merchants plan discounts without overlooking profit. Upload a product CSV or try the free demo, compare promotional offers, protect priority SKUs, and improve your discount plan against a minimum profit goal. No account or Shopify integration required. Financial inputs stay in your browser.