Hi Product Hunt, James here, founder of VI Stack. I spent years researching businesses without a real system. I'd buy something because the story sounded good, sell it because the price moved, and never quite know what I'd learned. So I built the thing I wished existed. VI Stack is a process-driven framework for value investors. The free side of the site is the most useful starting point: - 13 free calculators; DCF, reverse DCF, owner earnings, margin of safety, and others — no signup, no paywall. - A free guide called The Five Gates, which walks through the research workflow I use on every company. - Notion templates for the Foundation (your investing identity), The Full Process and - The Full Research Engine (per-company research). The full operating system layers an AI guide on top that knows your Foundation, challenges your reasoning at each gate, runs an Advisory Board stress test against eight investor archetypes, and tracks monitoring anchors through quarterly reviews. It's built for the kind of investor who treats this as a craft, not a hobby. It's not advice. It's structure. Every output is a thinking tool, not a recommendation. Happy to take feedback on the calculators or the workflow, that's the part of the product I most want to get right. James vistack.io

VI Stack; Systematic Value investing

A repeatable research process for value investors

A repeatable research process for value investors