SaaStr Updates '90/10 Rule' for Vibe-Coded SaaS Replacement — Framework: Replace if You Use Only 10% of Features

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SaaStr published a detailed case study where they replaced a paid SaaS tool in a single day with a vibe-coded application, then distilled the 90/10 rule: if your team uses 90% of a SaaS tool's value from ~10% of its features, a vibe-coded app can replace it. The 10% where SaaS survives: compliance requirements, regulated data, network effects, and scale that exceeds simple tooling. Top targets identified: workflow automations, admin tools, lightweight BI/reporting, simple CRM, and basic project management — matching the Retool survey data showing 35% of enterprises already replaced at least one tool.