AI-native startup teams in Silicon Valley are building their own internal tools — 100% customized — instead of buying SaaS. This is NOT amateur "vibe coding": these are professional internal developers dedicated to building internal tools, sped up 10x by AI. The structural signal: when AI collapses custom development costs by 10x, SaaS loses its core advantage (it's cheaper to buy than build). This is the demand-side complement to the supply-side [[AI Compression of SaaS Moats]] — not just that building SaaS is cheap, but that buying SaaS is no longer the rational choice for AI-native teams. ## Source - [[Trend I'm seeing in the Valley - the latest AI-native startup...]] (Zara Zhang, February 2026) ## Connections - Related to: [[AI Compression of SaaS Moats]] — supply-side (building is cheap) meets demand-side (buying is unnecessary) - Related to: [[SaaS Competition Collapse via AI Cost Structure]] — custom tools as ultimate SaaS competition - Related to: [[Agent SaaS Survival Bifurcation]] — internal tools represent the extreme case of "doesn't need SaaS"