The AI Build-vs-Buy Shift: Grounding the "SaaSpocalypse" in Retool's 2026 Data
The viral tech-circle claim in 2026 that "Build vs. Buy is dead... 38% of B2B buyers built an internal tool instead of buying SaaS" has been officially grounded in concrete data. The source of this trend is Retool’s February 17, 2026 report, “The Build vs. Buy Shift: How Vibe Coding and Shadow IT Have Reshaped Enterprise Software,” which surveyed 817 professionals across startups and Fortune 500 enterprises in late 2025.
The report confirms that enterprise AppGen (application generation) and "vibe coding" are actively eating into traditional SaaS categories, driven by faster build cycles and frustration with rigid vendor support.
Key Data Points & Verbatim Quotes
According to the official BusinessWire release:
- SaaS Replacement is Real: 35% of teams have already replaced at least one third-party SaaS tool with a custom-built solution, and 78% expect to build more custom internal tools in 2026.
- Widespread Shadow IT: 60% of respondents admitted to building software outside of official IT oversight in the past year, with 25% doing so frequently.
- SaaS Categories Under Pressure: Replacement risk is not limited to simple scripts; it spans workflow automations, internal admin tools, CRMs, BI tools, project management, and customer support.
- The "Vibe Coding" Shift: David Hsu, CEO and founder of Retool, explained the core driver:
"The markets are finally catching up to something builders have always known: that enterprise AppGen has become a threat to traditional SaaS. SaaS products force you to work their way. Now that vibe coding’s gone mainstream, businesses that can custom-build their value drivers will have a competitive edge."
- A Case in Point: Miles Konstantin, Head of Automation and Tooling at Harmonic, rebuilt a $20,000-per-year tool directly inside Retool:
"Their support was so slow that it was faster for me to rebuild the product inside Retool than wait for support to get back to me."
What This Means for Founders
- The "Why Can't We Just Build This?" Hurdle: Founders are no longer just competing against other SaaS vendors; they are competing against the customer's own internal developers armed with advanced LLMs and AppGen platforms. The default question in procurement is shifting to: "Why can't we just build this in-house?"
- Defend Your "Value Drivers": Generic workflow tools, basic admin panels, and simple databases are the easiest to replace. To survive, founders must build deep, proprietary integrations, specialized domain logic, or offer superior data gravity that cannot be easily replicated in a weekend "vibe coding" session.
- Shadow IT as a GTM Vector: With 60% of builders bypassing IT governance, developers/line-of-business teams are building their own solutions to bypass slow procurement. Founders can target these "shadow builders" by offering highly embeddable components, APIs, or developer-friendly building blocks rather than heavy, top-down enterprise suites.