The Great Unbundling of 2026
For twenty years, the mantra of the CTO was simple: "Buy the best-of-breed SaaS, never build what you can buy."
But in May 2026, that wisdom is being turned on its head. A new report from Retool and Forbes indicates that 60% of US mid-market and enterprise firms have actively replaced at least one major SaaS subscription with a custom-built internal tool in the last 12 months.
The driver? The AI Developer.
The Economics Have Flipped
The traditional argument for "Buying" was cost and speed. Building a custom CRM used to take 12 months and $2 million. Buying a seat at Salesforce took 10 minutes and $150.
With AI-native development platforms (Agentic IDEs), that same custom CRM can now be built by a small internal team in 3 weeks for a fraction of the cost.
1. The Death of the "Integration Tax"
One of the biggest pain points of the SaaS era was the cost of connecting 50 different tools. Internal tools built with AI are "born connected" to the company's proprietary data lake, eliminating the need for complex middleware and expensive integration consultants.
2. Bespoke vs. Generic
"Generic SaaS forces you to follow their workflow," says a CTO at a Chicago-based logistics firm. "With our AI-built internal tool, the software follows our workflow. It’s a massive competitive advantage that we no longer have to share with our competitors who are using the same off-the-shelf software."
The "SaaSpocalypse"?
Does this mean the end of the SaaS industry? Not exactly. But it does mean the end of "Boring SaaS."
Software that only provides a basic CRUD (Create, Read, Update, Delete) interface over a database is the most at risk. If an internal team can recreate your core feature set in a weekend using an LLM, your business model is in trouble.
To survive, SaaS providers are pivoting toward:
- Deep Proprietary Data: Providing data that the company can't generate itself.
- Network Effects: Providing a platform where the value is in the other users (like Slack or LinkedIn).
- Complex Compliance: Handling regulatory burdens that are too risky to build internally.
Conclusion
The "Build vs Buy" pendulum has swung back toward Build, but with a twist. This isn't the slow, expensive building of the past; it is the rapid, AI-accelerated creation of bespoke ecosystems.
For SaaS founders, the message is clear: Be unique or be replaced. In 2026, "good enough" software is no longer a viable business model when your customers can build "exactly what they want" for themselves.