The Future of SaaS Subscriptions vs Custom-Built Stacks (Claude Code)
SaaS subscription sprawl is pushing teams toward custom-built, AI-assisted stacks. See the build vs. buy framework and when Claude Code changes the economics.
TABLE OF CONTENTS
If your company’s “SaaS stack” feels like a stack of receipts, you’re not alone. Subscription sprawl (and the cost of paying for features you don’t use) is pushing teams toward a new default: a custom-built, AI-assisted stack that’s cheaper to tailor, easier to change, and closer to the way the business actually works.
In practice, this shift looks like replacing multiple point tools with a handful of infrastructure primitives (hosting, source control, database) and an agentic coding layer that can build and maintain internal apps quickly—often without a full engineering team.
The thesis: SaaS isn’t dying—unbundling is
Traditional SaaS solved a real problem: shipping “good enough” workflows for the majority. But as teams mature, the 20% of “your way of working” that SaaS can’t represent becomes the 80% of friction you feel every day.
When AI-assisted building becomes fast enough, the economics flip:
- Buy a tool when it’s truly a commodity (email, documents, identity)
- Build when the workflow is your differentiator or when you’re paying for complexity you don’t need
- Hybrid when you keep the system of record in a core platform but build custom layers around it
Why this is happening now (and why Claude Code matters)
AI coding tools are moving from autocomplete to agentic execution: reading codebases, making changes across files, running commands, and shipping working implementations. Claude Code is an example of this “delegate real work to an agent” model, which makes building internal tooling dramatically cheaper and faster than it used to be.
That doesn’t mean “anyone can build anything instantly.” It does mean:
- A small team can prototype bespoke workflows in days, not months
- Maintenance becomes less scary because changes are quicker to implement
- Agencies can deliver higher leverage outcomes (systems, not just zaps)
The new default stack: fewer tools, more primitives
A common modern pattern is:
- GitHub for source control and change history
- Vercel for hosting and deployments
- Supabase for a database + auth + storage
- Claude Code (and similar agentic coding tools) to build and evolve the software
This is not a “one stack for everything” prescription. It’s a starting template that makes custom apps feel as easy as subscribing to one more SaaS product.
What gets replaced first: workflows, not infrastructure
The first tools to get displaced are the ones that mostly act as workflow glue or UI shells over your data:
1) Automation glue (Zapier, Make, etc.)
Tools like Zapier are incredibly useful—but they can become brittle as your process evolves. When an internal workflow becomes core, teams often want:
- Better observability (logs, retries, alerts)
- Better data modeling
- Fewer hidden failure modes
A custom orchestrator (even a lightweight one) can replace dozens of Zaps once you know what “should happen” and can encode it directly.
2) Lightweight databases and internal apps (Airtable)
Airtable is an excellent bridge from spreadsheets to real systems. But many teams eventually hit:
- Permission and audit needs
- Complex business rules
- UI requirements Airtable isn’t designed for
A custom internal app built on a real database can keep the flexibility while improving structure and control.
3) Knowledge + lightweight ops workspaces (Notion)
Notion is still going to be a core tool for many teams—especially for documentation, knowledge bases, and planning. The “replacement” story is usually more nuanced:
- Notion stays as the knowledge layer
- Custom apps/agents take over transactional workflows (intake, routing, approvals, system-to-system sync)
In other words: it’s less “delete Notion” and more “stop forcing Notion to behave like a vertical SaaS product.”
What stays: the real commodities
Even in the most aggressive “custom stack” world, teams tend to keep:
- Google Workspace or Microsoft 365 (email, documents, calendar)
- A small number of specialized systems of record
The goal is not zero SaaS. The goal is less duplicated capability and less paying for unused features.
Who changes slowest (and why): enterprise systems
Enterprise platforms (ERP/CRM suites and heavily customized deployments) tend to change slowly because:
- Migrating data is hard
- Compliance and procurement are slow
- Risk tolerance is lower
But the pressure still applies. If mid-market teams can build custom workflows cheaply, enterprise vendors will have to adapt their value proposition (or get unbundled at the edges).
Build vs buy vs hybrid: a practical decision framework
Use this quick checklist when advising clients (or deciding internally):
Choose “buy” when:
- The workflow is commodity and stable
- The vendor’s compliance/security posture is a strong fit
- You’d be rebuilding table stakes
Choose “build” when:
- You’re paying for lots of features you don’t use
- The workflow is unique to your business model
- The process changes often and SaaS can’t keep up
- You need reliability and observability beyond “it usually works”
Choose “hybrid” when:
- You want a stable system of record, but custom UX/workflows
- You can keep data in one place while tailoring execution
What this means for automation agencies
This shift is a tailwind for agencies that can:
- Translate operations into clear requirements
- Build reliable internal systems (not just automations)
- Maintain them as the business evolves
The work becomes less about “connecting apps” and more about “designing systems.”
The bottom line
SaaS subscriptions aren’t disappearing overnight—but the era of stacking dozens of point solutions is ending. The future looks like a smaller set of core tools plus a growing layer of custom software and AI agents that match how teams actually operate.
Get help building the right stack
Knowing when to build versus buy is the easy part. Executing it—especially with AI coding tools like Claude Code—usually breaks at the requirements stage, when the team can't translate their operations into something buildable. If that's where you're stuck, book a ZoomFlow session—one of our consultants can map your workflows and identify the first custom build that would actually move the needle.
