The Rise of the “N=1” App: When Building It Yourself Really Beats Buying It.

So we built 2 more vibe coded app for SaaStr. Even though we didn’t want to. We’re already managing 20+ AI agents and 10+ vibe coded apps and are strapped for time.

The Problem Wasn’t the Price. It Was the Product.

We’d been paying $10,000+ a year for a sponsor portal. It did the basics: sponsors could log in, manage booth details, upload a logo. Fine.

But we kept hitting walls. We needed sponsors to pick their booth from an interactive campus map. We needed a cleaner asset upload flow — logos, banners, collateral with actual specs. We needed better complimentary pass management. We needed it to work the way our event works, not the way some product manager assumed events work.

Every time we asked for something? It was either on a roadmap that never materialized, or a custom development fee on top of the subscription.

This is the core problem with niche vertical software. The TAM is small, which means the engineering team is small, which means the product evolves slowly. It’s not the vendor’s fault. The unit economics don’t support a strong engineering team building features for a few hundred customers.

So you get software that’s almost right. Covers 80% of your workflow and leaves you duct-taping the other 20% with spreadsheets and Slack messages.

So We Built It Ourselves

The new sponsor portal handles everything we actually need:

• Booth selection. Sponsors pick directly from an interactive campus map. No back-and-forth with the team.
• Asset uploads. Logos, banners, creative assets with specs and validation built in. Sponsors know exactly what to upload.
• Complimentary passes. Full management of customer passes and VIP badges — the part that always caused the most manual work.
• Registration and badge pickup. Everything a sponsor needs in one place, not scattered across four confirmation emails.
• Expo and booth specs. Booth specifications, floorplans, and setup requirements all in the portal.
• Timeline and task management. Sponsors see what’s due and when. They stop emailing us asking what they need to do next.

All vibe coded. Built around how we actually run SaaStr Annual.

10K Use Case #1: The Brain and Taskmaster

We built this on Replit over a week together with Claude Opus. It ingested four-plus years of SaaStr data: every campaign, every email open rate, every registration pattern, every sponsor interaction, every conversion rate by channel. Salesforce connected via APIs and Zapier. Real-time inputs from the agents we run daily.

From that, it builds and updates a six-month marketing plan — not at the campaign theme level, but daily executable tasks. What emails to send. What to do with our AI SDR. How much to spend on LinkedIn ads this week and what the creative should say. What I should be posting. Where we’re behind on the attendance goal.

We talk to 10K every day. “Where are we? What should I be doing today? What’s falling behind?” It’s not always right — I push back when something feels off and it adjusts. But it keeps the marketing plan from drifting. With everything else we’re managing — agents, sales, production, investors — someone needs to be watching it. That’s 10K.

And it is also tells us what to do.  We don’t have to ask it.  It pushes us hard.

No off-the-shelf tool does this. Not because good marketing tools don’t exist — they do. But the value here is entirely in our proprietary data. Ten years of what’s worked for SaaStr. No vendor can give you that.

The N=1 Thesis

Before vibe coding, building a custom app almost never made sense. Custom development cost $50K-$100K minimum, took months, and you owned a buggy codebase forever with no support. The math didn’t work.

Vibe coding changes the math. When you can build a working application in hours instead of months, the question stops being “can we afford to build this?” and becomes “can we afford to keep using a product that doesn’t do what we need?”

The sponsor portal was a $10K/year problem we solved in days. The two 10K apps filled a $20K+/year gap the market hadn’t built — in a weekend.

The Tradeoffs

• Maintenance is on you. When something breaks — and it will — there’s no support ticket. Every edge case, every browser quirk, every sponsor who can’t upload a PNG. That’s yours permanently.
• Building isn’t free, even when it’s fast. Someone still has to think through the UX, test the flows, handle edge cases, and update it when requirements change. That person is you.
• No vendor roadmap. With SaaS you get development driven by hundreds of customers’ feedback. With an n=1 app the only feedback loop is your own team.
• Complexity compounds. We now manage 10+ vibe coded apps and 20+ AI agents. That’s real overhead. It’s manageable because the apps pull their weight. But be honest about what you’re taking on.

What This Means for B2B Vendors

Every company using niche vertical software is going to ask the same question we did: Is the market giving me what I need? Or can I build something better myself?

For big horizontal platforms this isn’t a direct threat. Nobody’s vibe coding a replacement for Salesforce or Workday. The depth and integrations are real.

But two categories are at risk:

Small niche tools with $5K-$50K contracts — thin markets, thin engineering teams, products that evolve slowly. Your customers now have a real alternative to waiting for your roadmap. They’ll build around you.

Products serving a specific workflow within a larger role — the weekly meeting, the pipeline review, the campaign briefing. A custom app built around your specific data and cadence beats a general product for these. Every time.

There’s no product on the market that runs your weekly marketing meeting the way 10K runs ours. Not because nobody tried — but because the TAM for “exactly Jason Lemkin’s Monday meeting” is one. So no one built it.

We did. On Replit + Claude Code

The concern for B2B founders isn’t that customers replace entire platforms. It’s that customers start routing around the parts that don’t work — and find out it’s faster and better than waiting.

The Bigger Picture: Buy It … If You Can. But Now, You Can Built If If You Really Need It … And You Can’t Buy It

We’ve built apps with 850,000+ combined uses. We now run SaaStr with 3 humans and 20+ AI agents — and grew faster after cutting the team than before.

Not every workflow needs a custom build. Most SaaS products are still the right answer for most problems. The discipline is knowing which category you’re in.

But more workflows fall into the n=1 category than you think. The cost to build dropped 10x. The gap between what off-the-shelf software gives you and what you actually need has always been there — now you can do something about it.

We built a sponsor portal that works the way we need. We built a true AI VP of Marketing, “10K”. None of these decisions were about cost. All of them were about needing something the market couldn’t give us.

That’s the n=1 thesis. And it’s not going away.

Come talk about this at SaaStr AI Annual 2026, May 12-14 in SF Bay!