The other day I presented at Replit on 125 days of building 10+ production apps through vibe coding. Apps that have now been used over 750,000 times. I went in thinking I’d share what I’d learned. I came out with something bigger.
The Replit AI agent isn’t a tool anymore. It’s part of my team. Our team.
This isn’t hyperbole. This isn’t AI hype. This is the actual reality of where we are right now, in late 2025, building real software that real humans use at real scale.
In fact, we joke about how much we rely on our core AI Agents. “Replie” is Replit, “Arty” is Artisan, “Qualie” is Qualified. They are parts of our team. But Replit’s v3 AI Agent is the first AI Agent to cross the line and become truly part of the team.
The Shift: From Tool to Teammate. For Real.
125 days ago, I was using AI mainly as a knowledge and support tool for our community. Digital Jason.
Today? Replit’s AI agent (really, agents plural since v3) and I collaborate. We talk through features. We get on the same page together. We build together.
The difference is profound:
Then (125 days ago):
- Me: “Write a function that does X”
- AI: writes function
- Me: “No, that’s not quite right, change Y”
- AI: changes Y
- Repeat 5-10 times
Now:
- Me: “We need to add real-time benchmarking to the valuation tool”
- Replit: “Got it. Should we follow the same pattern as the pitch analyzer, or do you want this more lightweight?”
- Me: “Same pattern, but we need to handle the 275,000+ monthly calculations differently”
- Replit: “Right, I’ll optimize the query structure and add caching. Give me a sec.”
- It just flows
- Not perfectly, not without bugs, but it works. And we do it together. Seemingly — reading each other’s minds. As if Replie had one.
The (Almost) Unlimited Context Window Changed Everything For Us At Least
Here’s what really unlocked this: Replit now has essentially an unlimited context window. It knows me. It knows our apps. It knows much of our SaaStr.ai codebase. It knows our patterns.
This is radically different from even a few months ago.
The AI doesn’t just remember the last 10 messages. It remembers:
- How we structured the valuation calculator
- Why we made certain architectural decisions in the pitch analyzer
- The specific way we handle user data across all 10+ apps
- Our coding style, our patterns, our preferences
It’s like working with an engineer who’s been on your team for months, not a consultant you brief every single time.
The Real Numbers: 750,000+ Uses in Production
Let me be clear about what “production” means here:
- SaaStr.ai: 500,000+ users in 45 days
- 275,000+ startup valuations processed monthly
- 1,300+ pitch deck analyses run every month
- 10+ production apps built entirely through vibe coding
- $1.5M+ in revenue generated by AI agents across SaaStr operations
These aren’t toy projects. These aren’t demos. This is real software, used by real founders, processing real data, generating real revenue.
What I Learned Presenting My First 125 Days on the Replit AI Agent
When I summarized my knowledge for the Replit team, three things became clear:
1. Speed isn’t the win. Partnership is.
Yes, I can build faster. But that’s not the point. The point is I can now build with an AI that understands context, suggests improvements, catches edge cases I miss, and iterates with me in real-time.
2. The learning curve inverted.
125 days ago, I was teaching the AI how to code, in essence. Now, the AI teaches me better patterns, suggests optimizations I wouldn’t have thought of, and helps me write better software than I would alone.
3. We’re not even close to the ceiling yet. We’re just begun — for real.
Every week, the agents get better. Every week, I discover new ways to collaborate. Every week, the line between “me coding” and “us building” blurs more.
What 2026 Will Bring
If this is where we are in late 2025, imagine 2026.
Not co-pilots. Not assistants. Not tools.
AI agents that are truly, really, part of the team.
Agents that:
- Understand your business context as well as your best engineer
- Suggest features based on user behavior they observe
- Proactively fix bugs before you even know they exist
- Ship code while you sleep (with the right guardrails)
This isn’t science fiction. This is the obvious next step from where we already are.
The Bottom Line
125 days ago, I started vibe coding as an experiment. Could I build real software with AI? My first attempt didn’t go well. I started with too complex an app, and the AI Agent was too immature. But that was 125 days ago.
Today, after 750,000+ uses across 10+ production apps, the answer is clear: Yes. But that’s not even the interesting part anymore.
The interesting part is that AI has graduated from tool to teammate. And in 2026, that’s going to completely change how we build software.
Not because AI will replace engineers. But because the best engineering teams will be human + AI, working together, each making the other better.
That’s the promise of AI. And the other day, presenting at Replit, I realized we’re already living it.
