Bolt

Bolt won by adding its in-browser virtual machine to an AI coding copilot. The team worked in obscurity and open sourced a project, then combined their web-stack virtual machine that runs in the browser with an AI coding copilot and ended up with something better than anyone else had.

Mark Pincus was impressed enough by this story that he cold-emailed the founder.

Lenny's Podcast

At hypergrowth, deciding which inbound leads to answer becomes half the job. Bolt went from 0 to $50 million in six months, and half the work was choosing which leads to respond to.

It closed a seven-figure deal that would have gone to Lovable, because nobody at Lovable called the buyer back.

Lenny's Podcast

Bolt makes non-coders feel superpowered by making decisions for them. Zevi Arnovitz, a Meta PM who doesn't write code, started on Bolt. Like Lovable, Replit, Base44 and v0, it uses the same underlying models but adds a layer that picks things like sign-in and database for you.

That makes building easy but gives less control. He left when connecting payments got too hard and the tool felt too opinionated, moving to Cursor and Claude Code for full tool access and the latest model abilities. Quote: "I think that the main difference between all these tools is basically the harness."

Lenny's Podcast▶ 58:05

Bolt codes immediately, so complex work needs a planning step first. Bolt's coding-agent system prompt starts writing code at once. That works early on but caused really gnarly bugs in his apps on complex work like payments and database changes.

His fix is to have the AI read the codebase, ask clarifying questions about scope, data model, UX and grading, and write a plan before any code. Quote: "planning is really important when you're implementing something technical"

Lenny's Podcast▶ 1:03:20

Treat Bolt as one step on a path from chatbot to terminal. He recommends starting in a ChatGPT or Claude project, moving to Bolt or Lovable, then Cursor in light mode, and eventually the terminal, moving up only when you outgrow each tool.

Looking at code works as exposure therapy, and because code is just files, the same project carries across tools.

Lenny's Podcast▶ 11:44

A free year of Bolt drew fraud rings to Lenny's Product Pass. Bolt was one of five AI tools, with Cursor, Lovable, Replit and v0, offered free for a year to Lenny's paid subscribers. Fraud rings, mostly in China, found exploits in the API and spread them through student networks.

Lenny worked with Stripe and Substack to shut them down while his engineer barely slept for a week. He calls it his most stressful business moment. Quote: "that was way too good an offer. People came for it, bad people."

Lenny's Podcast▶ 44:00