v0
An AI tool that builds web apps from prompts, screenshots and forks, shipping on Vercel.
v0 passed 1.3 million users, had its biggest day ever the day before the interview, and its community hit 20,000 submissions in under a month, with top apps forked up to 6,000 times. Rauch says retention beats other AI products he has built. Lesson: let users see and edit the AI's output, start from forks, and scope prompts small. Also, add fraud defenses before a generous free offer.
- 1Launch free year offerCursor, Lovable, Bolt, Replit, v0
- 2Fraud rings find exploitsMostly in China, via the API
- 3Offer goes viralSpread through student networks
- 4Engineer patches holesBarely slept for a week
- 5Attack shut downWorked with Stripe and Substack
From Lenny's Product Pass launch
What was said about v0
A too-generous free offer needs fraud defenses before launch. Lenny's Product Pass launched with a free year of Cursor, Lovable, Bolt, Replit and v0. Fraud rings, mostly in China, found exploits in the API and the offer went viral in student networks.
Lenny worked with Stripe and Substack to shut the attack down, and his engineer barely slept for a week patching holes. He calls it the most stressful business moment he has had and feared it could undermine trust in the whole subscription. His verdict: "that was way too good an offer. People came for it, bad people."
Everyone’s an engineer now: Inside v0’s mission to create 100 million builders | Guillermo Rauch
Passed 1.3 million users, had its biggest day the day before, and its community hit 20,000 submissions in under a month, with top apps forked 1,200 to 6,000 times. Rauch rebuilt his own site in 2 prompts versus 10 to 15 on the prior model, and says users retain better than on other AI products he has built.
A too-generous free offer needs fraud defenses before launch. Lenny's Product Pass launched with a free year of Cursor, Lovable, Bolt, Replit and v0. Fraud rings, mostly in China, found exploits in the API and the offer went viral in student networks.
Lenny worked with Stripe and Substack to shut the attack down, and his engineer barely slept for a week patching holes. He calls it the most stressful business moment he has had and feared it could undermine trust in the whole subscription. His verdict: "that was way too good an offer. People came for it, bad people."
A behind-the-scenes interview with Lenny Rachitsky on building his newsletter and podcast
One of five AI tools offered free for a year to Lenny's subscribers in the Product Pass.
AI prompt engineering in 2025: What works and what doesn’t | Sander Schulhoff
It relies on long, nuanced product prompts, an example of product-focused prompt engineering.
Behind the product: Replit | Amjad Masad (co-founder and CEO)
Cited as a chat-only tool, unlike Replit, which is a full IDE where you can open and edit files.
Becoming an AI PM | Aman Khan (Arize AI, ex-Spotify, Apple, Cruise)
Turns a prompt into a landing page, or a working UI with iteration, and is one of the tools PMs use to build prototypes for a portfolio.
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