40 for 40

Anyone else feeling this?

Twenty minutes ago, you felt unstoppable. You’d just built something you couldn’t have made a year ago. You didn’t even type. You Wispr’d it like Al Capone in a smoky jazz club.

Hell yes!

Let’s go on LinkedIn and show everyone my… then it hits you.

Oh shit.

A teenager’s built an algo arbitrage bot on Kalshi making $36k/mo. At this rate, they’ll be podcasting on 20VC before I’ve finished my… OMG, did he just raise a $50 million Seed round?

How does that make sense? That’s what the world feels like right now.

We’re feeling it too. So what do we do with that? Get in a room. Bring some good people. Make stuff together.

What it is

• 40 apps in 40 days: like a hackathon in public
• Live: Streamed on Twitch, daily shorts on socials
• How to participate: watch, interact, sponsor, or build alongside at home. Heck, come and build with us in person!

This is a community and we’re going to bring the fun back to building

How it works

To start
Our website build40for40.com starts with 40 problems from the community. Anyone at any time can add more. Starting at 40p, anyone can sponsor a problem they want solved throughout the 40 days.

Choosing the day’s challenge
Each morning at 9am, the problem that’s the most funded becomes the day’s challenge.

Choosing the format
Next, we spin a giant wheel: web app, game, ChatGPT app, WhatsApp chat bot, voice agent, or API

Time
We’ll also randomly select a time limit for how long we can spend on the day’s challenge: 3 to 8 hours.

Did we ship?
10 minutes left: did you commit to GitHub?
5 minutes: why isn’t the connection to Vercel working?
2 minutes: can you add one last feature?
0:00: is it live?

That’s 40 for 40.

Begins November 2, 2026