How Martynas Krupskis Launched Fieldy With a Single Tweet

"Learn to sell. Learn to build. If you can do both, you'll be unstoppable." — Naval Ravikant

Some quotes just stick. For an early Turing’s learner Martynas Krupskis, that one lit the fuse.

Today, Martynas runs Fieldy, a voice-powered wearable AI note taker pulling in six figures of monthly revenue. But the company didn't start with funding, a product team, or even a website. It started with a demo video, a Stripe link, and one gutsy tweet that lit up the internet overnight.

This is the story of how a quiet Lithuanian developer went from shipping clunky prototypes to building one of the most viral AI hardware startups of 2024.

The Early Days: From Google Intern to $200-a-Month Flop

Martynas didn't dream of virality. He dreamed of building. He and his brother used to binge old Y Combinator talks like most teens watch Netflix. That obsession landed him internships at places like Vinted, Google, and eventually Microsoft's Dublin office.

But the learning curve there was flat. "The pace was super slow — I didn't learn much," he told Turing College co-founder Lukas during a recent webinar.

Frustrated, he tried his hand at building something real: a local version of the food-waste app Too Good To Go. He signed up restaurants, ran operations for six months, and made… about $200 in revenue.

That might have been the end of the story until he started seeing friends making $10k–15k per day selling ChatGPT prompt bundles online.

"I was building something that couldn't even pay a salary. They were printing money. That gap hurt," he admitted.

The Spark That Became Fieldy

The idea for Fieldy came while Martynas was contracting at a startup called Central. He kept circling one question: "What if ChatGPT could hear every conversation my users have?"

That thought wouldn't let go. So he booked a flight to San Francisco, found his way into the Founders Inc. hackerspace (by helping another resident build talking plush-toys), and started hacking.

The first prototype was duct-tape engineering at its finest: circuit boards dangling on fishing a line and batteries literally exposed to the air.

"Ship Tonight or Someone Else Will"

Spring 2024 was the peak hype for AI wearables. Companies like Limitless and Tab were teasing polished product videos but wouldn't ship for months.

Martynas's prototype was barely functional, but someone at Founders Inc. looked at it and said: "You have to launch right now."

So they did. He stayed up until 3 a.m., cut a 30-second iPhone demo, and posted this to X:

"Everyone's posting demos — f** it. Buy this and I'll ship next week."

No website. No pitch deck. Just a Stripe link and a product barely held together with a fishing line.

With only 1,000 followers, Martynas DM'd about 40 founders and engineers asking for retweets. That was the entire distribution plan.

The Tweet That Changed Everything

By breakfast, the tweet had:

600,000 impressions
1,500 likes
200 units sold
$20,000 in Stripe receipts

That was enough for Martynas to quit his contract job and go full-time. VCs started sliding into his DMs. One stranger even offered him a beachfront house for a week just because they loved the energy of the launch thread.

Building Fieldy for Real

Fast-forward to today:

Team: Fieldy has 10 people, mostly engineers.
Revenue: Over $1.5M in total sales. Low six figures in monthly recurring revenue.
Speed: Martynas still builds landing pages himself in Webflow, usually in under a day.

He's still hands-on. Still scrappy. And still driven by the same mindset: launch fast, learn fast.

Life Beyond the Launch

Founders Inc. wasn't just a backdrop — it shifted Martynas's perspective. "If you needed help, people stayed up with you to finish the thing," he said.

The collaborative chaos inspired him to start building a similar space in Vilnius to make sure future Baltic founders don't have to fly 8,000 kilometers to find their people.

He also encourages anyone from Europe who can afford it to spend at least a season in San Francisco: "The whole city feels like a university where everyone wants to build something."

What You Can Learn From This

Whether you're an indie hacker, freelancer, or someone quietly planning your escape from corporate life, here are a few sharp takeaways from Martynas's story:

Your first product may flop. His food app did. But it taught him to ship, sell, and try again.
Virality is engineered. He didn't "get lucky." He seeded that tweet with 40+ personal DMs.
Risk is your compass. If your launch copy doesn't make you nervous, it's probably too safe.
Speed beats polish. Ship the demo first. You can fix latency and UX later.
Narrative wins. That scrappy iPhone video told a better story than a perfect website ever could.

Final Word

Martynas Krupskis wasn't "the guy who sold an AI wearable with one tweet." Not at first. He was just a builder who refused to wait for permission and knew how to make noise when it counted.

If you're sitting on an idea, waiting for it to be "ready," this story is your sign. You don't need perfect. You need guts, a demo, and a Stripe link.

Ship it.