Sebastian Mattsson

I've built something to fix what every founder struggles with: distribution. Launchli runs your content for you, it learns your tone, creates weekly posts, and schedules them automatically. Tired of seeing great products die with no users. launchli.ai

Day 12 of building Launchli in public. Today wasn’t about adding. Today was about removing. Every time I simplify the flow the whole product feels clearer. Fewer steps. Fewer decisions. Fewer chances to get stuck. Progress isn’t always more. Sometimes it’s less.

I’m 19 and building a SaaS solo. No team. No investors. Just focus and internet. Some days feel unstoppable. Some days feel invisible. But that’s the fun part Watching something go from nothing to noticed.

Day 11 of building Launchli in public. Ten days of feedback. Ten days of iteration. And something shifted today. The product finally feels like it’s finding its shape. It’s not guessing anymore. It’s guiding. That’s a good feeling.

Developers try to code their way out of marketing. You don’t need a new feature. You need attention. Nobody can pay for a product they don’t know exists. Code builds a product. Marketing builds a business.

Day 10 of building Launchli in public. I’ve learned more in the past 10 days than in months of planning. Building in public forces clarity. You can’t hide behind “someday”. You build, share, get feedback, adjust, repeat. Ten days of that cycle changes how you think.

Day 9 of building Launchli in public. Building solo is weird. Some days you feel unstoppable. Other days you question everything you’ve built. Today was both. Just trying to keep belief ahead of doubt long enough to ship.

Day 8 of building Launchli in public. Half my day was me arguing with myself. “Keep it simple.” “But users want options.” “Ship it now.” “Wait, test it first.” Building solo is basically managing multiple versions of you at once. At least one of them is productive.

Day 7 of building Launchli in public. One week in and it already feels completely different from Day 1. We’ve rebuilt the content flow, added campaign goals, scheduling, and multi-campaign support. It’s starting to feel structured, like something founders can actually rely on.…

This stage of building is wild. You spend days polishing one flow. Then a single piece of feedback makes you rethink it all. And somehow the new version is 10x better. Progress isn’t linear. It’s feedback → chaos → clarity → repeat.

Day 6 of building Launchli in public. Massive progress today. Took in all the early feedback and completely refined the flow. Now you can: → Create campaigns with specific goals → Run multiple campaigns at once → Schedule every post automatically It’s starting to feel like…

Day 5 of building Launchli in public. Spent most of today thinking about UX. Option A: quick buttons → instant post ideas. Option B: chat flow → slower, but higher-quality results. One’s frictionless. The other’s powerful. Still figuring out what the sweet spot looks like.

Every day I find one small thing that makes the product a little better. No big wins. No “viral moment.” Just quiet progress stacking up. It’s not glamorous, but it’s real. That’s how momentum is built.

Day 4 of building in public. The last few days have been a blur of feedback, caffeine, and small wins. Today everything started to click. The tone cloning feels more natural, the flow smoother, and the product finally feels alive. Still tons to fix, but I’m starting to see…

Been staring at my screen for hours. I swear I fixed the same bug three different times today. But the product’s better now. And somehow that makes it worth it.

Day 3 of building Launchli in public. The first bits of feedback are coming in. Some people love it, some are confused. And a few broke things in ways I didn’t know were possible 😂 But that’s the best part. It’s when the idea stops living in your head and starts living in…

Coffee MUST be broken. I was grinding all morning, brain fog, 0 focus, everything felt off. Then I got another cup… And suddenly everything clicked. Got way more done in 2 hours than the rest of the day combined. Spent most of today improving the voice cloning system. The…

Day 2 of building Launchli in public. IT FINALLY HAPPENED. The first user on the paid plan. Someone out there actually signed up and decided this was worth trying. All those late nights suddenly make sense. One real person using something that existed only in my head a week…

I forgot how good it feels to actually ship something. Not for a client, not for a boss, not for an algorithm, just for myself. I’ve been building quietly for months, second-guessing every little decision. Waiting for the perfect time to launch. Turns out, there is no perfect…

Day 1 of building Launchli in public. I’ve lurked on X watching other founders grow their SaaS from 0 → $10k/month and thought, “man, that looks fun.” So here we go. Building Launchli, an AI that learns your tone, writes weekly posts in your voice, and even schedules them…