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**Behind the scenes**
- I love Rocket League and Counter Strike.
- I used to be a winemaker.
- Super happy when I'm hiking.

Josef Wilhelm

Experienced Software Engineer with a demonstrated history of working in the information technology and services industry. Skilled in Flutter, Dart, C#, PHP, Azure and Angular. Graduated from University of Duisburg-Essen.

Sebastian Röhl

Over $100K in 28 days. Solo dev. Habit tracking app. No VC. No team. Just me + years of iteration.

https://habitkit.app

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Awesome achievement at the start of the year. My "small" indie app business reached $30k MRR 🙌🎉

0 - 10k: 2.5 years
10 - 20k: 2 months
20k - 30k: 1 year

Help growing this number by checking out my new app tryfocuskit.com!

My app habitkit.app reached second place in the US App Store for the keyword "habit tracker". This is HUGE! Let's see if I can keep it 🤞

A new app won’t change your life on day one, but $100 MRR and >$1k in total revenue is proof that real people will pay. I love to celebrate the small milestones and keep stacking them. Keeps me motivated for the long game 🫡

Building An Indie App Business #86: $100K in 28 Days and the Habits That Got Me Here

$100K in 28 Days and the Habits That Got Me Here We’re back in the saddle for 2026! After taking a short break over the holidays, I’m feeling refreshe

Open article: Building An Indie App Business #86 by Sebastian Röhl • 7 min read

HUGE milestone for my new app tryfocuskit.com: 
$104 MRR
$1,000 Total Revenue in the last 28 days

Feels great to make progress with a new app 💪

Pretty happy with the development of tryfocuskit.com: If it makes ~$800 every month now, I am more than satisfied with the results. Hope to reach $100 MRR this month! I also have some cool updates planned for the app!

Forgot to post a Revenue update for my new app tryfocuskit.com: It made over $700 in it's first full month (December). And January is looking great as well already 🙌

At this point I am too scared to make any changes to my metadata ever again 😅

Building An Indie App Business #87: First $100 MRR with FocusKit and thoughts on AI coding

First $100 MRR with FocusKit and thoughts on AI coding Welcome back to another issue of my weekly indie log. Hope you had a good week! This time I wan

Open article: Building An Indie App Business #87 by Sebastian Röhl • 5 min read

Building An Indie App Business #85: New Year's Hype and Grand Goals

New Year's Hype and Grand Goals Welcome back to the very first issue of my weekly indie log in 2026! I’m really determined to write a new issue (almos

Open article: Building An Indie App Business #85 by Sebastian Röhl • 5 min read

Just released tryfocuskit.com v1.1.1 ✅
The main focus of this update is the Notes section.

• Cleaner, simpler notes modal
• New shortcut: reuse notes from previous sessions with one tap

Small feature, big quality-of-life win.

That's the type of email you love to see as an indie hacker 👌

Adding a small template library to tryfocuskit.com to help users quickly start building their custom routines.

Handling the edge cases for the new Routine management in tryfocuskit.com was a little bit tedious, but I think it turned out great 👌

Making it easier to change your selected routine in tryfocuskit.com. I think this will be a nice addition to the app 👌

My app tryfocuskit.com will be much more flexible with the next update! Can't wait to ship this 🙌

Feels good adding new perks to the paywall of tryfocuskit.com 💪

Whenever a UI screen feels wrong but I can’t explain why:
I step back.
I squint my eyes.

If the UI still feels clear, the structure works. Surprisingly effective 👌

taplio

The Battle

Josef Wilhelm

Sebastian Röhl

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taplio

The Battle

Josef Wilhelm

Sebastian Röhl

Followers

Posts

Engagements

Likes

Performance Score.css-goub6s{font-size:var(--chakra-fontSizes-md);font-weight:500;color:var(--chakra-colors-gray-600);display:block;margin-top:var(--chakra-space-1);}Sebastian Röhl's LinkedIn Performance

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Performance ScoreSebastian Röhl's LinkedIn Performance