Online
ReelMusic
Original, royalty-free music composed from your video. No muted Reels, nothing to license.
QCrd and ZenVibes are shut downI've shipped 15 products solo.
Roman Koch · Indie app developer in Berlin. Some useful, some not so useful but funny.
How I build, launch and sometimes sell small apps. Once a month, straight to your inbox.
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15
Products shipped solo
10
Still online
12
Articles written
Products
Everything I have shipped solo.
Online
InsightsKit
Feature requests and support inside your app, at a flat indie price. Free for your first app.
OnlineFree
igooor
Private speech to text for Mac. Press a key and talk: your words appear in any app, offline.
OnlineFree
Pushup Club
Daily pushups, compete with friends, join global challenges. One club, one goal: 100B pushups.
Shut down
SafeNest
Make your home safer for babies and toddlers, without guessing.
Online
Thinkpool
Create voice notes, tasks or lists. Just talk, Thinkpool does the rest.
Shut down
Easy Post
Record your ideas, transcribe, and let AI generate your LinkedIn and X posts.
Online
BP Tracker
Beat it! Track your blood pressure and heart rate.
OnlineFree
Mars Mission
Small free indie game: fly to Mars and rescue cosmonauts in space.
Online
Split&Tip
Calculate tips and split bills easily.
Online
Breathe Out
Quit smoking step by step. Get a personalized plan, track progress, and stay motivated.
Shut down
Cookie Time
Track your work. Save time. Stay organized. Ideal for freelancers.
OnlineFree
Fast&QRious
Create and share QR codes instantly. Simple, fast, and hassle-free.
Shut down
ZenVibes
Train your mind. Boost your confidence with affirmations and growth challenges.
Shut down
QCrd
Your digital business card, instantly. Create and share it via QR code.
Writing
Notes on building, launching and marketing indie apps.
Tech5 min
Someone Pulled an API Key Out of My Old App and Sent 14,364 Requests
An old Flutter app, a forgotten test key, and someone else's AI pipeline running on my bill.
Personal4 min
September 2026: building got fast, and my distribution problem got worse
About two weeks to ship an app. 13% fewer downloads.
Business7 min
The Part of App Store Localization Nobody Automates
Translating the marketing headline was never the expensive part.
Tech7 min
What’s the Difference Between an AI Skill and an AI Agent?
A practical, slightly technical breakdown, using a real fashion-tech build as the example.
Personal6 min
What I Had to Relearn as an Indie Developer
There is something deeply attractive about indie development.
Personal4 min
I Never Planned to Use My Own Blood Pressure App, Until I Ended Up in the Emergency Room
When I started building Beat It, I was not thinking about myself as the future user.
Interesting resources
Sites by other people that I find worth a visit.
Berlinberberber.de
berberber
What is happening in Berlin, in one list: meetups, workshops, language cafés, talks and more, with day and time.
AI researchhappyoverlord.com
Happy Overlord
A research catalog on AI: technologies, devices, companies and stacks, plus a researched blog. The author's own daily working tool, shared in public.
AI newsaiaiaiaiaiaiaiaiaiaiaiaiaiaiaiai.com
16 × AI
An AI news engine: it reads trusted sources, scores them with Claude and posts only what clears the bar. A new issue every two days, on Telegram, RSS or email.
About
I'm Roman, an indie app developer based in Berlin. I build mobile apps, SaaS tools and other digital products with Flutter, iOS, Android and AI. My mission: build useful things, and some not so useful but funny ones.
If you want to talk about apps or indie business, write me at contact@romankoch.online.