E-Invoicing
6 apps planned
EU-compliant invoicing tools, smart templates, and automation for freelancers and SMEs.
Season 01 · 2025–2026
1 app(le)
a week
52 web apps. 52 weeks. One builder, one mission — shipped in public, one apple at a time.
9Apps shipped
43To go
9Tracked
Week 9 · Live Now — ZUGFeRD PDF GeneratorDomain — E-InvoicingDomain — FinanceDomain — AI ToolsDomain — KidsBuilt with — LovableApps Shipped — 9 / 52Next Drop — FridayDomain — HealthDomain — ProductivityWeek 9 · Live Now — ZUGFeRD PDF GeneratorDomain — E-InvoicingDomain — FinanceDomain — AI ToolsDomain — KidsBuilt with — LovableApps Shipped — 9 / 52Next Drop — FridayDomain — HealthDomain — Productivity
Year Progress
Week 9 of 52
The Apps
Every week, one app
Domain
Status
9 of 9 apps
Week 01
Product MgmtApp(le)s
Launching this website
Live♥ 1💬 0
↗Week 02
KidsLittle Witch Academy
Small games with AI to learn and have fun
Live♥ 0💬 0
↗Week 03
E-InvoicingInvoice Mapper to EN16931
Map your invoice format to EN16931: Upload your invoice file and let AI automatically detect the format and map fields to the European e-invoicing norm.
Live♥ 0💬 0
↗Week 04
Product MgmtProducts Arena
The Arena Where Products Compete to Be #1
Live♥ 0💬 0
↗Week 05
KidsGargoyles: Clan of the Night
They were carved a thousand years ago to protect a castle on a cliff. Tonight they wake on a glass tower above Manhattan — and the city already has enemies.
Live♥ 0💬 0
↗Week 06
KidsFirst Claude app: Family Council
This is the first app I built 100% with Claude Code (and actually as well with Lovable).
Live♥ 0💬 0
↗Week 07
E-InvoicingInvoicia - Fun way of learning e-invoicing country mandates
Invoicia turns dense tax rules into bite-sized lessons, quick quizzes and role-play scenarios. Built for AR clerks, AP clerks and Tax Managers.
Live♥ 0💬 0
↗Week 08
HealthAllergy Radar
I build a web app to show the forecast for allergies. Plan is to also launch this as my first mobile app.
Live♥ 0💬 0
↗Week 09
E-InvoicingZUGFeRD PDF Generator
German B2B e-invoicing mandate is around the corner. I built a simple ZUGFeRD PDF generator allowing AR clerks to generate a compliant ZUGFeRD PDF as well as AP clerk to validate a ZUGFeRD PDF and get a validation report.
Live♥ 0💬 0
↗"Keeps the doctor away — one shipped idea at a time."
The Rule
One app ships every Friday. No exceptions. No polish paralysis. Shipped beats perfect, every single week.
The Domains
Finance, AI, invoicing, product management, health, fitness, kids, and productivity. Real problems, real people.
Build in Public
Every build is documented. Every failure is shared. The journey is the product.
The Stack
Built with Lovable. Fast, visual, and repeatable — so each week's app goes from idea to live in days.
Domains
9 worlds,
52 problems
Finance
7 apps planned
AR, AP, cash flow, budgeting, and personal finance dashboards that actually make sense.
AI
8 apps planned
Practical AI wrappers that solve one thing really well — summaries, drafts, classifiers.
Product Mgmt
6 apps planned
Tools for PMs: roadmaps, standups, prioritization frameworks, and stakeholder updates.
Kids
5 apps planned
Screen-time-conscious apps for learning, creativity, and calm — for ages 3–12.
Fitness
5 apps planned
Simple tracking, habit building, and workout planning without the bloat of big apps.
Health
5 apps planned
Mental wellness, sleep, mood, and nutrition tools built for the busy and the forgetful.
Productivity
6 apps planned
Focus tools, capture apps, and workflow helpers for makers who ship fast.
Wild Card
4 apps planned
Unexpected, experimental, and fun. These are the ones nobody saw coming.
Newsletter
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Every Friday: one new app, one build diary, one lesson learned.