Who is my contractual counterparty?

Finn Glas, a German sole proprietor based in 72461 Tailfingen, Germany. Address, press contact under §18(2) MStV and every disclosure required by §5 TMG live at /imprint.

Where is the data stored?

On dedicated servers we operate ourselves, physically located in Germany. Records, attachments, audit log, embeddings - all in the same EU jurisdiction. Backups stay within Germany at other physical locations and roll off on a 30-day window. We deliberately don't name the exact provider or data centre - it doesn't help the customer and would make operator changes a public event.

Which law applies in case of a dispute?

German law, excluding the UN Convention on Contracts for the International Sale of Goods. Mandatory consumer protection rules of your country of residence remain unaffected. Venue is the registered seat of the operator (see /imprint), where legally permitted. No arbitration clause - you have the same legal recourse as with any other German vendor.

Can I get German-language support?

Yes. Both co-founders reply in German and English. No outsourcing, no ticket queue, no bot replies - you talk to someone who wrote the code.

How does the invoice + refund work?

Stripe issues a PDF invoice automatically after every payment, with VAT shown where applicable (the German Kleinunternehmer status under §19 UStG can drop the VAT line - the invoice is still fully bookkeeping-grade). Refund is self-serve in account settings: within the first 30 days of any new paid period you can refund the most recent charge yourself - no email, no exit interview. Full text in /terms §4.

Contact Book

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Contact Book: the German alternative to Vibe-coded DIY

Hosted in Germany, German operator of record, German law. Same three pillars, English URL.

German alternative

DIY

Build vs buy

Vibe coding

Finn GlasCo-Founder + Engineering

·April 4, 2026·

2 min read

Contact Book is the German alternative to Vibe-coded DIY: hosted in Germany, German operator of record, German law applies. Three things that travel together for a reason - any one of them on its own is half a promise.

At a glance

Vibe-coding your own personal CRM is genuinely satisfying for the first weekend. Contact Book earns its place around month three, when you realise you've spent twenty hours patching CSV import bugs, fighting with auth, and still don't have reminders firing reliably. The cost isn't the build - it's the long tail of being your own product team for one user.

Three pillars together

Three pillars that travel together

Hosted in Germany alone means little if the operator of record is a Delaware LLC - the CLOUD Act follows the seat, not the server. A German operator alone means little if the servers sit in Virginia - the access risk lives there. German law alone means little if both of those are missing - the venue clause cannot solve a data problem. Contact Book brings all three together: dedicated servers in Germany, Finn Glas (sole proprietor) registered in 72461 Tailfingen, German law on the contract. The gap to Vibe-coded DIY is usually that one of these three is missing.

Contact Book vs Vibe-coded DIY: German-vendor comparison

	Ours Contact Book	Theirs Vibe-coded DIY
Hosted in Germany		Whatever you pick
Initial setup	5 minutes	1 weekend
Total time over 2 years	~5 hours	~80+ hours
Reliable cadence reminders		If you build a worker
Live multi-tab updates
Mobile UI		DIY
Backups + disaster recovery
Updates + security patches
MCP server / agent integration		If you build it
Free tier		Hosting cost
Yours to fork
Yours to walk away from

When to pick which

Pick Contact Book when

You want a tool that already works on Sunday evening, not one you're still patching by Sunday at midnight.

Your time is worth more than €1/month.

You'd rather spend the weekend on the actual people in your contact list than on the tool.

Pick Vibe-coded DIY when

Building it is the point - you'd write it for the practice, not the product.

You have very specific needs none of the existing tools nail.

You want every byte to live on hardware you physically control, and you have the time to operate it.

Common questions

What German-buying teams typically want answered before they switch.

Start with Contact Book

Free plan, no credit card. We host in Germany. Export + delete are self-serve.

Written by

Finn Glas

Co-Founder + Engineering

Finn is one of the Co-Founders. He owns the engineering side, the infrastructure, and most of the late-night fixes that ship before anyone notices.

finn.glas at aicuflow dot comLinkedIn Website