Dargel Solutions · Digital Products

Digital products with verifiable substance.

Practical guides and playbooks with working calculators and templates. Published under Adrian Verdan, the publishing imprint of Dargel Solutions. Buy selected guides directly from Dargel Solutions, with Gumroad available as an alternative. Dargel Solutions publishes the AI Starter, the way in, for free.

Current products

Practical guides and playbooks for starting and automating a small business.

Cover of the AI Starter “From Chat to Your Own Tool”: a route in seven steps from Understand to Stay safe on light paper

Free · in exchange for your email address

AI Starter: From Chat to Your Own Tool

The way in, no programming required: over one weekend, build your first tool of your own with an AI agent, and check it so you can trust it.

  • 12 chapters as a PDF
  • Working example project (ZIP), 3 short videos on the page
  • As of 29 September 2026, language English

€0.00 Instant download · occasional emails about our guides and tools, unsubscribe any time

Get it free Steps and videos →

Cover of “Registering a Kleingewerbe in Germany”

Registering a Kleingewerbe in Germany

The step-by-step guide to starting a small business in Germany, from the decision to your first income-expense statement. Written in English for expats, German terms explained.

  • 9 chapters, HTML bundle plus PDF
  • 4 calculators, example income-expense statement (XLSX/CSV), checklist
  • Edited 5 September 2026, language English

€4.90 Final price · EU consumers · PayPal

Buy direct: Start a Kleingewerbe in Germany Contents and preview →

Cover of The AI-First Operating Playbook

The AI-First Operating Playbook

A practical playbook for AI automation in small businesses — with an ROI calculator and working templates. Written in English.

  • 9 chapters, HTML bundle plus PDF
  • ROI calculator, 4 XLSX templates, 4 Markdown tools
  • AI update September 2026, language English

€12.90 Final price · EU consumers · PayPal

Buy direct: AI-First Operating Playbook Contents and preview →

Cover of Orchestrating AI Agents — score motif in dark petrol with an amber approval ring

Orchestrating AI Agents

A practical playbook for making AI models work together — reviewer patterns, routing, research verification and cost control. The multi-agent deep dive behind the AI-First Playbook.

  • 10 chapters, HTML bundle plus PDF
  • Interactive cost calculator, 2 XLSX workbooks, prompt pack
  • AI update September 2026, language English

€12.90 Final price · EU consumers · PayPal

Buy direct: Orchestrating AI Agents Contents and preview →

Cover of Nobody Opens a Passing Check — fifteen check marks in a dark field, one of them unfilled

Nobody Opens a Passing Check

A logged field report from thirty-nine days of a two-agent operation, and the fifteen things counted as coverage — fourteen green lights and one unused capability — that still missed the question that mattered.

  • 15 chapters, HTML bundle plus 193-page PDF
  • 3 offline calculators, 7 editable example files
  • Read on day 39 of 90 (2026-08-25), language English

€29.90 Final price · EU consumers · PayPal

Buy direct: Nobody Opens a Passing Check Contents and preview →

Where “Buy direct” is shown, EU consumers can buy from Dargel Solutions and pay with PayPal. The displayed direct price is the final price: no added VAT or fees. The small business VAT exemption under section 19 of the German VAT Act applies. Some special territories are excluded; availability is checked at checkout. Gumroad ↗ remains available for business purchases, other locations and products offered only there. Gumroad is the seller for those purchases and shows any VAT and the final price before payment.

Quality principles

How we work.

Sources to check

Updated model references and selected central registration rules are linked to dated sources. Check the applicable requirements before use.

AI use disclosed

The products disclose their use of AI. Editorial responsibility: Adrian Verdan (Dargel Solutions); for the AI Starter, Dargel Solutions. Review by agents is not human review.

Honest previews

Each product page includes previews or a free practical exercise, so you can see what is inside before you buy.

Free knowledge

Check the essentials before you decide.

Our free overview explains how to register a Kleingewerbe in Germany, including typical costs, deadlines, and the small-business VAT thresholds, with direct links to official sources.

Registering a Kleingewerbe: steps, costs, and deadlines →

What one documented multi-agent run actually caught →

All knowledge articles →

Outlook

What comes next.

All four titles for sale are available in German and English — one product per language. The field report was first published in English; its German edition is Niemand öffnet einen grünen Check. More products are in the works.

Hear about new releases first: follow the imprint on Gumroad.