# Add4

> Probe-verified (tier 2 of 3). Last checked 2026-08-23. 1 of 5 capability checks passed.

- host: www.add4.de
- url: https://www.add4.de/
- category: seo consulting
- type: business
- country: DE
- locations: Riesa, Germany
- language: de

## Probe-verified · tier 2 of 3

Probed live on 2026-08-23 against rubric v1. 1 of 5 checks passed.

- fail — Markdown negotiation
- fail — Markdown twin at a predictable URL
- PASS — llms.txt
- fail — API catalog
- fail — MCP server answers

## Unverified actions

Read from the page's own content, with the wording each was drawn from. Inference is kept separate from tested facts; an agent completing the action is tier 3.

- **contact** — "Direkter Kontakt Uwe Hofmann, Riesa, 03525 - 518 683"
- **book** — "Website-Analyse: 3.500 Euro netto"

## Summary

Add4 offers SEO consulting services including website analysis, prioritization plans, and active performance support with revenue sharing.

## Context

5 sites in this index share the category "seo consulting"; 3 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known-Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark