walkerOS by elbwalker
Open-source event collection you run as code, from a Hamburg team that also sells fixed-price implementation packages
Quick Overview
| Company | elbwalker GmbH |
|---|---|
| Category | Server-Side Tagging and Tag Management |
| Headquarters | Hamburg, Germany |
| Founded | Not stated |
| EU Presence | Yes - Germany (EU) |
| Data Location | Self-hosted by the user; optional hosted app, location not checked |
| Open Source | MIT |
| GDPR Compliant | Yes |
| Self-Hosting | Yes, runs on your own infrastructure |
| Main Features | Browser, dataLayer and HTTP sources, transformers, collector with consent, destinations such as GA4 and BigQuery, config-as-code, MCP, Storybook addon |
| Pricing | Software free (MIT); fixed-price services Starter €5,000, Professional €10,000, Enterprise from €20,000; support €600 to €2,400 per month; consulting call €399 |
| Best For | Engineering-led teams that want tracking in version control instead of a click-based tag manager |
| Replaces | Google Tag Manager and server-side GTM stacks |
Detailed Review
walkerOS takes a different route from the hosting vendors. Sources collect events from the DOM, the dataLayer or HTTP, a collector applies consent and enrichment, and destinations such as GA4 or a warehouse receive the result, all defined in code.
The company behind it is elbwalker GmbH, Gerhofstraße 1-3, 20354 Hamburg, registered at Amtsgericht Hamburg under HRB 156985. The services page says the team has implemented first-party tracking infrastructures since 2018.
Tracking as Code
Components are tagged with data attributes, so a tagged component is tracked on every page that uses it, and changes go through version control and review. The documentation calls it self-hostable and MIT licensed, with no vendor lock-in.
There is no visual container editor as in Google Tag Manager, so marketers depend on developers or on the optional hosted app.
Paid Help Around Free Software
Revenue appears to come from services. The Starter package costs €5,000 for one website and two destinations in two weeks, Professional €10,000 for up to two sites and 25 events, and Enterprise starts at €20,000. Monthly support packages run from €600 for 5 hours to €2,400 for 20 hours, and a two-hour consulting call costs €399.
These are fixed figures from the services page.
Who Gets Value
Teams with a custom-built app and an analytics engineer will see most use. A team without developers is better served by one of the hosted tag managers in this group.
Limitations to Consider
Not a drop-in replacement for non-technical marketers, with no hosting location stated for the optional hosted app and no free hosted plan found on the pages read. Services are priced at project level. Not seen: the review rests on the vendor's public pages, not on a hands-on test.
Who Should Use walkerOS by elbwalker
Analytics engineers and product teams that want an auditable, code-first tracking pipeline.
Pros and Cons
Pros
- MIT licence with no restrictions stated
- Config-as-code with review in version control
- Self-hostable
- Named company with Hamburg register entry
- Fixed-price implementation packages
Cons
- Needs developers
- Implementation packages start at €5,000
- No visual container editor
- Hosted app details not checked
Alternatives to walkerOS by elbwalker
Other European server-side tagging and tag management worth comparing before you decide:
Addingwell
France · Managed server-side GTM hosting with consent data attached to events
TAGGRS
Netherlands · Dutch sGTM hosting on its own server network, ISO 27001 certified
Measurebase
Netherlands · Amsterdam-hosted sGTM with nightly tracking audits and flat plans
JENTIS
Austria · Viennese hybrid tag manager that runs client and server tags together
See all European server-side tagging and tag management or compare them directly against Google Tag Manager and server-side GTM stacks on our alternatives page.
Frequently Asked Questions
The software is MIT licensed and free. elbwalker earns from services: fixed-price packages from €5,000, monthly support from €600 and a €399 consulting call.
The documentation positions it as a replacement for a duct-taped GA4 and server-side tag manager stack, using code instead of a visual editor.
elbwalker GmbH, Hamburg, registered at Amtsgericht Hamburg under HRB 156985.