Stack
What your system runs on, and what we work with
No black box. First the software we build a system for you on. Then the services we use ourselves to do the work, per task, including the ones we rent.
Your system on open source. Code and data yours. Everything exportable.
Why this page exists
As at 3 September 2026: for a set of functions we used to pay €325 a month to the usual providers. On our own servers the same functions cost us €59 a month.
That isn't down to hard bargaining. It's down to choosing open source for a system where we can, and putting that software on our own servers in the EU. What we rent as a service on top of that is listed by name below as well.
On 15 September 2026 we looked at thirteen agencies in our field: their public site, against three questions. None of them shows what their own site runs on. That is why it is here.
What your system runs on
The software we build a system for you on, and that we run ourselves too. Open source where we can, on our own servers in the EU.
Interface
2 tools
- Claude Codeactivebuilding and managing from the terminal
- Telegramactivealerts from our systems, and instructions to them
Applications
5 tools
- Twenty CRMactivethe client records, on our own server
- Documensoactivedigital signing, on our own server
- Ghostactivethe blog, on our own server
- Discourseactivethe community, on our own server
- Cal.diydiscontinueda booking page on our own server
Orchestration and AI
5 tools
- n8nactivethe work between systems, on our own server
- Claude APIactivethe language model behind our automations
- Kimiactivea second language model, for assessing and scoring
- Grokactivea third language model, as a check on the other two
- n8n Clouddiscontinuedthe hosted version of n8n, replaced by our own server
Security
2 tools
- Bitwardenactivepasswords and access for the team
- Cloudflare Turnstileactiveprotecting forms against bots
Infrastructure
4 tools
- Hetzneractive5 own servers, in Germany and Finland
- Coolifyactiveputting our software on the servers and keeping it up to date
- Dockeractiveevery application in its own container
- Supabaseactivethe database behind our systems
Web and DNS
4 tools
- Astroactivethe site, as ordinary files
- Cloudflare Pagesactivehosting for the site and the client portal
- Cloudflare DNSactiveour domains
- Cloudflare Streamactivethe webinar video
What we work with
Not everything we work with is open source or sits on our own servers. These are the services we use ourselves to do the work, per task, including the ones we rent.
Finding and following up clients
5 tools
- GoHighLevelactiveCRM, calendar and bookings, funnels
- Instantlyactivecold email, separate from our own domain
- Rinkelactivebusiness telephony
- Metaactiveads on Facebook and Instagram
- KvK-APIactivecompany data from the Dutch Business Register
Measuring what AI and Google say about a business
5 tools
- SerpApiactiveGoogle search results
- Firecrawlactivereading websites the way a machine reads them
- Google Search Consoleactivehow a site stands in Google
- PageSpeed Insightsactivehow fast a site loads
- Google Analyticsactivevisits to our own site
Mail, calendar and administration
4 tools
- Google Workspaceactivemail, calendar and documents
- Moneybirdactiveaccounting, invoices and payment by iDEAL
- Fathomactivenotes of conversations
- Jorttdiscontinuedaccounting, replaced by Moneybird
Code and mail
3 tools
- GitHubactivethe code and every version of it
- Scalewayactivethe mail of our client portal
- PDFShiftdiscontinuedmaking PDFs in an automation
Images and video
4 tools
- Canvaactiveimages for the site and social media
- Loomactiveshort explainer videos
- Falactiveshort video clips made with AI
- Pexelsactiveroyalty-free photos
The six it runs on
What sits under the bonnet
Six of these tools do the work you would notice day to day. Below is what each one does and what it means for you.
Client management
For a client system we build the client records in Twenty CRM, and we run it ourselves too: our automations write the contacts into it. The software is free and sits on our own server, so you don't pay per employee the way you do with the common alternative. There the bill climbs with every colleague who joins. For you that means this: grow from three people to thirty and your monthly figure doesn't change, and move to another party tomorrow and the whole client list simply comes with you.
Digital signatures
We sign quotes and contracts digitally with Documenso, on our own server. The most widely used option charges per document or per user; this one costs us nothing per signature. For you that means you can have a contract signed without stopping to think what that one extra signature costs, and that the signed document stays on a server in the EU rather than with an American provider.
Website
This site is built with Astro. That isn't a kit you pay a monthly fee for, but a tool that produces ordinary files: the page you are reading now was finished before you asked for it. That makes it load fast, and fast loading is exactly what Google and AI systems reward. For you that means your site is yours, as files you can take with you, rather than a rental from a website builder.
Automation
The work between your systems runs through n8n. Think of a request that becomes a task, or an invoice that goes out on its own. This runs on our own server. For you that means an extra automation isn't an extra subscription, and that nobody sends your business data past a server outside the EU to turn it into a task.
Database
The data behind the systems sits in Supabase. A database is no more than the place where everything is kept: names, appointments, amounts. This one is open source, which means anyone can check how it works and that we can put it on our own server the moment that is needed. For you that means your data is exportable and stays that way, even if we aren't here tomorrow.
Hosting
The site itself sits with Cloudflare Pages, and that costs nothing. Hosting is where your website physically lives; this one also makes sure visitors from the Netherlands get it from a nearby data centre rather than from the other side of the world. For you that means a site that is fast everywhere, with no monthly fee, and without being tied to one supplier: the files are with you as well.
The software of these six costs us €0 a month in total: four are open source, two run on their provider's free tier. What we do pay for is the server underneath. What is yours if you stop is set out with our pricing.
Curious what your own stack costs?
We'll look at it together: what you run, what it costs per month, and where two tools do the same job. Or read first why we chose this, with the same question for your own business.