Service D · Web & software
Websites, web apps and business software – fast to load, accessible, bilingual and with tests that check every formula against reference values.
01What we build
01
Sites that load fast, get found and are easy to maintain.
02
Tools for processes that live on paper or in spreadsheets today – in the browser and as an app.
03
Connections to existing systems, hosting and monitoring – so it keeps running after launch.
02Measurably fast
We measure how long it takes until the main content of a page is visible (Largest Contentful Paint). Our own products are under a second on desktop and just under three seconds on a phone with throttled 4G – both figures are shown here. And this page is measuring itself in the footer right now.
↓ Measured live: see footer
Rechnerzentrale
Aphantasie
Lighthouse, median of 3 runs, 30 Sep 2026
03Quality
01
At Rechnerzentrale every formula is tested against official reference values before it goes online.
02
Keyboard use, contrast, screen readers – to WCAG 2.2 AA, as required by the European Accessibility Act.
03
German and English with clean language versions – for search engines and people.
04
Structured data, fast pages and clear content that AI assistants can cite.
04Technology
We choose technology by task. Our default is a stack that lets us deliver quickly and safely.
05Work
Client project · 0 third-party servers
Employees see within a minute what remains of their severance pay after tax and when the money arrives – with every calculation step, as a link for advice sessions and as a print PDF.
Client project
213 calculators · DE/EN
213 calculators for tax, benefits and everyday life – every formula tested against official reference values before it goes live. Our own product.
Own product
Client project · 5 days
A paper form for fall-protection equipment became an app: a QR code per device, guided inspection, signature and a PDF with an inspection badge.
Client project
06Process
01
Clarify goal, scope and constraints – 30 minutes, free.
02
Fixed price for the agreed scope, with a schedule.
03
A clickable version after a few days instead of weeks of layout PDFs.
04
Development with tests, accessibility and a load-time budget.
05
Go-live, monitoring and further development as needed.
07Formats
from €2,900
Up to about eight pages, fast, accessible, with search fundamentals.
from €6,900 · fixed price per stage
From prototype to production – e.g. digital inspection records.
from €490
Technology, content and structured data reviewed, with a prioritised list.
from €59 / month
Hosting, updates, monitoring and small changes.
08Fragen
A company website with a clear scope is often ready within a few weeks, a first clickable version usually after a few days. We set the schedule in the quote.
Yes. Depending on your needs via a CMS or simple content files – we show you both and recommend what suits your team.
We run websites and applications on servers in Germany and choose EU regions for databases. Details are in the quote and the data processing agreement.
Yes – for maintenance, accessibility, load time or a relaunch. We review what exists first and tell you honestly whether to rebuild or refactor.
Describe the process that costs time today. In the intro call we sketch what a solution could look like – and what it costs.
