---
title: "About the app and who is behind it | Teilo"
description: "Teilo, the utility statement (Nebenkostenabrechnung) app for landlords in Germany, is offered by Patrick Engels-Kolodziej, a software architect in Berlin."
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> Index of every page on this site: [llms.txt](https://teilo-app.de/llms.txt)

# About Teilo

Teilo is an app for the utility statement (Nebenkostenabrechnung) that private landlords in Germany prepare once a year. It runs on iPhone, iPad, Mac and Android, needs no account and keeps all data on your device.

## Who is behind it

Teilo is offered by Patrick Engels-Kolodziej from Berlin, who is also the provider named in the [legal notice (Impressum)](https://teilo-app.de/impressum). He is a software architect. On his own website [pek.dev](https://pek.dev) he describes himself as a software architect for grown platforms, working in Berlin and remotely.

## What he is not

He is not a lawyer and not a tax adviser. Neither the app nor this website is legal advice. The calculation rules and the guides follow the wording of the German statutes and say where the wording leaves a question open. Your tenancy agreement may contain special terms the app does not know. For a particular case, a landlords’ association or a tenancy lawyer can help.

## How the rules are checked

Each calculation rule is assigned to a provision and was checked against its wording. The calculations were also compared with published worked examples and with an independent recalculation. What that shows, and what it does not, is described on the page [How we check](https://teilo-app.de/en/how-we-check).

## Contact

Address and email are in the [legal notice (Impressum)](https://teilo-app.de/impressum), which is available in German only.

As of 11.11.2026

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## Sitemap

See the full [sitemap](https://teilo-app.de/sitemap.md) for all pages.