How Nineteen Games Became Part Of My Retirement Countdown

🔍 Read the full analysis: How Nineteen Games Became Part Of My Retirement Countdown on ThorstenMeyerAI.com

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Developer Thorsten Meyer says he and the AI coding agent Claude Opus 5.5 built Altersteilzeit, a free web app for counting down the working days to partial retirement in Germany, over five days. What began on September 28, 2026, as a request for a one-minute animated film had expanded by October 2 into a countdown site with 19 3D games, a narrated film, language options and planning tools.

In an account published October 13 on ThorstenMeyerAI.com, Meyer describes the app as a tool for people using the Altersteilzeit block model. Users enter the start date of either their active or passive phase and choose a model ranging from 1:1 to 5:5. The app calculates the corresponding date and remaining working days, accounting for weekdays, public holidays in the user’s German federal state and entered leave, he says.

The site brings the countdown into three main experiences: a daily view with milestones and a progress ring, a short film about the user’s two retirement phases, and games that turn the active years into levels. Other features include calendar exports, a printable countdown calendar, a bridge-day finder, badges and a team countdown. Meyer says the games use calendar time as their structure: for example, game boards can map columns to months and rows to weeks.

Meyer describes the development as a cycle in which he gave instructions, reviewed the agent’s work and chose whether to approve it. He says the project involved 24 commits co-authored by Claude Opus 5.5, about 18,000 lines of JavaScript and Python, and 15 test scripts. He also says the app has no accounts, cookies or tracking, and performs its calculations in the browser. These details are reported by Meyer; the source account does not include an independent technical audit.

A Countdown Built Around Personal Time

The project offers a concrete example of how an individual developer says an AI coding agent helped turn a narrow software request into a broader public product. Its reported scope includes interactive games, multilingual text and audio, alongside date calculations and planning tools. The account also makes clear that the work was not described as autonomous: Meyer says he set the tone and feature direction, assessed choices such as voices and dialects, and approved the releases.

For readers approaching retirement, the app’s appeal is practical as well as playful. It is designed to translate a long span of employment into working days, milestones and personal leave planning. Whether its calculations and privacy practices perform as described is a separate question from the development account and is not independently established by the material provided.

From One-Minute Film to Web App

Altersteilzeit is a German partial-retirement arrangement. In the block model described by Meyer, a person works as usual during an active phase and is then released from work for a corresponding passive phase. A 4:4 arrangement, for example, pairs four years of active work with four years away from work. The app is aimed at people who want to track the working days remaining in that process.

Meyer dates the initial request to Monday, September 28, and says the site was online by that evening. Over the next four days, he added language support, the daily view, games, badges, a bridge-day finder and narrated audio. The initial account describes seven languages, later expanded with five German dialects; it also says the narrator was available in 12 languages. The article refers to 19 games in its introduction, while its development timeline describes 15 game modes, so those counts may refer to different ways of grouping the game content.

“The interesting part is not how much an AI agent can build, but what was still left for me to do.”

— Thorsten Meyer, describing the project

Independent Checks Are Not Included

The source is Meyer’s account of his own project. It does not provide an independent review of the app’s date calculations, accessibility, privacy claims or security, nor user numbers or evidence of how the app performs across devices. The article also gives different counts for the game offering—19 games in one description and 15 modes in the timeline—without explaining how those figures relate. It is not clear from the account whether the app will receive continuing maintenance or how often its holiday data will be updated.

The App’s Next Chapter

Meyer’s account records his approval of the app and its release as a public website by October 2, 2026. It does not announce a future release date, roadmap or new features. Readers considering the tool can visit the site and check its calculations against their own dates and applicable state holidays; any later changes or verification of the reported technical details remain unreported in the material provided.

Key Questions

What is Altersteilzeit?

Altersteilzeit is a form of partial retirement in Germany. In the block model described by Meyer, an active work phase is followed by a passive phase away from work.

What does the app calculate?

According to Meyer, users enter the start date of one phase and choose a model. The app calculates the other date and the remaining working days, taking weekdays, German state public holidays and entered leave into account.

What does the app include besides a countdown?

Meyer says it includes a narrated film, 19 3D games, calendar and print features, a bridge-day finder, badges and a team countdown. His account separately describes 15 game modes.

How was the app developed?

Meyer says he directed the project and made decisions while Claude Opus 5.5 handled coding, testing and production tasks. He says he reviewed the work and approved releases; the account does not include independent verification of the development metrics.

Source: ThorstenMeyerAI.com