My Retirement Countdown Build: 19 Games And An AI Coding Agent

🔍 Read the full analysis: My Retirement Countdown Build: 19 Games And An AI Coding Agent on ThorstenMeyerAI.com

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Thorsten Meyer says he built Altersteilzeit, a free web app for people counting down to partial retirement in Germany, in five days with help from Claude Opus 5.5, an AI coding agent. The published app combines a working-day countdown, a short animated film and 19 3D games; Meyer says he directed the project, made product decisions and approved releases.

Meyer’s account on ThorstenMeyerAI.com says the project began on Monday, September 28, 2026, as a request for a one-minute animated film about the working and non-working phases of Altersteilzeit in the block model. He says the app was online by Friday, October 2. All 24 commits were co-authored by the coding agent, according to Meyer.

Users enter a date marking the start of either phase and choose a model from 1:1 to 5:5. The app calculates the other date and remaining working days, accounting for weekdays, public holidays in the selected German federal state and leave entered by the user. Its daily screen also includes milestones and a saying of the day; other features include calendar exports, a printable countdown calendar and a bridge-day finder.

The site’s other elements include an animated film about the two phases, a game collection Meyer describes as having 19 modes, badges and a team countdown. The project account describes seven languages and five German dialects, with narrated audio. Meyer says the app has no accounts, cookies or tracking, and calculates dates in the browser. Shared dates are placed after the “#” in a web address, he says, so they are not sent to the server in a standard browser request.

What the Five-Day Build Involved

The account offers a concrete example of how an AI coding agent was used on a small public software project, beyond generating a demonstration or a single feature. Meyer says the agent worked across browser-based 3D games, translations, narration, testing and deployment. He reports a codebase of about 18,000 lines of JavaScript and Python, 15 test scripts, 1,224 voice clips and 17 sound effects.

Those figures come from the project’s creator and have not been independently verified in the material provided. Even with that caveat, the division of work described is relevant to readers following AI-assisted development: the agent performed substantial implementation and production tasks, while Meyer retained control of the app’s concept, tone, feature choices and publication approvals. The account does not establish that the same pace or output would apply to other projects.

The app also targets a specific practical need. People in an Altersteilzeit block model may spend years in an active work phase followed by a passive phase. A calendar-based countdown can make that schedule easier to track, while the game and film features turn the dates into an experience rather than a bare number. Whether those additions are useful to users beyond the creator’s intended audience is not reported.

From Film Request to Countdown App

Altersteilzeit is a German arrangement for phased retirement. In the block model described by Meyer, a person works as usual during an active phase and is then released from work for a matching passive phase. A 4:4 arrangement, for example, means four years in each phase. The app is designed to count working days across that timetable rather than simply counting calendar days.

Meyer describes a rapid sequence of additions. On the first day, he says, the work expanded from the film to date entry, leave and working-day calculations, and game prototypes. The daily view and more games followed on the second day. The third brought additional games and a fix for an iPhone scrolling problem; narration and sound effects were added on the fourth. Meyer says he approved the release on day five, after which the project gained German dialect options.

The games use calendar time as their structure, according to the account: months and weeks form a maze, while working days and quarters shape other game mechanics. Meyer says the collection contains 19 games; an earlier description in the project account refers to 15 modes, so the precise distinction between games and modes is not fully explained.

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

— Thorsten Meyer, project creator

Independent Checks and User Data

The project details are based on Meyer’s own account. The material provided does not include independent testing of the app, its code, the reported development figures, or the claimed privacy behavior. It also does not report user numbers, feedback, operating costs or whether the app has been reviewed for accessibility.

There is a small discrepancy in how the games are counted: the account first describes a game with 19 ways to play, later refers to 15 modes, and then says the collection contains 19 games. It is unclear whether some counts refer to modes within a smaller number of games or to different versions of the project. Meyer’s description of the languages also shifts from seven languages to twelve-language audio production; the material does not clarify which languages are available across every part of the site.

The privacy description is also a claim by the creator, not an independent audit. Meyer says dates in shared links sit after the “#” fragment and are not sent in standard browser requests, but the source material does not provide a technical review of the site or specify what other server-side information may be logged.

The App After Its Launch

Meyer’s article documents a release already made public by October 2, 2026, rather than announcing a future launch date. The account, published October 13, does not set out a product roadmap, scheduled update or plan for ongoing maintenance. It is not clear whether the app will receive new features or how bug reports and user feedback will be handled.

For readers considering the tool, the immediate next step is to inspect the live app and its privacy and legal pages directly, rather than treating the creator’s description as an independent assessment. Any later reporting would need confirmation of the app’s current features, its language and game counts, and how it performs across devices and German state holiday calendars.

Key Questions

What is Altersteilzeit?

Altersteilzeit is a German partial-retirement arrangement. In the block model described by Meyer, a person works during an active phase and then has a passive phase away from work, often for the same length of time.

What does the countdown app calculate?

Users enter the start date of one phase and choose a schedule from 1:1 to 5:5. According to Meyer, the app calculates the other date and remaining working days, taking account of weekdays, selected state public holidays and entered leave.

What did the AI coding agent contribute?

Meyer says Claude Opus 5.5 helped with coding, tests, translations, voice clips, sound effects, screenshots and deployment. He says he supplied direction, made decisions and approved releases; these details are reported by the project creator.

Is the app independently verified as private?

No independent privacy review is included in the source material. Meyer says the app has no accounts, cookies or tracking and performs calculations in the browser, but those claims have not been independently confirmed here.

Why do sources mention both 15 and 19 games?

The project account describes 19 ways to play, later mentions 15 modes, and also calls the collection 19 games. It does not explain whether those numbers count game titles, modes or different development stages.

Source: ThorstenMeyerAI.com