Building A Retirement Countdown With AI: The Iterations And Games

🔍 Read the full analysis: Building A Retirement Countdown With AI: The Iterations And Games on ThorstenMeyerAI.com

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Thorsten Meyer says he developed and published Altersteilzeit, a free web app for people counting down to partial retirement in Germany, in five days with help from an AI coding agent. The project grew from a request for a one-minute animated film into a site with a working-day countdown, a narrated film and games; Meyer says he set the direction, made decisions and approved releases.

Meyer’s account, published on ThorstenMeyerAI.com on October 13, says he began on September 28, 2026, by asking the agent to make a short film about the block model of Altersteilzeit. In that arrangement, a person works during an active phase and is then released from work for a matching passive phase. A four-to-four model, for example, means four years in each phase.

The finished app asks users to enter the start date of either phase and choose a model from one-to-one to five-to-five. It then calculates the other date and the remaining working days, accounting for weekdays, public holidays in the selected German state and entered leave, according to Meyer. The daily view includes milestones, a progress display and a saying of the day. Other features include calendar exports, a printable calendar and a finder for bridge days that may extend breaks.

Meyer’s account describes a film following the two phases and a set of games that map calendar time to play. He says the project ultimately included 19 3D games, a narrator in 12 languages and seven languages plus five German dialects across the site. The article also says all 24 project commits were co-authored by Claude Opus 5.5. Meyer describes himself as the person who gave instructions, made product choices and approved releases.

A Countdown Built Around Working Time

The app turns a date calculation into a recurring personal countdown, combining a practical estimate of working days with entertainment and planning tools. That matters to its intended users because the block model stretches across years: milestones, leave planning and a daily view give the countdown uses beyond displaying a final date. The app’s calculations also depend on personal inputs, including the relevant German state, selected work pattern and leave.

The project is also a concrete account of how Meyer used an AI agent in software production. He attributes engineering, testing, language work and media generation to the agent, while retaining decisions about the concept, tone, voices and publication. His account is a description from the project’s creator, not an independent assessment of the app’s accuracy, usability or development cost. It offers a case study in human-directed AI development, but does not establish how quickly or reliably another team could produce a similar service.

Meyer says privacy shaped the design: there are no accounts, cookies or tracking, and calculations run in the browser. He also says shared dates are placed after the “#” in a web address, which browsers do not send to a server in the usual request. Those design details may matter to people entering sensitive work and retirement dates, though the source does not provide an independent privacy review.

From Film Request to Public App

The initial brief was deliberately narrow: make a one-minute animated film about the active and passive phases of German Altersteilzeit. Meyer says the work expanded over five days, with successive additions including date calculations, game prototypes, multilingual support, narration and sound. The app was online by the first day, according to his timeline, with more features added and approved through October 2.

Meyer describes the development cycle as short instructions followed by a plan from the agent, implementation, testing and a record of the work. He says larger tasks were split among parallel sub-agents, including translation work. The account lists roughly 18,000 lines of JavaScript and Python, 15 test scripts, 1,224 voice clips and 17 sound effects. These figures are reported by Meyer; the source does not include an outside audit of the code or generated assets.

The app’s game design uses calendar units as mechanics: for example, Meyer says maze columns represent months and cells represent weeks, while a game called Calendar Stack uses working weeks and public holidays in its rules. The article describes this as a way to connect play directly to the user’s countdown rather than treating the games as unrelated additions.

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

— Thorsten Meyer, writing on ThorstenMeyerAI.com

Independent Checks Are Not Provided

The account does not provide an independent review of the working-day calculations, privacy claims, accessibility, security or performance across devices. It also does not say how many people have used the public app, whether users have reported errors, or whether the project has ongoing maintenance plans. The number of game modes is described differently in the source: it refers to 19 games in one section and says the game was playable in 15 modes in another. The relationship between those counts is not explained.

Meyer describes the app as free and public, but the article does not specify its long-term hosting arrangements or whether features and language support will change. The source also does not give a cost comparison with conventional development or enough detail to verify the reported production figures independently.

Maintenance and User Feedback

Meyer’s article describes the app as already online and does not announce a future launch date or a specific next release. The immediate next step for readers interested in the project is to consult the public app and its legal pages, while checking that dates, holiday settings and leave inputs reflect their own circumstances. Because the source does not report independent testing, users should not treat its description as a third-party verification of the calculations.

Further reporting could establish how the app performs in use, whether its calculations have been checked against official calendars and how Meyer plans to handle updates. No user numbers, maintenance schedule or announced roadmap were included in the account.

Key Questions

What is Altersteilzeit?

Altersteilzeit is a German form of partial retirement. In the block model described by Meyer, a person works through an active phase and then has a passive phase away from work; a four-to-four arrangement has four years in each.

What does the app calculate?

Users enter the start date of one phase and select a model. The app calculates the other date and remaining working days, taking weekdays, public holidays in the selected German state and entered leave into account, according to Meyer.

How did AI contribute to the project?

Meyer says the AI coding agent helped with engineering, tests, translations, narration, sound effects and deployment. He says he supplied the direction, made product and creative decisions, and approved releases.

Does the app collect user data?

Meyer says the app has no accounts, cookies or tracking and performs calculations in the browser. He says shared dates are stored after the “#” in a URL. These are the creator’s descriptions; the source does not provide an independent privacy audit.

Has the app’s accuracy been independently verified?

The source does not report an independent review of the date calculations or privacy practices. It also provides no user figures, error reports or external testing results.

Source: ThorstenMeyerAI.com