Can AI Help You Build Something Fun? My Countdown Has 19 Games

🔍 Read the full analysis: Can AI Help You Build Something Fun? My Countdown Has 19 Games on ThorstenMeyerAI.com

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Developer Thorsten Meyer says an AI coding agent helped him build and publish Altersteilzeit, a free countdown app for people tracking a German partial-retirement schedule, over five days. What began as a request for a short animated film expanded into a site with a daily working-day counter, multilingual narration and 19 browser games; Meyer says he directed the work, made product decisions and approved releases.

Meyer recounted the project in an article published on ThorstenMeyerAI.com on October 13, 2026. He said he began on Monday, September 28, asking an AI coding agent to make a short film about the two phases of Altersteilzeit, a partial-retirement arrangement. In its block model, a person works as usual during an active phase and is then released from work for a matching period. Meyer used a four-years-on, four-years-off model as an example.

The resulting app asks users to enter the start date of either phase and choose a model from 1:1 to 5:5. It calculates the other date and counts working days, accounting for weekdays, public holidays in the selected German state and entered leave, according to Meyer. The site also offers a daily countdown, milestones, a short narrated film, calendar exports, a printable calendar, a bridge-day finder, badges and a team countdown.

Meyer says the project had 19 games by the time he described it. Each maps calendar time to play: examples include a maze organized by months and weeks, a stacking game in which rows represent working weeks, and a night-shift game that treats each night as a month. His account says all 24 project commits were co-authored by Claude Opus 5.5. It also describes about 18,000 lines of JavaScript and Python, 15 test scripts and 1,224 voice clips produced across 12 languages. These figures are the developer’s account, not an independent audit.

What the Five-Day Build Shows

The project offers a concrete example of an AI coding agent being used across more than code generation. Meyer’s account describes the agent helping with feature development, testing, translations, audio production and deployment. That breadth may interest developers weighing whether agent tools can assist with a small public-facing product from initial concept through release.

The account also makes clear that speed did not mean the work was fully autonomous. Meyer says he supplied the concept and tone, chose voices and dialects, reviewed the legal-page contact details, listened to the output and approved the releases. Those choices shaped the user experience and the final product. The project is best read as a developer-and-agent collaboration, rather than evidence that an agent independently designed and launched a product.

The app’s subject gives the build a practical audience: people who want to track a work-to-retirement schedule in working days rather than calendar days. Meyer says its calculations run in the browser and that it has no accounts, cookies or tracking. Those privacy and usability details are part of the developer’s description; the source does not provide an independent technical or privacy review.

From Film Request to Countdown Site

The initial request was narrower than the final app. On September 28, Meyer asked for a short animated film counting down the working days of an Altersteilzeit arrangement. By Friday, October 2, he says the project had become a public web app with a daily view, the film and a game collection. His article describes development across five days and 24 commits, with the agent listed as co-author on each commit.

Meyer describes a repeated workflow: he gave a short instruction, the agent drafted a plan, implemented and tested a feature, recorded what it had done, and deployed it. The work included expanding the game prototypes into a level-based experience and adding languages, dialects, narration and sound effects. He says the app has seven standard languages and five German dialects, and elsewhere reports voice production across 12 languages.

The site is designed around the user’s calendar. In the games, weeks, months, holidays and leave become parts of the play mechanics. Meyer also says shared dates are stored after the “#” symbol in a web address, which browsers do not send to a server. The article describes this as a privacy design choice, but does not offer an external assessment of how every feature handles data.

“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 in his October 13 article

What the Project Account Does Not Verify

The figures for commits, code, tests, translations and voice clips come from Meyer’s own account. The article does not include an independent review of the code, an audit of the claimed privacy protections, or testing results showing how the app performs across devices and browsers. It also does not report user numbers, feedback or evidence of how widely the site is being used.

The source says the game collection has 19 games, but also refers to the game being playable in fifteen modes. It does not explain whether those modes are configurations within the 19 games or a separate count. The article reports seven languages and five German dialects, as well as voice production in 12 languages, but does not fully clarify how those categories map to every part of the app.

The article names Claude Opus 5.5 as the coding agent and says it co-authored every commit. It does not provide a comparison with a human-only development process, an independent assessment of the agent’s contribution or evidence that the reported five-day timeline would generalize to other projects.

The App’s Next Public Test

Meyer’s October 13 account describes Altersteilzeit as a public website and says he approved the release on the fifth day. The source does not announce a later release date, a formal testing program or planned new features. The next useful developments for readers would be evidence of how people use the app, corrections or updates to its working-day calculations, and further detail on its privacy practices and language coverage.

For now, the project stands as one developer’s documented account of building a small web product with an AI coding agent. Its practical value will depend on whether the date calculations and features work reliably for users, while its wider significance depends on whether other developers can reproduce a similar workflow beyond this single example.

Key Questions

What is Altersteilzeit?

Altersteilzeit is a form of partial retirement described in Meyer’s article. In the block model, a person works during an active phase and is then released from work for a matching period.

What does the app do?

Users enter a phase start date and choose a model. The app calculates the other date and counts working days, while also offering a daily countdown, milestones, a narrated film, calendar tools and 19 games, according to Meyer.

How much of the app did the AI build?

Meyer says the agent helped with coding, testing, translations, voice clips, sound effects and deployment. He also says he set the direction, made key product decisions and approved releases. The article does not independently measure the agent’s share of the work.

Is the app independently verified as private?

No independent privacy audit is included in the source. Meyer says the app has no accounts, cookies or tracking and calculates data in the browser; those are claims in his project account, not independently verified findings.

Source: ThorstenMeyerAI.com