🔍 Read the full analysis: A Fresh Look In Two Days: Gewerkton’s Experiment With AI Agents on ThorstenMeyerAI.com

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Gewerkton, a construction-site documentation tool, says it replaced the look of its web and phone apps, Studio, icons and multilingual website with a design called HORIZON over 2–3 October 2026, using AI coding agents for implementation. Founder Thorsten Meyer approved the written plans, inspected results and released each part; the account comes from the publisher, which disclosed that it builds Gewerkton.

The reported work covered the web app, iPhone and Android app, Studio, 26 icons and a website with 529 pages in 40 languages. Gewerkton says the website was uploaded in 1,583 files without an error. Its phone app received version 0.5.0 in the new look, while Studio was updated for light and dark modes. The icons were re-rendered in Blender in cobalt and navy.

The website also received 228 AI film runs for five regions, 222 with regional versions, as well as eight help videos. The company says “two days” describes execution from an approved plan to the live website, not the start of design work: an interim draft dated 26 September was already available.

According to the account, agents worked in a separate code copy and branch. Meyer approved the plan and released each part after review. Films showing the redesigned interfaces were held until he had approved the screens, and paid film reruns also required his explicit approval. Apple’s program-license agreement presented another human gate: only Meyer could accept it, and the iPhone build was blocked until he did.

Human Review Caught Design Failures

The account illustrates a practical limit of AI-assisted software work: passing tests did not catch every visible defect. Meyer noticed that the first icon version’s white tiles covered nearby labels in dark mode. The fix combined image processing to make pale areas transparent, a separate dark-mode variant and a layout correction after a navigation style overrode the intended column. Gewerkton says the fix went live that evening.

There were also accessibility and media-quality checks. The original cobalt had a 4.38:1 contrast ratio against a light background, below Gewerkton’s stated 4.5:1 working standard under WCAG 2.1 AA. The color was darkened to reach 4.80:1. In the films, automated red-color masking missed red in shadows and warm backlighting. Visual review found examples that led to 24 files being cleaned and 10 regional versions temporarily replaced with the European cut; nine were later reshot with Meyer’s approval.

These details matter to teams considering agent-led development because they show the difference between generating changes and accepting them for release. In Gewerkton’s account, agents handled implementation, but decisions involving accessibility, visual quality, paid reruns and publishing remained subject to human review. The report is a company’s own account, not an independent evaluation of agent performance.

A Draft Preceded the Two-Day Build

Gewerkton is built in Iffeldorf, Bavaria, by Thorsten Meyer, who says he directs a fleet of AI coding agents using Codex and Claude. The publisher’s disclosure is relevant: it both develops the product and is reporting on the process. No outside auditor or customer assessment is cited in the supplied material.

The work began from an interim design draft dated 26 September. For the implementation, the written plan listed open choices, options and recommendations; Meyer says he approved the recommendations. The agents then worked on their own branch. The source describes a sequence of reviewed releases rather than one unattended instruction to redesign and publish the entire product.

Testing covered multiple sizes and languages. Gewerkton reports that the web app was checked across 200 views in English, German, Japanese and Hindi, at widths of 390, 834 and 1,440 pixels, in light and dark modes. It says the phone app passed 853 of 853 tests and Studio passed 2,158 of 2,158; the website passed seven test suites and was rechecked in a browser after upload across five regions.

““Two days” cover the execution, from the approved plan to the live website.”

— Thorsten Meyer and Gewerkton, in the publisher’s account

Test Results Leave Open Questions

The reported figures and outcomes come from Gewerkton’s publisher, which disclosed that it builds the product. The supplied account does not include an independent audit, outside user feedback or a comparison with a non-agent redesign. It also does not specify the full cost of the redesign: the only stated cost figure is about $134 in actual film costs, not a total project budget.

Not every test result was clean. Gewerkton reports eight failing web-app tests across seven files; six files failed in the same way on the main branch, while one failure depended on test order and passed when run alone. The company says the redesign did not cause those failures but did not fix them. The account does not provide enough detail to assess the tests independently.

Film generation was also uneven. Gewerkton says it paused production when 38 percent of jobs were failing, after 208 of 228 runs had been completed. It reports that later visual checks led to edits and reshoots, but does not give a final success rate for all attempts. The source also does not establish whether every regional version is now final.

Android Fixes Are Due in 0.5.1

Gewerkton says five major findings from testing on a Pixel 10a are scheduled for Android version 0.5.1; none was classified as a blocker. One issue involved camera-screen buttons breaking in the middle of words after the redesign increased type size and padding. The German cancel label now wraps onto two lines.

The account also says nine regional film versions were reshot after the visual review and passed checks. It does not give a release date for version 0.5.1 or say when all remaining regional film work will be complete. Those are the clearest next milestones identified in the report.

Key Questions

What did Gewerkton change?

Gewerkton says it applied the HORIZON design to its web and phone apps, Studio, 26 icons and a 529-page website available in 40 languages. The website also received region-specific AI film work and eight help videos.

Did the agents complete the redesign without human involvement?

No. According to the publisher, Thorsten Meyer approved the written plan, reviewed results and released each part. He also approved paid film reruns and handled an Apple license agreement that blocked the iPhone build.

Was the work completed from scratch in two days?

Not entirely. Gewerkton says the two days, 2–3 October 2026, covered implementation from an approved plan to the live website. An interim design draft had been prepared on 26 September.

What problems did the team report?

Human review found icon tiles that obscured labels in dark mode and film recoloring that missed red in shadows or warm light. The company also reported eight web-app test failures it said were not caused by the redesign, plus five major Android test findings scheduled for version 0.5.1.

How much did the redesign cost?

The source gives one cost figure: about $134 in actual film costs. It does not state a total project cost, including development time or other expenses.

Source: ThorstenMeyerAI.com