In February 2025, Andrej Karpathy, a co-founder of OpenAI and former head of AI at Tesla, posted a short note about a new way of programming. He called it “vibe coding”: you tell an AI what you want and almost forget that the code even exists. Nine months later, Collins Dictionary named “vibe coding” its Word of the Year 2025. A throwaway remark became a discipline, and today websites, bots and first versions of apps get built this way.
For a business, though, the question isn’t whether vibe coding is fashionable. It’s when it saves you money and when it ends up costing you more.
What it looks like in practice
Instead of writing every line by hand, the developer describes to the AI what the application should do, and the AI proposes the code. The developer tests the result, refines the instructions and fits the pieces together. A first working version can appear in days rather than weeks.
With us, it goes roughly like this. First we clarify with you what the app should solve and for whom. Then we quickly build a prototype you can click through and tell us what works and what doesn’t. Only then comes the part the AI can’t do on its own: security review, data handling, testing, deployment to a server and handover.
When AI development pays off
It makes the most sense where you need to validate something quickly or solve a specific operational problem:
- A first version of a product (MVP) to take to your first customers or investors.
- Internal tools such as order dashboards, a simple CRM or forms that replace Excel spreadsheets.
- Websites, landing pages and bots, where the brief is clear and the scope is manageable.
- Automation, for example connecting two systems that haven’t talked to each other so far.
In all these cases, speed is the main value. If the idea doesn’t work out, you haven’t paid for six months of development.
Where you need to slow down
Data from the last two years shows why it isn’t enough to simply “let the AI work”. In 2025, Veracode tested more than 100 language models on 80 coding tasks, and in 45% of cases the generated code contained a security flaw from the OWASP Top 10. When it came to protecting against cross-site scripting, the models failed 86% of the time.
A July 2025 study by METR is just as interesting. Experienced developers using AI tools took 19% longer to complete real tasks, even though they themselves felt they had been 20% faster. So AI doesn’t speed everything up, and on complex, long-lived codebases it can even slow work down.
Developers themselves see it similarly. In the Stack Overflow 2025 survey, 84% of developers said they use or plan to use AI tools. Yet only 33% trust the accuracy of their output, and 46% distrust it. Two thirds are most frustrated by solutions that are “almost right, but not quite”. And 72% of respondents don’t use vibe coding at work at all.
So be especially careful with apps that handle payments, health data or other sensitive personal data, with large systems that have a long history, and anywhere a mistake means a legal or financial problem. AI can be used there too, but with much more thorough review.
Why we do AI development under human control
All these numbers lead to a simple conclusion. AI is an excellent, fast assistant, but it needs someone who understands what is being built. On every project, we therefore check security, GDPR-compliant handling of personal data, performance, and whether the app does exactly what you ordered. After handover, the code and all access belong to you.
What it costs
A first version of an app with us starts at CZK 100,000, and we set the price individually based on scope. If you don’t yet know whether your idea can be built and what it would involve, start with a consultation from CZK 2,500 per hour. We’ll go through the brief, propose an approach and tell you straight whether AI development makes sense in your case.
Describe your idea and we’ll get back to you.
Sources: Collins Dictionary – Word of the Year 2025, Veracode – 2025 GenAI Code Security Report, InfoWorld – METR study, Stack Overflow Developer Survey 2025 – AI.