“How much does a custom AI tool cost?” is a fair question with an annoying answer: it depends. A simple chatbot and a bespoke AI system that reads documents and makes decisions are wildly different projects. So here’s a practical breakdown of what drives the cost of custom AI and chatbots in 2026, and the typical ranges you can budget around.
The short answer
Most custom AI projects fall between €3,000 and €30,000+. A focused chatbot or a single AI-powered automation sits at the lower end; a bespoke AI tool integrated into your product or operations sits higher. As with any build, the number is driven by scope, not by the letters “AI.”
Typical cost ranges
- AI chatbot / assistant (€3,000 to €10,000): a trained chatbot for support or lead capture, connected to your content and tools.
- AI-powered automation (€4,000 to €15,000): AI slotted into a workflow, reading documents, drafting content, or classifying and routing requests.
- Custom AI tool or integration (€15,000+): a bespoke tool or an AI feature built into your own product or platform.
These are typical ranges to plan around, not fixed prices. A proof-of-concept can often be done for less to prove the value before you commit to the full build.
What drives the cost
Four factors matter most: complexity of the task (a FAQ bot vs a system that makes decisions), integrations (how many of your tools and data sources it needs to talk to), data (whether your data is clean and ready), and whether you need a custom model or can build on existing ones (usually the latter, which keeps costs down).
Buy, build, or integrate?
You don’t always need to build from scratch. Sometimes an off-the-shelf tool is enough; sometimes you just need existing AI models integrated into your workflow; sometimes a genuinely custom build is justified. The right call depends on how specific your needs are, and a good partner will tell you honestly when not to build. That’s usually where we start: what’s the cheapest way to get the outcome you want?
Frequently asked questions
Do I need a huge dataset?
No. Most projects build on existing AI models, so you rarely need a large dataset. We work with what you have.
How long does an AI project take?
A proof-of-concept can be a couple of weeks; a full build is typically a few weeks to a couple of months depending on scope.
What’s the difference between AI and automation?
Automation follows rules; AI adds judgement, reading and generating content. We combine both. See our automation service.
Will it work with our existing systems?
Yes, in most cases we integrate with the tools and data you already use rather than replacing them.
Related reading
Thinking about a custom AI tool?
TEJ builds custom AI tools and chatbots and business automation for brands and startups. Tell us the problem and we’ll come back with an approach and a fixed quote.