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Where AI has to earn its place

AI Integration Services

OpenAI and Claude wired into the features your users actually pay for, with cost, latency and safety handled before launch.

Fixed scope and price agreed up front. No obligation after the call.

  • You own 100% of the code
  • Fixed scope and price up front
  • Not happy after milestone one? Walk away, owe nothing
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What you get

  • Useful AI features built into your real product logic
  • OpenAI and Claude, chosen and tuned per task
  • Answers grounded in your own data, not guesswork
  • Guardrails, error handling, and cost controls built in
  • Fixed scope and fixed price agreed before we start
  • A direct line to the person building your product
[ 01 ]

What is AI integration for an app or web product?

AI integration means building models such as OpenAI and Claude into a new or existing app or web product, so it can draft content, answer questions from the company's own data, extract and classify information, or automate routine work. It is for product owners and businesses that want an AI feature their users rely on, with cost, response time and safety handled before launch. CompletApp is a Budapest-based product studio that delivers it in Hungarian and English, to a fixed scope and a fixed price.

The test we hold every feature to is simple: does it make the product better for the person using it. That is why the model goes into the real logic of your product rather than being bolted on for show.

An AI add-on that impresses in a demo and gathers dust in production is a gimmick. We build the other kind. By treating the model as one well-placed component inside thoughtful product logic, we deliver AI that is accurate enough to trust, fast enough to enjoy, and cheap enough to run at scale.

[ 02 ]

What we build

We build AI into the moments where it earns its place: assistants that answer from your own documents and data, generators that produce real, on-brand content, classifiers and extractors that turn messy input into structured data, and workflows that quietly automate the busywork. Three live products show the range. We wired OpenAI into the copy generation of Copywise, an AI copy generator now live as Persuva.ai. We set up the AI environment that the writing process of RankSpiral, an AI SEO content platform, runs on. And we built the AI-driven signal logic of PipTrend, a trading indicator for TradingView.

Every integration starts from the outcome: what should the user be able to do that they could not before. We design the feature around that, then choose the model, the prompts, and the supporting code to deliver it. If the product around the feature does not exist yet, we build that too, as web app development.

[ 03 ]

OpenAI or Claude: which model fits your product?

We work with both OpenAI and Claude and pick the right model for each job, balancing quality, speed, and cost. Just as important, we structure the integration so the model sits behind a clean boundary in your code. That means we can upgrade to a better or cheaper model later without tearing your product apart, so your AI stays current as the field moves.

[ 04 ]

How does an AI feature stay accurate and affordable?

AI that makes things up is worse than no AI at all. We ground responses in your real content using retrieval, so the model answers from your knowledge base and data rather than guessing. Reaching that data where it lives, in your database or the business system you already run, is backend development work, and we do it as part of the same project. We add guardrails, handle the awkward edge cases, and put caching and sensible limits in place so the feature stays accurate and the bill stays predictable as usage climbs.

If you are a Hungarian SME, part of an AI build can be funded from the DIMOP Plusz programme, since artificial intelligence is one of its target areas. What is eligible in your project comes out of a free pre-screening. The details are on grant-funded development.

[ 05 ]

How we work

We agree the full scope and a fixed price up front, then deliver in short, reviewable stages so you can see the AI working on real inputs early and steer it toward what your users need. You get a feature that holds up in production, not a clever proof of concept that falls over under load.

Process

A seamless 4-step journey

  1. 01

    Discover

    We dig into your goals, users, and market to define exactly what to build.

  2. 02

    Design

    High-end UI and UX, mapped and prototyped before a line of code is written.

  3. 03

    Build

    Rapid, iterative development with weekly previews you can actually click.

  4. 04

    Launch

    Testing, store submission, and a smooth, fully supported go-live.

Client voices

Trusted by founders

By far my best freelance experience ever! I will definitely hire him again! Janos did extra steps that he wouldn't have to do, but still did! Our communication was perfect! I could tell that he definitely knew what he is doing! Thanks a lot.

Hussein Al-Rammahi

MizanMe

Jani was the best possible choice for building our project. Cooperative, constructive and quick to understand how the business works, so we could count on Jani not only for the technical build but also for the extra ideas contributed along the way. Always available and flexible, and open to questions, requests for help or a quick catch-up at any time. That attitude and professional mindset made working together much easier. I recommend Jani wholeheartedly.
Read the full review

Antónia Oláh-Kovács

Entrepreneur

Translated from Hungarian

CompletApp transformed our business. We needed an app to launch quickly but did not have the in-house expertise, and they delivered a beautiful, functional app in just weeks.

Sarah T.

Marketing Director, FreshBite Foods

Fast, reliable, and easy to work with. As a startup founder I needed an app to demo to investors, and CompletApp delivered a sleek, responsive design that matched my vision perfectly.

David M.

Founder, FitForce

Exceeded all our expectations. We struggled for months to find the right team to bring our app idea to life, and CompletApp made it happen.

Emily J.

CEO, Bright Ideas Consulting

Amazing app development service. CompletApp helped us build an app that truly represents our brand.

James P.

Operations Manager, GreenTech Solutions

The perfect app for our business. We did not have the technical know-how to build an app ourselves, but CompletApp made the process so simple.

Laura R.

CTO, StyleSquad

Great template and support. I purchased the custom chat template for FlutterFlow and it has been a game changer.

Alex H.

FlutterFlow builder

Frequently asked questions

It means embedding models like OpenAI and Claude into the parts of your product where they create value: generating content, answering questions over your own data, classifying or extracting information, or automating work that used to need a human. The goal is a feature people use, not a badge that says AI.

Both, and we choose per task. We pick the model that gives the best quality, speed, and cost for each job, and we structure the code so we can switch or upgrade models later without rebuilding your product.

Yes. We build retrieval over your content so the model answers from your knowledge base, product data, or documents rather than guessing, which keeps responses accurate and grounded in your business.

We design prompts and guardrails carefully, handle errors and edge cases, and put sensible limits and caching in place so the feature stays predictable in quality and cost as usage grows.

We can. We integrate AI into products you already run, working with your current stack and adding the capability where it moves the needle, without forcing a rewrite.

Typical projects run from 3,400 to 5,500 EUR. The exact figure depends on the scope, so after a free discovery call you get a fixed price in writing before any work starts. No VAT is added to the price.

Ready to build it?

Book a free discovery call and get a clear scope, timeline, and fixed price.

Typical projects: 3,400 to 5,500 EUR Typical timeline: about 6 weeks Not sure what it would cost? Try the cost calculator

Get a fixed quote for your project

We reply within 24 hours. After one free call you get a written proposal with scope, timeline and a fixed price.

What happens after you write

  1. [ 01 ]

    We reply within 24 hours

  2. [ 02 ]

    Free 30 minute discovery call

  3. [ 03 ]

    Fixed scope and price in writing

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