ROI index s.r.o.

ROI index is an independent digital marketing agency based in Slovakia, helping businesses attract customers, improve advertising performance and strengthen their visibility across search engines and AI platforms.

Founded and led by Miloš Vargic, a marketing professional with over 22 years of experience, the agency brings a business-focused approach to digital growth. We start with what a client needs to achieve, then connect strategy, campaigns and measurement to those goals.

Our services include Google Ads, Meta Ads, Microsoft Ads, LinkedIn advertising, SEO, email marketing and analytics. We also help businesses assess and improve their AI visibility—how their brands appear in answers from platforms such as ChatGPT, Gemini and Perplexity—through audits, monitoring and GEO strategies.

We work with e-commerce brands, B2B companies and service providers across European and international markets. For agencies seeking additional expertise, we offer white-label marketing support while keeping account and data ownership with the agency or client.

Our approach combines direct communication, clear reporting and ongoing optimisation. From conversion tracking to campaign management, we focus on understanding what generates qualified enquiries, sales and lasting business value.