TrollWall AI, a startup focused on moderating toxic and hateful content using artificial intelligence, has raised €800,000 to accelerate product development and expand internationally. The round was backed by Seed Starter of Slovenská sporiteľňa, Slovak Investment Holding (SIH), and angel investor Miroslav Fedor.
Already operating in more than 10 countries and supporting 12+ languages, the company is positioning itself as a scalable solution to one of the internet’s fastest-growing problems: toxic communication.
From crisis to product
The idea behind TrollWall AI wasn’t born in a lab — it came from real-world chaos. Founder and CEO Tomáš Halász was working as a social media manager during the early months of the war in Ukraine, helping the initiative “Kto pomôže Ukrajine.” The organization quickly became a target of massive waves of hate speech and disinformation. Manual moderation wasn’t just inefficient — it was unsustainable.
“Deleting comments manually was extremely exhausting — both mentally and time-wise. When I looked for a tool that could moderate Slovak-language hate speech, I realized nothing like that existed. So we decided to build it.”
What started as an internal tool quickly evolved into a product with clear market demand across companies, public institutions, and NGOs.
A different approach to AI moderation
While global players often rely on universal models, TrollWall AI is taking a localized approach. The startup trains AI models separately for each language and market, working with local linguists to better understand cultural nuance — a critical factor when identifying harmful content.
“Hate speech always has a cultural and geographical context. What’s offensive in one country might not even make sense in another,” says Halász.
This approach has become one of the company’s key competitive advantages, enabling higher accuracy and relevance across markets.
From moderation to full conversation management
TrollWall AI is no longer just a moderation tool — it’s evolving into a full-stack platform for managing online communication. In addition to filtering toxic content, the platform now offers: (1) conversation analytics, (2) engagement support, and (3) AI-assisted replies. Importantly, the company emphasizes human oversight.
“We don’t want fully autonomous AI making decisions. Our goal is to help people manage communication better, respond faster, and protect their brand — but the final decision should always stay with humans."
Customers range from presidents to brands
The need for safer online spaces cuts across industries — and TrollWall AI’s client base reflects that. Customers include: former Slovak president Zuzana Čaputová, Czech president Petr Pavel, football club AC Sparta Praha, or telecom operator O2 Slovakia.
Alongside public institutions, the platform is also used by corporations, NGOs, and organizations managing large-scale online communities. For investors, TrollWall AI sits at the intersection of strong market demand and societal impact.
“We invest in startups solving real problems with scalable potential. TrollWall AI does both — it addresses toxic online content, something virtually every brand and institution faces today.”
