Zealos.ai

Zealos.ai positions itself as an AI-powered fact-checking tool with a twist: instead of relying on a single, general-purpose knowledge base, it lets users build custom knowledge bases from their own documents. This makes it a fundamentally different proposition from broad-spectrum fact-checkers like Google Fact Check Tools or Snopes. Zealos is not designed to verify claims against the open web or a pre-curated database of known falsehoods. Instead, it is built for scenarios where the ground truth is defined by a specific set of sources—your sources. For journalists, researchers, content creators, and compliance officers who need to check facts against internal documents, previous reporting, or regulatory guidelines, this approach offers a level of control and relevance that general-purpose tools cannot match. However, the tool’s usefulness is tightly bound to the quality and comprehensiveness of the knowledge base you create, and its current feature set has notable gaps that limit its utility for some core workflows.

The standout feature is undeniably the custom knowledge base. Users can upload PDFs, DOCX, DOC, and TXT files to create a searchable repository of trusted information. The fact-checking process then compares submitted text against this curated set of documents. This is powerful for an academic researcher who wants to verify citations against a library of uploaded papers, or for a journalist who has built a knowledge base from official reports and interviews. The ability to export results in various formats is a practical addition, allowing integration into reporting pipelines or content management systems. But the workflow has a critical limitation: you cannot upload a document directly into the fact-checking form. You must paste or type the text to be checked. This means that if your source material is a PDF or a long article, you have to extract the text manually before verification—a friction point that slows down the very process Zealos aims to accelerate.

Zealos’s pricing model reinforces its niche orientation. The free tier offers only 30 credits per month, a single project, a default AI model (GPT-4o Mini), and no shareable reports or full site scans. This is barely enough for one or two serious fact-checking sessions. The Academic plan at $9.99 per month increases credits to 600 and unlocks all AI models, but still lacks shareable reports and full site scans. The Pro plan at $25.99 per month is where the tool becomes fully functional: unlimited knowledge base entries, 1,000 credits, shareable reports, full site scans, and WordPress integration—though the latter is listed as “coming soon.” For professional fact-checkers or content teams, the Pro plan is essentially the entry point, making Zealos a paid tool for serious use. The free tier feels more like a trial than a usable product.

Who benefits most? Journalists and researchers who work with a defined set of sources will find the custom knowledge base transformative. Imagine a reporter covering a complex policy area: they can upload all relevant legislation, previous articles, and official statements, then check every new claim against that body of work. Similarly, a content creator maintaining brand consistency can upload style guides and approved references. Compliance officers can ensure marketing copy aligns with stored regulatory documents. But for users who need to verify claims against the open internet or rapidly changing news, Zealos is the wrong tool. Its strength is depth, not breadth.

The tool’s limitations are not just about pricing or missing integrations. The fact-checking process itself is opaque: users select an AI model (on paid plans), submit text, and receive a verdict, but there is little transparency about how the model weighs evidence or handles conflicting information in the knowledge base. The FAQ reveals that you cannot change the AI model on the free plan, and that document upload is only for the knowledge base, not for direct fact-checking. These constraints mean that power users will need to invest time in building and maintaining their knowledge base, and will likely need to upgrade to Pro to get the most out of the tool.

For a practical buyer, the decision hinges on whether your fact-checking needs are source-specific and document-heavy. If they are, Zealos offers a unique capability that few other tools provide. If you need general-purpose verification or real-time web checking, look elsewhere. The WordPress integration, when it arrives, could make Zealos a valuable plugin for publishers, but for now, the workflow requires manual text entry and export. Zealos is a promising but incomplete solution—powerful in its niche, but not yet a universal fact-checking platform.