Simulai.co Review: AI Chat With Your PDFs -- Does It Actually Work?

What Is Simulai.co?

Simulai.co is an AI-powered document assistant that lets you upload PDFs and have a conversation with them. Ask questions about the content, extract specific data, summarize sections, or compare information across multiple documents.

How We Tested It

We uploaded three types of documents:

1. Academic research papers (10 papers, 200+ pages total)

2. Legal contracts (5 NDAs and service agreements)

3. Technical documentation (API docs, architecture specs)

For each category, we asked 20 questions ranging from simple factual lookups to complex analysis requiring cross-referencing.

Results by Document Type

Research Papers (8.5/10)

Simulai correctly answered 85% of our questions about research papers. It excels at summarizing findings, explaining methodology, and extracting key statistics. It occasionally struggled with complex mathematical formulas and cross-referencing between papers.

Legal Contracts (8.0/10)

For legal documents, accuracy was around 80%. It correctly identified key terms, obligations, and dates. However, it sometimes missed nuanced legal language and conditional clauses. We would not rely on it as a sole reviewer but it is excellent for initial analysis.

Technical Docs (8.3/10)

Good at extracting API endpoints, parameters, and examples. Occasionally confused when the same term was used differently in different sections.

Key Features

Multi-document chat: Upload multiple PDFs and ask questions across all of them

Source citations: Every answer includes page and section references

Summary generation: One-click summaries at various detail levels

Data extraction: Pull tables, figures, and structured data from documents

Export: Save conversations and extracted data

Comparison with Alternatives

Feature	Simulai	ChatPDF	Humata
Multi-doc support	Yes	Limited	Yes
Source citations	Yes	Yes	Yes
Max file size	50MB	32MB	60MB
Accuracy (our test)	82%	78%	80%
Free tier	5 docs/month	3 docs/day	60 pages

Pricing

Free: 5 documents per month, 50 questions

Pro: $12/month (unlimited documents, 1000 questions)

Team: $29/user/month

Verdict: 8.1/10

Simulai.co does what it promises -- it makes PDF documents conversational and searchable. The accuracy is good enough for research, initial legal review, and technical reference. At $12/month for the Pro plan, it pays for itself if you regularly work with long documents.

Best for: Researchers, legal professionals, and anyone who reads lots of PDFs.