Unriddle

What is Unriddle?

The most impressive aspect of testing Unriddle was watching it index a 200-page PDF in under 15 seconds. The most frustrating part was hitting the free tier limit quickly after asking three questions (I hit the limit in five minutes).

Unriddle AI Inc. developed this platform to function as an AI research assistant. It helps academics and analysts extract data from massive document libraries. Users can query multiple files at once and generate cited summaries.

Key Features and How Unriddle Works

Document Analysis and Search

• Multi-document Chat: Query up to 100 documents simultaneously in a single workspace.
• DeepSearch: Performs multi-step reasoning to find obscure data points. This feature is limited to the Max plan.
• OCR Engine: Extracts text from scanned documents and images for full-text searchability.

Writing and Citation Tools

• Auto-Citations: Every AI response includes clickable references to the exact page and paragraph.
• Integrated Editor: A markdown-based writing space suggests source material as you type.
• Model Selection: Switch between GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro.

Organization and Access

• Graph View: Visualizes relationships and themes between different files in your collection.
• Chrome Extension: Summarize and chat with any web page or online PDF without leaving the tab.
• Collaborative Folders: Share document sets with team members for collective intelligence projects.

Unriddle Pros and Cons

Pros

• Precise citation mapping ensures every claim can be verified against the original source text.
• High-speed indexing processes large files exceeding 200 pages in less than 15 seconds.
• Unified interface for reading and writing eliminates the need to toggle between multiple apps.
• Flexible model options allow users to choose the specific strengths of Claude or GPT.

Cons

• The free tier word limit is extremely low and often exhausted after a single long document.
• Occasional hallucinations occur when asking the AI to synthesize data from conflicting sources.
• Mobile browser experience lacks the full functionality and ease of use found on desktop.
• No offline mode exists, requiring a constant internet connection to access the document library.

Who Should Use Unriddle?

• Academic Researchers: Graduate students and professors can generate literature reviews with automatic citations linking directly to source pages.
• Legal Analysts: Paralegals can find specific evidence across a library of 50 or more documents using semantic cross-file search.
• Casual Readers: This tool is not a good fit for people who just want a quick summary of a single short article. The pricing model favors heavy users.

Unriddle Pricing and Plans

The Free plan costs $0 per month but restricts you to 1,000 words per day and 5 total uploads.

The free tier functions more like a limited trial than a usable free product.

The Plus plan costs $10 per month billed annually or $12 monthly. It increases limits to 4,000 words per day and includes access to Gemini Flash.

The Pro plan costs $20 per month billed annually or $24 monthly. It provides unlimited words and uploads, plus access to GPT 5.1, Claude, and Gemini Pro.

The Max plan costs roughly $30 per month. It adds DeepSearch agents and access to Claude Opus 4.5 and Gemini 3 Pro.

The Enterprise plan offers custom pricing. It includes SSO, compliance certificates, and dedicated support for large organizations.

How Unriddle Compares to Alternatives

Similar to ChatPDF, Unriddle allows users to upload and query large documents. ChatPDF focuses on single-document interactions and offers a better free tier. Unriddle excels at cross-document search, letting you query up to 100 files simultaneously.

Unlike SciSpace, which targets scientific literature with a built-in database of published papers, Unriddle requires you to bring your own documents. SciSpace provides better tools for understanding complex math and formatting citations in specific academic styles. Unriddle offers a superior integrated writing environment (the markdown editor is excellent for drafting).

Verdict: The Ideal Tool for Heavy Document Researchers

Unriddle delivers exceptional value for academics and analysts who need to synthesize information across dozens of long-form documents.

Casual users should look elsewhere.

If you only need to chat with a single PDF, ChatPDF is a more cost-effective alternative.