SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
#1ChatPDF records 1,044,477 monthly visits with -3.7% month-over-month growth and Freemium pricing. Liminary records 12,246 monthly visits with -30.4% growth and Freemium pricing.

An AI memory layer that resurfaces your research when it matters
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | chatpdf.com | liminary.io |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 1.04M (1,044,477) | 12.25K (12,246) |
| MoM Traffic Delta | -40.47K (-3.7%) |
| -5.34K (-30.4%) |
| Primary Market & Share | 🇺🇸 United States (9.6%) | 🇺🇸 United States (59.1%) |
|---|
| Direct Visits / mo | 457.79K | 4.87K |
|---|
| User Rating | 4.2 | 4.1 |
|---|
| Supported Platforms | Website | Website |
|---|
Chat with any PDF, video, or website and get cited answers in seconds
Every response is anchored to your source document with clickable citations that scroll to the exact passage, so verification takes seconds instead of page-by-page searching.
Organize documents into folders and query many files in a single conversation to compare arguments, cross-reference findings, or study a whole syllabus at once.
Condense long papers, reports, and contracts into key takeaways, and translate or query documents in any language — including mixing a source language with a different question language.
Generate flashcards and slide decks from your material, and use the built-in AI writer and AI detector for drafting and checking academic text.

An AI memory layer that resurfaces your research when it matters
Capture web pages, PDFs, videos, reports and LLM chats while you browse, then annotate them with your own notes and context.
Instead of waiting for a search, Liminary surfaces the relevant saved material while you write and inside meetings.
A meeting companion that pulls in the right information at the right moment, then saves the summary, full transcript and your notes for later recall.
Every answer points back to where it came from, internal or external, so you can verify claims rather than trust a black box.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
#1
Share and access study materials worldwide — with AI study tools built in

AI research platform for reading, understanding and writing scientific papers
#3Free / Open-sourceCompletely free PDF reading and editing tool with AI assistant, though basic compared to dedicated platforms.

Free AI-powered PDF editor, converter and reader for every device

Combines full desktop PDF editing software with AI chat, but requires software installation for full features.

A proactive AI reading lens for papers, videos, and web pages

Translate, summarize, and understand documents in 154 languages without losing the layout
Includes robust developer APIs for custom document workflows, but free tier limits document page counts.

Turn research papers and articles into interactive summary flashcards

Your files, notes and meetings in one drive — with an AI that knows all of it.
An AI notes app that organizes your knowledge for you
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
Share and access study materials worldwide — with AI study tools built in
AI research platform for reading, understanding and writing scientific papers
Free AI-powered PDF editor, converter and reader for every device
A proactive AI reading lens for papers, videos, and web pages
Translate, summarize, and understand documents in 154 languages without losing the layout
Turn research papers and articles into interactive summary flashcards
Your files, notes and meetings in one drive — with an AI that knows all of it.
An AI notes app that organizes your knowledge for you