How do their growth rates compare?

Liminary has a month-over-month growth rate of -30.4%; OpenCrab has -100%.

How does pricing compare?

Liminary: Freemium. Free download available to get started. Subscription tiers for professional and small-team use are listed on the Liminary site. Check the official pricing page for current plan details, since published tiers may change. OpenCrab: Freemium. Free tier at $0/month for exploring and sharing public ontology packs and basic graph queries. Pro is $10/month for private document ingestion and a personal graph RAG workspace. Expert is $30/month for pack publishing workflows and MCP reverse ingest. Billing is handled securely via Paddle and can be changed at any time.

What are alternatives to Liminary and OpenCrab?

Other tools in related categories include Notion, Studocu, SciSpace, Readray (formerly Lilys AI), Connected Papers.

Liminary vs OpenCrab — Traffic (12.25K vs 0), Pricing & Verdict

Open AI Tools

Liminary vs OpenCrab — Traffic (12.25K vs 0), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Liminary	OpenCrab
Official Domain	liminary.io	opencrab.sh
Pricing Model	Freemium	Freemium
Monthly Visits	12.25K (12,246)	0 (0)
MoM Traffic Delta	-5.34K (-30.4%)	-1.89K (-100%)
Primary Market & Share	🇺🇸 United States (59.1%)	🌐 Global (—)
Direct Visits / mo	4.87K	0
User Rating	4.1	4.1
Supported Platforms	Website	Website

Liminary

An AI memory layer that resurfaces your research when it matters

One-click saving anywhere

Capture web pages, PDFs, videos, reports and LLM chats while you browse, then annotate them with your own notes and context.

Proactive recall

Instead of waiting for a search, Liminary surfaces the relevant saved material while you write and inside meetings.

Magnet meeting sidekick

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.

Sourced, traceable answers

Every answer points back to where it came from, internal or external, so you can verify claims rather than trust a black box.

Strengths & Pros

+Proactive recall means relevant knowledge finds you instead of requiring a search
+Answers stay traceable to saved sources, which suits high-stakes professional work
+Captures many source types in one place: pages, PDFs, videos and AI chats
+Explicit privacy stance: encrypted, siloed per workspace and never used for model training
+