Compare tools
Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
⇄ Comparison dimension — pick the market you're actually shopping in
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Recall
✓ verifiedFreemium
AI knowledge base that saves, summarizes and connects articles, videos, podcasts and PDFs into a graph you can chat with.
152K visits/mo1.5K saves
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DeepWiki
✓ verifiedFree
Free tool that auto-generates conversational, browsable documentation for any public GitHub repo, from the makers of Devin.
1.2M visits/mo
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Ello
✓ verifiedFreemium
Adaptive AI reading and math tutor for children ages 4-9 that listens and adjusts lessons in real time.
1.1K visits/mo
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Shaped AI
✓ verifiedFreemium
Managed AI ranking engine powering personalized search, recommendations, and feeds via a SQL-like query language.
88K visits/mo
Pricing
Free: $0 (10 AI summaries/mo)
Plus: $10/mo billed yearly (unlimited summaries)
Max: $38/mo billed yearly (bulk actions, model choice)
No public pricing
No public pricing
Standard: usage-based, $500/month minimum
Storage: $0.20 per GB
Enrichment tokens: $2 per million tokens
Reads: $0.45 per thousand
Writes: $0.012 per thousand
Training & encoding: $6 per hour
Free trial available
Core features
- ✦One-click saving of articles, videos, podcasts, PDFs
- ✦AI summaries of saved content
- ✦Automatic tagging and knowledge-graph linking
- ✦Chat with your knowledge using GPT, Claude or Gemini
- ✦Spaced-repetition quizzes
- ✦Browser extension, web and mobile apps; API/MCP access
- ✦AI-generated documentation for GitHub repos
- ✦Conversational Q&A about a codebase
- ✦Browsable index of popular repositories
- ✦Deep code indexing via Devin
- ✦Real-time AI listening and adaptation
- ✦Interactive reading and math curriculum
- ✦Create-your-own books
- ✦Science of Reading-aligned library
- ✦Parent progress reports
- ✦Child safety filters
- ✦ShapedQL SQL-style query interface for retrieval and ranking
- ✦Hybrid semantic and keyword search
- ✦Continuous learning from user feedback signals
- ✦30+ native data connectors for warehouses and streams
- ✦Sub-50ms query latency
- ✦Python and TypeScript SDKs plus MCP support
Use cases
- →Building a personal 'second brain'
- →Summarizing long content to save time
- →Chatting with your own saved knowledge
- →Retaining what you read via spaced repetition
- →Understanding an unfamiliar codebase quickly
- →Onboarding to open-source projects
- →Answering questions about repo internals
- →Helping young children learn to read
- →Building early math skills
- →Supporting struggling or advanced readers
- →Giving parents visibility into progress
- →Personalizing 'for you' content feeds
- →Building product recommendation systems
- →Powering RAG retrieval with behavioral ranking
- →Adding hybrid search to an e-commerce site
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