Best AI Research & Knowledge Tools
Founders read constantly and retain a fraction of it. These summarise documents, answer questions across your own files, and keep what you have read somewhere you can search later.
- 1PerplexityFreemium
The default answer engine — cites sources, so you can check it rather than trust it.
AI-powered search that cites its sources.
- 2Notebook LMFree
Grounds every answer in the documents you upload, which makes it far harder to hallucinate.
AI research assistant that transforms your documents into interactive knowledge.
- 3PDF.aiFreemium
Chat with a specific PDF — the fastest way through a long report or contract.
Chat with your PDFs using AI to get instant answers.
- 4HebbiaPaid
Reads thousands of documents at once; built for diligence-scale research.
AI for enterprise research — read thousands of docs at once.
- 5Roam ResearchPaid
Networked thought — note-taking for power users.
- 6HeptabasePaid
Visual whiteboard for serious researchers and learners.
- 7SliteFreemium
Async-first knowledge base for remote teams.
- 8TettraFreemium
Knowledge base for Slack-first teams.
- 9PDF0Free
Fast, free PDF tools that run entirely in your browser.
- 10Cluing (formerly Collabwriting)Freemium
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