Best Alternatives to Exa.ai

Neural semantic web search — deep/academic source retrieval; agent-native API design. Compare 10 similar free AI tools.

1. Exa.ai — Neural search API — ideal for AI agents (Free: Free tier; semantic + contents API)
2. NewsAPI.ai — 150K+ news sources with semantic search — ideal for trend monitoring agents (Free: 2,000 searches/month free)
3. NewsAPI.ai — 150K+ sources, semantic search — 2000 free searches/month; ideal for proactive AI trend alerts (Free: 2,000 searches/month free tier)
4. Khoj — Most mature open second-brain AI — native Obsidian integration, semantic search, deep research (Free: OSS; Docker/Python + Obsidian plugin)
5. kaymen99/personal-ai-assistant — LangGraph + Telegram multi-agent system — supervisor orchestrating Email, Calendar, Notion, Slack sub-agents (Free: Open source; MIT)
6. AI Build AI — An open-source framework for building AI tools using AI-assisted development. (Free: Completely free open-source framework available on GitHub.)
7. Perplexity AI — AI search with citations + Deep Research (Free: Unlimited basic, 5 Pro/day, 3 Deep Research/day)
8. Manus — General-purpose AI agent — executes complex multi-step tasks autonomously with browser, code, and file capabilities (Free: Free credits on signup; pay-as-you-go after)
9. Brave Search API — Privacy-first search API — 2K free/month (Free: 2,000 free queries/month)
10. Semantic Scholar — 200M+ papers with AI-generated TLDR summaries (Free: 100% free)

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