Exa vs Harmonic (Aristotle)
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Exa
Web search and retrieval API built for AI agents and apps
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Harmonic (Aristotle)
Math-reasoning AI from Robinhood CEO Vlad Tenev, using formal proofs t...
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| RECATOOLS Score | 7.7 / 10 | 7 / 10 |
| Capability | — | |
| Value for money | — | |
| Ease of use | — | |
| ASEAN readiness | — | |
| API quality | — | |
| Pricing | Freemium | Freemium |
| Free tier | 20,000 search requests per month on the free plan; startup and education grants of $1,000 in free API credits also available | Free Aristotle chatbot app on iOS and Android (beta). |
| Paid from | API search billed at $7 per 1,000 requests (as of March 2026 pricing update) | Paid / enterprise API access for higher-volume use |
| Has API | ✓ | ✓ |
| Open source | ✗ | ✗ |
| Free to use | ✓ | ✓ |
| Users | — | — |
| Founded | 2021 | 2023 |
| Maker | — | Vlad Tenev, Tudor Achim |
| Verdict | Exa earns its credibility through customer names, not just claims: Cursor, Notion AI, Cognition and OpenRouter all use it in production, and a $250M Series C at a $2.2B valuation (May 2026, led by a16z) backs that up. Th... |
What this is for: Solving and formally verifying mathematical problems using the Lean proof assistant to avoid hallucinated reasoning. Who this is for: Mathematicians, researchers, students and developers who need trust... |
| Full review → | Full review → |
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.