OpenEvidence
OpenEvidence is a free, ad-supported clinical AI search tool that synthesizes cited answers from peer-reviewed medical literature for verified US healthcare professionals.
Medically reviewed by Dr. L · General Medicine, UK
- Pricing
- Free Free for verified US healthcare professionals; ad-supported (largely pharmaceutical). Not available outside the United States.
- Availability
- United States only
- Languages
- English
- Vendor
- OpenEvidence
- Overall score
- 6.3 See the scoring →
What is OpenEvidence?
OpenEvidence is a US-only AI medical search tool, founded in 2022, that returns cited answers synthesized from peer-reviewed literature. Free for verified US healthcare professionals, it is among the most widely adopted free clinical AI tools in the United States, and reached a $12B valuation in its January 2026 Series D (Reuters, Jan 2026).
What is OpenEvidence best at?
- Free for verified US clinicians. No paywall, no per-query cost.
- Fast, cited answers. Designed for short clinical queries grounded in named peer-reviewed sources.
- Premium content partnerships. Multi-year content agreements with NEJM Group (2025) and the JAMA Network (2025) that most competitors cannot easily match.
- Described as HIPAA-compliant with support for clinical use involving PHI, institutions should review the current Business Associate Agreement before integration.
What are OpenEvidence’s limitations?
- US-only. Requires US professional verification and uses US guidelines / FDA approvals by default. International clinicians cannot register.
- English-only. No confirmed multilingual support as of 2026.
- Ad/pharma-funded. Revenue comes from advertising, largely pharmaceutical, a model some clinicians flag as a potential conflict-of-interest consideration.
- Accuracy on complex cases. An independent preprint (medRxiv, Nov 2025) reported materially lower accuracy on complex subspecialty cases than OpenEvidence’s headline USMLE-style results. Note this is a non-peer-reviewed preprint with a small sample.
- Literature-based, not guideline-curated. Strong for evidence summarization, weaker for guideline-driven, time-pressured decisions like emergency medicine.
Who is OpenEvidence best for?
US-based clinicians (especially internal medicine, hospital medicine, and specialty practice) who want fast, free, citation-backed answers from the literature. For non-US clinicians, who cannot register, see our Vera Health review.
Frequently asked
- Is OpenEvidence free?
- Yes, OpenEvidence is free for verified US healthcare professionals. Access requires professional verification with a US medical license, NPI number, or institutional email. It is not available to clinicians outside the United States.
- What is OpenEvidence?
- OpenEvidence is an AI medical search tool, founded in 2022, that returns cited answers synthesized from peer-reviewed literature. It is free for verified US healthcare professionals and is among the most widely adopted clinical AI tools in the US; OpenEvidence reached a $12B valuation in its January 2026 Series D (Reuters, Jan 2026).
- How does OpenEvidence make money?
- OpenEvidence is free to clinicians; its revenue model is advertising, largely pharmaceutical, rather than user subscriptions. It also holds content agreements with NEJM Group (2025) and the JAMA Network (2025). The ad/pharma-funded model is sometimes raised as a potential conflict-of-interest consideration, a contrast with subscription- or grant-funded tools.
- Is there an OpenEvidence API?
- As of mid-2026 OpenEvidence does not offer a public, generally available API for third-party developers. Integrations with institutional EHRs are handled directly by the company.
- Is OpenEvidence available outside the US?
- No. OpenEvidence requires US professional verification and defaults to US guidelines and FDA approvals. Clinicians outside the United States cannot register or use the product.
- Is OpenEvidence HIPAA compliant?
- OpenEvidence is described as HIPAA-compliant and supports clinical use involving PHI. Institutions evaluating integration should review OpenEvidence's current Business Associate Agreement terms directly.
- How does OpenEvidence compare to UpToDate?
- OpenEvidence is free and tuned for fast, literature-grounded answers. UpToDate is a paid subscription, broader in depth, and authored by named clinical editors with structured topic reviews. Many US clinicians use both, OpenEvidence for speed, UpToDate for depth.
- Who owns OpenEvidence?
- OpenEvidence is an independent, venture-backed company founded in 2022, funded through advertising and content partnerships rather than clinician subscriptions.
- Is OpenEvidence good?
- OpenEvidence is a strong free option for US clinicians who want fast, citation-backed answers from the medical literature. It is less suited to guideline-curated decisions (e.g. emergency medicine) and is unavailable to non-US clinicians. See our review and scoring on the right.