OpenEvidence Review: The Free Medical AI Most US Doctors Already Use

OpenEvidence is a medical question-and-answer tool for clinicians. You ask a clinical question and get a cited answer drawn from peer-reviewed sources. It is free and unlimited for verified US healthcare professionals, and it is paid for by ads.

The company calls itself the most widely used medical AI among verified US clinicians. It claims more than 200 million consultations to date. This review covers what it does, who can get in, and where the catch is.

What does OpenEvidence do?

The core is the ask bar. Type a clinical question, in English or another language, and OpenEvidence answers with citations you can open. The sources are licensed, not scraped. OpenEvidence has content agreements with the New England Journal of Medicine, JAMA, Nature, Cochrane and the NCCN cancer guidelines. It names more than a dozen medical societies as partners.

Each answer carries an EvidenceGrade. That is a label showing how strong the cited evidence is. A single case report does not read like a trial. You can also ask it to build a workup for a presentation.

Around the ask bar sit clinical tools. Visits records a patient encounter, transcribes it, and drafts the note with evidence pulled into the assessment and plan. Coding Intelligence suggests CPT and ICD-10 codes and an E/M level with the reasoning written into the note. Doctor Dialer sends texts, faxes and voicemail from a dedicated number. Patient Take-Homes turn the visit into plain-language material for the patient.

There are iPhone and Android apps. Since September 2026 it runs on OpenEvidence's own models, led by one named Darwin.

Which features stand out?

• Cited answers from licensed journals — NEJM, JAMA, Nature, Cochrane and NCCN full text, not web scraping
• EvidenceGrade — a strength-of-evidence label on every answer
• Visits — ambient transcription with evidence woven into the note, plus custom templates
• Coding Intelligence — CPT, ICD-10 and E/M suggestions with the rationale in the note
• Doctor Dialer — texts, fax and voicemail from inside the app
• Dotflows — reusable prompts triggered by typing a period, with a shared library
• CE and MOC credit — continuing education earned inside the platform
• Free and unlimited — no tiers, no caps, for verified US professionals

How much does OpenEvidence cost?

Nothing. There is no paid plan, no usage cap and no premium tier. The company says it is committed to keeping the service free and equal for every healthcare professional.