Otnac vs OpenEvidence
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Otnac
This application allows project team members and system administrators of organizations using Epic Canto to preview upcoming development before it is released to clinicians. Access requires administrator security within an organization that is live on or installing Canto. Clinical users should download the standard Epic Canto app instead.
- Preview upcoming Epic Canto development
- For project team members
- For system administrators
- Requires Epic Canto installation
- Administrator security access
Read full descriptionHide full description
With Otnac, project team members and system administrators of organizations using Epic Canto can preview upcoming development before it is released to clinicians. To use this application, your organization must either be live on or installing Canto. Additionally, you must have appropriate administrator security within your organization. If you are a clinical user of Epic Canto, please be aware that you will not be able to access Otnac. Instead, you should download the current version of Epic Canto from the App Store.
OpenEvidence
This AI-powered medical search engine provides verified healthcare professionals with evidence-based answers to clinical questions. It sources information from millions of peer-reviewed papers and leading medical journals, offering cited claims and CME credits.
- Evidence-based clinical answers
- Cited sources and references
- Access to 35 million+ papers
- CME and MOC credits
- HIPAA compliant
- Ambient documentation and secure calls
Read full descriptionHide full description
Clinical Decision Support & Medical Search Engine for Healthcare Professionals (NPI Required) OpenEvidence is the most widely used clinical decision support platform and medical search engine among U.S. clinicians. According to independent studies, more American physicians use OpenEvidence than all other AI platforms combined. OpenEvidence is trusted by millions of verified healthcare professionals to make high-stakes clinical decisions at the point of care with answers that are sourced, cited, and grounded in peer-reviewed medical literature. Founded with the mission to organize and expand the world's collective medical knowledge, OpenEvidence is actively used daily by the majority of physicians in the United States. OpenEvidence is free for all verified U.S. clinicians. AN OFFICIAL AI PARTNER OF: The New England Journal of Medicine (NEJM) The Journal of the American Medical Association (JAMA) and its 11 specialty journals National Comprehensive Cancer Network (NCCN) Nature Cochrane Library Wiley WHAT YOU GET: • Specific answers to clinical questions, with every claim cited to its source • 35 million+ peer-reviewed papers, 300+ medical journals, plus FDA and CDC sources • Licensed full text from NEJM, JAMA, Nature, Cochrane, and others • EvidenceGrade™: see the strength of the evidence behind every answer • CME and MOC credits, earned by asking questions • Visits for ambient documentation, Dialer for secure patient calls, and Voice Mode for hands-free answers CONTENT AGREEMENTS AND COLLABORATIONS: American Academy of Family Physicians (AAFP) American College of Cardiology (ACC) American Diabetes Association (ADA) American Academy of Pediatrics (AAP) American College of Obstetricians and Gynecologists (ACOG) American College of Emergency Physicians (ACEP) ASCO Guidelines American Academy of Orthopaedic Surgeons (AAOS) American Academy of Ophthalmology (AAO) American Urological Association (AUA) Plus AAO-HNS, GINA, SNO, SSO, and more. IN USE ACROSS: 10,000+ hospitals and medical centers nationwide, including Mayo Clinic, Mount Sinai, Cedars-Sinai, MSKCC, and Sutter Health. WHY CLINICIANS TRUST US: • HIPAA compliant across the platform • NEJM, JAMA, Nature, and NCCN—official content partners • Tens of millions of clinical consultations per month WHAT CLINICIANS SAY: “OpenEvidence is currently the best AI tool for medical information.” — Dr. Paul Sax, Infectious Disease, Brigham and Women’s Hospital, Review in The New England Journal of Medicine Journal Watch (now NEJM Clinician) “In a morning report, a resident had a question that I didn’t know the answer to, but we were able to open OpenEvidence and get an answer on the spot.” — Dr. Kyle P. Lehenbauer, Minneapolis Veterans Affairs Medical Center “I use OpenEvidence multiple times during the day and every day. I am a better doc because of this. I expand my differential diagnoses and verify the science behind choices of treatments.” — Dr. Sharon E. Martin, Southern Huntingdon Medical Center Important note: OpenEvidence is available only to healthcare professionals. Users must verify their healthcare professional status before using OpenEvidence.
Screenshots
Verdict
The clearest difference is rating: OpenEvidence at 4.9 against Otnac's 3.0. OpenEvidence also leads on ratings volume (12K vs 2) and update cadence (weekly vs every 3 weeks). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OpenEvidence holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: OpenEvidence has 12K ratings behind it against 2, so its average is the more settled of the two.
Otnac ships an update every 3 weeks, OpenEvidence weekly. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.
| Parameter | Otnac | OpenEvidence |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 4.9 (12K ratings) — better |
| Positive reviews | — | 81.3% of reviews |
| Number of ratings | 2 | 12K — better |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | — | #44 — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 559 MB | 96 MB |
| Age rating | 17+ | 17+ |
| Developer | Epic | OpenEvidence Inc. |
Customer experience
Otnac
OpenEvidence
Bugs and requests
Otnac
Not enough reviews yet to summarise bugs or requests.
OpenEvidence
Reported bugs
1 issue- App not working in latest update
Requested features
2 requests- Availability on MacBook
- Integration with clinical workflows and EMRs
In-app purchases
Otnac
No in-app purchases
OpenEvidence
No in-app purchases
Questions
Is Otnac free?
Is OpenEvidence free?
Which has better reviews, Otnac or OpenEvidence?
Do Otnac or OpenEvidence have ads?
Which is updated more often, Otnac or OpenEvidence?
Other comparisons















