# Otnac vs OpenEvidence

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.

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.

## The numbers

| Metric | Otnac | OpenEvidence |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/otnac/id417750647/reviews) | **[4.9 (12K ratings)](https://appshunter.io/ios/app/openevidence/id6612007783/reviews)** |
| Number of ratings | 2 | **12K** |
| Positive reviews | — | 81.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free | Free |
| Best chart rank | — | **#44** |
| Size | 559 MB | 96 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Epic](https://appshunter.io/developer/348308666) | [OpenEvidence Inc.](https://appshunter.io/developer/1761260627) |

## What reviewers say

### Otnac

[App page](https://appshunter.io/ios/app/otnac/id417750647)

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.

**Highlights:** Preview upcoming Epic Canto development, For project team members, For system administrators, Requires Epic Canto installation, Administrator security access

**In-app purchases:** none


### OpenEvidence

[App page](https://appshunter.io/ios/app/openevidence/id6612007783)

**Currently charting:** #44 Top Free · Medical (US App Store)

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.

**Highlights:** Evidence-based clinical answers, Cited sources and references, Access to 35 million+ papers, CME and MOC credits, HIPAA compliant, Ambient documentation and secure calls

**Features:** Siri integration

**In-app purchases:** none

**What reviewers like**

- 🚀 Accurate and concise answers
- 💡 Provides references and sources
- 👍 Helpful for clinical practice
- 🚀 Efficient search and retrieval
- 👍 Invaluable quick reference tool

**What reviewers complain about**

- 🐛 App not working in latest update
- ⚠️ Requires specific prompts for complete information

**Reported bugs**

- App not working in latest update

**Requested features**

- Availability on MacBook
- Integration with clinical workflows and EMRs


## Frequently asked questions

### Is Otnac free?

Otnac is free to download, with no in-app purchases.

### Is OpenEvidence free?

OpenEvidence is free to download, with no in-app purchases.

### Which has better reviews, Otnac or OpenEvidence?

OpenEvidence is rated higher. Otnac averages 3.0 out of 5 from 2 ratings, while OpenEvidence averages 4.9 from 12K ratings.

### Do Otnac or OpenEvidence have ads?

Neither Otnac nor OpenEvidence shows ads.

### Which is updated more often, Otnac or OpenEvidence?

Otnac ships an update every 3 weeks, and OpenEvidence weekly. Most recently, Otnac was updated on October 29, 2026 and OpenEvidence on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*