Isabel Healthcare vs OpenEvidence
Free against $149 per year is the first gap. OpenEvidence costs verified US physicians nothing and is paid for by advertising, while Isabel Standard is $149 per year after a 30-day trial. The jobs differ too. OpenEvidence returns cited literature answers, and Isabel turns age, sex and symptoms into a ranked differential with don't-miss flags, which suits an emergency physician facing a vague complaint. Isabel is the weaker buy for a health system that requires a stated BAA. OpenEvidence's security page states HIPAA compliance, a standard BAA and a SOC 2 Type II report for the Security category, and Isabel states none of the three. Isabel lists the Cerner App Gallery, Epic info-button access and an API, where OpenEvidence names no integration and states no FDA status. Two Reddit threads from September 2025 report an error and journal bias in OpenEvidence. Access is limited to verified US clinicians, so a physician practicing outside the US cannot get in.
Decision support · Reviewed November 1, 2026
Isabel Healthcare
by Isabel Healthcare · founded 1999
Differential-diagnosis generator with self-triage and educator products. The vendor says it is used in over 90 countries and 14 languages.
OpenEvidence
by OpenEvidence · founded 2022
Free physician-only literature-grounded Q&A, 1M consults/day.
When to pick each one
Isabel Healthcare
- Ranked differential with don't-miss flags from symptoms
- Standard is $149 per year after a 30-day trial
- Links to DynaMed, DynaMedex and BMJ Best Practice
OpenEvidence
- Free for NPI-verified physicians, ad-funded
- Cited literature answers, NEJM and JAMA partners
- BAA and SOC 2 Type II stated by the vendor
Score
Each row shows points earned of points available under the published rubric.
Isabel Healthcare
35of 100
OpenEvidence
52of 100
| Dimension | Isabel Healthcare | OpenEvidence | Difference |
|---|---|---|---|
| FDA clearance | 0 / 12 | 0 / 12 | 0 |
| HIPAA / SOC2 / BAA | 0 / 10 | 0 / 10 | 0 |
| EHR integrations (count) | 0 / 5.6 | 0 / 5.6 | 0 |
| Top-3 EHR coverage (Epic / Oracle / Athena) | 0 / 4.8 | 0 / 4.8 | 0 |
| Bidirectional write-back | 0 / 1.2 | 0 / 1.2 | 0 |
| Peer-reviewed papers | 14.7 / 21 | 21 / 21 | -6.3 |
| RCT / meta-analysis / systematic review | 0 / 9 | 4.5 / 9 | -4.5 |
| Funding & adoption signal | 6 / 12 | 12 / 12 | -6 |
| Pricing transparency | 2.5 / 2.5 | 2.5 / 2.5 | 0 |
| Years in market | 6 / 6 | 4.2 / 6 | +1.8 |
Scroll horizontally to see every column.
Pricing
Isabel Healthcare
| Tier | Monthly | Annual | Notes |
|---|---|---|---|
| Standard | n/a | $149 | EUR 139 incl. VAT. 30-day free trial. |
| Premium | n/a | $199 | EUR 179 incl. VAT. Adds an LLM layer (English only). |
| Student / resident | n/a | $49 | Not available to EU students. 50% discount for listed emerging economies. |
| Institutional | n/a | n/a | Demo request, no public price. The API has been available since 2010. |
OpenEvidence
| Tier | Monthly | Annual | Notes |
|---|---|---|---|
| Plan | n/a | n/a | Free for NPI-verified physicians (ad-funded). |
Evidence
Isabel Healthcare
FDA decisions
No FDA decision cited in our research as of October 20, 2026.
Peer-reviewed
2 PubMed records name Isabel Healthcare.
- Cracking the code: a head-to-head comparison of expert clinicians and artificial intelligence in diagnosing rare diseases. (opens in new tab)
- Is language an issue? Accuracy of the German computerized diagnostic decision support system ISABEL and cross-validation with the English counterpart. (opens in new tab)
OpenEvidence
FDA decisions
No FDA decision cited in our research as of October 20, 2026.
Peer-reviewed
5 PubMed records name OpenEvidence.
- Performance of Large Language Models on Diagnostic Radiology Board-Style Questions: A Comparative Evaluation of GPT-4o, Perplexity AI, and OpenEvidence. (opens in new tab)
- OpenEvidence. (opens in new tab)
- Concordance of ChatGPT, Gemini, Claude, and OpenEvidence with the 2024 AAOS guidelines on acute isolated meniscal pathology. (opens in new tab)
Community
20 posts sourced: 3 positive, 14 neutral, 3 negative.
Compliance and integrations
Documented from each vendor’s own pages.
| Spec | Isabel Healthcare | OpenEvidence |
|---|---|---|
| Free tier | ||
| HIPAA | ||
| SOC 2 Type II | ||
| EHR integrations | Not specified | Not specified |
| Founded | 1999 | 2022 |
| HQ | UK | US |
Scroll horizontally to see both columns.
Common questions
Open the full decision support comparison
Differential diagnosis, treatment guidance, drug interactions, evidence-grounded Q&A. The CDS landscape ranges from the UpToDate gold standard to physician-only OpenEvidence. We compared what clinicians actually use.