About OpenEvidence
OpenEvidence is a Healthcare company based in Cambridge (United States) founded in 2021 by Zachary Ziegler and Daniel Nadler. Medical evidence is aggregated and visualized for healthcare professionals. It operates in the Healthcare and Technology sectors. OpenEvidence has raised $985 million across 12 funding rounds from investors including Nvidia, Craft and Kleiner Perkins. The company has 145 employees. OpenEvidence was last valued at $15 billion in September 2026. Its website openevidence.com draws about 8.1 million monthly visits. OpenEvidence offers products and services including OpenEvidence App. Its focus areas include HealthTech, Healthcare IT, Provider and Professional Network. Its competitors include iDoctus, Copient Health and Nested Knowledge; 2 of its 3 listed competitors have raised funding.
Company details
OpenEvidence was founded in 2021 in Cambridge, United States, as an AI-powered platform in the healthcare sector. Clinically relevant evidence from peer-reviewed literature is aggregated, synthesized, and visualized to support healthcare professionals. Access to accurate medical information is facilitated, aiding informed decision-making in clinical practice. Operations focus on enhancing usability of medical resources for professionals in the field.
- Headquarters Cambridge, United States
- Employees 145
- Founders Zachary Ziegler, Daniel Nadler
- Stage Unicorn
- SectorsHealthcareTechnology
- Website category News and Media
- Email••••••••
- Website openevidence.com
- Social LinkedIn X
- Total Equity Funding$985M (USD)
in 12 rounds
- Latest Funding Round$250M (USD), Series D
Sep 2026
- InvestorsNvidia
& 24 more
- Employee Count145
Products & Services of OpenEvidence
OpenEvidence offers a comprehensive portfolio of products and services, including OpenEvidence App.
App providing multimedia and clinical findings for health professionals.
Apps and channels of OpenEvidence
OpenEvidence publishes 2 mobile apps with over 100K+ downloads.
Funding Insights of OpenEvidence
OpenEvidence has successfully raised a total of $985M across 12 strategic funding rounds. The most recent funding activity was a Series D round of $250 million completed in September 2026. This substantial capital infusion reflects strong investor confidence in the company's business model, growth potential, and market opportunities. The funding enables strategic expansion, product development, market penetration, and operational scaling to drive long-term value creation and competitive advantage.
- Total Funding $985M
- Total Rounds 12
- Last Round Series D — $250M
- First Round $165,596
(Jan 2015)
- Investors Count 25
Latest 10 of 12 funding rounds of OpenEvidence with amounts and investors; the two latest post-money valuations are shown, the rest are part of the premium plan.
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
|---|---|---|---|---|---|
| Sep 2026 | $250M | Series D | – | Byers Capital, Andreessen Horowitz | – |
| Jan 2026 | $250M | Series D | – | Thrive Capital, DST Global | |
| Oct 2025 | $200M | Series C | – | Google Ventures | |
| Jul 2025 | $210M | Series B | – | Google Ventures, Kleiner Perkins | |
| Feb 2025 | $75M | Series A | – | Sequoia Capital | – |
| Jan 2021 | $239,142 | Grant | – | – | |
| Oct 2019 | $486,992 | Grant | – | – | |
| Jan 2019 | $126,099 | Grant | – | – | |
| Sep 2017 | $122,672 | Grant | – | – | |
| May 2016 | $88,826 | Grant | – | – |
| Date | Valuation | Stage |
|---|
Full valuation and stage history of OpenEvidence
Every valuation point, the growth-stage changes (minicorn, soonicorn, unicorn) and the dates behind them require an active premium plan.
- All valuation points
- Stage changes
- Dates
- Exports
Verified entity values are shown only after access is granted.
Last known valuation $15B (Sep 2026). 25 investors in total: 24 institutional and 1 angel.
Investors in OpenEvidence
OpenEvidence has secured backing from 25 investors, including venture fund, institutional, and angel investors. Prominent investors backing the company include Nvidia, Craft and Kleiner Perkins.
| Investor | Description | Founded Year | Domain | Location |
|---|---|---|---|---|
Sequoia Capital is engaged in venture capital investments. | 1972 | sequoiacap.com | ||
Corporate backed venture capital fund investing in multiple sectors | gv.com | Mountain View, United States | ||
Venture capital firm investing in early-stage tech startups | 1972 | kleinerperkins.com | Menlo Park, United States | |
Provider of an investment platform for various stages | coatue.com | New York, United States | ||
Early-stage technology startups are invested in by Thrive Capital. | thrivecap.com | New York, United States | ||
Conviction is focused on investing in AI-native software companies. | conviction.com | |||
Investments in multiple sectors are made by Bond Capital. | bondcap.com | San Francisco, United States | ||
Diversified investment management is provided across multiple asset classes. | 1985 | blackstone.com | New York, United States | |
| dst-global.com | ||||
Provider of investment management and real asset services | iconiqcapital.com | San Francisco, United States |
Investor details for OpenEvidence
The complete investor list, round-by-round participation and investor portfolios require an active premium plan.
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Verified entity values are shown only after access is granted.
People of OpenEvidence
2 people are tracked at OpenEvidence (2 in leadership); the tracked headcount is 145.
| Name | Role | Group |
|---|---|---|
Zachary Ziegler | Co-Founder & CTO | Leadership |
Daniel Nadler | Co-Founder | Leadership |
Complete people profiles for OpenEvidence
Full employee and board profiles, team structure, tenure and professional contact details require an active premium plan.
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Verified entity values are shown only after access is granted.
Timeline of OpenEvidence
4 dated milestones of OpenEvidence across 11 years, from founding to its latest funding, stage changes and deals.
- Funding First funding round of $166K.
- Founded OpenEvidence is founded.
- Milestone Reaches Unicorn status.
- Funding Latest funding round, Series D, of $250.0M.
Competitors of OpenEvidence
OpenEvidence has 3 listed competitors in our database, 2 of them funded. They include iDoctus, Copient Health and Nested Knowledge.
| Company Name | Domain | Founded | HQ Location | Total funding | Employees | Description |
|---|---|---|---|---|---|---|
| idoctus.com | 2011 | Spain, United States | Medical app providing drug searches, interactions, and clinical tools for healthcare professionals. | |||
| copienthealth.com | 2019 | Alpharetta, United States | $3.2M | Predictive analysis solutions are provided for healthcare providers. | ||
| nested-knowledge.com | 2018 | Saint Paul, United States | $2.58M | Clinical evidence platform provided for pharma, device, and research entities. |
Detailed competitors of OpenEvidence
The full competitor set, operating metrics and side-by-side benchmarks require an active premium plan.
- Full competitor set
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Web traffic of OpenEvidence
The website of OpenEvidence (openevidence.com) receives about 8.1M visits a month and ranks #8,901 among all websites worldwide, #902 in News and Media.
- Monthly visits8.1M
▲ 16.3% vs previous month
- Unique visitors1.1M
per month
- Global rank#8,901
among all websites
- Category rank#902
News and Media
- Bounce rate28%
- Pages per visit3.9
- Average visit7 min 23 sec
- DevicesDesktop 81% · Mobile 19%
Websites whose visitors overlap most with OpenEvidence. Affinity shows how closely the audiences match.
| Website | Domain | Audience affinity | Monthly visits | Global rank | Profile |
|---|---|---|---|---|---|
| substack.com | 100% | 166.9M | #293 | View details | |
finance.yahoo.com | finance.yahoo.com | 99% | #205 | – | |
| futurism.com | 88% | 5.9M | #10,264 | View details | |
newyorker.com | newyorker.com | 87% | #5,055 | – | |
| newsweek.com | 86% | 53M | #1,063 | View details | |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
| •••••••••• | ••••••.com | ••% | •.•M | #••••• | – |
All 40 similar websites and full traffic analytics for OpenEvidence
The complete similar-websites list, audience overlap and engagement analytics require an active premium plan.
- 40 similar websites
- Audience overlap
- Engagement analytics
- Traffic by brand
Verified entity values are shown only after access is granted.
Top companies in Clinical IT & Data Platforms
3 companies that operate in the same segment as OpenEvidence (Clinical IT & Data Platforms) in United States, ranked by their profile score on The Company Check.
| Company | Description | Founded | Location | Total funding | Revenue | Employees |
|---|---|---|---|---|---|---|
Employee health benefits are facilitated via a cloud-based platform. | 2007 | Plymouth Meeting, Pennsylvania, United States | USD 228.3 M | |||
Healthcare appointments are booked online via Zocdoc's platform. | 2007 | New York, New York, United States | USD 425.97 M | USD 4.66 M | 1,365 | |
Virtual physical therapy and digital pain care solutions are provided. | 2015 | San Francisco, California, United States | USD 854.44 M | 1,746 |
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Related news about Openevidence
Complete news archive for OpenEvidence
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Frequently Asked Questions about OpenEvidence
OpenEvidence was founded in 2021.
OpenEvidence is headquartered in Cambridge, United States. It is registered at Cambridge, Massachusetts, United States.
OpenEvidence is a funded company, having raised a total of $985M across 12 funding rounds to date. The company's 1st funding round was a Grant of $88.83K, raised on Jan 2015.
OpenEvidence has 145 employees.
OpenEvidence was founded in 2021 in Cambridge, United States, as an AI-powered platform in the healthcare sector. Clinically relevant evidence from peer-reviewed literature is aggregated, synthesized, and visualized to support healthcare professionals. Access to accurate medical information is facilitated, aiding informed decision-making in clinical practice. Operations focus on enhancing usability of medical resources for professionals in the field.
OpenEvidence's top competitors include Nested Knowledge, Copient Health and iDoctus.
OpenEvidence offers OpenEvidence App.
OpenEvidence has 25 investors. Key investors include Nvidia, Craft, Kleiner Perkins, Blackstone, and Mayo Clinic.
The valuation of OpenEvidence is $15B as of Sep 2026.
Yes. OpenEvidence publishes OpenEvidence and 1 more app, with over 100,000 downloads.
The website of OpenEvidence receives about 8.1 million visits a month and ranks #8,901 among all websites worldwide.