ORCID vs ResearcherID vs Scopus Author ID: Comparing Researcher Identifier Systems

ORCID is the open, non-proprietary researcher ID that has become the interoperable standard for author disambiguation, in contrast to Scopus Author ID (auto-generated inside Elsevier’s Scopus database) and the now-retired ResearcherID (Clarivate’s Web of Science identifier, folded into Web of Science Researcher Profiles). All three solve the same problem — telling researchers with similar names apart — but only ORCID is designed to travel with a person across publishers, funders, and institutions.

ORCID (Open Researcher and Contributor ID) is a free, persistent 16-digit identifier that a researcher registers and controls independently of any single database, publisher, or employer.

• What is ORCID, and why did it become the interoperable standard?
• How does ResearcherID compare, and why was it retired?
• What is Scopus Author ID, and how does it differ from ORCID?
• ORCID vs ResearcherID vs Scopus Author ID at a glance
• Where do legacy identifiers still surface?
• Frequently asked questions
• The outlook for researcher identifiers

What Is ORCID, and Why Did It Become the Interoperable Standard?

ORCID Inc. is a US-based non-profit that opened its registry in October 2012, governed by a multi-stakeholder board drawn from publishers, funders, and universities rather than by a single commercial owner. That governance structure is the core reason ORCID displaced proprietary alternatives as the default researcher identifier.

Each ORCID iD uses a checksum built on ISO/IEC 7064:2003 (MOD 11-2), the same check-digit family used by ISNI under ISO 27729, which is why ORCID iDs validate cleanly across systems that also recognise ISNI records. That technical interoperability, not just the free registration, is what lets an ORCID iD move between a journal submission form, a grant portal, and a university CRIS without manual re-entry.

• Persistent and portable across employers, name changes, and career stage.
• Free for the individual to register, claim, and control.
• Interoperable via Crossref auto-update, DataCite metadata, and institutional CRIS/RIM systems.
• Increasingly mandated by funders, including the Wellcome Trust and the NIHR, which require an ORCID iD in grant applications.
• Openly governed under a non-profit board, unlike vendor-owned author IDs.

UK research policy is accelerating this shift further: UKRI guidance has flagged ORCID iDs as an expected requirement for output submissions under the REF cycle following REF 2021, and university library services report that more than 1,500 journals already require an ORCID iD at submission.

How Does ResearcherID Compare, and Why Was It Retired?

ResearcherID was introduced in 2008 by Thomson Reuters (later Clarivate) as an identifier tied specifically to the Web of Science citation database. A researcher registered for a ResearcherID number, formatted like A-1234-2008, and it pulled in their Web of Science-indexed publications and citation counts.

In 2019, Clarivate integrated ResearcherID with Publons, its peer-review recognition platform. Clarivate subsequently retired ResearcherID as a standalone, self-service brand, migrating existing profiles into Web of Science Researcher Profiles, which now performs the identification and citation-tracking role ResearcherID used to handle. Old ResearcherID numbers still resolve and still appear embedded in legacy CVs, grant records, and citation reports, but new researchers no longer register for one directly.

ResearcherID publications can still be exported into an ORCID record through the Web of Science profile’s data-exchange tool, which is the main reason the identifier remains relevant: as a feed into ORCID, not as a destination in its own right.

What Is Scopus Author ID, and How Does It Differ from ORCID?

Scopus Author ID is not something a researcher creates. Elsevier’s Scopus database automatically assigns a numeric author ID, formatted like 7404933229, once an author has publications indexed in the database, then groups their output under that profile using a name-matching algorithm.

Because the ID is algorithm-generated, it is prone to the exact ambiguity problem ORCID was built to solve: name variants, institutional affiliation changes, and common surnames routinely cause split profiles (one researcher assigned two IDs) or merged profiles (two researchers sharing one ID). Elsevier provides a Scopus Author Feedback Wizard so researchers can request corrections, splits, and merges, but the identifier itself remains proprietary to Scopus and does not port to other databases.

Linking a Scopus Author ID to an ORCID iD synchronises publication data and improves visibility across platforms, but the underlying Scopus number only ever functions inside the Elsevier ecosystem — Scopus, SciVal, and Mendeley.

ORCID vs ResearcherID vs Scopus Author ID at a Glance

The table below summarises where each identifier sits on governance, creation, and current status.

Where Do Legacy Identifiers Still Surface — and What Should Institutions Do?

Legacy ResearcherID numbers still turn up in older CVs, funder records, and Web of Science citation reports, so institutional research offices reconciling historical publication data need to map those numbers rather than assume every record already carries an ORCID iD. Scopus Author ID persists for a similar reason: Elsevier’s internal analytics tools, including SciVal, still key on it, so institutions benchmarking research output through Scopus must keep Scopus profiles clean even after adopting ORCID as the primary identifier.

The practical fix in both cases is the same: use ORCID’s “Search & Link” wizard to pull ResearcherID and Scopus publication records into a single ORCID iD, rather than maintaining three separate identities. This is also where ORCID intersects with contributor-role standards — an ORCID iD tells a system who a researcher is, while CRediT contributor roles record what that researcher actually did on a given output, and the two are increasingly captured together in submission workflows. Research administration teams responsible for institutional CRIS and RIM systems typically own this reconciliation work; see CASRAI’s broader research administration resources for how identifier data feeds compliance and reporting.

Frequently Asked Questions

Is ORCID a Researcher ID?

Yes. ORCID is a researcher identifier — specifically, a free, persistent 16-digit ID that a researcher registers and controls themselves. It functions as the interoperable, cross-publisher alternative to database-specific IDs like Scopus Author ID or the retired ResearcherID.

Is ResearcherID the Same as ORCID?

No. ResearcherID was Clarivate’s identifier tied to the Web of Science database, now retired and merged into Web of Science Researcher Profiles. ORCID is an independent, non-profit-governed identifier that works across every publisher and database, including Web of Science and Scopus.

How Do I Get My Researcher ID?

Register free at orcid.org in under a minute to obtain an ORCID iD — the researcher ID now expected by most funders and journals. A Scopus Author ID is instead auto-assigned once Elsevier indexes your work, and legacy ResearcherID profiles are accessed via Web of Science Researcher Profiles.

What Is a ResearcherID?

A ResearcherID was a Clarivate-issued number linking a researcher to their Web of Science-indexed publications and citation counts. Introduced in 2008 and merged with Publons in 2019, it was later retired as a standalone system in favour of Web of Science Researcher Profiles.

The Outlook for Researcher Identifiers

The direction of travel is now well established: ORCID functions as the connective spine identifier, while database-specific IDs like Scopus Author ID and the retired ResearcherID feed publication data into it rather than compete with it. DataCite’s metadata schema recommends attaching ORCID iDs to dataset creators, extending the identifier’s reach beyond journal articles into data and software outputs. As funders and REF-cycle policy continue tightening ORCID expectations, institutions gain more by consolidating identifiers into one interoperable ORCID record than by maintaining three separate, database-locked profiles.