Before ORCID was developed, some database providers developed approaches to author disambiguation. ResearcherID (developed by Thomas Reuters, now Clarivate, and used in Web of Science) and Scopus Author ID (developed by Elsevier and used in Scopus) are two examples of these efforts. Whereas ORCID is "a platform-agnostic identifier," ResearcherID and Scopus Author ID are connected to proprietary, subscription-based systems.
In April 2019, ResearcherID was integrated with Publons, a Clarivate Analytics (also producer of EndNote) owned platform, where researchers can track their publications, peer reviewing activity, and journal editing work. With ResearcherID now hosted on Publons researchers can keep a more comprehensive view of their research output and contributions in one place.
ResearcherID is a unique identifier to enable researchers to manage their publication lists, track citations and h-index, identify potential collaborators and avoid author misidentification. In addition, data associated with a ResearcherID can be exchanged with ORCID.
Tips on building your ORCID profile can be found here
There are three ways to add works to your ORCID profile: