Isnad offers free access to a database of interlinked rawi profiles, ahadith entries, and various asma al-rijaal. This service is still in the alpha stage meaning that many features are yet to be built, and that our database may have some inaccuracies. Note that in the coming months, isnad.io will be undergoing major changes as a new version is being phased in.
Isnad should be thought of as a helpful aid in your hadith research, rather than an authoritative source. We encourage users to contact us with their feedback, which will help us build a better platform together.