DupeCatcher

DupeCatcher is a free Salesforce app that blocks duplicate leads, contacts and accounts at the point of entry. It runs in real time when records are created manually, updated, converted, or arrive through web forms. Users define filters and rules using standard or custom Salesforce fields with different matching styles, and can block duplicates, send alerts, or override blocks to create new unique records. When duplicates are detected, records can be merged or converted into a single record. The app installs natively inside a Salesforce org and works in both Classic and Lightning.