Both Kibana and Grafana are data visualization tools providing users capabilities to explore, analyze and visualize data with dashboards. The difference between Kibana and Grafana lies in their genesis. Kibana was built on top of the Elasticsearch stack, famous for log analysis and management. In comparison, Grafana was created mainly for metrics monitoring supporting visualization for time-series databases.
While Kibana is proficeint in visualizing log data from Elasticsearch, Grafana is more of a general-purpose data visualization tool with a special focus on metrics visualization.