1. Data Sources: Grafana supports a wide range of data sources, including Prometheus, Elasticsearch, InfluxDB, and more, while Librato has a limited number of supported data sources, mainly focusing on metrics from applications and infrastructure. 2. Alerting Capabilities: Grafana provides robust alerting features that allow users to set up alerts based on defined thresholds and conditions, while Librato's alerting capabilities are more basic and may require additional setup for complex alerting scenarios. 3. Visualization Options: Grafana offers a variety of visualization options, including graphs, tables, heatmaps, and more, allowing users to create customized dashboards, while Librato focuses more on pre-built visualization templates tailored for specific use cases. 4. Community Support: Grafana has a large and active community with extensive documentation, plugins, and community-contributed dashboards, while Librato has a smaller community and may have fewer resources available for troubleshooting and support. 5. Pricing Model: Grafana is open source and free to use, with the option to purchase a support subscription, while Librato is a subscription-based service with tiered pricing based on the number of metrics and users. 6. Integration with Other Tools: Grafana can easily integrate with various third-party tools and services through its plugins and APIs, whereas Librato's integrations may be more limited in comparison.

In Summary, Grafana offers more flexibility, community support, and integration options compared to Librato, which has a focus on specialized metrics visualization and simpler alerting capabilities.