1. Data Sources: One key difference between Graphite and Splunk Cloud is that Graphite primarily focuses on time-series data while Splunk Cloud can handle a wide variety of data formats including machine data, log files, and metrics from different sources.
2. Storage and Scalability: Graphite uses Whisper as its database storage engine which can limit its scalability compared to Splunk Cloud which offers high scalability with its distributed architecture and indexing capabilities.
3. Querying Capabilities: Splunk Cloud provides a powerful search and querying language that allows users to run complex searches and correlations across large datasets, while Graphite has more limited querying capabilities focused on time-series data.
4. User Interface: Splunk Cloud has a user-friendly and intuitive web interface that simplifies the search and analysis of data, while Graphite typically requires users to write scripts or use third-party tools for data visualization and analytics.
5. Cost: Splunk Cloud is a commercial solution with subscription-based pricing, whereas Graphite is an open-source tool which may require more configuration and maintenance efforts but is cost-effective for smaller organizations or projects.
6. Community Support: Graphite has a strong open-source community that actively contributes to its development and offers a variety of plugins and extensions, while Splunk Cloud has a more centralized support system with dedicated customer service.

In Summary, Graphite and Splunk Cloud differ in terms of their data sources, storage, scalability, querying capabilities, user interface, cost, and community support.