1. Integration Platforms: Fomo offers integrations with popular platforms like Shopify, WooCommerce, and Slack, while ProveSource integrates with Shopify, WordPress, and Zapier, providing users with more flexibility in connecting their tools.

2. Customization Options: Fomo provides extensive customization options for display settings, notifications, and styling, allowing users to tailor the appearance to their brand, whereas ProveSource offers limited customization, mainly focusing on the content and data displayed.

3. Social Proof Types: Fomo primarily focuses on creating social proof through recent activity notifications and customer reviews, while ProveSource specializes in real-time website notifications, social count notifications, and visitor behavior tracking, providing a broader range of social proof displays.

4. Data Analytics: Fomo offers basic data analytics and reporting tools to track the performance of notifications, views, and clicks, while ProveSource provides advanced analytics, including conversion tracking, heatmaps, and A/B testing, enabling users to gain deeper insights into their social proof campaigns.

5. Pricing Models: Fomo offers tiered pricing plans based on the number of notifications and features required, whereas ProveSource offers a straightforward pricing structure based on the volume of unique visitors, making it easier for users to choose the most suitable plan for their needs.

In Summary, Fomo and ProveSource differ in their integration platforms, customization options, social proof types, data analytics, and pricing models.