1. Pricing Model: Nudgify operates on a subscription-based model with various pricing tiers based on the number of nudges and websites, while ProveSource offers a more flexible pay-as-you-go pricing, enabling users to pay only for the amount of time their campaigns run without any subscription commitment.

2. Features: Nudgify focuses on social proof notifications like recent sales pop-ups, whereas ProveSource offers a wider range of social proof types including live visitor count, conversions, reviews, and more, making it a more versatile tool for businesses looking to build credibility.

3. Customization Options: Nudgify provides limited customization options for designs and notifications, while ProveSource allows users more control over the appearance and behavior of their social proof notifications, making it more adaptable to branding and marketing strategies.

4. Integration: Nudgify offers integration with popular e-commerce platforms like Shopify and WooCommerce, but ProveSource provides a wider array of integrations with tools such as Zapier, Slack, and Google Analytics, offering users more flexibility in connecting with their existing workflows.

5. Analytics: Nudgify provides basic analytics on click-through rates and impressions for its notifications, while ProveSource offers more comprehensive data insights such as conversion rates, engagement metrics, and campaign performance, allowing businesses to make data-driven decisions for their social proof strategies.

6. Customer Support: Nudgify offers email support during business hours, while ProveSource provides 24/7 live chat and email support, ensuring users have round-the-clock assistance in case of any issues or queries.

In Summary, Nudgify and ProveSource differ in their pricing models, features, customization options, integrations, analytics offerings, and customer support, making each platform suitable for different business needs and preferences.