Pro

1. Comprehensive Price History Charts: Keepa offers detailed price history graphs for millions of Amazon products, enabling users to spot pricing trends and make informed purchasing decisions based on historical data, potentially saving money and avoiding overpriced items.

2. Deal Discovery: Keepa identifies and presents deals quickly, showcasing price drops and discounts. Users can set up personalized deal alerts for their favorite products, ensuring they never miss a price reduction or a flash sale on items they're interested in.

3. Price Drop Alerts: By tracking desired products, Keepa sends notifications when prices fall below set thresholds. This feature helps users purchase at optimal prices without the need to constantly check Amazon for updates, saving both time and money.

Con

1. Limited Free Features: Keepa offers essential tracking services for free, but the most powerful features, including detailed historical data and advanced notification options, require a paid subscription, which can be a barrier for casual users or individuals looking for a no-cost solution.

2. Learning Curve: Keepa's interface and plethora of data points may be overwhelming to new users. Its comprehensive charts and variety of information require some time to understand fully, potentially deterring those who prefer a more straightforward, user-friendly experience.

3. Platform Specificity: Keepa primarily focuses on tracking prices on Amazon, which is limiting for users who shop across multiple online platforms. It doesn't provide price comparison features with other retailers, which could be a significant drawback for users interested in getting the best deal across the web.