| Primary purpose | Rank Amazon listings by computed price per unit across a category. | Track Amazon price history for specific ASINs. |
| Question it answers | "Which listing in this category is cheapest per unit right now?" | "Is today a good time to buy this specific listing?" |
| Coverage | Amazon US, 50+ household and consumer-goods categories ranked by computed PPU. | Amazon US, all ASINs (lookup-based, not category-based). |
| Data source | Amazon Product Advertising API (live) plus Dealophant's price history database for trend context. | Web scrape and merchant-feed-based price history. |
| Ranking | Across a category, by lowest price per unit. | Within a single ASIN, by date. |
| Price drop alerts | On the roadmap. | Yes (Wishlist Alerts). |
| Per-unit normalization | Yes, automated for every listing using a regex parser plus LLM classifier. | No automatic per-unit normalization. |
| Account required | No. | No for browsing; yes for alerts. |
| Cost | Free. | Free; ad-supported. |