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The category splits by input type: document summarizers like AI PDF Summarizer and IntelliPPT work on uploaded files, while tools like LightFeed and Summary Box process URLs or feeds. AudioBriefly and Speech to Note target audio input specifically. When choosing, match the tool to your primary source type. Accuracy on technical or domain-specific content varies significantly, so a trial on your actual materials is more useful than benchmark comparisons. Output length control matters: some tools offer one-sentence, bullet, or paragraph summaries; others return a fixed format. For team use, check whether summaries can be shared or exported to collaboration tools. Pricing is usually credit-based for per-document tools, or subscription-based for regular feed monitoring.