Summary Cat, a YouTube Video Summary Generator
Hello HN! Please check out Summary Cat (https://www.summarycat.com). It uses OpenAI's GPT-3.5 to summarize YouTube transcripts. Please note that it only works for - *English* videos. - videos that are not too long in length. I'd appreciate any feedbacks, criticisms, or feature requests!! You can also find my contact info in my profile. Thank you in advance. ------------Technical Details--------------- Tech Stack - Frontend: HTML/CSS - Backend: Python/Flask APIs: - For grabbing YouTube's transcripts: I used youtube-transcript-api…
In plain words
Summary Cat is a YouTube video summarizer that uses OpenAI's GPT-3.5 to generate concise summaries from video transcripts. It works with English-language videos of moderate length and extracts transcripts before processing them through the language model. The tool features a simple HTML/CSS frontend with a Python/Flask backend, making it accessible for viewers who want quick summaries without watching full videos.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hello HN! Please check out Summary Cat (https://www.summarycat.com). It uses OpenAI's GPT-3.5 to summarize YouTube transcripts. Please note that it only works for - *English* videos. - videos that are not too long in length. I'd appreciate any feedbacks, criticisms, or feature requests!! You can also find my contact info in my profile. Thank you in advance. ------------Technical Details--------------- Tech Stack - Frontend: HTML/CSS - Backend: Python/Flask APIs: - For grabbing YouTube's transcripts: I used youtube-transcript-api (https://pypi.org/project/youtube-transcript-api/) - For summarizing the transcripts: I used OpenAI's GPT-3.5-turbo-16k: https://platform.openai.com/docs/guides/gpt. - I used GPT-3.5 because GPT-4 is quite a lot more expensive (roughly 10X). My Prompt (Super Simple!) - "please summarize the following text into a few paragraphs:" + the full transcript. Thoughts about GPT-4 vs GPT-3.5-Turbo-16k for Summary Cat - GPT-4 was 20% better for "summary quality" - GPT-4 feels 50% faster - However, GPT-4 is about 10X as expensive as GPT-3.5 - Winner: GPT-3.5-Turbo-16k
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