A specialist and a generalist
ChatGPT can do a thousand things. Summarizing is one of them, and it does it well when you give it the material and a clear instruction.
SumAI does one family of things: it takes a YouTube video, a web article or a PDF and turns it into something you can read, navigate, question and study. The result has the same shape every time, which is the point.
YouTube: read the fine print
This is where the two differ most on a phone.
SumAI takes a YouTube link, or a share from the YouTube app, and works from the video’s captions. You get a summary, chapters, key moments, the transcript and Ask AI.
ChatGPT’s documented YouTube capability, as of November 2026, lives in its browser extension. OpenAI’s documentation describes opening a video in a supported desktop browser and asking about it in the side chat, where ChatGPT can use the timestamped transcript if the video has captions. That was added in July 2026.
OpenAI does not document pasting a YouTube link into the normal chat on mobile and getting a transcript-based summary. It may work sometimes. We could not confirm it, and we would not plan a workflow around it. What always works is pasting the transcript text yourself.
So if you watch YouTube at a desk with ChatGPT’s extension installed, it is a strong option. If you want to summarize a video from your phone in two taps, that is what SumAI is for.
PDFs: both work, differently
Both handle PDFs. The differences are in the details.
ChatGPT accepts a PDF as an upload and, according to OpenAI, can analyze both the text and the images in it, which matters for documents full of charts. Free accounts are limited to three file uploads a day.
SumAI reads the text of a PDF with selectable text and produces a summary in one of five styles, then builds a mind map, quiz and flashcards from it. It does not read charts or images.
For a figure-heavy report, ChatGPT has the advantage. For a paper or chapter you need to learn, SumAI’s study tools arrive without being asked for.
Prompting versus choosing
With ChatGPT, the quality of a summary depends on the prompt. That is power if you want it: a summary as a table, a critique of the argument, a version for a ten-year-old.
With SumAI, you choose a style (TL;DR, Standard, Detailed, Study Guide, Chapters) and a language. There is less to control and nothing to get wrong.
Study features
Both have moved toward studying. ChatGPT has built-in flashcards and a study mode that works through material with you. SumAI generates a quiz and flashcards for every summary, plus a mind map.
If you want an interactive tutor, ChatGPT’s study mode is the closer fit. If you want a summary, a map and a test from a single link, SumAI gets you there faster.
Whichever you use
Both are AI systems, and both can state something the source did not quite say. For anything you will rely on, check the original. SumAI’s timestamps and transcript are designed to make that quick for videos.
