SumAI guides : Learn faster, on purpose.
Practical guides on summarizing YouTube videos, PDFs and articles, and on turning what you watch and read into knowledge that lasts. Sourced, dated, and honest about what AI can and cannot do.
Guides
Step-by-step instructions for summarizing videos, PDFs and web pages.
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How to Chat With a PDF on iPhone and Check the Answers
Ask questions about a PDF on iPhone with ChatGPT, Claude, Gemini Notebook, ChatPDF or SumAI. How to phrase questions, verify answers and work within limits.
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How to Get and Copy a YouTube Transcript on iPhone
Open a YouTube video's transcript on iPhone with Show transcript, find out why the mobile website has none, and see the practical ways to copy the text.
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How to Summarize a PDF on iPhone: 5 Ways (2026)
Five ways to summarize a PDF on iPhone as of November 2026: Apple Intelligence, AI assistants, Gemini Notebook, PDF tools and SumAI, with documented limits.
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How to Summarize a Web Page or Article on iPhone
Summarize an article on iPhone with Safari's built-in Summarize, Writing Tools or by sharing the page to SumAI. Requirements, steps and paywall limits.
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How to Summarize a YouTube Video: 6 Ways That Work
Six ways to summarize a YouTube video with AI as of November 2026: the transcript, Ask YouTube, Gemini, ChatGPT, browser extensions and iPhone apps, compared.
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How to Summarize a 3-Hour YouTube Video or Podcast
A step-by-step method for long YouTube videos and video podcasts: outline first, watch the 2 to 4 sections that matter, ask targeted questions, then verify.
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How to Summarize a YouTube Video in Another Language
Get an English summary of a Japanese YouTube video, or the reverse. How captions, auto-translate and output languages work, with iPhone steps for SumAI.
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Study
Turning what you watch and read into things you remember.
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How to Study from YouTube Lectures and Remember Them
An evidence-based routine for learning from lecture videos: preview the structure, watch actively, test yourself, space your reviews and explain it back.
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How to Make a Mind Map from a YouTube Video or PDF
Turn a video or PDF into a mind map by hand or with AI, see what research on concept maps and mind maps shows, and learn why redrawing the map matters.
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How to Turn YouTube Videos into Flashcards and Quizzes
How to make flashcards or a quiz from a YouTube video or PDF as of November 2026: the tools that do it, what makes a good card, and why testing works.
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Explainers
How AI summaries work, how far to trust them, and what they save.
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How Accurate Are AI Summaries? What Studies Show
AI summaries can add unsupported claims or over-generalize. See what benchmarks and peer-reviewed studies found, with caveats, and how to check a summary.
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How Much Time Does an AI Summary Save? The Math
A 60-minute video holds about 9,000 to 10,200 spoken words. See the math for reading the transcript, reading a summary, and watching at 1.5x or 2x.
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TL;DR vs Detailed vs Study Guide: Which Summary to Use
How long a summary should be depends on your goal. Compare TL;DR, key points, detailed, study guide and chapter summaries, and match each one to a task.
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Why AI Can't Summarize Some YouTube Videos (and Fixes)
AI summarizers read a YouTube video's captions. Here are the verified reasons a video fails, from missing captions to live streams, and what to do about each.
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Comparisons
Fair, dated roundups of the tools in this space.
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Best YouTube Summarizer Apps for iPhone (2026)
Nine ways to summarize YouTube videos on iPhone, compared by sources, study tools, platforms and price as of November 2026, with who each one suits.
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Gemini Notebook (NotebookLM) Alternatives for iPhone
Gemini Notebook is the right tool for many people. See when an iPhone alternative fits better, and how SumAI, ChatGPT, Claude, Recall and study apps compare.
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Get SumAI
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- iPhone and iPad
- Requires iOS 16 or later
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