Built for different screens
Eightify grew up in the browser. Its Chrome extension, which its store listing says has 200,000 users, puts a summary next to the video you are watching on YouTube. For people who do their watching on a laptop, that placement is hard to beat: no copying links, no switching apps.
SumAI is built for the phone. You paste a link or share from the YouTube app, and everything happens in a native iPhone and iPad app.
Both approaches are sensible. The first question to ask is simply where you watch.
What Eightify does well
- In-page summaries on desktop. The summary appears where you already are.
- Android support. SumAI has no Android app.
- Comment overview. Eightify summarizes a video’s top comments, which can tell you quickly whether viewers found it accurate or useful. SumAI does not do this.
- Focus. It does one thing: YouTube.
What SumAI adds
- More than YouTube. Web articles and PDFs go into the same library as videos.
- Ask AI. A chat with the video, with timestamps in the answers. Eightify’s site does not list a chat feature.
- Study tools. A mind map, a quiz and flashcards for every summary. Eightify’s site does not list these.
- Five summary styles, including a Study Guide and a Chapters style for long videos.
- Export as PDF or Markdown.
A note on the iPhone apps
Both products have iPhone apps. As of 12 November 2026, the App Store shows Eightify’s iPhone app as last updated on 3 April 2025, while its Chrome extension was updated in November 2026. An app that has not changed recently can still work well, so treat this as one data point rather than a verdict.
SumAI’s current version, 2.0, was released on 26 October 2026.
Price
Eightify has no public pricing page on its website; plans appear after sign-in. The figures in the table are the in-app purchase prices shown in the US App Store, and its Chrome listing describes a 7-day free trial. We could not confirm what, if anything, Eightify offers free after the trial.
SumAI is free to download with an optional Premium subscription.
What they have in common
Both work from a video’s captions, so neither can summarize a video that has none. And both produce AI summaries, which are a fast way in and worth checking against the video when a detail matters.
