For the longest time, I never paid much attention to audio summary features in the AI tools I use, such as NotebookLM’s Audio Overviews. I usually skim text summaries or the original sources faster than the speed at which an audio clip plays. So the idea of sitting through an audio summary just never really appealed to me.
But I started rethinking it lately - I spend most of my time at my desk wearing noise-canceling headphones anyway, mainly to block background noise while working. So it dawned on me that audio overviews might actually make sense in this situation, especially for longer documents or topics I’m trying to tackle while juggling a million other things in my browser. This is what made me give Google’s Illuminate tool a try… and now I open it almost every day.
What is Google Illuminate?
An audio-focused AI summarization tool
Illuminate is an experimental research tool from Google that turns written material into short AI-generated discussions. It was primarily designed to make academic research more accessible by turning dense scientific papers into a more captivating and engaging format. But you can use it for anything on the web.
The project currently lives in Google Labs, so it’s still in the experimental phase. Tools that appear there often focus on new ways to interact with information rather than acting as polished, finished products. And Illuminate falls into that category. The goal isn’t to replace reading, but simply to give users a more approachable way to get through dense and technical materials.
It analyzes weblinks by fetching and processing the content from publicly accessible URLs, such as open-access articles and research papers from arXiv.org. But it’s not just for research papers - Illuminate can parse and process content from any weblink as long as it’s not paywalled or from a site that opted out of AI indexing. And then it uses Gemini to analyze the content and turn it into interactive audio discussions.
Illuminate is like NotebookLM’s Audio Overviews, but better
It’s built for audio summaries, and has better interactive features
The first thing I noticed and loved when I started using Illuminate was how integrated the search function is. NotebookLM has web search too, but it doesn’t use it by default; you need to intentionally select the feature. Illuminate, on the other hand, lets you search for research papers (primarily from arXiv.org) right in the same address bar where you paste your links. A window with a curated list of papers will pop up, and you can add multiple of the relevant ones to a single session. Of course, Illuminate also lets you add your own weblinks, as long as the content is public.
It also gives you a dialogue and voice customization toolkit so you can personalize the audio to your liking. This includes different speech styles such as casual or formal, and various vocal tone and pitch selections. And you can adjust the playback speed once the audio is rendered. Having more control over what the audio sounds like actually makes me want to use it, unlike other audio overview tools. I love that it comes with an interactive transcript - this is the feature that sold me, because I can click anywhere on the script and the audio will jump to that part. It’s similar to how Gistr works, and it means I don’t have to scrub the timeline playhead to get to a specific part.
Illuminate is an AI tool that uses RAG, so it also lets you chat with your sources. You’ll find this option via the hand icon at the bottom. Similar to NotebookLM, it comes with preset prompts based on the content, but you can provide your own prompts too. The responses are text-based and have playable audio as well. This is where I spend most of my time in Illuminate - just the act of listening, pausing, asking a question, and rewinding helps me retain information better than a plain text response.
Furthermore, Illuminate keeps all your audio sessions in one library, making them easier to find than searching through multiple notebooks. It also has a public library of audio overviews which anyone can access and interact with. These are curated overviews consisting of famous books and research papers.
Where Illuminate falls short
It’s a starting point for understanding, not a replacement
Illuminate doesn’t allow any document or media input, so you can’t summarize sources that aren’t weblinks. It also doesn’t retain your audio overviews for longer than 30 days, forcing you to download them if you want to continue having access to them. Lastly, and probably most importantly, some nuances or complex methodologies may get oversimplified in the transcript, so ideally, you still need to read the research yourself.
Research in a podcast format
I originally overlooked Illuminate for the same reason I ignore most audio summaries - reading is simply faster for me. But Illuminate changed that approach. Listening, while reading, while also asking questions at the same time, really helps me be more interactive and focused on the topic, and it keeps the learning process somewhat novel.