GlenSum vs ChatGPT-based summarizer extensions: which one exports mind maps?

Comparison · Updated September 2026

Search the Chrome Web Store for "summarizer" and you'll find hundreds of extensions, most of them the same animal: a thin wrapper that grabs the page text, pastes it into ChatGPT, and shows you the reply. Some are fine. But a summary in a chat bubble is where most of them stop — and that's exactly where real reading workflows begin.

The summary is the easy part

Any extension with API access can produce a decent paragraph-level summary. The model does the work, not the tool. So when comparing summarizers, the useful questions are all about what happens around the summary:

1. Structure. Does it organize output into headings and key points you can scan, or one wall of text?
2. Export. Can you get the result out — as Markdown for Obsidian, as a PDF, as a mind map — or do you copy-paste from a popup forever?
3. Reuse. Can it batch-process a set of tabs, import a local PDF, or re-summarize at different lengths?
4. Data flow. Does page content route through the extension's servers, or directly to your own AI provider?

Where generic ChatGPT wrappers fall short

• No structure. Raw chat output isn't built for scanning; you reformat it yourself.
• No real export. Copy-paste is the only exit. Nothing lands in your notes app in usable form.
• One page at a time. No batch queue, no local file handling.
• Fixed context. Most wrappers send the page to the model without letting you choose the model, length, or language of the output.

What GlenSum does differently

GlenSum was built around those four questions rather than around the chat box:

• Structured output by default — summaries come back organized into headings and bullet points, ready to scan.
• Exports that go somewhere — Markdown, high-res PDF, and mind-map export: the summary's structure becomes a visual map you can drop into your notes.
• Batch mode — queue every tab in your window and get summaries while you do something else. Local PDFs import directly.
• Your model, your key — BYOK support for OpenAI, DeepSeek, or any OpenAI-compatible endpoint, plus free built-in models to start. Page content goes to your provider, not through our servers.

And unlike most free summarizers, it isn't a lead magnet for a monthly plan: Pro is $9.99 once.

The honest takeaway

If you summarize a page once a week, a free ChatGPT wrapper is fine. If reading is part of your job — research, competitive analysis, study, content work — the difference between "a chat reply" and "structured, exportable, batchable output" compounds daily. That gap is the whole product.