Email Thread Visualizer for Gmail and Outlook
To visualize an email thread, open it in Gmail or Outlook Web and click Mail2Action. The Chrome extension turns the thread into a timeline of who said what and when, a reply tree of who answered whom, or a decision flowchart — right next to your inbox, with AI included and nothing to copy or paste.
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Add to Chrome — It's FreeHow do I see an email thread as a timeline?
The Thread Timeline draws the conversation as a sequence diagram: one column per person, one arrow per message, dated and summarized in a few words. People from the same company are grouped together, and the moments where the thread reached a conclusion are highlighted as notes. You see in seconds where opinions changed and who moved the discussion forward.
How do I see who replied to whom?
Long threads branch: someone answers an older message, a side discussion starts, two people argue past each other. The Reply Tree indents every reply under the message it answers, so you see each branch. Each reply gets a stance label — question, info, propose, object, agree, or decide — so you can find objections and decisions without reading every message.
Can I turn an email thread into a flowchart?
Yes. The Decision Flowchart extracts what was decided, who owns each step, the deadlines, and the if/else paths (“if the beta goes well, start Phase 2; if we see sync problems, revisit the design”). It is the fastest way to brief someone who was not on the thread.
How does it work?
- Install Mail2Action from the Chrome Web Store (free).
- Open any email thread in Gmail or Outlook Web.
- Click the Mail2Action button and pick a view: Summary, Actions, Timeline, Tree, or Decisions.
AI is included — 30 runs a month on the free plan, no API key needed. If you prefer, add your own key for OpenAI, Google Gemini, Anthropic Claude, or xAI Grok for unlimited runs. Need the text version instead? See how to summarize an email thread and pull out action items.
How is this different from other email visualization tools?
Most thread-visualization tools are built for legal e-discovery or require you to paste the email into a separate app. Mail2Action works inside the inbox you already use, on a single thread, in one click — and combines visuals with a written summary and a list of action items with owners and due dates.