Automation library · Alerts and monitoring

Send webpage change alerts with Browserless and Google Drive

Started by a clock, and works across Gmail, Google Drive and n8n data table. It hands the judgement calls to Gemini. 17 steps, 1 branch: a working afternoon to understand properly.

MediumCalls a model: Gemini

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17 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
3Services it connects to

The flow

Starts it 1Model 1Logic 4Service 11

The steps in the order they run, from what starts it.

  1. 1Check on a scheduleSchedule triggerStarts it
  2. 2Configuration (edit this first)SetLogic
  3. 3Ensure state table existsData TableService
  4. 4Capture current screenshotBrowserlessService
  5. 5Archive screenshot to DriveGoogle DriveService
  6. 6Check: first time watching this URL?Data TableService
  7. 7Check: seen this URL before?Data TableService
  8. 8Save first screenshot as baselineData TableService
  9. 9Look up last screenshot IDData TableService
  10. 10Email: baseline capturedGmailService
  11. 11Download previous screenshotGoogle DriveService
  12. 12Combine current and previous imagesCodeLogic
  13. 13Compare screenshots with AIGoogle GeminiModel
  14. 14Update last-checked stateData TableService
  15. 15Did the AI detect a meaningful change?IfLogic
  16. 16Email: change alertGmailService
  17. 17No meaningful change - nothing to doNo OpLogic

How it's built

Starts on
A clock
Steps
17, with 1 branch
Size
Medium: a working afternoon
Connects to
Gmail, Google Drive, n8n data table
Model
Gemini

Questions

What does it need to run?

An n8n account, plus your own Gmail and Google Drive accounts, and a key for Gemini. You connect your own accounts after importing it; none are included.

What starts it?

It starts on a clock.

Does it use AI?

Yes. It calls Gemini. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 17 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 17 steps before you point it at anything that matters.