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Get an alert when a price on a page drops

Point it at the price on a product page. While the page is open, you get a notification the moment the price goes below the last one it saw.

Intermediate 8 min No setup Monitor pages

workflow · price-on-page-watch.awf 6 steps

Price On Page Watch: a workflow with 6 steps, starting with When the price changes and ending with Remember this price.

  1. When the price changes(Element Change — open its doc page)
  2. Read the price(Regex — open its doc page)
  3. Read last price(Data Store — open its doc page)
  4. Did the price drop?(IF — open its doc page)
  5. Show the drop alert(Show Notification — open its doc page) if true
  6. Remember this price(Data Store — open its doc page)
Open in AWFlow
The price changes → read the number → compare with the last one → notify if it dropped → remember it.

How it works

Section titled “How it works”

  1. Watch the price element

    Element Changenode reference

    Element Change watches the element matching .price on every page (URL Patterns <all_urls>) and fires when its text changes, after 500 ms of quiet.

    Make it yours — click the crosshair in CSS Selectors to pick the price on your product page, and set URL Patterns to that shop, for example https://shop.example.com/product/*.

    Step 1, close-up of the app: The CSS Selectors list, outlined.Step 1, close-up of the app: The CSS Selectors list, outlined.Full screen: the whole screenshot for step 1
    The CSS Selectors list
    The settings of the When the price changes trigger (Element Change): an empty CSS Selectors list with Add, Fire when, Match text, Debounce (ms) and URL Patterns.The settings of the When the price changes trigger (Element Change): an empty CSS Selectors list with Add, Fire when, Match text, Debounce (ms) and URL Patterns.

  2. Read the number

    Regexnode reference

    Regex Match finds the first number (such as 79.99) in the changed text and puts it in priceMatch.

    Make it yours — for prices written 1.299,00, change Pattern to match your format.

    Step 2, close-up of the app: The Pattern field, outlined.Step 2, close-up of the app: The Pattern field, outlined.Full screen: the whole screenshot for step 2
    The Pattern field
    The settings of the Read the price step: Pattern, Maximum Matches and Put Result In Field.The settings of the Read the price step: Pattern, Maximum Matches and Put Result In Field.

  3. Look up the last price

    Data Storenode reference

    Data Store Get reads last-price, saved by earlier runs of this workflow.

    Step 3, close-up of the app: Read last price, outlined.Step 3, close-up of the app: Read last price, outlined.Full screen: the whole screenshot for step 3
    Read last price
    The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.

  4. Did it drop?

    IFnode reference

    IF compares the new number with the stored one (less than). The true branch notifies, both branches go on to save it.

    Make it yours — compare with a fixed target instead, such as 50, to be told only below your price.

    Step 4, close-up of the app: The condition, outlined.Step 4, close-up of the app: The condition, outlined.Full screen: the whole screenshot for step 4
    The condition
    The settings of the Did the price drop? step (If): one condition comparing two expressions, with Add Condition.The settings of the Did the price drop? step (If): one condition comparing two expressions, with Add Condition.

  5. Show the alert

    Show Notificationnode reference

    Show Notification posts Price dropped! with the new and old price. Require Interaction keeps it on screen until you close it.

    Make it yours — send it to your phone with Telegram or Push Notification.

    Step 5, close-up of the app: Show the drop alert, outlined.Step 5, close-up of the app: Show the drop alert, outlined.Full screen: the whole screenshot for step 5
    Show the drop alert
    The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.

  6. Remember this price

    Data Storenode reference

    Data Store Set saves the new number as last-price for the next change.

    Step 6, close-up of the app: Remember this price, outlined.Step 6, close-up of the app: Remember this price, outlined.Full screen: the whole screenshot for step 6
    Remember this price
    The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.

Test it

Section titled “Test it”

  1. Install the recipe, open When the price changes, and pick the price element on your product page with the crosshair. Set URL Patterns to that site. To import the file yourself, use Add Workflow › Import, choose the .awf and click Create & open. Then click Make it mine at the bottom of the canvas, tick the box and confirm, so you can edit it.

    Step 1, close-up of the app: Create & open, outlined.Step 1, close-up of the app: Create & open, outlined.Full screen: the whole screenshot for step 1
    Create & open
    The Create a workflow dialog at step 3, Name & save, after importing price-on-page-watch.awf: Source Imported .awf, Name “Price On Page Watch”, an optional Description, Where to save “Saved locally in this browser”, and the Back and Create & open buttons.The Create a workflow dialog at step 3, Name & save, after importing price-on-page-watch.awf: Source Imported .awf, Name “Price On Page Watch”, an optional Description, Where to save “Saved locally in this browser”, and the Back and Create & open buttons.
    Step 1, close-up of the app: Make it mine, outlined.Step 1, close-up of the app: Make it mine, outlined.Full screen: the whole screenshot for step 1
    Make it mine
    The Make this workflow yours? dialog over the Price On Page Watch workflow: it came from the Marketplace, It can currently lists what the workflow may access, two notes on what changes, the “I'm responsible for what this workflow does from now on.” checkbox, and Cancel and Make it mine.The Make this workflow yours? dialog over the Price On Page Watch workflow: it came from the Marketplace, It can currently lists what the workflow may access, two notes on what changes, the “I'm responsible for what this workflow does from now on.” checkbox, and Cancel and Make it mine.
    Step 1, close-up of the app: The URL Patterns list, outlined.Step 1, close-up of the app: The URL Patterns list, outlined.Full screen: the whole screenshot for step 1
    The URL Patterns list
    The settings of the When the price changes trigger (Element Change): an empty CSS Selectors list with Add, Fire when, Match text, Debounce (ms) and URL Patterns.The settings of the When the price changes trigger (Element Change): an empty CSS Selectors list with Add, Fire when, Match text, Debounce (ms) and URL Patterns.

  2. Save and activate the workflow.

    Step 2, close-up of the app: Workflow active switch, outlined.Step 2, close-up of the app: Workflow active switch, outlined.Full screen: the whole screenshot for step 2
    Workflow active switch
    The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.The workflow editor with the Price On Page Watch recipe: sticky notes and the steps When the price changes, Read the price, Read last price, Did the price drop?, Show the drop alert, Remember this price, linked left to right. The top bar shows the Workflow active switch and Save; Test Workflow is above the canvas.

  3. Keep the product page open. Element Change only watches pages that are open in the browser.

  4. To try it without waiting for a sale, open the page’s developer tools and edit the price text to a lower number. A Price dropped! notification appears.

Variations

Section titled “Variations”
Variation What to change Level
Back in stock Set Fire when to Text matches with Match text In stock, and drop the Regex, Data Store and IF steps. Beginner
Check pages that aren’t open Use a Schedule trigger with Get HTML from Link and HTML Extract to read the price. Advanced
Log every price Add Google Sheets Append after Remember this price to chart the history. Intermediate

Troubleshoot

Section titled “Troubleshoot”
  • It never fires. The selector doesn’t match the price, or the page isn’t open. Re-pick the element with the crosshair and check URL Patterns.
  • The first change never alerts. There’s no stored price yet, so the comparison fails once. The second change works.
  • The number is wrong. The element holds more than the price (such as “Was 99, now 79”). Pick a tighter element, or adjust the Regex Pattern.
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