To detect visual changes with Apify, use a screenshot Actor that saves a baseline and compares later captures, then schedule that Actor or a saved task in Apify. Scheduling launches runs; the selected Actor determines how screenshots, comparison, and baseline storage work. The first successful run is usually setup for comparison, not evidence that the page stayed unchanged.
How Apify scheduled screenshot monitoring works
Apify schedules start Actors or tasks at chosen times. They do not, by themselves, take screenshots or compare pages. Those behaviors come from the Actor you select. Apify describes schedules as a way to run Actors and tasks at specific times in its Actor and task schedules documentation.
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A basic monitoring loop has three parts: capture a reference, capture the same page later using consistent settings, and inspect the Actor’s comparison output. The referenced screenshot-monitoring Actors are community-maintained Store listings, so treat their options and behavior as Actor-specific and confirm them in the current listing before relying on them.
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Apify Store listings describe different approaches to website screenshots and visual monitoring. One listing describes full-page screenshots, optional element capture, device choices, visual comparison, change reporting, and a diff image; others describe saving a visual baseline or stored content snapshots with optional screenshots. These are not universal Apify platform features.
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| What to check | Why it matters |
|---|---|
| Capture scope | Confirm whether the Actor captures a viewport, a full page, or an element selected with a CSS selector. Narrowing the capture can reduce irrelevant changes, but only use it if the Actor supports it and you have verified the selector on the live page. |
| Comparison and outputs | Check whether it reports a threshold or percentage, returns a diff image, or provides only captured screenshots. Read the current Actor output schema to find the exact fields and stored keys. |
| Baseline persistence | Find out where the reference capture is stored and whether it remains available across scheduled runs. Individual listings describe different mechanisms, including named key-value storage or stored screenshot references. |
| Noise controls | Look for an adjustable threshold or a way to ignore regions if changing timestamps, ads, or other dynamic elements generate unwanted alerts. Do not assume an Actor offers these controls. |
| Maintenance and usage costs | Check the current Store listing for maintenance status, recent updates, pricing, and usage limits. Community-maintained listings and their commercial terms can change. |
Before adopting an Actor for an important page, run it against that page and verify the screenshot, baseline behavior, output fields, and handling of dynamic content.
Establish a baseline before scheduling
- Configure one target. Enter the page URL and choose the capture scope and device or viewport options supported by the Actor.
- Run the Actor manually. Inspect the result and confirm that the page rendered as expected. The initial successful run commonly stores the reference used for later comparisons.
- Check baseline storage. Confirm the selected Actor’s documented storage mechanism and that the stored reference survives between runs. Do not assume that one Actor’s named key-value store or screenshot-reference approach applies to another.
- Run it again and inspect the comparison. A second run is where you can check whether the Actor recognizes the baseline and produces the expected comparison result.
Keep the capture settings stable from run to run: viewport or device, full-page versus element capture, selector, and other page-state options. This is practical advice rather than a platform guarantee; changing the capture conditions can introduce differences unrelated to the content you intend to monitor.
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Create a recurring schedule in Apify
Apify schedules use cron expressions and support a timezone. The Console includes a visual setup tool, and the official guide says an Actor should have been run at least once before it is scheduled. You can schedule an Actor or a saved task. For programmatic setup, Apify documents schedule configuration and actions in its Create schedule API reference.
- Open Apify Console and go to Schedules. Start a new schedule and select the Actor or saved task that performs the screenshot comparison.
- Set the recurrence. Use the visual configuration or a cron expression for the cadence you need, and select the timezone explicitly.
- Review the action and input. Make sure the scheduled action runs the intended Actor or task with the same target URL and capture settings used to establish the baseline.
- Save and verify the first scheduled run. Check that it starts and completes, then inspect the Actor output rather than treating the presence of a schedule as proof that monitoring is working.
Choose a cadence based on how quickly you need to know about changes and the Actor’s resource use or cost. Hourly and daily cadences appear as examples in individual Store descriptions, not as recommendations for every site or guarantee of alert timing. Apify says scheduled events are fired within one second of their scheduled time in most cases, while warning that system overload or a server shutting down can delay runs; this is not a precise-latency guarantee.
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Read screenshot differences and run health separately
Depending on the selected Actor, outputs may include the current screenshot, a comparison result, a percentage-of-page change, a diff image, a baseline indicator, or stored screenshot keys. Consult that Actor’s current output schema instead of assuming a standard format across Apify.
Apify’s run monitoring is separate from page-change detection. Its monitoring documentation describes run-status and metric charts and alerts for Actor or task performance. Check the run status before interpreting an absent or stale diff: a failed run cannot show that the page was unchanged. The documentation available for monitoring is a preview page, so confirm the current production documentation for the latest labels and behavior.
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Troubleshooting scheduled screenshot monitoring
- No comparison on the first run: This is often expected because the first successful run establishes the baseline. Check the Actor’s description and output to confirm its specific behavior.
- Every run looks different: Compare capture settings between runs. A changed viewport, device, selected element, or page state can cause visual differences. If supported, try a narrower verified selector or the Actor’s noise controls.
- The baseline disappears: Check where the Actor stores it and whether that storage is configured to persist across runs. Baseline persistence is Actor-specific.
- A scheduled run is missing or late: Inspect schedule configuration, timezone, action, and run history. Apify notes that schedules may be delayed under some system conditions, so do not rely on the scheduled time as an exact alert deadline.
- There is no new screenshot or diff: Check the run status and logs first, then confirm the current output schema and storage location for the selected Actor.
- The screenshot is not representative: Run the Actor manually and verify what it captures, including whether the full page or only the viewport is included and whether the chosen selector still matches.
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Check access and applicable rules
Before monitoring a site, assess whether you are permitted to automate access and store its screenshots under the site’s terms and the rules that apply in your jurisdiction. The cited Apify documentation and Store listings do not establish a universal legal permission for every target site.
Quick Recap
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