To detect website changes with Apify, use an Actor or saved task that captures a page and compares each new capture with a stored baseline, then schedule that Actor or task to run regularly. Apify provides the schedule; the selected Actor determines how screenshots, baselines, and visual differences work. Those details are not universal Apify features.
How Apify scheduling and screenshot comparison fit together
Apify schedules launch Actors or tasks at chosen times. A screenshot-monitoring Actor does the page capture and comparison. A schedule alone does not take screenshots or decide whether a page changed.
That distinction matters when diagnosing results: a schedule may launch successfully while an Actor fails, and an Actor may run successfully without detecting a meaningful content change. Treat schedule configuration, Actor execution, and page-difference results as separate parts of the workflow.
Choose an Actor that matches the page you want to monitor
Apify Store listings include community-maintained options such as Website Screenshot API & Visual Change Monitor, Website Visual Monitor, and Website Change Monitor & Alert System. Listings describe capabilities such as full-page or element screenshots, visual comparisons, diff images, and stored page snapshots, but capabilities and implementation differ by Actor. These listing titles are useful search terms in the Apify Store; confirm the current listing, documentation, output schema, price, and maintenance state before relying on one.
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Compare candidate Actors on the details that affect your use case:
- Capture scope: Full page, viewport, or a CSS-selected element. A selected element can reduce irrelevant page noise if the Actor supports it and the selector is verified on the live page.
- Difference output: Check whether the Actor provides screenshots, a change percentage, a threshold, or a highlighted diff image. Do not assume every Actor uses the same comparison method.
- Baseline persistence: Find out where the reference image or page snapshot is stored and whether it remains available to later scheduled runs. Store listings describe different approaches, including named key-value storage and saved screenshot references.
- Noise controls: Look for supported thresholds or ignored regions if ads, rotating content, or other dynamic areas create unwanted alerts.
- Ongoing fit: Check the listing’s current update and maintenance information, usage limits, and pricing. Community Actor details can change.
Establish a baseline before interpreting changes
- Configure the Actor. Add the target URL and choose the capture scope and other supported settings. Keep the viewport, device, page state, and scope consistent between runs; otherwise, a difference may reflect changed capture conditions rather than a site update.
- Run it once manually. The first successful run commonly stores a baseline. Verify the Actor’s instructions and output to confirm that it did so and identify where the baseline persists.
- Check the result. A first capture is setup, not evidence that the page was unchanged. Learn which output fields indicate a baseline, a new screenshot, a diff, or a detected change.
- Run it again under the same settings. Confirm that the Actor can retrieve the saved baseline and produce a comparison before relying on a schedule.
Create a recurring schedule in Apify
Apify’s Actor and task schedules guide explains how to start Actors or tasks at selected times using cron expressions. Schedule configuration supports a timezone, and the Console provides a visual setup tool. The guide says the Actor should have been run at least once before you schedule it.
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- Open the Apify Console’s schedule configuration and choose an Actor or saved task that has already been run.
- Set the recurring time using the visual setup tool or a cron expression, and select the timezone you intend the schedule to follow.
- Save the schedule, then inspect its next run and execution history to verify that it launches the expected Actor or task.
- Set a cadence that fits how quickly you need to know about changes and the Actor’s resource use. Daily or hourly cadences appear as examples in individual Actor descriptions, not as universal recommendations.
Apify’s scheduling guide says that, in most cases, scheduled events fire within one second of their scheduled time, but it also notes that system overload or a server shutting down can delay runs. This is not a promise of precise alert delivery. For API-based setup, consult Apify’s Create schedule API documentation for the supported schedule configuration and actions.
Inspect screenshots, diffs, and run health separately
Read the selected Actor’s current output schema to locate its screenshot, diff, baseline indicator, or change result. One Actor listing describes a current screenshot, a percentage-of-page change measure, and a diff image; another describes screenshot and diff outputs plus a baseline flag. These are listing-specific examples, not a shared Apify output format.
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Apify’s monitoring documentation describes run-status and metric charts and alerts for Actor or task performance. Use those execution signals alongside the Actor’s page-comparison output. A failed run cannot establish that the page was unchanged; missing or stale comparison results require checking the run status and logs.
Common problems and fixes
- No change result on the first run: The initial successful capture may only establish the baseline. Run the Actor again to test comparison behavior.
- Every run reports a change: Check that viewport, device, capture scope, and page state are stable. If the Actor supports it, use a threshold or exclude a noisy region.
- The baseline seems to disappear: Check the Actor’s documentation for its storage mechanism and whether that storage persists between runs. Do not assume one Actor’s storage setup applies to another.
- A scheduled run produces no fresh screenshot: Inspect the schedule history and Actor run status. A schedule launch or Actor failure is different from a page that was successfully checked and found unchanged.
- A selector capture is empty or wrong: Confirm that the selector exists on the live page and that the selected Actor supports element capture. Re-test manually after page layout changes.
- Alerts arrive later than expected: Scheduled runs may be delayed under system conditions. Choose a cadence appropriate to your needs, but do not treat the scheduled time as a guaranteed alert deadline.
Cost, reliability, and site-specific considerations
Actor pricing and usage limits depend on the selected Store listing and can change, so check the current terms and track actual use before increasing the schedule frequency. More frequent runs can consume more of an Actor’s resources. A cloud schedule removes the need to keep a personal computer running, but the workflow still depends on the chosen Actor, its persistence strategy, and successful page access.
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Before monitoring a site, assess its access permissions and any applicable privacy, contract, or regional rules. These depend on the target and your circumstances; this workflow does not provide a blanket legal assurance.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpReplace the example URL with the page you want to capture. This call captures a screenshot; it does not by itself schedule recurring runs or compare against a persistent baseline.
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Frequently Asked Questions
Can Apify compare screenshots from one run to the next?
Yes, when the selected screenshot Actor supports comparison and retains a baseline between runs. The details depend on that Actor.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallDoes an Apify schedule guarantee that a change alert arrives at the scheduled minute?
No. Apify says scheduled events usually fire close to their scheduled time, but delays can occur under some system conditions.
Do I need a physical device to run scheduled website screenshots?
No. The workflow described here uses Apify’s cloud Actors, schedules, and storage.
Quick Recap
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