Search for website monitoring and you mostly find uptime checks: is the page reachable, how fast does the server answer. That is an IT question. Marketing needs the other half: not whether the page is up, but what it says and since when.
That second question is the valuable one, because a competitor's website shows what their newsletter does not. The email reveals an offer's mechanics, the homepage reveals how important it is: whatever sits in the hero slot beat every other topic in the building that week.
This guide covers which pages to watch, how to read a change, which seven tools do the work and at what cadence. All details were checked on 10 November 2026 on the vendors' own pages; free tiers move faster than prices, so check again before setup.
The hero banner is the main promotion
Laurens Mauquoi, Chief Digital Officer of nexeye, runs marketing and product management for three brands in five countries and more than 800 stores across Europe. On the Reyo podcast 360 Marketing & CRM he put it plainly: "Every retailer should know who their competitors are and what their promotions are. Not in order to copy them, you shouldn't do that." The point is understanding what the competition offers; your own strength comes from your positioning.
Website tracking he calls an important add-on, and his reasoning is the shortest version of this guide: a promotion that matters also shows up as the hero banner. Watch only the inbox and you see half the campaign. Check by hand and you pay for it: "Before this, our area managers drove around photographing posters. We don't have to do that anymore. You can almost save a person." His assessments are his own, not benchmarks.
A change on a retail website is never only a change, it is a prioritisation with a date.
| Element | What a change means | Cadence |
|---|---|---|
| Homepage hero slot | the promotion the business backs this week | daily |
| Sale or promotion page | mechanics, depth, conditions, duration | daily |
| Shipping and returns page | quiet changes to terms before a season | weekly |
| Terms of a promotion | exclusions, minimum order value, caps | every promotion |
The last row is the underrated one. Small print changes less often than a banner, and when it does, that is where the real decision sits: which brands are excluded, from what basket value the benefit applies.
Which pages to watch
The most common setup mistake is making the homepage the only address. It changes often but unspecifically, while the sale page sits still for two weeks, then changes the one line that counts.
Five addresses per competitor are enough: the sale or promotion page, where the mechanics live; the homepage, but only above the product recommendations; the shipping page, because delivery times and costs are quiet levers; the category page that matters to your range, not theirs; and the promotion terms, if the shop keeps a page.
The narrower the region, the more useful the alert. Almost every tool below lets you select an area, and those two minutes decide whether you still look in week three.
The seven tools at a glance
| Tool | Free tier | Shortest interval | Paid from |
|---|---|---|---|
| Visualping | 5 pages, 150 checks a month | 60 minutes | $14 a month |
| Distill.io | 25 monitors, 5 of them in the cloud | 6 hours in the cloud | $15 a month |
| Sken.io | 14-day trial, 140 checks | 1 minute, on every tier | €3 a month |
| ChangeTower | 3 pages, daily | daily | $12 a month |
| Wachete | 5 static and 1 dynamic page | daily | per page and interval |
| changedetection.io | unlimited, self-hosted | about 5 minutes | $8.99 hosted |
| Fluxguard | 3 sites a month | daily per page | $110 a month |
1. Visualping: the fastest route to a first alert
Visualping checks an address on a fixed interval and reports visual and text changes. Free covers 5 pages and 150 checks a month on one seat, no card required, 60 minutes as the shortest interval, plus email, webhook and REST API access. Five pages checked daily consume 150 to 155 checks depending on month length. Failed checks count too, and once the allowance is gone, monitoring pauses until the month resets. Paid starts at $14 a month for 10 pages.
2. Distill.io: fast locally, slow in the cloud
Distill.io separates two modes, and that is the whole trick. Local monitors run in your browser or desktop app and allow intervals from five seconds, but need a device that stays on with the app open. Cloud monitors keep checking when your machine is off. Free covers 25 monitors, 5 in the cloud, 1,000 cloud checks a month, a six-hour minimum cloud interval and 30 email alerts. Paid starts at $15 a month with 50 monitors.
3. Sken.io: speed without a tier upgrade
Sken.io has no permanent free tier, just a 14-day trial with 140 checks and every feature unlocked. After that the base tier is €3 a month for 500 checks, the middle one €12 for 3,000, the largest €45 for 15,000. The unusual part: the one-minute interval is available on every tier, including the €3 one. The limit is the check budget, not the speed: a monitor running every minute burns 1,440 checks a day.
4. ChangeTower: a free tier with memory
ChangeTower checks 3 pages once a day for free, no card and no expiry, with content change detection, keyword tracking and email alerts. Snapshot history goes back 30 days, which in this class is the exception. Paid starts at $12 a month for 25 pages daily, $36 for 100 pages hourly and $78 for 200 pages. You build the page list yourself: scanning a whole domain is reserved for the largest tier.
5. Wachete: billed per page, not per check
Wachete prices differently from the rest of this list, and for competitor work that helps. There is no monthly check budget: you pay for the number of pages and for the interval, and within that the checks run around the clock. Free covers 5 static pages and one dynamic page, checked daily; paid tiers go down to a few minutes. Dynamic means content assembled in the browser, which is how modern promotion pages are built.
6. changedetection.io: the route for teams with a server
changedetection.io is open source and free to self-host, with as many watched pages as your machine can carry. If you would rather not run a server, the hosted version costs $8.99 a month with 5,000 watched pages, recheck intervals from about five minutes and a real browser for pages built by scripts. Change summaries from a language model run on your own key with the provider, so you pay those costs directly.
7. Fluxguard: whole sites instead of single pages
Fluxguard thinks in sites rather than addresses. Free covers 3 sites a month with three stored versions per page. Above that sit $110 a month for 25 sites, $220 for 50 and $550 for 100. Billing runs on credits, with the vendor assuming roughly ten pages per site crawled daily. It earns its place when you do not yet know which address you need, because it follows newly appearing links. Versionista now belongs to Fluxguard.
The Wayback Machine as retroactive memory
No tool on the list knows the time before you set it up. The Internet Archive's Wayback Machine does: it puts two archived versions of a page side by side and highlights the differences. Save your main competitors' promotion pages weekly and you will have December in January. More free routes sit in the guide to free competitor analysis tools.
Cadence and allowance: the maths before setup
Nearly every disappointment with these tools comes from one calculation: monthly checks are pages times checks per day times thirty. Five pages checked hourly is 3,600 checks, outside every free tier. Five pages checked daily is 150 and fits exactly inside one.
| Your question | Cadence | Pages per competitor |
|---|---|---|
| Is a promotion running now? | daily, early morning | 2 |
| How deep is the market this week? | daily | 2 to 3 |
| Are shipping terms changing? | weekly | 1 |
| Is the season starting earlier? | daily in the occasion window | 2 |
An early morning check catches most changes, because new promotions mostly go live overnight. Hourly only pays off inside an occasion window, such as the week before Black Friday. Those dates sit in the Q4 guide 2026, and seasonal campaign planning lays the windows across the year.
Common mistakes
- Watching the homepage only. It reports every new image and hides the conditions.
- Watching the whole page body. Recommendation blocks and stock notices produce empty alerts.
- Picking the shortest interval because it exists. The allowance is gone in two days.
- Mistaking the alert for the interpretation. That the banner changed is not an insight. That it says 30 percent above a 60 euro basket for ten days is one.
What is fine and what is not
Unproblematic: requesting and comparing publicly reachable pages at a normal cadence, using archives, subscribing to newsletters with your own identified address.
Not acceptable: requesting areas behind someone else's login, bypassing protection, ignoring technical restrictions, or hitting a page so often it burdens the site. A daily check on five pages shows up in no server log; one every minute on fifty does.
Two limits apply to our own analyses as well, and to every tool on this list: we do not name the shops we track, because the point is the pattern and not the sender. And we see what was sent, not how it performed. Opens, clicks and revenue appear in none of these tools, paid ones included.
How Reyo helps
The seven tools above report change. What they lack is interpretation: whether this discount is deeper than March's, and whether half the market runs the same thing.
- Competitor monitoring follows newsletters and website promotions such as banners and landing pages, putting every campaign on one timeline with occasion, discount, code, minimum order value and duration.
- Analytics turns that into the series across months, by competitor and by market, so the comparison with last year has a number.
- Marketing recommendations condense it into steps for the week, and the campaign planner holds what your team decides.
Basic starts at 69 € a month billed annually (83 € monthly) for three competitors, with a 14-day trial, excluding VAT. The rhythm around it sits in the guide to competitor monitoring, the price side in competitor price monitoring, the advertising side in social and ads monitoring. Paid tools by channel are compared in the overview of competitor tracking tools, and why the website matters for stores is covered in omnichannel retail.
Takeaways
Competitor website monitoring is a selection problem, not a technical project: five addresses per competitor, a daily morning check, a narrowed page region. That is enough to see the market's main promotion on the day it starts rather than the week after.
The tools cost little and some cost nothing. The expensive part is where they stop: an alert says something changed, not what it means. Need the comparison over time and you are paying for memory and interpretation, not for data.
Want to see which promotions your competitors are running this week across email and website? Start your 14-day free trial, from €69 a month, or book a demo.
Published on 10 November 2026, all details checked the same day on the vendors' own pages.