Buyer's guide · checked October 16, 2026

Best Website Monitoring Tools in 2026, Compared

Nine website monitoring tools ranked by how many of nine common website problems their cheapest paid plan checks, then by price. Every rival price links to the vendor page it came from.

See the decision table How we ranked

Visual Sentinel publishes this guide and sells one of the tools. On the criterion below it ranks number 2.

The short answer

Oh Dear ranks first: its cheapest plan checks 7 of the 9 problems, including broken links and scheduled jobs. Visual Sentinel is second with 6, and is the only uptime tool in this list whose plans compare scheduled screenshots with a saved version, which catches a page that loads but looks broken. UptimeRobot, Site24x7 and Better Stack check 5 each; choose between them by price, check speed and on-call needs.

Method

How we ranked the tools

We counted how many of these 9 checks each tool's cheapest paid plan includes (for free software, the software itself), using the vendor's own pricing and product pages on October 16, 2026. More checks rank higher. A tie goes to the lower monthly price when both prices are in the same currency. This measures coverage, not how quickly or accurately a tool spots a problem.

Site downThe site stops answering visitors.
Security certificateThe padlock certificate breaks or is about to expire.
Domain expiryThe domain name registration is about to run out.
DNS recordsThe records that point your domain at your site or mail change or fail.
Page speedA full page-load or Lighthouse test, not only how fast the server replies.
Looks brokenA scheduled screenshot is compared with a saved version, so a page that loads but looks wrong is caught.
Wording changedThe text on a page is compared with an earlier version. A check for one fixed word does not count.
Broken linksThe site is crawled for links to missing pages.
Scheduled jobsA backup or import job that stops checking in raises an alert.

We left out server resources and application health checks, because both need software on your own server or in your code, which most business sites on managed hosting do not have. Visual Sentinel and HetrixTools include a server agent, and Oh Dear reads application health results; the tool notes below say so.

Decision table

The 9 tools at a glance

Prices are the cheapest paid plan as each vendor published it on October 16, 2026, before tax. Oh Dear publishes prices in euros; the others in US dollars.

Website monitoring tools ranked by checks in the cheapest paid plan, with prices, free options and sources checked October 16, 2026
Tool	Best for	Checks in cheapest plan	Starting paid price	Free option	Source
1Oh Dear	Agencies and developers who want broken-link, certificate, DNS, domain and scheduled-job checks on every plan, priced by the number of sites.	7 of 9	Solo: €15 a month for 2 sites and servers, or €150 a year (euros, before VAT)	No free plan. 10-day free trial with no card.	Oh Dear pricing, checked October 16, 2026 (opens in a new tab)
2Visual SentinelOur product	Small businesses and agencies that need to know when a page still loads but looks broken, alongside uptime, certificate, domain, DNS and speed checks.	6 of 9	Solo: $15 a month, or $153 a year	No free plan for new workspaces. Your site's first check is free, then a 7-day trial (card required).	Visual Sentinel pricing, checked October 16, 2026
3Site24x7	IT teams that want website checks inside a wider monitoring suite for servers, networks, applications and real visitors.	5 of 9	Web Uptime: $10 a month, or $9 a month paid annually	Free plan with no time limit. Site24x7 gives its size as up to 50 monitors on one page and 5 on another.	Site24x7 pricing, checked October 16, 2026 (opens in a new tab)
4UptimeRobot	Many simple website checks for a low price, with a large free plan.	5 of 9	Solo: $13 a month, or $12 a month billed annually (US price; UptimeRobot prices vary by region)	Free plan: 50 monitors checked every 5 minutes. Certificate, domain, DNS and cron job checks are on paid plans only.	UptimeRobot pricing, checked October 16, 2026 (opens in a new tab)
5Better Stack	Teams that need on-call schedules, phone and SMS alerts and incident management alongside uptime checks.	5 of 9	Responder: $34 per license a month, or $29 billed annually; 50 more monitors cost $25 a month	Free for personal projects: 10 monitors and heartbeats, 1 status page, Slack and email alerts.	Better Stack pricing, checked October 16, 2026 (opens in a new tab)
6Uptime Kuma	Technical users who will run their own monitoring server and want unlimited checks with no license fee.	4 of 9	No paid plan: free, open-source software (MIT license) that you host yourself	Free. You provide, update and back up the server it runs on.	Uptime Kuma on GitHub, checked October 16, 2026 (opens in a new tab)
7HetrixTools	Budget uptime and server monitoring, plus blacklist checks for mail server addresses.	4 of 9	Professional: $9.95 a month, or $99.95 a year	Free plan: 15 uptime monitors and 15 server monitors.	HetrixTools pricing, checked October 16, 2026 (opens in a new tab)
8Visualping	Watching pages for visual, text or element changes, such as prices, policies or competitors. It is not an uptime monitor.	2 of 9	Personal 1K: $14 a month, or $120 a year	Free plan: 5 pages and 150 checks a month, as often as every 60 minutes.	Visualping pricing, checked October 16, 2026 (opens in a new tab)
9Pingdom	Teams that need scripted journeys such as a login or checkout, and speed data from real visitors, from SolarWinds.	2 of 9	Synthetic Monitoring: from $16.50 a month billed annually ($198 a year)	No free plan. Free trial that includes Synthetic and Real User Monitoring.	Pingdom pricing, checked October 16, 2026 (opens in a new tab)

Check by check

What each cheapest plan checks

"Yes" means the cheapest paid plan includes it. "Higher plan" means a higher plan or paid add-on. "Not listed" means the vendor's pricing and product pages did not list it on October 16, 2026; it may exist elsewhere.

Which of the 9 website checks each tool's cheapest paid plan includes
Tool	Site down	Security certificate	Domain expiry	DNS records	Page speed	Looks broken	Wording changed	Broken links	Scheduled jobs	Total
Oh Dear	Yes	Yes	Yes	Yes	YesPerformance and Lighthouse	Not listedAI browser checks can attach a screenshot	Not listedRequired or forbidden text	YesDaily crawl	Yes	7
Visual Sentinel	YesEvery 5 min	Yes	YesExpiry reminders	YesRecord history	YesMobile Lighthouse test	Yes1 site, every 30 min	Higher planFrom Starter	No	No	6
Site24x7	YesEvery minute	Yes	Yes	Yes	Higher planAdvanced monitor	Not listedDefacement compares page code, not screenshots	Higher planDefacement monitor	Not listed	YesCron and heartbeat monitors	5
UptimeRobot	YesEvery 60 seconds	Yes	Yes	Yes	Not listedSlow-response alerts only	Separate toolFree change-detection tool	Separate toolFree change-detection tool	Not listed	YesHeartbeat monitors	5
Better Stack	YesUp to every 30 seconds	Yes	YesTLD expiry	YesDNS server checks	Not listedResponse times only	Not listedScreenshots of errors	Not listedKeyword checks	Not listed	YesHeartbeats	5
Uptime Kuma	YesEvery 20 seconds or more	YesCertificate info	Not listed	YesDNS record monitors	Not listed	Not listed	Not listedKeyword checks	Not listed	YesPush monitors	4
HetrixTools	YesEvery minute	Yes	Yes	YesNameserver changes	Not listed	Not listed	Not listed	Not listed	Not listed	4
Visualping	Not listed	Not listed	Not listed	Not listed	Not listed	YesVisual change detection	YesText change detection	Not listed	Not listed	2
Pingdom	Yes	Not listed	Not listed	Not listed	YesPage speed monitoring	Not listed	Not listed	Not listed	Not listed	2

On a phone, swipe the table sideways to see all nine checks.

The ranking

Each tool, and when it is the better pick

Including where a rival is a better choice than Visual Sentinel.

1
Oh Dear
7 of 9 checks
Agencies and developers who want broken-link, certificate, DNS, domain and scheduled-job checks on every plan, priced by the number of sites.
What it checks
Every plan includes uptime, broken links and mixed content, performance and Lighthouse, sitemap checks, certificate health, DNS records, DNS blocklists, domain expiry, scheduled tasks, application health, server reachability and port checks, status pages and monthly reports.
Starting paid price
Solo: €15 a month for 2 sites and servers, or €150 a year (euros, before VAT)
Free option
No free plan. 10-day free trial with no card.
Pick it when
Pick Oh Dear over Visual Sentinel when you need broken-link and mixed-content crawling, scheduled-job check-ins, application health checks, SMS alerts or unlimited users on the smallest plan. It does not list scheduled screenshot comparison or WhatsApp alerts.
Oh Dear pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs Oh Dear
2
Visual Sentinel
Our product6 of 9 checks
Small businesses and agencies that need to know when a page still loads but looks broken, alongside uptime, certificate, domain, DNS and speed checks.
What it checks
Solo checks up to 10 monitors every 5 min, compares screenshots of 1 site every 30 min, warns before certificates and domains expire, keeps DNS record history and runs a mobile Lighthouse test. It includes 1 server agent for CPU, memory and disk. Wording checks start on Starter.
Starting paid price
Solo: $15 a month, or $153 a year
Free option
No free plan for new workspaces. Your site's first check is free, then a 7-day trial (card required).
Trade-off
Pick Visual Sentinel when the failure you fear is a page that still loads but looks wrong to visitors, or when you want WhatsApp alerts and white-label client reports (Agency plan). It does not crawl for broken links, watch scheduled jobs or send SMS alerts.
Visual Sentinel pricing, checked October 16, 2026 Compare Visual Sentinel plans
3
Site24x7
5 of 9 checks
IT teams that want website checks inside a wider monitoring suite for servers, networks, applications and real visitors.
What it checks
Web Uptime covers 25 websites checked every minute from 32 locations, with 3 status pages. Certificate or domain expiry, DNS and cron checks are basic monitor types. Page speed and website defacement (content change) checks are advanced monitors that Web Uptime does not include.
Starting paid price
Web Uptime: $10 a month, or $9 a month paid annually
Free option
Free plan with no time limit. Site24x7 gives its size as up to 50 monitors on one page and 5 on another.
Pick it when
Pick Site24x7 when one vendor should also watch servers, networks, applications and real visitors, or check intervals as low as 10 seconds, which its website monitoring page lists.
Site24x7 pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs Site24x7
4
UptimeRobot
5 of 9 checks
Many simple website checks for a low price, with a large free plan.
What it checks
Solo covers 10 monitors checked every 60 seconds, with keyword, certificate, domain expiry, DNS record and cron job (heartbeat) checks, slow-response alerts and 3 status pages. A separate free change-detection tool emails a visual snapshot when a chosen part of a page changes.
Starting paid price
Solo: $13 a month, or $12 a month billed annually (US price; UptimeRobot prices vary by region)
Free option
Free plan: 50 monitors checked every 5 minutes. Certificate, domain, DNS and cron job checks are on paid plans only.
Pick it when
Pick UptimeRobot when you need many monitors cheaply, faster checks (30 seconds on Team, 15 on Scale), SMS or voice-call alerts, or port checks. Its uptime plans do not compare screenshots.
UptimeRobot pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs UptimeRobot
5
Better Stack
5 of 9 checks
Teams that need on-call schedules, phone and SMS alerts and incident management alongside uptime checks.
What it checks
Responder includes 10 monitors checked as often as every 30 seconds, with keyword, certificate, domain (TLD) expiry and DNS server checks, cron job heartbeats, screenshots of errors and 1 status page. Scripted browser checks cost extra.
Starting paid price
Responder: $34 per license a month, or $29 billed annually; 50 more monitors cost $25 a month
Free option
Free for personal projects: 10 monitors and heartbeats, 1 status page, Slack and email alerts.
Pick it when
Pick Better Stack for on-call rotations, unlimited phone and SMS alerts, scripted browser journeys and logs in one place. It does not list scheduled screenshot comparison.
Better Stack pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs Better Stack
6
Uptime Kuma
4 of 9 checks
Technical users who will run their own monitoring server and want unlimited checks with no license fee.
What it checks
Website, keyword, JSON, DNS record, push and Docker container monitors, as often as every 20 seconds, with certificate info, multiple status pages and alerts through Telegram, Discord, Slack, email and 90+ notification services.
Starting paid price
No paid plan: free, open-source software (MIT license) that you host yourself
Free option
Free. You provide, update and back up the server it runs on.
Pick it when
Pick Uptime Kuma when you want full control and no subscription, and you are comfortable keeping its server running. Checks run only from the place you host it.
Uptime Kuma on GitHub, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs Uptime Kuma
7
HetrixTools
4 of 9 checks
Budget uptime and server monitoring, plus blacklist checks for mail server addresses.
What it checks
Professional covers 30 uptime monitors and 30 server monitors, checked every minute on every plan, with certificate and domain expiry, nameserver changes, status pages and a server agent for CPU, memory, disks and network.
Starting paid price
Professional: $9.95 a month, or $99.95 a year
Free option
Free plan: 15 uptime monitors and 15 server monitors.
Pick it when
Pick HetrixTools for server monitoring on a small budget, phone and SMS alerts, or blacklist monitoring of mail server addresses. It does not list page speed tests or screenshot comparison.
HetrixTools pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs HetrixTools
8
Visualping
2 of 9 checks
Watching pages for visual, text or element changes, such as prices, policies or competitors. It is not an uptime monitor.
What it checks
Personal 1K covers 10 pages and 1,000 checks a month, as often as every 15 minutes, with visual, text and element change detection and AI change summaries.
Starting paid price
Personal 1K: $14 a month, or $120 a year
Free option
Free plan: 5 pages and 150 checks a month, as often as every 60 minutes.
Pick it when
Pick Visualping when you track changes on pages you do not own, need element-level tracking or AI change summaries, and do not need uptime, certificate or DNS checks.
Visualping pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs Visualping
9
Pingdom
2 of 9 checks
Teams that need scripted journeys such as a login or checkout, and speed data from real visitors, from SolarWinds.
What it checks
Synthetic Monitoring at its entry quantity covers 10 uptime checks and 1 advanced (transaction) check, page speed monitoring, 50 SMS alerts, public status pages and reports. Real User Monitoring is a separate product at the same starting price.
Starting paid price
Synthetic Monitoring: from $16.50 a month billed annually ($198 a year)
Free option
No free plan. Free trial that includes Synthetic and Real User Monitoring.
Pick it when
Pick Pingdom when you need to script multi-step journeys like a checkout, measure how fast pages load for real visitors, or get SMS alerts. Its pricing and product pages did not list certificate, domain, DNS or screenshot checks.
Pingdom pricing, checked October 16, 2026 (opens in a new tab)Visual Sentinel vs Pingdom

Evidence

Incidents we caught

Two real incidents from sites we run, caught by Visual Sentinel. Text, logos and faces are removed.

A homepage lost its layout for about four hours

July 2026. A homepage lost its layout for about four hours: the full-width banner shrank and the page text stacked down the left side. All 1,250 uptime checks that day passed. Text and logos removed.

Homepage with a full-width red banner filling the screen under a one-line menu. Text and logos removed. — Normal

The same homepage with its banner shrunk to a small box and its text stacked down the left in plain type, as if its stylesheet had not loaded. The broken area is outlined. — Broken

A header lost its layout for 35 minutes

September 2026. A homepage header lost its layout for 35 minutes: the menu stacked and the booking buttons stretched across the page. No downtime was recorded in that window. Text, logos and faces removed.

Normal

The same homepage with the menu stacked in the middle, oversized social icons and the two booking buttons stretched across the full width. The broken header is outlined. — Broken

Where Visual Sentinel fits

A page that loads but looks wrongScheduled screenshots are compared with a saved version on every paid plan.
Changed wording or pricesPage text history for the parts you choose, from Starter.
The server behind the siteA server agent puts CPU, memory and disk beside website incidents.
Alerts where people already areWhatsApp, Slack, Teams, Telegram and email on every paid plan.
Client reportsScheduled reports from Business, white-label on Agency.

Where another tool fits better

Broken links and scheduled jobsOh Dear checks both on every plan.
Many cheap checksUptimeRobot and HetrixTools cost less per monitor.
On-call and phone alertsBetter Stack includes on-call schedules and unlimited phone and SMS alerts.
Checkout journeys and real visitorsPingdom scripts transactions and measures real visitors.
No subscriptionUptime Kuma is free if you run the server yourself.

Keep reading

Frequently asked questions

What is the best website monitoring tool?

It depends on what can go wrong with your site. On our stated criterion (how many of 9 common website checks the cheapest paid plan includes, then price), Oh Dear ranks first with 7 and Visual Sentinel second with 6. UptimeRobot is a strong low-cost choice for many simple checks, Better Stack suits teams that need on-call schedules, and Pingdom suits teams that script checkout journeys. Visual Sentinel publishes this guide and sells one of the tools.

How did you rank these tools?

We listed 9 common ways a business website goes wrong: the site going down, the security certificate, domain expiry, DNS records, page speed, a page that loads but looks broken, changed wording, broken links and scheduled jobs that stop. For each tool we counted how many its cheapest paid plan includes, using the vendor's own pricing and product pages on October 16, 2026. More checks rank higher. A tie goes to the lower monthly price when both are in the same currency. It is a coverage ranking, not a test of how quickly or accurately each tool detects problems.

Which website monitoring tools have a free plan?

When we checked on October 16, 2026: UptimeRobot Free covers 50 monitors every 5 minutes. HetrixTools Free covers 15 uptime and 15 server monitors. Better Stack is free for personal projects with 10 monitors and heartbeats. Site24x7 has a free plan with no time limit. Visualping Free covers 5 pages and 150 checks a month. Uptime Kuma is free software you host yourself. Oh Dear and Pingdom offer free trials instead. Visual Sentinel has no free plan for new workspaces: your site's first check is free, then a 7-day trial (card required) or a subscription.

How much does website monitoring cost?

Entry paid plans we checked on October 16, 2026 start at $9.95 a month (HetrixTools Professional), $10 (Site24x7 Web Uptime), $13 (UptimeRobot Solo, US price), $14 (Visualping Personal 1K), €15 before VAT (Oh Dear Solo), $16.50 billed annually (Pingdom Synthetic) and $34 per license (Better Stack Responder). Visual Sentinel plans are $15, $30, $80 and $300 a month, 15% less billed annually. Compare what each price covers, not only the number.

Which tools catch a page that loads but looks broken?

A check that only asks whether the site answers stays green when a layout breaks, an image disappears or a button is hidden. Visual Sentinel compares scheduled screenshots with a saved version on every paid plan (1 site on Solo, 5 on Starter). Visualping detects visual changes on pages you choose. UptimeRobot offers a separate free change-detection tool that emails a snapshot of a chosen page area. The other tools here did not list scheduled screenshot comparison.

What does Visual Sentinel not do?

It does not crawl your site for broken links, watch scheduled jobs, read application health results, send SMS or voice alerts, script multi-step journeys such as a checkout, or measure speed for real visitors. Oh Dear, Better Stack, UptimeRobot, Site24x7 and Pingdom cover some of those, as the comparison table shows.

Is this ranking independent?

No. Visual Sentinel publishes this page and sells one of the tools, so read it as a sourced comparison, not neutral research. Every rival price links to the vendor page it came from, with the date we checked it. Prices change and some vary by region, so confirm the live price before you buy.

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