Per-page monitoring
at a fraction of the cost of Oh Dear
Oh Dear bills 1 URL per "site." Matching 15-page coverage means buying 15 sites. SiteLetter is the agency-shaped alternative: $5/site flat for 15 pages, plus a branded monthly client report Oh Dear does not ship.
Also evaluating UptimeRobot or StatusCake? See those comparisons, or browse all alternatives.
Quick verdict
Both tools are good. The decision comes down to who you are and what you need to deliver.
Tech teams, DevOps, and single-site owners
Developers and DevOps teams who run their own infrastructure (cron jobs, app health, DNS records, ping, TCP, multi-region probes), or anyone with one or two sites where homepage uptime + SSL is enough.
At this shape Oh Dear is genuinely cheaper at every volume (€15/mo for 5 sites vs $25/mo on SiteLetter). Their broken-link crawler also reaches deeper (up to 5,000 pages from one URL), which is a real win if that is what you need.
Agencies monitoring client sites
Your monthly client deliverable depends on more than the homepage being up. It covers Lighthouse, visual regression, and uptime across the pages a client's customers actually land on: the cart, the contact form, the pricing page, the top blog posts. When those break, alerts fire on real breakage - the AI classifier filters out cosmetic noise like rotating banners and ad swaps.
SiteLetter is the only tool priced for that. $5/site covers every monitored page with full per-page coverage. Matching that on Oh Dear means buying 15 separate URL monitors per site, which is roughly 3-5x at typical agency portfolio sizes.
Both tools are good. They were built for different audiences, and that audience choice shapes every decision underneath.
"The all-in-one monitoring tool for your entire website. Trusted by tech teams, developers, and marketers worldwide."
"Website monitoring for agencies, delivered by email."
What does one paid "site" actually monitor?
Both tools bill per "site" but define "site" differently. This is the apples-to-apples breakdown of everything one billable site covers in each tool, top to bottom.
| Feature | SiteLetter | Oh Dear |
|---|---|---|
| Price | ||
| Pricing unit | 1 site with up to 15 pages (URLs) | 1 URL = 1 monitor |
| Cost per site | $5/site flat (all volumes) | €1.10 - €3.00/site (depends on tier) |
| Cost per monitored page / URL | $0.33/page (when site is fully used) | €1.10 - €3.00/URL (same as site cost) |
| Free trial | 14 days | 10 days |
| Per-page services (each page on the site monitored individually) | ||
| Uptime checking | Homepage every 1 min + 14 subpages every 15 min | 1 URL only, every 1 min |
| Lighthouse audits | Every monitored page, daily | 1 URL only, daily |
| AI visual regression | Every monitored page, daily, classified | Not offered |
| Broken link checking | Every monitored page, daily | Crawls up to 5,000 reachable pages from the 1 URL |
| Broken image checking | Every monitored page, daily | Included in broken-link crawl |
| Hostname-level services | ||
| SSL certificate expiry alerts | Yes | Yes |
| Domain expiry alerts | Yes | Yes |
| Sitemap sync (auto-discover pages) | Weekly | Yes |
| Mixed-content detection | Not yet | Yes |
| Monitoring data retention | 2 years (730 days) across uptime, Lighthouse, screenshots, asset checks, reports | Lighthouse: ~6 months; other monitoring data: not published in retention policy |
| Advanced monitoring controls | ||
| Custom HTTP methods (POST/PUT/PATCH for APIs) | No | Yes |
| Content keyword verification (checkstring) | No | Yes |
| Per-check frequency tuning | Fixed defaults | Yes, configurable |
| Reports your clients receive | ||
| Scheduled client-facing email report | Yes (weekly, bi-weekly, monthly, quarterly) | Not offered |
| White-label (hide vendor name) | Yes, org-level toggle | No |
| Per-client branding (logo, color, reply-to) | Yes | No |
| Drag-and-drop report builder | Yes | No |
| Recipients receive reports without a login | Yes (new external recipients confirm once; team members skip it) | No |
Sources: ohdear.app/features, docs/features/uptime, docs/features/lighthouse, docs/features/broken-links. Verified .
The upshot: to match SiteLetter's per-page coverage on a 15-page client site, an Oh Dear customer has to add 15 separate URL monitors, each counting toward their plan limit.
Quoted from Oh Dear's own uptime feature page: "a single URL uptime monitor won't automatically catch problems on other pages of your website. You'd need to add multiple URL monitors to cover different pages or endpoints."
Cost at your portfolio size
Drag the slider to your client portfolio size. Numbers update live.
Oh Dear pricing in EUR ex. VAT, sourced from their public pricing page. SiteLetter pricing in USD. Above 200 monitors Oh Dear switches to custom pricing.
Cost at common portfolio sizes
The "Oh Dear: matching coverage" column shows what Oh Dear costs when you add every monitored page as its own URL monitor (so 5 sites × 15 pages = 75 monitors), giving you the same per-page Lighthouse + uptime coverage SiteLetter provides automatically.
| Client sites | SiteLetter | Oh Dear: matching coverage (15 monitors/site) | Oh Dear: homepage only (1 monitor/site) |
|---|---|---|---|
| 5 | $25/mo | €128/mo | €13/mo |
| 10 | $50/mo | €201/mo | €22/mo |
| 20 | $100/mo | Custom | €45/mo |
Source: ohdear.app/pricing, verified .
Product-level features
Beyond per-site monitoring. This is where Oh Dear's developer-tool roots show: alert routing, integrations, SSO, and infrastructure layers built for tech teams running production stacks. SiteLetter has not prioritized these because most agencies do not need them, but if you do, this is the gap.
| Feature | SiteLetter | Oh Dear |
|---|---|---|
| Probe locations | 3 regions (EU primary + US verifier + AP tiebreaker); all data stored in EU | Multiple worldwide, primary + secondary verification |
| Alert channels | Email, Slack | 12 channels (Email, SMS, Slack, Telegram, Discord, Teams, Google Chat, Pushover, ntfy, Webhooks, OpsGenie, PagerDuty) |
| Public status pages | Coming soon | Yes, hosted separately |
| Public REST API | Coming soon | Yes |
| SSO | No | Okta, Entra, Google, SAML |
| Basic Auth / staging support | Coming soon | Yes |
| DNS record change monitoring | No | Yes |
| Cron / scheduled task monitoring | No | Yes |
| Application health (queues, disk, DB) | No | Yes |
| Ping / TCP port monitoring | No | Yes |
| DNS blocklist monitoring | No | Yes |
Sources: ohdear.app/features, features/notifications, docs/api. Verified .
Where Oh Dear genuinely wins
Oh Dear was built by engineers, for engineers, and that DNA shows in the product. It ships several infrastructure-monitoring capabilities SiteLetter does not, and a few of them matter a lot if you operate the servers your sites run on. Picking a side is not the same as pretending the other tool has no strengths.
Broader geographic probe coverage
Oh Dear monitors from multiple worldwide locations and verifies every alert from a secondary region before paging you. SiteLetter confirms any down result across 3 AWS regions (EU primary + US verifier + AP tiebreaker, with all data stored in EU) on a flat 1-min cadence. The two-region-verification pattern is similar in shape, but Oh Dear has wider geographic spread. If your client base spans more continents than EU + North America + APAC, Oh Dear catches regional issues we will not see.
Infrastructure monitoring breadth
Cron job and scheduled task monitoring, application health checks, DNS record change detection, TCP port, DNS blocklist, and reverse-monitoring are all genuine Oh Dear strengths. SiteLetter does not monitor any of these. If you operate the servers your sites run on, that gap is real.
Public status pages + authentication support
Oh Dear hosts status pages on its own infrastructure and supports custom HTTP headers, which means it can monitor Basic Auth-protected staging and authenticated API endpoints. SiteLetter monitors public-facing pages only for now; status pages are on the roadmap.
If your buying criteria is "broadest single-tool coverage of infrastructure and protocols," Oh Dear is the better tool today. If your buying criteria is "the monthly client deliverable that proves the retainer was worth it," SiteLetter is the better tool today.
Where SiteLetter is the better fit
SiteLetter was built specifically for agencies who need two things from a monitoring tool: alerts the moment a client site breaks, and a monthly client deliverable that proves the retainer was worth it. If your buying criteria is "how fast do I find out something is wrong, what gets forwarded to my client every Monday morning, and how many of their pages am I actually covering", these are the wins.
Per-page everything for one flat price
$5/site/month covers Lighthouse, screenshots, visual regression, broken assets, and uptime on every monitored page across every client site. To replicate that on Oh Dear you would buy 15 URL monitors per site. The cost difference is not 20 percent. It is roughly 3-5x at typical agency portfolio sizes.
Zero-config onboarding
Add a URL - that is the entire setup. SiteLetter fetches your sitemap, picks the 15 most important pages (ranked by depth, sitemap priority, and recency), turns on every monitoring service, seeds smart alert rules (uptime, SSL and domain expiry escalations, Lighthouse threshold), and pre-builds your weekly and monthly report templates. You add recipients and you are done. With Oh Dear every piece is manual configuration after the URL, and there are no scheduled reports to pre-build.
AI-classified visual regression
Daily screenshots compared against yesterday for every monitored page. An AI classifier sorts each diff into a bucket - rotating ads and banners get auto-dismissed, intentional content updates are logged in the next scheduled client report, a real layout break or missing asset is emailed within the hour. Oh Dear does not offer visual regression in any form.
Branded reports your clients open
Per-client logo, brand color, custom CTA URL, reply-to address. Org-level white-label toggle hides "SiteLetter" from clients entirely. Reports are delivered as branded HTML emails on your schedule. New external recipients verify their email once via a one-click link on the first report; team members on the account skip that step. Either way, no SiteLetter login required. Frequencies: weekly, bi-weekly, monthly, quarterly.
Drag-and-drop report builder
Reorder sections (Performance, Uptime, Visual Changes, SSL & Domain, Broken Assets, Portfolio Overview), toggle metrics on or off, pick the frequency. Configured per client. The default works for most agencies; the builder is for when a client asks for something specific.
The recipient flow agencies actually want
Two delivery flows, both branded as your agency: send reports straight to clients on your schedule, or send them to yourself first so you can review before forwarding manually. Either way, recipients never see a SiteLetter login screen (new external addresses verify once with a one-click link on first send; team members and returning recipients skip the step). Oh Dear has no equivalent flow.
Lighthouse with stable scoring
Cold-cache Lighthouse can swing 15-20 points between consecutive runs on the same page, which makes raw scores unusable as a trend in a monthly client report. SiteLetter pre-warms DNS, TLS, and CDN caches before every audit, on every monitored page, every day, so the score the client sees is a real signal rather than a random walk.
2-year Lighthouse history
We keep every Lighthouse audit on every monitored page for 2 years (730 days) - uniform across all data types and all subscribers. Oh Dear keeps Lighthouse history for roughly 6 months per their own changelog. If your client retainer relies on showing month-over-month or year-over-year performance trends, the depth of history matters and SiteLetter keeps 4x as much of it.
When to pick which
Three honest scenarios.
Agencies, any size
From your first client to your fiftieth. The per-page coverage, branded reports, and recipient flow are built around the agency job - delivering monitoring value clients can see. Meaningfully cheaper than the equivalent Oh Dear setup at every portfolio size when you want per-page coverage.
DevOps team, infrastructure
Queues, crons, custom services, multiple regions. The cron heartbeat, application health, DNS record monitoring, ping/TCP, and multi-region uptime probes are built for your job. SiteLetter does not monitor those layers.
One personal or small site
Just want "tell me when it goes down". Oh Dear at the 5-site bucket is cheaper and does single-URL monitoring well. SiteLetter is overkill until you are juggling multiple sites and want client-facing reporting.
SiteLetter vs Oh Dear: FAQ
It depends on what you mean by "site". If you only monitor the homepage of each client site, Oh Dear is cheaper at every volume. If you want per-page coverage (Lighthouse, visual regression, uptime on inner pages), SiteLetter is roughly 3-5x cheaper at typical agency portfolio sizes because you are paying for one site instead of 15 separate URL monitors.
No. Oh Dear monitors uptime, performance, SSL, broken links, mixed content, DNS, cron jobs, application health, and a few protocol-level checks (ping, TCP, DNS blocklist). It does not screenshot pages or detect visual changes. SiteLetter takes a daily screenshot of every monitored page, diffs it against yesterday, and uses AI to classify each diff as noise (rotating banners), intentional updates (logged in the weekly report), or real breakage (emailed immediately).
Not in the agency-deliverable sense. Oh Dear ships hosted public status pages, but does not offer scheduled branded weekly or monthly reports with your agency logo, brand color, custom reply-to email, or a recipient confirmation flow. SiteLetter is built around exactly that workflow.
For broken-link checking, yes. Oh Dear's broken-link crawler reaches up to 5,000 pages per site, starting from one URL. Those crawled pages are not individually uptime-checked or Lighthouse-tested, only scanned for broken links and mixed content. SiteLetter covers up to 15 pages per site for all services (Lighthouse, visual, uptime, broken assets), which is a different and usually more useful coverage shape for agencies.
Public status pages, cron job monitoring, application health checks, DNS record change detection, ping and TCP port monitoring, more alert channels (PagerDuty, OpsGenie, SMS, Discord, Telegram, Teams), a public REST API, and SSO. If those are part of your buying criteria, Oh Dear is the right tool today. (Multi-region probes used to be on this list; as of May 2026 SiteLetter triangulates from 3 regions too - EU primary + US verifier + AP tiebreaker, with all data stored in EU.)
AI day-over-day visual regression that classifies each diff as noise / intentional / breakage (Oh Dear does not screenshot pages or detect visual changes). Per-page Google Lighthouse on every monitored page daily with DNS/TLS/CDN cache warmup (Oh Dear has uptime, broken-link, and certificate checks but no per-page Lighthouse four-score breakdown). Branded scheduled per-client email reports with per-client logo, brand color, reply-to, and a one-click confirm flow for new external recipients (Oh Dear has hosted public status pages, not scheduled per-client deliverables). Sitemap auto-discovery: add a domain, SiteLetter picks the 15 most important pages and seeds monitoring rules at $5/site flat (Oh Dear bills one URL per "site", so matching SiteLetter's 15-page coverage means buying 15 separate URL monitors).
Yes - and it is usually faster than the original Oh Dear setup was. Your Oh Dear monitor list collapses into a much shorter SiteLetter site list, because each SiteLetter site covers up to 15 pages automatically (a 100-monitor Oh Dear setup is typically 7-10 SiteLetter sites). Add each unique site once and SiteLetter handles the rest: sitemap fetch, page selection, every monitoring service enabled, smart alert rules seeded, and weekly + monthly report templates pre-built. The 14-day free trial includes one site, so pick one client site to validate the full experience on before subscribing and bringing the rest over.
Still have questions? Contact us
Comparison based on publicly available Oh Dear pricing and feature documentation, last verified . Oh Dear is a trademark of its respective owner, used here for identification and comparison purposes only. SiteLetter is independent and not affiliated with, sponsored by, or endorsed by Oh Dear. For the most current Oh Dear pricing and feature information, see ohdear.app.
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SiteLetter is the kind of tool you forget you're using, until your client thanks you for the report you didn't write.
- ✓ 2-minute setup. Add a URL. We auto-discover pages, seed alerts, schedule reports.
- ✓ No scripts to install. We monitor from the outside, like a real visitor.
- ✓ Cancel anytime. No credit card to start, no contract.