The care-plan tools,
plotted side by side

Flat for up to 100 WordPress installs, so it carries these 10 sites and 90 more for the same money, and nothing that is not WordPress. Its Performance Check grades PageSpeed and YSlow rules, and it compares screenshots only during Safe Updates, at any rung.

The bundle switches on every add-on except Vulnerability Protection at once, which is why it is the rung quoted here. Bought singly those add-ons run $1 to $2 per site per month each on top of a free tier, so an agency that only wants homepage uptime pays far less than this figure.

Their base plan covers WordPress plugin and theme updates, uptime and encrypted backups on all 10 installs. Matching the checks on this page needs their security add-on and Hourly Backups on top, listed at €2 and €2.49 per install. Both add-ons are published in euros only, so the all-on figure is a euro one: €64.80 for 10 installs, against their €1.99 base.

WordPress only. Per-page Lighthouse and day-over-day visual regression are not on their published pricing page as of September 2026. The base rate is EUR 1.99, published alongside the $2.19 figure by WP Umbrella.

Covers all 10 installs at their full feature set, but only WordPress and Joomla ones: maintenance, uptime and security scans. No Lighthouse, no day-over-day visual regression, and domain expiry alerts are not in the product.

Billed per install rather than by tier, so there is no cap to run into. Their free tier is $0 with reduced limits.

Carries one homepage check per site across the 10 sites, plus SSL and domain expiry. No Lighthouse, no scheduled branded client report, and their page-change detection is a separate free tool rather than a monitor type inside the plan.

Their paid ladder starts at €9/mo on the annual rate for Solo plan, 10 monitors (€10 month to month) and stops at €149 for 500 monitors, above which they quote Enterprise on request. That ladder only matters here if you want more than one check per site.

Carries one uptime check per site across the 10 sites, which is a cheap and complete answer if uptime is the whole job. Their page-speed check uses YSlow methodology rather than Lighthouse, there is no day-over-day visual regression, and no per-client branded report at any tier.

Reaching every page on the daily visit Visual Changes makes would move them a long way up their Quantity ladder, which is a different purchase and not what this card prices. Real User Monitoring is a separate Pingdom product on its own meter and is not counted here.

Carries uptime on all 10 homepages comfortably, alongside SSL and domain checks, from a 43-location probe network with 30-second intervals. Their page-speed pool is separate and caps at 30 monitors, and it is not a Lighthouse four-score audit.

No Lighthouse four-score breakdown and no day-over-day visual regression at any tier. Their free plan carries 3 uptime monitors at 15-minute intervals, so uptime alone on these 10 homepages starts at their Superior plan, 100 uptime monitors at 1-minute intervals, €16.66/mo billed annually. EUR is what they publish, so no conversion is applied here.

Homepage uptime on all 10 sites fits inside their free 20 monitors, with one basic status page (a custom domain for it starts on Essentials), so on uptime alone Hyperping beats SiteLetter outright at this size. No Lighthouse and no day-over-day visual regression at any tier, and their branding story is the status page rather than a scheduled per-client email report.

Their paid ladder, on the annual rate, runs Essentials at $24/mo for 50 monitors, Pro at $74/mo for 100, and Business at $249/mo, where white labeling begins ($299/mo month to month); on-call and escalation policies start on Essentials. The figures are USD per their terms, and their pricing page shows the same figures with a euro sign to EU visitors.

The software is free at any number of sites, so there is no rung to cap out. The spend is yours instead: a VPS at roughly $5 to $20/mo, plus however long patching, backups and watching the watcher takes on your own setup. No Lighthouse, no visual regression, no scheduled client reports.

That $0 is the price the project itself publishes, and the hosting range is what the droplet providers list. The ops time is not a figure SiteLetter has measured, so no number is put on it.

Homepage uptime on all 10 sites fits exactly inside their free 10 monitors, so on uptime alone Checkly beats SiteLetter outright at this size. Their Playwright browser checks are also a far more powerful way to assert that a checkout still works than anything SiteLetter does.

Their paid ladder is Starter at $24/mo for 50 monitors and Team at $64/mo for 75, above which they quote Enterprise on request. Visual comparison ships as Playwright snapshot tests from Team up, a CI baseline rather than a day-over-day diff, and Lighthouse is not first-class.

Homepage uptime on all 10 sites fits inside their permanent free 10 monitors, at a faster interval than SiteLetter's, so on uptime alone Better Stack beats SiteLetter outright at this size. They also ship real on-call: schedules, escalation policies, incident merging and phone alerts. No Lighthouse, no day-over-day visual regression, no scheduled branded client report.

Beyond the free 10, Better Stack prices monitors in blocks rather than tiers, at $25/mo per additional 50 ($21/mo on annual billing). Responder seats, extra status pages, Playwright minutes and log bundles meter separately, and status-page white-label is $250 per page per month on top.

Reaches one URL per site for uptime and for Lighthouse, which runs daily on that one URL on a simulated mobile device. The daily visit Visual Changes makes reaches up to 15 pages per site on two devices, and Page Scores audits every one of them. Their broken-link crawl goes deeper into a site than SiteLetter's does, up to 5,000 pages from one URL. Their pricing page publishes branded client reports and a reseller account, so the deliverable gap is cadence and shape: one monthly report against a report built to be forwarded on a weekly, bi-weekly, monthly or quarterly schedule from a drag-and-drop builder. Visual change detection is not on their published feature list as of September 2026.

One Oh Dear monitor tracks one URL. EUR excluding VAT is what they publish, so no conversion is applied here, and their annual cadence is cheaper: 2 months free.