SSL Certificate Monitoring Tools: Coverage Caps and Pricing

Most uptime tools that advertise SSL monitoring cap it separately from your uptime checks, so you end up watching fewer certificates than sites. StatusCake Superior gives 100 uptime monitors and 50 SSL monitors, and Business gives 300 and 100, so certificate coverage falls from half your estate to a third as you pay more. Uptimehub, UptimeRobot and Site24x7 draw certificate checks from the same pool as everything else, which means coverage cannot silently fall behind. Check the SSL row before the price row, because that is the number that decides whether a certificate can expire without anyone hearing about it.

Certificate expiry is a strange failure mode. Nothing degrades, nothing gets slower, and no error rate creeps upward. The site works perfectly right up to a timestamp, and then every browser in the world refuses to load it and shows a full page security warning to your customers. There is no partial outage and no grace period. It is the most predictable outage in software and it still takes down household names every year.

That has always been an argument for monitoring certificates. What changed recently is the arithmetic.

Why this became urgent in 2026

The CA/Browser Forum passed ballot SC-081v3 in April 2025, with 29 votes in favor and none against, and it puts publicly trusted TLS certificate lifetimes on a dated downward schedule. Since March 15, 2026 the maximum is 200 days. It drops to 100 days on March 15, 2027 and to 47 days on March 15, 2029. We covered the full ballot and what it does to renewal workload in the certificate lifetime changes breakdown.

An organization running fifty certificates handled about one renewal a week under the old rules. At 47 days that becomes 388 renewals a year, which is more than one every day including weekends. Any process built on a calendar reminder has already stopped working. Automation handles the renewal itself, but automation fails quietly, and the only thing that catches a silently failed renewal is something watching the certificate that is actually being served.

So the question stops being whether you monitor certificates and becomes how many of them your plan actually lets you monitor.

The trap: SSL monitors are usually a separate allowance

This is the part that catches people, and it is almost never mentioned in comparison articles. Several vendors do not treat a certificate check as just another monitor. They run a separate pool with its own cap, and that cap is smaller than your uptime cap.

StatusCake is the clearest example, and its numbers are published on its own price list. Superior at $24.49 a month includes 100 uptime monitors and 50 SSL monitors. Business at $79.99 includes 300 uptime monitors and 100 SSL monitors. Read those as ratios and something odd appears.

Certificate coverage goes down as the price goes up. Nobody designed that deliberately, it just falls out of bundling two meters into two tiers, but the practical result is real: if you fill a Business plan to its uptime limit, two hundred of your sites are being watched for downtime and not for the single most predictable cause of downtime there is.

Domain monitoring behaves the same way on that vendor, covering 50 percent of your uptime monitors on Superior and 40 percent on Business. We broke the whole allowance matrix out on the StatusCake pricing page, including the four places where the ladder runs backwards.

How the main tools handle certificate checks

The useful distinction is not which vendors offer SSL monitoring, because effectively all of them do. It is whether a certificate check draws on the same allowance as everything else, or on a smaller separate one.

Two things are worth calling out honestly. StatusCake is the only tool in that table with a genuinely separate SSL allowance, and it is also one of the cheapest tools in the category, so for a team with fewer than fifty certificates the cap never binds and the price is excellent. And free tiers are close to useless for this specific job: StatusCake allows one SSL monitor free, and UptimeRobot does not include certificate checks on its free plan at all.

What a certificate monitor should actually check

Expiry date alerting is the headline, but a certificate can break your site while its expiry date is still comfortably in the future. A monitor worth paying for checks several things, and our own SSL monitoring runs the same list on every plan.

• Days until expiry, with alerts far enough ahead to act. At a 47 day maximum lifetime, a 30 day warning fires when the certificate is barely two thirds through its life, which is too noisy. Under the new schedule the sensible thresholds move closer in.
• Chain completeness. A missing intermediate certificate validates fine in some clients and fails in others, which produces the worst kind of bug report: it works on the developer's laptop and breaks on a customer's phone.
• Hostname coverage. A certificate valid for example.com and not www.example.com is a live incident for half your traffic.
• Trust chain verification against a real store. This matters more than it sounds. A self signed certificate, an untrusted root and an incomplete chain all parse as structurally valid. If a checker only reads the certificate rather than verifying it, all three look healthy while every browser shows a warning.
• Revocation status, which is the one case where a certificate with a perfectly good expiry date has already stopped being trustworthy.

If you want to see what those look like on a host you own right now, our SSL certificate checker runs all of them, including a separate trust store verification probe rather than only parsing the certificate. It is the quickest way to find out whether the thing you assume is fine actually is.

Buying advice, by situation

If you would rather wire this up yourself first, how to monitor SSL certificate expiration walks through the manual approach and where it stops scaling.

Fewer than 50 certificates and a small team. Almost anything works and price should decide. StatusCake Superior at $24.49 is hard to beat, and its separate SSL pool of 50 will not bind on you. Take the annual billing, which is two months free.

An agency or MSP with client sites. Count certificates per client and multiply. Ten clients with a marketing site, an app subdomain and an API is thirty certificates before anyone has asked for a staging environment. The separate pool question becomes the deciding one quickly, and so does whether unbranded reporting is included. StatusCake includes white label reporting from its $24.49 plan, which is earlier than most rivals gate it. The wider agency question, where the bill is set by status pages and seats rather than monitors, is worked through in the agency and MSP comparison.

More than 100 certificates. Insist on one pool. At this size the separate allowance is not a pricing detail, it is a coverage gap you will forget exists until the quarter it bites. This is also the point at which certificate expiry tracking stops being a monitoring task and becomes an operations discipline in its own right. It is not unique to TLS either; finance and operations teams run the identical drill against vendor paperwork, which is why tracking certificate of insurance expiry dates grew into its own software category rather than living in a spreadsheet.

Regulated or audited environments. Check which tier carries the audit log. On StatusCake that is Business only, and the same is true of payment by invoice, which some finance departments require before they will approve a vendor at all.

Frequently asked questions

What is the best SSL certificate monitoring tool?

There is no single best one, but the selection rule is simple: pick a tool where certificate checks draw on the same monitor allowance as everything else, so your coverage cannot fall behind your site count. For small estates StatusCake is excellent value at $24.49 a month. For estates above 100 certificates, or where every site must be covered, a flat per-monitor tool avoids the separate-pool problem entirely.

How much does SSL certificate monitoring cost?

Between $9 and $25 a month for most teams. Uptimehub starts at $9, Site24x7 at $10, UptimeRobot at $12 and StatusCake at $24.49. Certificate monitoring is almost never sold on its own, so you are buying an uptime monitoring plan that includes it. The figure that actually varies is how many certificates that plan lets you watch, which ranges from 1 on a free tier to your entire monitor allowance.

Can you monitor SSL certificates for free?

Only at a scale that will not help a business. StatusCake's free tier allows exactly one SSL monitor, and UptimeRobot excludes certificate checks from its free plan. A free tier is fine for a single personal site. For a company, the certificate you forget is by definition not the one you set up manually, so a plan that covers everything is the point.

How far in advance should you get certificate expiry alerts?

Enough time to renew twice if the first attempt fails, which used to mean 30 days and now means less. With a 200 day maximum lifetime a 30 day warning is reasonable. Once 47 day certificates arrive in 2029, a 30 day alert would fire when the certificate is only two thirds used, so 14 and 7 day thresholds become the practical pair. Alert on the certificate being served, not on your renewal system reporting success.

Why did my certificate renew but the site still shows an error?

Almost always because the new certificate was issued but never deployed, or was deployed to one server behind a load balancer and not the others. The renewal system reports success because it did its job. Only a check against the live endpoint catches the gap, which is the argument for monitoring the served certificate rather than trusting the automation.

The short version

Certificate lifetimes are on a published schedule down to 47 days, renewal volume is roughly eight times what it was, and automation is now doing the work. Automation that fails quietly is the whole risk, and the only thing that catches it is a check against what is actually being served. When you compare tools, find the SSL row first and see whether it matches the uptime row. If it is smaller, work out which of your sites you have decided not to watch, because the plan has already decided for you.