--- title: The best SSL certificate monitoring tools in 2026 description: Certificate expiry is the most preventable outage there is, and it still happens constantly — usually because the alert went to someone who left, or because the tool only checked the certificate the CDN presents. Here is what each tool actually checks, and what most of them miss. canonical: https://watchfor.io/blog/best-ssl-monitoring-tools --- [All posts](/blog) [Monitoring](/blog/category/monitoring) Sep 11, 2026 · 4 min read · WatchFor Team # The best SSL certificate monitoring tools in 2026 Certificate expiry is the most preventable outage there is, and it still happens constantly — usually because the alert went to someone who left, or because the tool only checked the certificate the CDN presents. Here is what each tool actually checks, and what most of them miss. An expired certificate is the most preventable outage in this business. It has a known date, months of warning and no ambiguity — and it still takes down household names every year, because the reminder went to an inbox nobody reads any more. Most tools on this list will tell you a certificate expires in 14 days. The differences are in what else they check, and in the four failure modes that are not expiry at all. Prices checked against each vendor's public pricing page on 11 September 2026 . ## What certificate monitoring should actually check Expiry is the easy part. Before the list, the things worth checking that a "days remaining" counter does not cover: The chain, not just the leaf. A certificate that is valid while its intermediate is missing fails on exactly the clients that do not fetch missing intermediates — often the ones you care about, like an API consumer on an older stack. Your browser hides this by caching the intermediate, so it looks fine to you and breaks for them. The certificate each region is actually served. With a CDN in front, the certificate is the CDN's, and a stale one in a single PoP is invisible from one vantage point. What the endpoint negotiates. A valid certificate over TLS 1.0, or with a weak cipher suite, passes an expiry check and fails a compliance review. Every hostname, not just the apex. Certificates are per-hostname. The one that expires is usually on the subdomain nobody remembers — the staging API, the webhook receiver, the mail host. ## The tools ### WatchFor Ours, so discount accordingly. SSL monitoring on the free plan (15 monitors, commercial use allowed), €7/month for 50. Does well: checks the chain and expiry from a fleet of 20 locations, so a stale certificate in one PoP shows up. A separate TLS grade scan covers protocol versions and cipher suites with a "grade below X" alert rule, and domain expiry is its own monitor type — the other date that ends a site. The certificate check itself is on the free plan. The TLS grade, domain expiry and multi-region checking are not: a free monitor runs from one region, and those three start at €7/month. Falls short: no certificate inventory discovery. You tell us which hostnames to watch; we do not crawl your estate to find the ones you forgot, and the forgotten one is usually the problem. ### UptimeRobot 50 monitors free at five-minute intervals; €9/month for Solo. Does well: the largest free monitor allowance here by a distance, and certificate expiry alerts at 30, 14 and 7 days once you are on a paid plan. Falls short: certificate monitoring is not on the free tier at all — their pricing page states that SSL monitoring is included only in paid plans, and domain expiry sits behind the same upgrade. Expiry-focused throughout — no TLS grading. ### StatusCake 10 uptime tests free with 1 SSL test; €19.99/month for Superior, which includes 50 SSL tests. Does well: a dedicated SSL test type with its own reporting. Falls short: SSL tests are a separate allowance from uptime tests, so covering 100 sites for both needs both pools to be large enough. ### Oh Dear No free plan; $17/month for two sites, every feature on every plan. Does well: certificate health alongside broken links, mixed content and uptime, all per site. Mixed content in particular is a certificate-adjacent problem most tools ignore. Falls short: priced per site, so a handful of domains with many subdomains gets expensive. ### Site24x7 Free tier up to 50 resources; about $9/month yearly for 25 websites. Does well: certificate monitoring inside a broader IT suite, so it sits next to server and network monitoring. Falls short: the console is built for an IT department, and certificate monitoring is one line item in a much larger suite. ### Better Stack Free tier 10 monitors; $29/month yearly for a responder licence including 10. Does well: certificate alerts land in the same incident and on-call workflow as everything else. Falls short: you are buying the platform. For certificates alone it is a lot of product. ## Side by side Tool SSL on free plan TLS grade Domain expiry Multi-region check WatchFor Yes From €7/mo From €7/mo 2 regions from €7/mo, 7 on Business UptimeRobot No No Paid plans Paid plans StatusCake 1 test No Yes Yes Oh Dear No free plan No No Yes Site24x7 Yes Partial Yes 32 on entry Better Stack Yes No Yes Yes Checked 11 September 2026 against published pricing. ## Three things to set up whichever you pick Alert at 30 days, not at 7. Seven days is enough time to renew and not enough to discover that the renewal needs a purchase order, a DNS change or somebody who left the company. Send it somewhere a team sees. The most common cause of an expiry outage is not a missing monitor — it is a monitor alerting to one person's inbox. Route it to a channel. Monitor the subdomains. The apex is the one everybody remembers. The outage is nearly always the staging API, the webhook endpoint, or the mail host with its own certificate. We make one of these. Our gap — no discovery of certificates you forgot you had — is named above, because on this particular problem it is the most likely thing to bite you. More detail: [SSL certificate monitoring](/ssl-monitoring), or check one now with the free [SSL checker](/ssl-checker). [#monitoring](/blog/tag/monitoring)[#ssl](/blog/tag/ssl) ## Monitor your SSL/TLS certificates Get alerted well before certificates expire or a handshake breaks — checked from locations worldwide. [Learn more](/ssl-monitoring)[Start free](/auth/sign-up) Share this article --- Canonical page: https://watchfor.io/blog/best-ssl-monitoring-tools · Site guide: https://watchfor.io/llms.txt