Comparison
Keel vs Site24x7
This page is for people watching a handful of URLs who searched "Site24x7 alternative" and want to know whether the smaller tool does the job — not for anyone who needs fifty monitors for free, because on that count Site24x7 wins and we'd rather say so.
The comparison
Site24x7's figures below are from their free-plan page and their pricing page as of October 2026 — USD amounts as served to us. Keel's are from ours. Both will drift; the shape of the difference won't.
| What you get | Keel | Site24x7 |
|---|---|---|
| What it is | Single-purpose uptime monitor. Nothing else, on purpose. | All-in-one monitoring platform from the ManageEngine family: website, server, network, application, logs, and real-user monitoring under one account. |
| Free tier | 3 monitors, 5-minute checks, webhook alerts, 30-day history. | 50 website availability monitors at 5-minute checks from 1 location, email alerts, and 1 public status page — free forever, no credit card. |
| Paid pricing | £5/month flat — 50 monitors, 60-second checks. No seats, no add-ons, no usage tiers. | Web Uptime $10/month ($9 annually) — 25 availability and performance monitors, 1-minute checks, 32 locations, 3 status pages. Web Perf $39/month ($36 annually) adds transaction and page-speed monitoring. Enterprise Plus Web $999/month ($899 annually) at 2,500 monitors and 30-second checks. |
| Alerting | Webhooks only — down, up, or both, to any HTTPS endpoint, on every plan including Free. Payloads are plain JSON, so Slack, Discord, and curl work without adapters. Failed deliveries retry once. | Email on Free. Web Uptime adds SMS; Web Perf adds voice calls and webhooks, plus third-party integrations including Slack, PagerDuty, and Microsoft Teams on paid plans. |
| Incident threshold | Two consecutive failures open an incident; one blip is ignored on purpose. The first passing check closes it and fires up. | Not published as a single number; alerts follow the threshold settings on each monitor. |
| Check types | HTTP and HEAD, against a status code you choose. Redirects are not followed — a 3xx counts as down unless you set it as the expected code. | HTTP/HTTPS, SSL certificate validation, and ping on Free; DNS, port, API, real-user, web-transaction, and page-speed monitoring on the paid tiers. |
| Status pages | Not offered. | 1 public status page on Free, 3 on Web Uptime, 10 on Web Perf. |
| History | 30 days of every check — status, status code, latency, error text. | No single figure published on the pages cited above; performance dashboards and uptime SLA reports are listed as included on the free plan. |
When Keel is the better fit
When the URLs are few and the webhook is the point.
You want one price, not a product matrix
Fifty monitors at 60-second checks is £5/month flat on Keel — the whole schedule, enforced server-side. Site24x7's nearest uptime tier is Web Uptime at $10/month ($9 annually) for 25 monitors — and it sits inside a catalogue of infrastructure, all-in-one, and MSP plans, each with its own add-on packs.
Your alert pipeline is the webhook
If alerts already flow into Slack, Discord, or a receiver of your own, Keel's webhook is on every plan including Free — plain JSON with a readable summary plus the full monitor, check, and incident objects. On Site24x7, webhooks arrive with the Web Perf tier at $39/month.
One blip shouldn't wake anyone
Keel opens an incident after two consecutive failures, deliberately: a single timeout is usually noise, and noise that wakes you is a cost. The first passing check closes the incident and fires up, so the alert always matches the history you can see.
You'd rather not evaluate a platform
Site24x7's pricing page offers website, infrastructure, all-in-one, and MSP plans, each with monitor packs and add-ons. Keel has one thing to configure: add a URL, choose the expected status code, point a webhook at it, done — the free tier is playable without paying anything.
When Site24x7 is the better fit
Often, honestly — and the first reason is the big one.
You need more than three monitors for free
Site24x7's free plan is 50 website monitors at 5-minute checks against Keel's 3 — with email alerts and a public status page included. On quantity for nothing, they win outright, and no framing changes that arithmetic.
You monitor more than websites
Servers, networks, applications, logs, cloud spend, real users — Site24x7 is an entire observability platform with a decade of ManageEngine behind it. Keel watches URLs and stops there, on purpose.
Certificates, transactions, and page speed
SSL certificate validation is on Site24x7's free plan, and paid tiers add DNS, port, API, web-transaction, and page-speed monitoring. Keel does HTTP and HEAD against an expected status code, and nothing else.
Locations, voice alerts, and teams
Checks from 32 locations on Web Uptime, SMS and voice-call alerting, multiple users per account, 30-second intervals at the top tiers. Keel checks from one place at 60 seconds max, single-user, and its webhook is the whole alerting surface.
Pick the small one on purpose.
If you need fifty free monitors or a whole observability platform, use Site24x7 — it's the better tool for that. If you need a handful of URLs watched and a webhook fired when they break, that's £5/month and about a minute of setup.
The webhook payload and public API are documented at keelmonitor.com/docs; the two-line price list lives at keelmonitor.com/#pricing.