We make one of these, so read this knowing that. What we can promise is that every price below was read off the vendor's own pricing page on 2026-08-23, that we say plainly when a competitor is the better choice, and that we have not put ourselves first.
SEO monitoring is the continuous checking of a live site for changes that affect whether search engines can crawl and index it. It is not an audit. An audit is a snapshot you take; monitoring is a watch you leave running. The distinction matters because the failures that cost the most traffic are the ones nobody was looking for: a noindex that ships with a Tuesday deploy, a Disallow added to clean up staging, a canonical that starts pointing at the wrong URL.
Uptime monitoring does not catch these. A page can return 200 with perfect uptime and carry a directive that removes it from search entirely.
| Tool | Price | What it is | Alerts |
|---|---|---|---|
| Little Warden | from £24.99/mo | continuous SEO change monitoring | continuous |
| stillindexed | $29/mo, $79/mo, $249 once | continuous SEO change monitoring | continuous |
| Conductor (was ContentKing) | no public price | enterprise real-time monitoring | continuous |
| Screaming Frog | £199/yr, free to 500 URLs | desktop crawler | none, you run it |
| changedetection.io | $8.99/mo, free self-hosted | generic page change detection | continuous |
Prices checked 2026-08-23. Vendors change them; follow the links to confirm.
From £24.99/mo. 20 URLs on Freelancer, 650 on Agency at £59.99.
The established tool in this category and the one we are most often compared with. It watches a similar set of signals, it has been doing it for years, and it offers a 40 day trial with no card. We offer no trial at all, so if trying a monitor properly before spending anything matters to you, this is the honest answer and you should start here.
$29/mo Starter, $79/mo Agency, $249 once for lifetime.
Starter is 10 sites at up to 25 URLs each, checked every 30 minutes. Agency is 50 sites at up to 25 URLs each, checked every 15 minutes. Alerts go to Telegram, email and Slack, and the check that matters is a semantic diff: we alert when a directive changes, not when the HTML churns.
Pick us when you are watching a lot of URLs across a lot of client sites and want the alert in minutes rather than hours.Do not pick us when you want to trial software before buying, because we do not offer one. What we offer instead is an unconditional 30 day refund and every check available as a free ungated tool, so you can see exactly what the engine does before you spend anything.
No public pricing. ContentKing was absorbed into Conductor.
ContentKing was the reference product in this space and is now Conductor Website Monitoring. Its old pricing page redirects to a Conductor trial form, which tells you the shape of the offer: sales-led, contract, enterprise features. If you need SSO and a procurement process, that is the right shape. If you are one person with fifteen client sites, it is not.
£199/year. Free up to 500 URLs.
The best tool here at what it does, which is crawling an entire site once and letting you dig through everything. It is a desktop application, not a monitor, so it only ever sees what you tell it to look at while you are sitting in front of it. Most people should own it and a monitor; they answer different questions.
$8.99/mo hosted, free self-hosted, open source.
Genuinely good, genuinely cheap, and open source. The catch for this use case is that it detects that a page changed, not that a directive changed. A reworded paragraph and a newly added noindex look the same to it, so you either tune selectors by hand for every page or you accept the noise. If you enjoy that kind of tuning, the price is unbeatable.
Semrush Site Audit and Ahrefs Site Audit run on a schedule, typically daily or weekly, as one feature of a large suite. If you already pay for either, use it, and understand that a weekly crawl finds a Tuesday noindex on Sunday.
Uptime monitors such as UptimeRobot answer a different question. They confirm the server responded. They do not read what it responded with.
Lumar, Oncrawl and Botify are enterprise crawl platforms. Powerful, priced accordingly, and none of them publish a number.
Every check our monitor runs is available as a free tool with no account and no email gate. Run one on a client URL now, and if the result is fine, that is the point: monitoring is for the day it is not.