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Link checkers such as Xenu Link Sleuth (http://home.snafu.de/tilman/xenulink.html) can alert you to pages that have disappeared or that are redirecting users to another site, but changes to the content are equally if not more important. There are many services that track web page content for changes. Some are free whilst other priced services may offer limited facilities as a free taster.

This lists includes both web based services and software programs for PCs and Intranets.

Web based services

Change Detection

URL: http://www.changedetection.com/

This is a free service allowing you to track an unlimited number of pages. The frequency of the alerts can be daily, weekly or monthly and you can choose to only have alerts for “sizeable changes”, when content has been added or removed, or for specific keywords. The email merely alerts you to the fact that there have been changes; you have to click on a link in the email to view them in the Change Detection web site. RSS as well as email alerts avialable.

ChangeDetect

URL: http://www.changedetect.com/

The home page gives the impression that this is a totally free service. It isn’t. The free trial version of this service allows you to track a maximum of 5 pages and lasts for two weeks. You can receive web page change notifications via email, ICG or text message. The subscription services allow you to track more pages and password protected pages. ChangeDetect Personal costs USD 1.95 a month and tracks 10 web pages. ChangeDetect Plus costs USD 14.95 a month for 100 web pages and allows you to set up keyword and phrase notification triggers and colour coded notifications. ChangeDetect Professional costs USD 39.95 a month for 500 web pages with content checked twice-daily.

Femtoo

URL: http://femtoo.com/

This service allows you to have up to 10 “trackers” and a maximum of 5000 characters tracked for changes free of charge. There are a number of plans that allow more trackers and additional options which can be found at http://femtoo.com/plans/. You can select the content to be tracked and how it is to be treated (text or numerical). Alerts can be delivered by email, SMS and a personal Tracker RSS Feed. Content is checked every 30 minutes.

FollowThatPage

URL: http://www.followthatpage.com/

The free service provides 100 daily page checks and 1 hourly check. You can track additions, deletions, Google page rank, keywords, and sections of a page. Alerts are sent to you by email. The Pro account gives you 1000 daily checks, 20 hourly checks, 5 10-minute checks and 100 weekly checks.

Infominder

URL: http://www.infominder.com/

The free trial tracks up to 10 pages free of charge for 30 days and allows you to associate categories and descriptions with a “minder”. Within the advanced options you can specify how often, in days, the page is to be checked. The most frequent check allowed for free is every 1 day. You can also specify the minimum number of changes that must occur before you are notified and any keywords or phrases that must appear in the changes.

Infominder Professional costs USD 30/yr to track 100 pages, USD 60/yr for 250 pages, USD 120/yr for 500 pages and USD 250 /yr for 1000 pages