MonSpark

MonSpark is one of a kind multi-tool - not just uptime...

I think that many people could pass this offer indifferently, thinking that it is just another website uptime monitoring tool like Better Uptime or gazillion marketplace apps, builds on popular and quite cheap php script which can be installed and operated by virtually anyone without any technical knowledge (I'm not mentioning the name to avoid advertising it).

In MonSpark you can monitor many other aspects of websites - for example, only a single text on a given page - it could be the price of the product you want to follow or anything else.
There are a lot of functions here, and I must admit that I do not know any other tool on the market with such wide possibilities.

P.S. One feature request - MonSpark Chrome extension will be very helpful, especially for instantly setting up text monitoring, without having to run the entire application