Prolific Assistant. Make sure you never miss out on a Prolific study again.

As I've mentioned before, by far my favourite, "survey," site is Prolific, which pays you to take part in academic research studies, mostly of less than half an hour in length. The studies are usually interesting and, generally, have a healthy pay rate.

There is, however, one problem with Prolific, and that's that it hardly ever emails you to let you know there are studies available. On top of that, studies are often snapped up within minutes of appearing, meaning you can miss out on them completely.

To get round this problem, you can always have the site's Studies page permanently open, with Super Auto Refresh set to reload the page every minute or so. However, that isn't necessarily the most convenient of things and, if everyone does it, it's in danger of slowing the site down to a halt.

Fortunately, there is a better way. And that's to use Prolific Assistant, an extension to your browser, which alerts you whenever a Prolific study's available. At the moment, Prolific is testing a new Beta version of its site, which isn't yet, it seems, compatible with Prolific Assistant. However, the extension still works fine with the old version of the site and I'd assume the extension will be updated to work with the new version of the site before too long.

If you do use Prolific Assistant, make sure to have it set to listen for changes to Prolific at intervals of more than 60 seconds, so that it doesn't put too much strain on the site's servers, which could cause problems with page loading.

Prolific Assistant is highly recommended and you can get it by going to the Google Chrome Web Store. Rest assured that's not a referral link and I won't make any money from you using it.

This, however, is a referral link. Use it to sign up to Prolific and both you and I could make money from it.

AppTrailers. Make money from ignoring videos.

AppTrailers is an app associated with Perk, a rewards site I've not mentioned before, and it's an app that pays you to watch videos.

Or, at least, it pays you to watch the ads that play between the videos.

The good news is you don't actually have to watch either the videos or the ads because it has no way of knowing whether you're watching or not.

Once you've downloaded AppTrailers to your phone, launched and registered it, you'll be given a choice of video channels to watch and then you can just start them playing. Of its various channels, I'd recommend Rapid Reviews, as its videos are short.

Around every half an hour or so, a message will appear, on-screen, asking if you're still paying attention. You click, "Yes," and the app continues playing.

One of the things you quickly notice is that, as the day progresses, you get paid less and less for each video you watch, until it stops paying at all. Therefore, it's best to check, from time to time, to make sure it's still crediting. If it's not, simply close it down for the day and then resume tomorrow.

You can also earn on AppTrailers by doing its Daily Quiz. The questions are of variable difficulty but are multiple choice. The quiz doesn't pay hugely but it adds a few more points to your daily total.

The amount of money you can make from AppTrailers can vary wildly. Some days, I make 50-70 pence from it. Other days, I'm lucky to make 10-20. It all depends on how many ads are available, and that depends on such factors as the day of the week, time of year and also where you happen to be.

Still, whatever the inconsistency, it's money for doing nothing and, so, I'd say it's well worth trying.

You can get AppTrailers for both Android and IOS by going to the AppTrailers homepage, via this this link. This isn't a referral link, which means I'll make no money from you using it.

Vivatic. It does a bit of everything.

In my nightmarish quest to investigate online money-making opportunities, I've just signed up with a site called Vivatic. It's far too early for me to pass judgement on it but I can at least described what I've experienced so far.

Vivatic seems to be in some ways comparable to the inevitable Swagbucks, in that it offers a variety of ways to make money.

Like Swagbucks, it offers the chance to earn from signing up for various offers. As I've said in the past, I never bother with such offers, as they hardly ever seem to credit and you're often giving unfamiliar companies too much information for comfort.

Vivatic also acts as a survey aggregator. Most of the surveys it offers are from the usual suspects, like Toluna, Survey Sampling International and Speak Up, with pay rates for their surveys looking to be fairly typical of aggregator sites.

Something that is unusual is that it also offers Populus surveys. I don't think I've ever seen Populus surveys offered by an aggregator, so that's certainly something new.

Having said that, as you can join Populus directly, it's hard to see why you'd got through an aggregator who'll, presumably, get a cut of your earnings and, therefore, I assume, pay you less than if you went direct to the original source.

Vivatic also offers surveys by someone called MVF who I've never heard of. Therefore, I've just attempted a two minute survey with them and duly earned 10 pence for it. I shall look further into MVF to find out what they're about and also whether this offer's repeatable.

You can also make money by doing, "Tasks." As far as I can see, these involve some sort of writing micro-task for an outfit called Figure Eight, who I've never heard of. You have to sign-up with them to complete their offers. I haven't done so yet. I'll look into them later and give my opinion when I'm more informed.

It would appear that, once you've completed a certain number of micro-tasks, you qualify for better writing jobs, with £3 being the maximum potential reward for completing such a job.

The features that Vivatic shares with other sites seem fairly standard and there aren't as many of them as with Swagbucks but its few distinctive features seem to hold at least some potential interest for the determined money-maker. Therefore, if you want to join Vivatic, you can do so by using this referral link, from which I could potentially make a modest sum.

Payment method: PayPal. Minimum payout: £20/$20. Time for payouts to be processed: 1-2 months! My earnings today: 10 pence. My rating: Too early to say. JOIN VIVATIC.