With Stillio, you can "set and forget" capturing web screenshots at any regular interval. You only need to define the first capture time and date and the repeat interval and Stillio takes care of the rest.
When you add or edit a web page in your account, you can select your desired scheduling here:
The frequency capture options that are currently available depend on your subscription plan.
* If you just need one or a few pages to be captured more than once a day, and the Top Shot plan is out of your budget, there is a workaround: You can pick one of the other plans, like the Hot Shot plan with 25 URLs but limited to daily captures. If you add the same URL more than once, but at a different capture time, it practically offers you multiple screenshots per day. You can even have it capture hourly screenshots if you add the same URL 24 times, with 1 hour scheduled in between.