Analysis credits show how many pages of your total can be crawled in a month. Let’s say you have added 1 website page and this page is analyzed 4 times a month (PRO and higher plans) automatically both for mobile and pc. In this case, a page uses 8 credits per month. If you want, you can also start manual analysis, in addition to automatic ones.
Each month, the number of your analysis credit is renewed automatically. However, if your analysis credit decreases to 0 within that month, you cannot perform weekly analysis or manual analysis until your credits are renewed –for this, you must upgrade your plan or wait for your analysis right to be renewed.