Your first continuity check and your first clean file are free
The first chapter you check for continuity and the first file you export without the Inkroost mark now cost nothing, so you can see what both do before you spend a credit.
What shipped. The first time you run Check continuity on a chapter you uploaded, the whole chapter is checked for free, however many pages it has. The first time you export a chapter or a series Without the mark, that file is free too. Both say so before you start: "free, as your first check" and "free, as your first one".
Why it matters. Both tools are easiest to judge once you have seen what they find on your own pages, and in your own file. Now you can try them before deciding whether they are worth credits to you.
How to use it. Open a chapter, go to Do more with this chapter, and pick Check continuity or Export. After the free one, a check costs a credit per page and a clean file costs credits. The Light plan includes 300 checked pages a month and every file without the mark.