A standalone novel fits in your head. A series does not. Kalan Vidhi is for the second kind — the book with a cast of twenty, a magic system with rules you have to keep, and a history that has to still make sense in book three.
Most writers keep a story bible in a word processor, and most story bibles go stale by the middle of the first draft, because updating them is a separate chore from writing. Here the bible is the app: the same records you write against are the ones the canon check reads, so keeping it current is not extra work.
The manuscript editor keeps the characters and places linked to the current chapter in a side panel. You stop breaking flow to go and check what colour someone's eyes were, or which rank they had reached by chapter nine.
The canon check reads your world and flags age mismatches against the story year, events out of chronological order, duplicate names, and references to characters who are already dead. It is read-only — it tells you, it never quietly edits your book.
Epic and secondary-world fantasy, progression fantasy, mythological retellings, and any series with a hard magic system — the kinds of story where the rules matter and readers notice when they break.