Worldbuilding consistency software reads every book in your series and checks that the world you invented stays the same: magic and technology rules, geography and distances, factions and politics, lore and history. When a later book contradicts an earlier one, it shows you both passages so you can fix the break before a reader finds it.
Most continuity tools stop at the cast: a character's eyes change color, a name is spelled two ways. Those matter, but they are the easy half. The harder half is everything the characters move through, the world itself, and it breaks far more quietly because no single reader holds all of it in their head at once. You do not, either, by the time you are eight books in.
A world establishes facts the moment it puts them on the page. A port city sits on the western coast. A spell needs the target's true name. The empire and the free cities have been at war for a generation. Silver is worth more than gold because the mines flooded. Each of these is a promise, and a series is a long stack of promises that all have to keep agreeing with each other across hundreds of thousands of words. The reader does not memorize them, but they feel it when one breaks, the same way you feel a wrong note without being able to name it.
A reader will forgive a slow chapter. They will not forgive a world that forgets its own rules.
The trouble is structural, not careless. You wrote Book 1's coastline to serve Book 1's plot. By Book 5, a new plot needs that city to be a day's ride inland, and rereading three books to check would cost a week, so the city quietly moves. The break is invisible in the scene where it happens, because the scene is good. It only contradicts a map you drew two books and two years ago, which nobody has open at the moment of writing.
StoryHelm reads your whole series at once, the prose you wrote in its built-in editor and the finished books you imported from elsewhere, and pulls the world out of the text into your Canon: the single, structured source of truth for your characters, places, factions, items, events, and the rules that govern them. Across a multi-book series, that Canon rolls up into your Series Atlas, so a fact established in Book 1 is the same fact being checked in Book 8.
The reading is done by a multi-agent system powered by Claude, not a keyword search. The World Rules agent reads each established mechanic, geographic fact, faction relationship, and limit straight from your prose and records the book and chapter where it became canon. The Coherence Guardian then watches for the moment a later book contradicts one of those facts, a coastal city gone inland, a magic cost that vanished, a faction that flipped sides without a scene to explain it, and links the two passages together: the rule and the break, each pinned to its exact chapter.
Worldbuilding consistency is not one thing. It is a set of dimensions, each of which can drift on its own. StoryHelm reads and checks all of them from your prose.
Here is the shape of a world break, the way it almost never appears to the author who wrote the two scenes months apart. A port city is established on the western coast in Book 1, its harbor central to the chapter:
Read alone, the Book 5 passage is clean and vivid. Read against Book 1, it has picked up the entire city and set it three days inland, deleting the harbor that drove a whole early chapter. A reader who stood on those cliffs with your hero will feel the ground shift even if they cannot place the page. The fix is a decision, not a deletion: either Sarn is a coastal city and Book 5 has to honor the sea, or you meant to move it and the change needs to be on the page. StoryHelm tells you the two passages disagree and pins each to its chapter; you choose which one wins.
StoryHelm is a one-stop workspace: write your series in its built-in Scene Editor or import finished books, and a multi-agent system powered by Claude reads the whole series at once. The World Rules agent reads each world fact, magic and tech rules, geography, factions, lore, into your Canon and Series Atlas and records the chapter where each became canon. The Coherence Guardian then flags the later book that contradicts one and lays both passages side by side, the rule and the break, each pinned to its exact chapter. StoryHelm reads and analyzes; it never drafts lore and never rewrites a word of your world. It tells you the two passages disagree; you decide which one is right.
Everything your world establishes beyond the cast: magic or technology rules, geography and distances, factions and politics, lore and history. Consistency means none of it contradicts an earlier book.
It reads your world facts and rules into your Canon and Series Atlas as you write or import, then the World Rules and Coherence Guardian agents flag where a later book breaks one, a coastal city that moves inland, a magic limit that vanishes, with the passages side by side.
Yes. One Canon spans unlimited books on the Series tier ($59/mo), so a fact set in Book 1 is the same fact checked in Book 8.
No. It reads and organizes the world that exists in your prose and checks it; it never generates lore or writes your story.
Import your series and StoryHelm reads your magic, geography, factions, and lore into one Canon, then flags the later book that contradicts the world you built.
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