StoryCodexStoryCodex for Android & iOSRead long stories without losing the thread.
A web novel and ebook reader that remembers characters, places, and plot as you read, and never shows you anything from chapters you haven't reached yet.
See how it works
A princess of Mars
ON THE ARIZONA HILLS
I am a very old man; how old I do not know. Possibly I am a hundred, possibly more; but I cannot tell because I have never aged as other men, nor do I remember any childhood. So far as I can recollect I have always been a man, a man of about thirty.
And because of this conviction I have determined to write down the story of the interesting periods of my life and of my death. I cannot explain the phenomena; I can only set down here in the words of an ordinary soldier.
I spent nearly a year prospecting in company with another Confederate officer, Captain of Richmond.
ON THE ARIZONA HILLS
0:09 / 16:57
The problem
Looking something up shouldn't spoil the ending.
Long series keep raising small memory questions: who is this, which faction is that, why does this place matter? Search a wiki and you get the whole series, twists included. StoryCodex answers from only the chapters you've read.
Long breaks
Return after a month and review arc summaries, recent events, and the active cast before you continue.
Huge casts
Recall aliases, roles, alliances, and appearances for characters who vanished hundreds of chapters ago.
Lore overload
Keep places, factions, items, concepts, magic terms, and mysteries organized inside the book itself.
Private reading
Your library, reading progress, summaries, and Codex entries are designed around local-first storage and processing.
How it works
A Codex that grows only as far as you have read.
As you finish each chapter, StoryCodex updates its summaries, character profiles, places, relationships, and timeline, one step at a time, never ahead of you.
Bring in a book
Import an EPUB or PDF, or paste a web novel URL. Multi-volume series share one Codex.
Analyze the chapter
When you finish a chapter, StoryCodex picks out who appeared, what happened, and what changed.
Update the Codex
Profiles, places, relationships, and recaps grow chapter by chapter instead of dumping a full-series wiki on you.
Recall without spoilers
When a name returns 700 chapters later, you get the context that is safe for your current reading progress.
Inside the app
Everything you need for a thousand-chapter story.
Your library, the reader, the Codex, and the Story Map, exactly as they appear on your phone.
Library
Pick up exactly where you left off
Continue reading in one tap, and import EPUBs, PDFs, or web novels from the same screen.
Book Details
Chapter control before you read
Resume, restart, or jump anywhere in a chapter list thousands of entries long.
Reader
Read with built-in narration
A clean reading view with chapter summaries, Codex shortcuts, and an offline narration player.
Lookup
Tap any name for a quick reminder
A spoiler-safe profile pops up right in the text, so you never have to leave the book.
Codex
A private index of the story
Characters, places, factions, and events, all limited to what you have read so far.
Story Map
See the route your story has taken
Follow the plot from place to place in reading order, without spoiling what comes next.
Features
Built for people reading worlds, not just pages.
StoryCodex is at its best when books are long, casts are huge, and lore matters.
Characters
Spoiler-safe profiles with aliases, current status, and relationships that update as you read.
World Index
Tracks places, factions, items, concepts, mysteries, and magic systems so dense worlds stay searchable.
Timeline
Key events and arc summaries in order, so returning after weeks away takes minutes, not a reread.
Relationship Graph
Turns character, faction, and location links into a visual map you can inspect instead of digging through notes.
Offline narration
Natural-sounding offline voices (Kokoro, Piper, Supertonic) turn any book into an audiobook.
Private AI
The AI runs on your phone by default. Cloud analysis is optional and always your choice.
Who it is for
For fantasy, web novels, progression fiction, and any series that's hard to keep straight.
If a book has noble houses, guilds, cultivation ranks, sprawling maps, or mysteries that pay off 500 chapters later, StoryCodex keeps a private reference that grows with the story.
Free on Android & iOS
Bring your longest series along.
Import an EPUB, PDF, or web novel and let the Codex grow from the chapters you actually read.
From the blog
Guides for readers of very long stories.
How to import web novels, catch up after a hiatus, listen offline, and keep a thousand characters straight.
Features
Discover: 70,000 Free Classic Books, Built Into Your Reader
The new Discover tab puts the Project Gutenberg and Standard Ebooks catalogs inside StoryCodex. Browse genres, search the classics, and add a book to your library in one tap.
Sep 29, 2026 · 5 min read
Guides
An EPUB Reader That Remembers the Story
StoryCodex imports your EPUBs like any ebook reader, then does what file readers cannot: remembers every character, narrates with neural voices, and keeps whole series together.
Sep 29, 2026 · 5 min read
Audiobooks
Your Ebook Library Is Already an Audiobook Library
No credits, no subscriptions, no locked catalog. Neural voices turn the EPUBs you already own into audiobooks that play offline, in the car, and in 31 languages.
Sep 29, 2026 · 5 min read
FAQ
Frequently asked questions
Get in touch
Need help or have feedback?
Send a bug report, a feature idea, or a support request. Every message is read, and reader feedback directly shapes the app.
Start reading
Keep the story clear without leaving the book.
StoryCodex is free on Android and iOS. Import a book and let the Codex grow from the chapters you actually read.
Free download · No account required