Casto Downloads & RevenueCasto: AI Character Fiction · App Store
Not in any tracked top chart right now.
Updated 5 Nov 2026 · rankings refresh through the day
DeveloperGiyeop Hwang
CategoryBooks
PriceFree
Released
Rating★ 5.0 (2)
Version1.9.0
Age rating12+
First seen by us
12 Oct 2026
12 Oct 2026Casto: AI Character Fiction update history & changes
Last change · 3 events since 6 May 2026Full timeline ↓Full timeline · 3 events
- 🆕Casto: AI Character Fiction first spotted by AppInsiderSouth Korea (found via developer)
- 📦Casto: AI Character Fiction version 1.9.0We have further improved the app's usability and stability.
- You can now create up to 5 free episodes every day.
- Chatting with characters is now also available for free (up to a daily limit) by watching a short ad. - 🆕Casto: AI Character Fiction released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
5.0 ★
2 ratings
Measured
Casto: AI Character Fiction on the App Store
App details
App ID
6762036374
Publisher
Giyeop Hwang
On the store since
May 2026
Under a year
Minimum OS
iOS 15.1+
iPhone 6s and later
Devices
iPhone · iPad
Content rating
12+
Languages
6
EN FR DE JA KO ZH
Size
120 MB
Also listed in
Books, Entertainment
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
2 ratings
Measured
Ratings
2
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
5.0★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% of Books apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About Casto: AI Character Fiction
AI Fiction with Your Own Cast!
Casto is where your imagination becomes fiction. Create the characters who live in your head — every detail, every quirk — then cast them into AI-written novels that unfold one episode at a time.
Casto is an AI fiction app — half story generator, half interactive fiction — that lets you cast original characters into branching, multi-episode novels.
— WHAT YOU CAN DO —
• Cast your own characters.
Design original characters with names, photos, MBTI, occupations, and backstories. Reuse them across an entire universe of stories.
• Generate multi-episode novels.
Sketch a plot in a line. Casto writes a full episodic novel starring your cast — in romance, fantasy, comedy, or thriller.
• Shape the story's direction.
Every chapter ends on a branching choice. Pick the path, and the next episode unfolds from there.
• Build a universe, not just a story.
Every character you make joins your personal casting universe. Cast them into new stories, watch storylines intersect, and grow a world only you could imagine.
— HOW IT WORKS —
1. Create your characters — name, photo, MBTI, occupation, backstory.
2. Cast them as leads in a new story (romance, fantasy, comedy, or thriller).
3. Steer each chapter with a branching choice. Casto writes the next episode around your call.
4. Reuse your cast in future stories. Your universe grows.
— WHAT MAKES CASTO DIFFERENT —
Most AI writing apps forget your characters the moment a story ends. Casto doesn't. Every character lives in your personal casting universe and can return as a lead, a love interest, or a foil across as many novels as you want to write. Less prompt-tweaking, more reading the fiction only your characters could star in.
— WHO IT'S FOR —
For readers who've always wanted to write the fiction they love. For writers who never tire of casting new leads. For anyone who has ever closed a book wondering, "what if my own character had been the lead?"
Casto turns "what if" into "next episode."
Terms of Use: https://spectacled-curler-cda.notion.site/Casto-Terms-of-Service-3557d7acbcce80a29425e28336318611
Privacy Policy: https://spectacled-curler-cda.notion.site/Casto-Privacy-Policy-34d7d7acbcce80c89eb7f12478c1e1d2
Casto is where your imagination becomes fiction. Create the characters who live in your head — every detail, every quirk — then cast them into AI-written novels that unfold one episode at a time.
Casto is an AI fiction app — half story generator, half interactive fiction — that lets you cast original characters into branching, multi-episode novels.
— WHAT YOU CAN DO —
• Cast your own characters.
Design original characters with names, photos, MBTI, occupations, and backstories. Reuse them across an entire universe of stories.
• Generate multi-episode novels.
Sketch a plot in a line. Casto writes a full episodic novel starring your cast — in romance, fantasy, comedy, or thriller.
• Shape the story's direction.
Every chapter ends on a branching choice. Pick the path, and the next episode unfolds from there.
• Build a universe, not just a story.
Every character you make joins your personal casting universe. Cast them into new stories, watch storylines intersect, and grow a world only you could imagine.
— HOW IT WORKS —
1. Create your characters — name, photo, MBTI, occupation, backstory.
2. Cast them as leads in a new story (romance, fantasy, comedy, or thriller).
3. Steer each chapter with a branching choice. Casto writes the next episode around your call.
4. Reuse your cast in future stories. Your universe grows.
— WHAT MAKES CASTO DIFFERENT —
Most AI writing apps forget your characters the moment a story ends. Casto doesn't. Every character lives in your personal casting universe and can return as a lead, a love interest, or a foil across as many novels as you want to write. Less prompt-tweaking, more reading the fiction only your characters could star in.
— WHO IT'S FOR —
For readers who've always wanted to write the fiction they love. For writers who never tire of casting new leads. For anyone who has ever closed a book wondering, "what if my own character had been the lead?"
Casto turns "what if" into "next episode."
Terms of Use: https://spectacled-curler-cda.notion.site/Casto-Terms-of-Service-3557d7acbcce80a29425e28336318611
Privacy Policy: https://spectacled-curler-cda.notion.site/Casto-Privacy-Policy-34d7d7acbcce80c89eb7f12478c1e1d2
Latest updates
1.9.0
We have further improved the app's usability and stability.
- You can now create up to 5 free episodes every day.
- Chatting with characters is now also available for free (up to a daily limit) by watching a short ad.
