ChapterAI Free
Free
Get started for free. No payment required.
- Up to 3 stories & 5 branches
- Up to 50 messages per story
- 3 default system prompts
- Chapters & Glossary
Create your own story with AI as your writing companion
Write rich, branching stories with AI that stays grounded in your chapter summaries and glossary terms as your narrative grows. Explore alternate paths, keep long stories organized, and choose from 16 AI providers or local models.
Write longer stories without losing the plot
Automatic chapter summaries keep the story on track
When you create a new chapter, ChapterAI summarizes the previous one and carries that context forward. This keeps the AI focused on the current scene without losing the important events that came before.
Screenshot coming soon
Glossary terms keep characters and world details consistent
On chapter creation, the AI can extract key characters, locations, items, and concepts into your glossary. Those terms are then included in future generations, and you can add or edit entries yourself whenever you need more control.
Screenshot coming soon
Explore alternate story paths with branches
Create branches from any point in your story to try different choices, scenes, or outcomes without rewriting your original path. Keep multiple possibilities alive and switch between them when you want to compare directions.
Screenshot coming soon
Brainstorm without changing the story itself
Use Brainstorm Mode as a separate AI chat for questions, planning, and idea generation. It helps you get unstuck, refine scenes, and explore options before you commit anything to your chapters.
Screenshot coming soon
Choose the AI provider that fits your workflow
ChapterAI works with 16 AI providers, including OpenAI, Anthropic, Gemini, DeepSeek, Groq, and more. Bring your own API keys, switch providers anytime, or connect a local model through an OpenAI-compatible endpoint.
Screenshot coming soon
Simple pricing
One payment. Yours forever.
ChapterAI
$14.99 / one-time
Taxes included in the price.
Buy once, own it forever. Free updates included.
- Unlimited stories, branches & messages
- Custom system prompts
- Google Drive sync
- Export to PDF, EPUB, Markdown
- Free updates
- Personal use license
Payments are processed securely by Polar . 30-day money-back guarantee.
Frequently asked questions
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ChapterAI is currently available on Windows, Linux, and Android. iOS and macOS versions are on the roadmap.
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No. ChapterAI is a one-time purchase. You only pay for your own AI API usage, and updates are included for the lifetime of the major version.
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ChapterAI uses large language models to generate content based on your instructions and your story context. You connect your own API key and choose the AI provider and model you want to use.
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Yes. A free version is available with limited features, including up to 3 stories with 5 branches and 50 messages per story. No account is required.
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If ChapterAI isn't right for you, contact me within 30 days for a full refund — no questions asked.
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Polar (the payment processor) sends your license key to the email address you used at checkout. You can also view it at any time in your Polar customer portal.
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You can activate your license on up to 10 devices. If you need to move to a new device, you can deactivate an old one from the app settings and use that activation again.