FEATURES
Powerful tools.
Private by design.
Everything Keryth does is built around one idea: giving serious writers the AI assistance they deserve, without ever asking them to compromise on privacy, ownership, or creative control.
AVAILABLE AT LAUNCH
What Keryth can do for you today
An AI assistant that has actually read your manuscript
Most AI writing tools give you generic advice. Keryth gives you answers grounded in your actual writing because it searches your own encrypted documents in real time before it responds.
Ask it anything. It knows your characters, your world, your plot. It can spot contradictions, flag pacing issues, and help you develop ideas that are already rooted in your story.
- RAG-powered answers from your down documents.
- Built-in internet search, without leaving Keryth.
- Drafting, editing, brainstorming and feedback in one place.
- All conversations encrypted. Nobody else reads your chats.
Write anywhere. Keryth stays in sync.
The Keryth desktop app runs quietly in the background on Windows, Mac and Linux.
Point it at your writing folders and it silently syncs any changes to your secure workspace. No manual uploads, no version confusion.
Write in Scrivener, Word, LibreOffice, Obsidian, or plain test files. It doesn’t matter. Keryth always has your latest draft ready to work with.
Android and iOS mobile apps are in planning. Follow our public roadmap to stay up to date on their progress.
- Automatic background sync. No need for manual uploads.
- Works with the most common writing apps and file formats.
- Windows, macOS, Linux. All supported at launch.
- Encrypted before transmission. Your files never travel in plaintext.
Encryption that actually means something
Your files are encrypted in transit and stored encrypted on our servers. The only exception is a brief indexing step that powers the AI assistant. Plaintext never outlives that process and never leaves our servers.
What remains is encrypted, unreadable, and used for nothing but your own workspace.
Our staff have no access to your writing or the content of your conversations with Keryth. This is not a policy we could quietly change, it is the how the system is built.
- AES-256 encryption on all files and chats.
- Plaintext deleted immediately after indexing.
- No staff access to your content, ever.
- GDPR compliant. Your data rights fully exercisable.
Tailored to your voice, and your project
Set the tone, persona, and working style of your Keryth assistant once per project and it follows your lead in every session. Your thriller needs a different collaborator than your children’s book. Keryth adapts to both.
Want a ruthless developmental editor? A gentle brainstorming partner? A specialist in historical fiction? You write the instructions. Keryth works the way you work.
- Custom tone and persona instructions per project and/or per chat.
- Persists across sessions. Set once, always applied.
- Switch styles between projects instantly.
- Works in any language your project demands.
Write in your language, or all of them.
Keryth assists in any language your story demands, and switches naturally when you do. The full interface is available in English, French, Spanish, German, and Greek at launch, with more languages on the roadmap.
Multilingual projects, translated editions, and code-switching narratives are all handled without friction. Tell Keryth which language to work in, or simply write and it will follow.
- Full UI translated in 5 languages at launch.
- AI assistant works in any language.
- Multilingual and mixed-languages project supported.
- More languages added based on community feedback.
A note on languages: when early access opens on 6th April the Keryth interface will be in English only. French, Spanish, German, and Greek are actively in development and will be rolled out progressively during the early access period. All will be available before the full v1.0 launch.
WHAT’S COMING NEXT
The roadmap: built with writers, for writers
Image generation
Generate character portraits, scene references, and cover concepts directly from your manuscript. Keryth will use your own writing as the source so the images actually match your story.
Full manuscript agent
Send your entire novel to Keryth for a single-pass structural analysis, continuity check, or developmental edit. No chapter-by-chapter uploads. The whole book in one go.
Built-in editor
A full document editor built into Keryth web interface, so you can write and revise directly in your browser when you’re away from your main machine. No app needed, nothing saved on device.
Secure file sharing
Generate encrypted download links for beta readers, editors, or agents. No email attachments, no Google Drive. Your manuscript travels securely, and you control who receives it.
Team workspaces
Shared projects, style guides, and character libraries for writing teams, agencies, and publishers. Collaborate without compromising privacy. Every member’s work stays encrypted.
Mobile apps
Native apps for Android and iOS so you can brainstorm, chat with your assistant, and review your work from anywhere. Full encryption, same privacy guarantees, always in sync with your workspace.
Ready to write on your own terms?
Early access opens Monday 13th April 2026 — 50% off for the first 200 writers.