Your story. Your voice. Your rules.
Keryth is your AI assistant. Not a ghostwriter, not a replacement, and not a tool that profits from your creativity.
It’s a private, encrypted workspace where serious writers get the support they deserve: faster research, sharper editing, deeper feedback. Your story, told better. By you.
Early access is now open. 50% lifetime discount for the first 200 subscribers.
🞄 End-to-end encrypted | 🞄 GDPR compliant | 🞄 Never used for AI training | 🞄 No data sharing | 🞄 100% ad-free
WHY IS KERYTH DIFFERENT
You protect your home.
Your phone. Your car.
What about your manuscript?
Think about the last time you pasted a chapter into an AI tool and hit send. Where did those words go? Who can read them? Could they end up in a training dataset that teaches another AI to write like you?
Most AI writing tools are built by large technology companies whose business model depends on data: your prompts, your drafts, your characters, your plot twists. The policy privacy is there, somewhere, buried in legalese. But the honest answer is: you don’t really know.
And for a writer — someone who might spend years on a single story, who has unpublished ideas worth protecting, who has a voice that is entirely their own — that should matter.
———
We felt the same way. So instead of accepting it, we built something different.
Keryth was designed from the ground up so that your writing is encrypted before it ever leaves your device. Not as a promise, as a technical fact.
WHY IS KERYTH DIFFERENT
Built on one principle:
your writing belongs to you.
Not to us. Not to our servers. Not to an AI training pipeline. To you, always.
Encrypted at source
Your files are encrypted before they leave your device and stored encrypted on our servers. Indexing for the AI assistant is the only moment plaintext exists on our systems, and it’s deleted the instant it’s done. What remains is encrypted, unreadable – even by our staff – and used for nothing but your own workspace.
🞄 ZERO-KNOWLEDGE ARCHITECTURE
Your data stays yours. Full stop.
We don’t sell your data. We don’t share it. We don’t use your writing, your prompt, your replies to train AI models — not ours, not anybody’s else.
Your story is not our product. You are not the product. Your subscription is.
🞄 NO DATA SHARING – NO AI TRAINING
Built on European values
Keryth is designed and operated to the highest European data protection standards.
Fully GDPR compliant, with real rights you can exercise yourself, directly from your account, without contacting support.
🞄 GDPR COMPLIANT – YOUR RIGHTS, YOUR CONTROL
WHAT KERYTH DOES
Everything a serious writer needs,
nothing they don’t.
Powerful tools that work around your process, not the other way around.
An AI that knows your manuscript
AI CHAT – RAG – INTERNET SEARCH
Ask Keryth anything about your own work.
“Does chapter sever contradict chapter two?” “What colour are Mira’s eyes?” “Is my pacing off in act three?”
Keryth searches your own encrypted documents in real time to give you answers grounded in your actual writing, not generic advice.
Need to research a historical period or a medical condition? Built-in internet search means you never have to leave your workspace.
🞄 Available on Writer & Novelist plans.
Write anywhere. Keryth keeps up.
DESKTOP APP – AUTO-SYNC – WINDOWS, MAX, LINUX
The Keryth desktop app watches your chosen folders and silently syncs any changes to your secure workspace. Write in Scrivener, Word, LibreOffice, or plain text, it doesn’t matter. Keryth always has your latest draft.
No manual uploads. No version confusion. Your AI assistant is always working from the most current version of your story, automatically, securely, and without interrupting your flow.
🞄 Available on Windows, macOS and Linux
Write in your language
MULTILINGUAL AI – 5 INTERFACE LANGUAGES
Keryth assists your writing in any language your story demands, and switches naturally when you do so. The full interface is available in English, French, Spanish, German, and Greek, with more on the roadmap.
Writing a bilingual story? Drafting in one language, revising in another? Keryth follows your lead without missing a beat.
🞄 EN – FR – ES – DE – GR — more coming
Tailored to your voice
TONE CUSTOMISATION – PERSONAL INSTRUCTIONS
Set the tone, persona, and working style of your Keryth assistant once, and it follows your lead in every session.
Need a ruthless developmental editor who pulls no punches? A gentle brainstorming partner for early drafts? A specialist in your genre?
Your write the instructions. Keryth works the way you work.
🞄 Customisable per project – Available on Writer & Novelist plans.
EARLY ACCESS 🞄 NOW OPEN
Be among the first 200.
Half the price. For life..
Subscribe to an annual plan during the early access and lock in 50% off permanently, not just for the first year. Your price never goes up as long as your subscription is active.
Writer plan £6/mo 🞄 Novelist plan £11/mo (on early access annual plans)
Annual or monthly plans available. 14-day money-back guarantee. No ads, ever.
BUILT ON FACTS, NOT PROMISES
Keryth never sells your data, never shares it, and never uses your writing to train AI models.
Not now, not ever. It’s in our terms, and it’s in our values.