About us

Keryth exists because of a problem I ran into as writer, not as a developer.

My name is Laurent. By profession I’m an engineer. I spent a decade in the automotive industry developing injection moulding processes, taking parts from design concept through to mass production. I now run my own manufacturing business providing 3D printing and injection moulding services. I’ve always worked with precision, tolerances, and systems that have to be right.

I also write fiction. Amateur, enthusiastic, part of a small online community of writers who share drafts, give feedback, and argue about plot holes late into the evening. That writing group is where Keryth started.

When AI writing tools began to proliferate, the conversation in our group kept circling back to the same concern: every time you paste your manuscript into one of these tools, where does it go? The honest answer (buried in terms of service that almost nobody reads) is that it often goes into training data. The very model that might on day generate competent fiction at scale could be doing so partly because writers handled it their unpublished work.

That felt wrong to me. Not in a vague, abstract way but in a concrete, this-is-someone’s-work way. A novel is not a search query. It represents months or years of someone creative effort, often deeply personal, sometimes commercially valuable. It deserves better than to be silently absorbed into a model that the author has no relationship with and no control over.

So I built Keryth to be the tool I actually wanted to use. One that treats your manuscript as yours. One where the AI assists the writer (with structure, with consistency, with finding the threads you dropped three chapters ago) without pretending that “assist” means “replace”. Keryth is not designed to write your novel for you. It’s designed to help you write it better.

How Keryth works

Keryth runs on EU-based infrastructure. Your documents are stored on servers in Europe subject to GDPR, operated by a UK-registered company. the AI provider we use – Mistral AI, a French company – processes queries under a strict data processing agreement that prohibits training on customer data. We are registered with the UK Information Commissioner’s Office.

We don’t use advertising on our website and apps. We don’t sell data. We don’t track you across the web. The business model is simple: you pay a subscription, we provide a service. That’s the whole thing.

We publish a warrant canary, updated monthly and PGP-signed, so you can verify independently that we have not been subject to any undisclosed legal order. We publish our full list of sub-processors so you know exactly which third-party services handle your data. We think that level of transparency should be normal. It isn’t yet.

Who Keryth is for

Writers who take their work seriously. That includes hobbyists working on their first novel, experienced authors with publishing contracts, fan fiction writers who have built communities around their work, and anyone in between. The common thread is that you care about what you’ve written and you’d rather not hand it over to a system you don’t trust.

Keryth is currently in early access. If that sounds like you, we’d be glad to have you onboard. We offer a 50% lifetime discount as a thank you for helping us build a better product.