
NovelOS
NovelAI
Novelette
Anyword
ChatGPT
Copysmith
Epiphany Publishing Platform
AI novel writing tool with 112,500-word manuscript memory, character consistency checking, AI editing, and print-ready export. The Sudowrite & NovelCrafter alternative with Swiss privacy. 7-day free trial.

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Website, pricing, platforms and company facts side by side.
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| Website | epos-ai.ch | opalstack.com |
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| Company | Startup from Switzerland · 1 - 9 employees · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


EPOS-AI is an AI writing studio built specifically for fiction authors — not marketers, not copywriters, not bloggers. It's designed for people writing novels, series, and long-form fiction. What makes it different: EPOS-AI reads your entire manuscript and keeps it in memory. When you ask for...
No description of Opalstack yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
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Overall verdict
Why this product is good
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing EPOS-AI and Opalstack.
EPOS-AI's answer
EPOS-AI reads and remembers your entire manuscript across sessions. Unlike generic AI writing tools, it understands narrative structure, tracks character consistency across chapters, and gives editorial feedback with full story context — not just on the current paragraph.
EPOS-AI's answer
Most AI writing tools lose context after every session and treat a novel the same as a blog post. EPOS-AI is built exclusively for fiction authors — it reads your entire manuscript, remembers your characters and worldbuilding across sessions, and offers three levels of editorial analysis that check consistency across chapters. It doesn't generate text for you — it makes your writing better. Swiss-hosted, GDPR-compliant, your manuscript never leaves Switzerland.
EPOS-AI's answer
Fiction authors writing novels and series, self-publishing indie authors, traditionally published writers, freelance editors looking for AI-assisted manuscript analysis, copywriters and content writers who need deep text editing beyond grammar, and journalists working on long-form narrative pieces.
EPOS-AI's answer
Built by Marcel Tobien, a published author with 12 books across urban fantasy, children's fiction, cozy romance, and non-fiction. After years of frustration with AI tools designed for marketers, he built the writing studio he wished existed — solo, from scratch, in Weggis, Switzerland.
EPOS-AI's answer
Node.js, PostgreSQL, Claude by Anthropic (primary AI), Gemini and GPT as fallbacks, Stripe for payments, LanguageTool for spell-checking, hosted on Ubuntu with Nginx and PM2.
EPOS-AI's answer
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