Product
Five pieces, one system: a brain that remembers, a voice that's measurably yours, an editor that asks the right questions, formats built natively, and a calendar that plans with reasons.
One system
Before any AI writes a word, a deterministic engine scores your knowledge, resolves conflicts, and assembles the brief. The model only phrases what you actually think — that's why drafts hold up.
How a draft gets built
deterministic · LLM-freeKnowledge
Your records — stories, stances, facts
Understanding
Confidence computed from evidence
Reasoning
Conflicts resolved, losers suppressed
Context
The brief assembled — relevance × trust
LLM
the only callIt only phrases the brief — never picks your ideas
FAQ
A generic AI tool forgets you between sessions and improvises its facts. Zsper keeps a persistent, inspectable knowledge model of your thinking, selects from it before it writes, and shows the provenance of every draft. The prompt is the least interesting part.
The Brain — it's what makes everything else work. Every other page (voice, editor, formats, calendar) is a different way of drawing on the same living knowledge.
The blog covers the architecture — how confidence is computed, how conflicts resolve, and why the intelligence layer is deterministic rather than a black box. Start with "How Zsper works".
More questions? Visit the Help Center →
Bring a few pieces you've already written — the brain does the rest.
30-day free trial · No credit card required