Tessence
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One approved version of what your organization knows.

Tessence is where your organization publishes what it knows. You write with Tess, the AI colleague on your computer, or from the tools you already use over MCP. The people responsible approve it, and everyone works from the same signed edition.

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Free: Tess, the Public library and an encrypted backup of your own Tesseras. Choose a plan when you want books of your own.

A library room by a lake at golden hour. An open book stands on a reading stand; folded paper birds read it from the stand, the sill and the table.
Published Delivery method, edition 3 Signed · on the Delivery and Sales reading lists

Ask a question. Get the approved answer, and who approved it.

Without Tessence How long is our delivery time?
  • Four weeks.an old wiki page
  • Six weeks.a chat from March
  • It depends.a file nobody owns
With Tessence How long is our delivery time?

Six weeks from a signed order.

Delivery method · Edition 3 · accepted by Maria Lind, 3 Nov 2026
The same answer for every person and every assistant that reads this edition.

Example.

What you can do

From a design to an app in production, on environments your company approved.

See all examples
Printed app designs beside a laptop where Tess builds the app feature by feature.
Build an app

Design it. Hand it to Tess. Your yes puts it live.

Tess turns your design into a brief you confirm, builds it with tests first, and publishes it where your company allows.

 A row of the organization's books and a paper bird that has left an answer naming its source edition.
An expert from your books

Your experts write it once. Everyone can ask.

A chatbot that answers from the books your editors accepted, and names the edition behind each answer.

 Tess on a laptop, stopped before a step that would write outside the environment.
Follow your policies

Policies Tess works within, not around.

Allowed models, approved environments and what they may never touch. A person approves every release.
What you get

Your knowledge, run like a publisher runs books

Books

One subject per book: your method, your product facts, your rules. Each with its own editors.

Suggested edits

Anyone can suggest a change, and so can agents. Only the people responsible accept it.

Signed editions

Numbered, signed and never changed afterwards. You always know which edition answered.

Reading lists

Each group gets the books it needs, and so do the assistants they use.

How it fits together

Your books live in Tessence. Write them with Tess, or with the tools you already use.

Two ways in, one rule: a person accepts every change, and every edition is signed.

With Tess

The app on your computer

Tess works with you in stages. She creates and updates books with you, and proposes every change with your name on it.

Her record is Tessera, on your computer. Its backup is encrypted in your Tessence account.

Over MCP

From the tools you already use

Claude, your own agents and other tools that speak MCP reach the same books. They act as you, with your rights and nothing more.

ClaudeYour own agentsAny MCP client

Tessence

Where your books live
Delivery methodBook
Delivery timeSuggested with Tess by Anna Berg
Accepted
Framework customersSuggested from Claude over MCP by Erik Lund
Waiting for an editor
Edition 5Published and signed by Maria Holm
Published
Everyone reads edition 5
Your peopleTessClaudeYour own agents

Tessera, the open-source memory under Tess, also works on its own: fully integrated with Pi, and with other tools over MCP. Tessera for developers

A folded paper bird stands beside a note it has left on the table: a suggested edit, waiting for an editor. A pen lies ready.

Agents suggest. People decide.

No agent can accept an edit or publish an edition. A person does, and their name stays on it.

How people stay in charge
A desk by a window in the morning. On the laptop, Tess shows the stages of the work and a decision waiting for you. A clay-coloured notebook lies open beside it.
Tess

The colleague who works from your books

Tess is the AI colleague on each person's computer. She works with you in stages, asks you when something is yours to decide, and writes down what was agreed and approved.

  • Any model, within your organization's policy
  • On macOS, Windows and Linux
  • Proposes what you learn, with your name on it
Download TessMeet Tess
At sunset a library stands on a lake with warm windows. Paper birds fly out from it toward houses along the shore.

Publish once. Everyone works from it.

Reading lists send each edition to the groups that need it. Your people, Tess and the assistants you connect all read the same edition.

Start free. Pay for the people who write.

Tess, the Public library and a backup of your own Tesseras are free. Plans add books of your own, per seat for the people who write, edit and approve. Readers and agents are always free.

See plans

Start with one book.

Pick what your teams ask about most. Choose a plan, invite the people who write and approve, and publish its first edition.

Choose a planDownload Tess

Readers and agents are free.

An open book on a wooden stand: Delivery method, edition 3, signed, with the name of the person who accepted it.