The contextual knowledge layer for your AI
Your AI, working from what your organisation actually knows.
Cornerstone turns your documents into cited facts your AI works from, in the editor and the tools you already use. Every answer can be checked, and it tells you when it does not know.
Up to 5 people, nothing charged until day 31. Then £20 per user a month.
See it for your team
Cursor
Claude
Codex
ChatGPT
Gemini
Copilot
Llama+ a model you run yourself
+ many moreNo more reminding your AI of context
It works from your organisation's knowledge every time. Nothing to paste in every morning, nothing to re-explain.
No more hallucinations or drift
Every answer is cited to its source, and when the facts are not there it says so instead of guessing. A superseded fact is dated and set aside, so the answer never drifts from what is true now.
No more having to share out of date sessions
What you and your colleagues decide is recorded once. Every session, whoever runs it, starts from the current record rather than a forwarded transcript.
You can now trust your AI output whilst reducing token usage.
Answers you can check, from around 98% fewer tokens than handing the model whole documents to read.
Who it is for
For you, your team, your organisation.
Which of these sounds like you?
How it works
Three things change on the first day.
01 · Answers you can check
Every answer comes with its source, its author and its date.
Your documents become typed, cited facts. Ask in your own words and the answer traces back to what your organisation actually wrote, so it can be checked in seconds rather than taken on faith.
More about Cornerstone →Rule
EU client data stays in EU regions
- Source
- Data residency policy, §2
- Author
- Legal
- Date
- 12 Mar 2026
- Applies to
- EU clients
Decision
Frankfurt is the default EU region
- Source
- Architecture review, 4 Jun
- Author
- Architecture
- Date
- 4 Jun 2026
- Applies to
- New EU tenants
Superseded Dublin is the default EU region · 2024
Reference
Data residency addendum, §4
- Source
- Contract template v3
- Author
- Commercial
- Date
- 20 Aug 2026
- Applies to
- Client contracts
A question the documents cannot answer
Is there a rule for the new Milan region?
Nothing is recorded for Milan. The EU rule predates that region, so it may still mean Frankfurt only. Legal would need to confirm rather than assume.
On 49 questions our test corpus could not answer, Cornerstone declined 41. Every other method we tested guessed.
02 · It tells you when it does not know
When the facts are not there, it says so.
A search index always has a nearest match, so on a question your documents cannot answer it guesses in the same confident voice. Cornerstone declines instead. That is what makes the rest of its answers worth trusting.
The benchmark, including the eight it got wrong →03 · Decisions stay made
What you decide is recorded once, and every session starts from it.
Settle something in a chat and your assistant offers to record it. Say yes and it becomes a fact the whole team reads from. Work becomes tickets, and the next session, whoever runs it, starts where this one ended.
More about the Coordinator →Milan region: residency rule
Decided
4 Sep 2026 · Legal
Written back to Cornerstone as a rule. Every session since reads it.
Q3 board narrative
In progress
Finance · two people, one AI session open
Reads the Q2 decisions instead of re-deriving them.
Supplier onboarding rules
Decided
28 Aug 2026 · Operations
Three questions the old checklist had left open, now settled once.
The platform
Build a source of truth for your AI to work from.
Your organisation’s knowledge flows into Cornerstone as cited facts. The Coordinator keeps the work and the knowledge in step. Your AI works from both, through Workbench.
Your organisation’s knowledge
Documents
+ many moreMeetings
+ many moreTickets
+ many moreDecisions
+ many morePolicies
+ many more
Instructed Intelligence
The platform
Cornerstone
The knowledge layer
What your organisation knows, held as typed, cited facts. Each one carries its source, its author, its date and what it applies to.
Rule
EU client data stays in EU regions
Legal · 12 Mar 2026
Decision
Frankfurt is the default EU region
Architecture · 4 Jun 2026
Coordinator
Keeps work and knowledge in step
What is being worked on, by whom, and what was decided. Every session starts from what the last one learned.
Q3 board narrative
In progress · Finance
Milan region: residency rule
Decided · 4 Sep 2026
Current facts, with sources
Decisions and outcomes, written back as facts
Workbench
Connect your AI
- Cursor
- Claude
- ChatGPT
- Codex
- Gemini
- Copilot
- Llama
+ many others
If you use multiple LLMs, our Router helps choose which is best for the task.
Turned into cited facts
Cited facts for each question. A clear no, when there are none.
Questions
Work produced. Decisions made.
What is in progress, and by whom. What was already decided.
Your organisation’s knowledge
Documents
+ many moreMeetings
+ many moreTickets
+ many moreDecisions
+ many morePolicies
+ many more
- Turned into cited facts
Instructed Intelligence
The platform
Cornerstone
The knowledge layer
What your organisation knows, held as typed, cited facts. Each one carries its source, its author, its date and what it applies to.
Rule
EU client data stays in EU regions
Legal · 12 Mar 2026
Decision
Frankfurt is the default EU region
Architecture · 4 Jun 2026
- Current facts, with sources
- Decisions and outcomes, written back as facts
Coordinator
Keeps work and knowledge in step
What is being worked on, by whom, and what was decided. Every session starts from what the last one learned.
Q3 board narrative
In progress · Finance
Milan region: residency rule
Decided · 4 Sep 2026
Your AI with Cornerstone
- Cited facts for each question
- A clear no, when there are none
- Questions
Your AI with the Coordinator
- What is in progress, and by whom
- What was already decided
- Work produced
- Decisions made
Workbench
Connect your AI
- Cursor
- Claude
- ChatGPT
- Codex
- Gemini
- Copilot
- Llama
+ many others
If you use multiple LLMs, our Router helps choose which is best for the task.
Proof
Seven methods. Same documents. Same model.
We built every method we could and measured them all the same way on the same 2,201 documents. The numbers are ours, and so are the questions it got wrong.
96.7%
found the right document, against 85% for the best alternative
41 of 49
questions the documents could not answer, declined rather than guessed
98%
fewer tokens than handing the model whole documents to read
Pricing
£20 per user a month. Start with a 30-day trial.
Everything in, per seat, no platform fee, no set-up cost. Up to 5 people for 30 days before anything is charged, and one click to cancel.
Rolling it out across an organisation?
Enterprise is scoped to where you run it.
Your cloud, on-premises or air-gappable, with Habitat included, single sign-on, and a security review your team can approve.
Give your AI something worth working from.
Start a 30-day trial for up to 5 people. Point it at the documents you actually search, and ask it something you already know the answer to.